public static TryCatch <PartitionMapping <PartitionedToken> > MonadicGetPartitionMapping <PartitionedToken>(
IReadOnlyList <FeedRangeEpk> partitionKeyRanges,
IReadOnlyList <PartitionedToken> partitionedContinuationTokens)
where PartitionedToken : IPartitionedToken
{
if (partitionKeyRanges == null)
{
throw new ArgumentNullException(nameof(partitionKeyRanges));
}
if (partitionedContinuationTokens == null)
{
throw new ArgumentNullException(nameof(partitionedContinuationTokens));
}
if (partitionKeyRanges.Count < 1)
{
throw new ArgumentException(nameof(partitionKeyRanges));
}
if (partitionedContinuationTokens.Count < 1)
{
throw new ArgumentException(nameof(partitionKeyRanges));
}
if (partitionedContinuationTokens.Count > partitionKeyRanges.Count)
{
throw new ArgumentException($"{nameof(partitionedContinuationTokens)} can not have more elements than {nameof(partitionKeyRanges)}.");
}
// Find the continuation token for the partition we left off on:
PartitionedToken firstContinuationToken = partitionedContinuationTokens
.OrderBy((partitionedToken) => partitionedToken.Range.Min)
.First();
// Segment the ranges based off that:
ReadOnlyMemory <FeedRangeEpk> sortedRanges = partitionKeyRanges
.OrderBy((partitionKeyRange) => partitionKeyRange.Range.Min)
.ToArray();
FeedRangeEpk firstContinuationRange = new FeedRangeEpk(
new Documents.Routing.Range <string>(
min: firstContinuationToken.Range.Min,
max: firstContinuationToken.Range.Max,
isMinInclusive: true,
isMaxInclusive: false));
int matchedIndex = sortedRanges.Span.BinarySearch(
firstContinuationRange,
Comparer <FeedRangeEpk> .Create((range1, range2) => string.CompareOrdinal(range1.Range.Min, range2.Range.Min)));
if (matchedIndex < 0)
{
if (partitionKeyRanges.Count != 1)
{
return(TryCatch <PartitionMapping <PartitionedToken> > .FromException(
new MalformedContinuationTokenException(
$"{RMResources.InvalidContinuationToken} - Could not find continuation token: {firstContinuationToken}")));
}
// The user is doing a partition key query that got split, so it no longer aligns with our continuation token.
matchedIndex = 0;
}
ReadOnlyMemory <FeedRangeEpk> partitionsLeftOfTarget = matchedIndex == 0 ? ReadOnlyMemory <FeedRangeEpk> .Empty : sortedRanges.Slice(start: 0, length: matchedIndex);
ReadOnlyMemory <FeedRangeEpk> targetPartition = sortedRanges.Slice(start: matchedIndex, length: 1);
ReadOnlyMemory <FeedRangeEpk> partitionsRightOfTarget = matchedIndex == sortedRanges.Length - 1 ? ReadOnlyMemory <FeedRangeEpk> .Empty : sortedRanges.Slice(start: matchedIndex + 1);
// Create the continuation token mapping for each region.
IReadOnlyDictionary <FeedRangeEpk, PartitionedToken> mappingForPartitionsLeftOfTarget = MatchRangesToContinuationTokens(
partitionsLeftOfTarget,
partitionedContinuationTokens);
IReadOnlyDictionary <FeedRangeEpk, PartitionedToken> mappingForTargetPartition = MatchRangesToContinuationTokens(
targetPartition,
partitionedContinuationTokens);
IReadOnlyDictionary <FeedRangeEpk, PartitionedToken> mappingForPartitionsRightOfTarget = MatchRangesToContinuationTokens(
partitionsRightOfTarget,
partitionedContinuationTokens);
return(TryCatch <PartitionMapping <PartitionedToken> > .FromResult(
new PartitionMapping <PartitionedToken>(
partitionsLeftOfTarget : mappingForPartitionsLeftOfTarget,
targetPartition : mappingForTargetPartition,
partitionsRightOfTarget : mappingForPartitionsRightOfTarget)));
}
/// <summary>
/// Initializes cross partition query execution context by initializing the necessary document producers.
/// </summary>
/// <param name="collectionRid">The collection to drain from.</param>
/// <param name="partitionKeyRanges">The partitions to target.</param>
/// <param name="initialPageSize">The page size to start the document producers off with.</param>
/// <param name="querySpecForInit">The query specification for the rewritten query.</param>
/// <param name="targetRangeToContinuationMap">Map from partition to it's corresponding continuation token.</param>
/// <param name="deferFirstPage">Whether or not we should defer the fetch of the first page from each partition.</param>
/// <param name="filter">The filter to inject in the predicate.</param>
/// <param name="tryFilterAsync">The callback used to filter each partition.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>A task to await on.</returns>
protected async Task <TryCatch> TryInitializeAsync(
string collectionRid,
IReadOnlyList <PartitionKeyRange> partitionKeyRanges,
int initialPageSize,
SqlQuerySpec querySpecForInit,
IReadOnlyDictionary <string, string> targetRangeToContinuationMap,
bool deferFirstPage,
string filter,
Func <ItemProducerTree, Task <TryCatch> > tryFilterAsync,
CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
List <ItemProducerTree> itemProducerTrees = new List <ItemProducerTree>();
foreach (PartitionKeyRange partitionKeyRange in partitionKeyRanges)
{
string initialContinuationToken;
if (targetRangeToContinuationMap != null)
{
if (!targetRangeToContinuationMap.TryGetValue(partitionKeyRange.Id, out initialContinuationToken))
{
initialContinuationToken = null;
}
}
else
{
initialContinuationToken = null;
}
ItemProducerTree itemProducerTree = new ItemProducerTree(
this.queryContext,
querySpecForInit,
partitionKeyRange,
this.OnItemProducerTreeCompleteFetching,
this.itemProducerForest.Comparer as IComparer <ItemProducerTree>,
this.equalityComparer,
this.testSettings,
deferFirstPage,
collectionRid,
initialPageSize,
initialContinuationToken)
{
Filter = filter
};
// Prefetch if necessary, and populate consume queue.
if (this.CanPrefetch)
{
this.TryScheduleFetch(itemProducerTree);
}
itemProducerTrees.Add(itemProducerTree);
}
// Using loop fission so that we can load the document producers in parallel
foreach (ItemProducerTree itemProducerTree in itemProducerTrees)
{
if (!deferFirstPage)
{
while (true)
{
(bool movedToNextPage, QueryResponseCore? failureResponse) = await itemProducerTree.TryMoveNextPageAsync(cancellationToken);
if (failureResponse.HasValue)
{
return(TryCatch.FromException(
new CosmosException(
statusCode: failureResponse.Value.StatusCode,
subStatusCode: (int)failureResponse.Value.SubStatusCode.GetValueOrDefault(0),
message: failureResponse.Value.ErrorMessage,
activityId: failureResponse.Value.ActivityId,
requestCharge: failureResponse.Value.RequestCharge)));
}
if (!movedToNextPage)
{
break;
}
if (itemProducerTree.IsAtBeginningOfPage)
{
break;
}
if (itemProducerTree.TryMoveNextDocumentWithinPage())
{
break;
}
}
}
if (tryFilterAsync != null)
{
TryCatch tryFilter = await tryFilterAsync(itemProducerTree);
if (!tryFilter.Succeeded)
{
return(tryFilter);
}
}
this.itemProducerForest.Enqueue(itemProducerTree);
}
return(TryCatch.FromResult());
}
public static TryCatch <ChangeFeedState> MonadicFromCosmosElement(CosmosElement cosmosElement)
{
if (cosmosElement == null)
{
throw new ArgumentNullException(nameof(cosmosElement));
}
if (!(cosmosElement is CosmosObject cosmosObject))
{
return(TryCatch <ChangeFeedState> .FromException(
new FormatException(
$"expected change feed state to be an object: {cosmosElement}")));
}
if (!cosmosObject.TryGetValue(TypePropertyName, out CosmosString typePropertyValue))
{
return(TryCatch <ChangeFeedState> .FromException(
new FormatException(
$"expected change feed state to have a string type property: {cosmosElement}")));
}
ChangeFeedState state;
switch (typePropertyValue.Value)
{
case BeginningTypeValue:
state = ChangeFeedState.Beginning();
break;
case TimeTypeValue:
{
if (!cosmosObject.TryGetValue(ValuePropertyName, out CosmosString valuePropertyValue))
{
return(TryCatch <ChangeFeedState> .FromException(
new FormatException(
$"expected change feed state to have a string value property: {cosmosElement}")));
}
if (!DateTime.TryParse(
valuePropertyValue.Value,
CultureInfo.InvariantCulture,
DateTimeStyles.AssumeUniversal | DateTimeStyles.AdjustToUniversal | DateTimeStyles.AllowWhiteSpaces,
out DateTime utcStartTime))
{
return(TryCatch <ChangeFeedState> .FromException(
new FormatException(
$"failed to parse start time value: {cosmosElement}")));
}
state = ChangeFeedState.Time(utcStartTime);
}
break;
case ContinuationTypeValue:
{
if (!cosmosObject.TryGetValue(ValuePropertyName, out CosmosString valuePropertyValue))
{
return(TryCatch <ChangeFeedState> .FromException(
new FormatException(
$"expected change feed state to have a string value property: {cosmosElement}")));
}
state = ChangeFeedState.Continuation(valuePropertyValue);
}
break;
case NowTypeValue:
state = ChangeFeedState.Now();
break;
default:
throw new InvalidOperationException();
}
return(TryCatch <ChangeFeedState> .FromResult(state));
}
protected async Task <TryCatch> TryInitializeAsync(
string collectionRid,
int initialPageSize,
SqlQuerySpec querySpecForInit,
IReadOnlyDictionary <PartitionKeyRange, string> targetRangeToContinuationMap,
bool deferFirstPage,
string filter,
Func <ItemProducerTree, Task <TryCatch> > tryFilterAsync,
CancellationToken cancellationToken)
{
if (collectionRid == null)
{
throw new ArgumentNullException(nameof(collectionRid));
}
if (initialPageSize < 0)
{
throw new ArgumentOutOfRangeException(nameof(initialPageSize));
}
if (querySpecForInit == null)
{
throw new ArgumentNullException(nameof(querySpecForInit));
}
if (targetRangeToContinuationMap == null)
{
throw new ArgumentNullException(nameof(targetRangeToContinuationMap));
}
cancellationToken.ThrowIfCancellationRequested();
List <ItemProducerTree> itemProducerTrees = new List <ItemProducerTree>();
foreach (KeyValuePair <PartitionKeyRange, string> rangeAndContinuationToken in targetRangeToContinuationMap)
{
PartitionKeyRange partitionKeyRange = rangeAndContinuationToken.Key;
string continuationToken = rangeAndContinuationToken.Value;
ItemProducerTree itemProducerTree = new ItemProducerTree(
this.queryContext,
querySpecForInit,
partitionKeyRange,
this.OnItemProducerTreeCompleteFetching,
this.itemProducerForest.Comparer as IComparer <ItemProducerTree>,
this.equalityComparer,
this.testSettings,
deferFirstPage,
collectionRid,
initialPageSize,
continuationToken)
{
Filter = filter
};
// Prefetch if necessary, and populate consume queue.
if (this.CanPrefetch)
{
this.TryScheduleFetch(itemProducerTree);
}
itemProducerTrees.Add(itemProducerTree);
}
// Using loop fission so that we can load the document producers in parallel
foreach (ItemProducerTree itemProducerTree in itemProducerTrees)
{
if (!deferFirstPage)
{
while (true)
{
(bool movedToNextPage, QueryResponseCore? failureResponse) = await itemProducerTree.TryMoveNextPageAsync(cancellationToken);
if (failureResponse.HasValue)
{
return(TryCatch.FromException(
failureResponse.Value.CosmosException));
}
if (!movedToNextPage)
{
break;
}
if (itemProducerTree.IsAtBeginningOfPage)
{
break;
}
if (itemProducerTree.TryMoveNextDocumentWithinPage())
{
break;
}
}
}
if (tryFilterAsync != null)
{
TryCatch tryFilter = await tryFilterAsync(itemProducerTree);
if (!tryFilter.Succeeded)
{
return(tryFilter);
}
}
this.itemProducerForest.Enqueue(itemProducerTree);
}
return(TryCatch.FromResult());
}
public override async ValueTask <bool> MoveNextAsync(ITrace trace)
{
this.cancellationToken.ThrowIfCancellationRequested();
if (trace == null)
{
throw new ArgumentNullException(nameof(trace));
}
if (this.returnedLastPage)
{
this.Current = default;
return(false);
}
// Draining GROUP BY is broken down into two stages:
double requestCharge = 0.0;
long responseLengthInBytes = 0;
while (await this.inputStage.MoveNextAsync(trace))
{
this.cancellationToken.ThrowIfCancellationRequested();
// Stage 1:
// Drain the groupings fully from all continuation and all partitions
TryCatch <QueryPage> tryGetSourcePage = this.inputStage.Current;
if (tryGetSourcePage.Failed)
{
this.Current = tryGetSourcePage;
return(true);
}
QueryPage sourcePage = tryGetSourcePage.Result;
requestCharge += sourcePage.RequestCharge;
responseLengthInBytes += sourcePage.ResponseLengthInBytes;
this.AggregateGroupings(sourcePage.Documents);
}
// Stage 2:
// Emit the results from the grouping table page by page
IReadOnlyList <CosmosElement> results = this.groupingTable.Drain(this.pageSize);
if (this.groupingTable.Count == 0)
{
this.returnedLastPage = true;
}
QueryPage queryPage = new QueryPage(
documents: results,
requestCharge: requestCharge,
activityId: null,
responseLengthInBytes: responseLengthInBytes,
cosmosQueryExecutionInfo: null,
disallowContinuationTokenMessage: ClientGroupByQueryPipelineStage.ContinuationTokenNotSupportedWithGroupBy,
state: null);
this.Current = TryCatch <QueryPage> .FromResult(queryPage);
return(true);
}
// In order to maintain the continuation token for the user we must drain with a few constraints
// 1) We fully drain from the left most partition before moving on to the next partition
// 2) We drain only full pages from the document producer so we aren't left with a partial page
// otherwise we would need to add to the continuation token how many items to skip over on that page.
public async ValueTask <bool> MoveNextAsync(ITrace trace)
{
if (trace == null)
{
throw new ArgumentNullException(nameof(trace));
}
if (!await this.crossPartitionRangePageAsyncEnumerator.MoveNextAsync(trace))
{
this.Current = default;
return(false);
}
TryCatch <CrossFeedRangePage <QueryPage, QueryState> > currentCrossPartitionPage = this.crossPartitionRangePageAsyncEnumerator.Current;
if (currentCrossPartitionPage.Failed)
{
this.Current = TryCatch <QueryPage> .FromException(currentCrossPartitionPage.Exception);
return(true);
}
CrossFeedRangePage <QueryPage, QueryState> crossPartitionPageResult = currentCrossPartitionPage.Result;
QueryPage backendQueryPage = crossPartitionPageResult.Page;
CrossFeedRangeState <QueryState> crossPartitionState = crossPartitionPageResult.State;
QueryState queryState;
if (crossPartitionState == null)
{
queryState = null;
}
else
{
// left most and any non null continuations
IOrderedEnumerable <FeedRangeState <QueryState> > feedRangeStates = crossPartitionState
.Value
.ToArray()
.OrderBy(tuple => ((FeedRangeEpk)tuple.FeedRange).Range.Min);
List <ParallelContinuationToken> activeParallelContinuationTokens = new List <ParallelContinuationToken>();
{
FeedRangeState <QueryState> firstState = feedRangeStates.First();
ParallelContinuationToken firstParallelContinuationToken = new ParallelContinuationToken(
token: firstState.State != null ? ((CosmosString)firstState.State.Value).Value : null,
range: ((FeedRangeEpk)firstState.FeedRange).Range);
activeParallelContinuationTokens.Add(firstParallelContinuationToken);
}
foreach (FeedRangeState <QueryState> feedRangeState in feedRangeStates.Skip(1))
{
this.cancellationToken.ThrowIfCancellationRequested();
if (feedRangeState.State != null)
{
ParallelContinuationToken parallelContinuationToken = new ParallelContinuationToken(
token: feedRangeState.State != null ? ((CosmosString)feedRangeState.State.Value).Value : null,
range: ((FeedRangeEpk)feedRangeState.FeedRange).Range);
activeParallelContinuationTokens.Add(parallelContinuationToken);
}
}
IEnumerable <CosmosElement> cosmosElementContinuationTokens = activeParallelContinuationTokens
.Select(token => ParallelContinuationToken.ToCosmosElement(token));
CosmosArray cosmosElementParallelContinuationTokens = CosmosArray.Create(cosmosElementContinuationTokens);
queryState = new QueryState(cosmosElementParallelContinuationTokens);
}
QueryPage crossPartitionQueryPage = new QueryPage(
backendQueryPage.Documents,
backendQueryPage.RequestCharge,
backendQueryPage.ActivityId,
backendQueryPage.ResponseLengthInBytes,
backendQueryPage.CosmosQueryExecutionInfo,
backendQueryPage.DisallowContinuationTokenMessage,
backendQueryPage.AdditionalHeaders,
queryState);
this.Current = TryCatch <QueryPage> .FromResult(crossPartitionQueryPage);
return(true);
}
private static Task <TryCatch <IDocumentQueryExecutionComponent> > CreateSource(CosmosElement continuationToken)
{
return(Task.FromResult(TryCatch <IDocumentQueryExecutionComponent> .FromResult(new Mock <IDocumentQueryExecutionComponent>().Object)));
}
public static TryCatch <DistinctMap> TryCreate(CosmosElement continuationToken)
{
HashSet <Number64> numbers = new HashSet <Number64>();
HashSet <uint> stringsLength4 = new HashSet <uint>();
HashSet <ulong> stringsLength8 = new HashSet <ulong>();
HashSet <UInt128> stringsLength16 = new HashSet <UInt128>();
HashSet <UInt128> stringsLength16Plus = new HashSet <UInt128>();
HashSet <UInt128> arrays = new HashSet <UInt128>();
HashSet <UInt128> objects = new HashSet <UInt128>();
SimpleValues simpleValues = SimpleValues.None;
if (continuationToken != null)
{
if (!(continuationToken is CosmosObject hashDictionary))
{
return(TryCatch <DistinctMap> .FromException(
new MalformedContinuationTokenException(
$"{nameof(UnorderdDistinctMap)} continuation token was malformed.")));
}
// Numbers
if (!hashDictionary.TryGetValue(UnorderdDistinctMap.PropertyNames.Numbers, out CosmosArray numbersArray))
{
return(TryCatch <DistinctMap> .FromException(
new MalformedContinuationTokenException(
$"{nameof(UnorderdDistinctMap)} continuation token was malformed.")));
}
foreach (CosmosElement rawNumber in numbersArray)
{
if (!(rawNumber is CosmosNumber64 number))
{
return(TryCatch <DistinctMap> .FromException(
new MalformedContinuationTokenException(
$"{nameof(UnorderdDistinctMap)} continuation token was malformed.")));
}
numbers.Add(number.GetValue());
}
// Strings Length 4
if (!hashDictionary.TryGetValue(UnorderdDistinctMap.PropertyNames.StringsLength4, out CosmosArray stringsLength4Array))
{
return(TryCatch <DistinctMap> .FromException(
new MalformedContinuationTokenException(
$"{nameof(UnorderdDistinctMap)} continuation token was malformed.")));
}
foreach (CosmosElement rawStringLength4 in stringsLength4Array)
{
if (!(rawStringLength4 is CosmosUInt32 stringlength4))
{
return(TryCatch <DistinctMap> .FromException(
new MalformedContinuationTokenException(
$"{nameof(UnorderdDistinctMap)} continuation token was malformed.")));
}
stringsLength4.Add(stringlength4.GetValue());
}
// Strings Length 8
if (!hashDictionary.TryGetValue(UnorderdDistinctMap.PropertyNames.StringsLength8, out CosmosArray stringsLength8Array))
{
return(TryCatch <DistinctMap> .FromException(
new MalformedContinuationTokenException(
$"{nameof(UnorderdDistinctMap)} continuation token was malformed.")));
}
foreach (CosmosElement rawStringLength8 in stringsLength8Array)
{
if (!(rawStringLength8 is CosmosInt64 stringlength8))
{
return(TryCatch <DistinctMap> .FromException(
new MalformedContinuationTokenException(
$"{nameof(UnorderdDistinctMap)} continuation token was malformed.")));
}
stringsLength8.Add((ulong)stringlength8.GetValue());
}
// Strings Length 16
stringsLength16 = Parse128BitHashes(hashDictionary, UnorderdDistinctMap.PropertyNames.StringsLength16);
// Strings Length 24
stringsLength16Plus = Parse128BitHashes(hashDictionary, UnorderdDistinctMap.PropertyNames.StringsLength16Plus);
// Array
arrays = Parse128BitHashes(hashDictionary, UnorderdDistinctMap.PropertyNames.Arrays);
// Object
objects = Parse128BitHashes(hashDictionary, UnorderdDistinctMap.PropertyNames.Object);
// Simple Values
CosmosElement rawSimpleValues = hashDictionary[UnorderdDistinctMap.PropertyNames.SimpleValues];
if (!(rawSimpleValues is CosmosString simpleValuesString))
{
return(TryCatch <DistinctMap> .FromException(
new MalformedContinuationTokenException(
$"{nameof(UnorderdDistinctMap)} continuation token was malformed.")));
}
if (!Enum.TryParse <SimpleValues>(simpleValuesString.Value, out simpleValues))
{
return(TryCatch <DistinctMap> .FromException(
new MalformedContinuationTokenException(
$"{nameof(UnorderdDistinctMap)} continuation token was malformed.")));
}
}
return(TryCatch <DistinctMap> .FromResult(new UnorderdDistinctMap(
numbers,
stringsLength4,
stringsLength8,
stringsLength16,
stringsLength16Plus,
arrays,
objects,
simpleValues)));
}
public ChangeFeedIteratorCore(
IDocumentContainer documentContainer,
ChangeFeedRequestOptions changeFeedRequestOptions,
ChangeFeedStartFrom changeFeedStartFrom)
{
if (changeFeedStartFrom == null)
{
throw new ArgumentNullException(nameof(changeFeedStartFrom));
}
this.documentContainer = documentContainer ?? throw new ArgumentNullException(nameof(documentContainer));
this.changeFeedRequestOptions = changeFeedRequestOptions ?? new ChangeFeedRequestOptions();
this.lazyMonadicEnumerator = new AsyncLazy <TryCatch <CrossPartitionChangeFeedAsyncEnumerator> >(
valueFactory: async(cancellationToken) =>
{
if (changeFeedStartFrom is ChangeFeedStartFromContinuation startFromContinuation)
{
TryCatch <CosmosElement> monadicParsedToken = CosmosElement.Monadic.Parse(startFromContinuation.Continuation);
if (monadicParsedToken.Failed)
{
return(TryCatch <CrossPartitionChangeFeedAsyncEnumerator> .FromException(
new MalformedChangeFeedContinuationTokenException(
message: $"Failed to parse continuation token: {startFromContinuation.Continuation}.",
innerException: monadicParsedToken.Exception)));
}
TryCatch <VersionedAndRidCheckedCompositeToken> monadicVersionedToken = VersionedAndRidCheckedCompositeToken
.MonadicCreateFromCosmosElement(monadicParsedToken.Result);
if (monadicVersionedToken.Failed)
{
return(TryCatch <CrossPartitionChangeFeedAsyncEnumerator> .FromException(
new MalformedChangeFeedContinuationTokenException(
message: $"Failed to parse continuation token: {startFromContinuation.Continuation}.",
innerException: monadicVersionedToken.Exception)));
}
VersionedAndRidCheckedCompositeToken versionedAndRidCheckedCompositeToken = monadicVersionedToken.Result;
if (versionedAndRidCheckedCompositeToken.VersionNumber == VersionedAndRidCheckedCompositeToken.Version.V1)
{
// Need to migrate continuation token
if (!(versionedAndRidCheckedCompositeToken.ContinuationToken is CosmosArray cosmosArray))
{
return(TryCatch <CrossPartitionChangeFeedAsyncEnumerator> .FromException(
new MalformedChangeFeedContinuationTokenException(
message: $"Failed to parse get array continuation token: {startFromContinuation.Continuation}.")));
}
List <CosmosElement> changeFeedTokensV2 = new List <CosmosElement>();
foreach (CosmosElement arrayItem in cosmosArray)
{
if (!(arrayItem is CosmosObject cosmosObject))
{
return(TryCatch <CrossPartitionChangeFeedAsyncEnumerator> .FromException(
new MalformedChangeFeedContinuationTokenException(
message: $"Failed to parse get object in composite continuation: {startFromContinuation.Continuation}.")));
}
if (!cosmosObject.TryGetValue("min", out CosmosString min))
{
return(TryCatch <CrossPartitionChangeFeedAsyncEnumerator> .FromException(
new MalformedChangeFeedContinuationTokenException(
message: $"Failed to parse start of range: {cosmosObject}.")));
}
if (!cosmosObject.TryGetValue("max", out CosmosString max))
{
return(TryCatch <CrossPartitionChangeFeedAsyncEnumerator> .FromException(
new MalformedChangeFeedContinuationTokenException(
message: $"Failed to parse end of range: {cosmosObject}.")));
}
if (!cosmosObject.TryGetValue("token", out CosmosElement token))
{
return(TryCatch <CrossPartitionChangeFeedAsyncEnumerator> .FromException(
new MalformedChangeFeedContinuationTokenException(
message: $"Failed to parse token: {cosmosObject}.")));
}
FeedRangeEpk feedRangeEpk = new FeedRangeEpk(new Documents.Routing.Range <string>(
min: min.Value,
max: max.Value,
isMinInclusive: true,
isMaxInclusive: false));
ChangeFeedState state = token is CosmosNull ? ChangeFeedState.Beginning() : ChangeFeedStateContinuation.Continuation(token);
FeedRangeState <ChangeFeedState> feedRangeState = new FeedRangeState <ChangeFeedState>(feedRangeEpk, state);
changeFeedTokensV2.Add(ChangeFeedFeedRangeStateSerializer.ToCosmosElement(feedRangeState));
}
CosmosArray changeFeedTokensArrayV2 = CosmosArray.Create(changeFeedTokensV2);
versionedAndRidCheckedCompositeToken = new VersionedAndRidCheckedCompositeToken(
VersionedAndRidCheckedCompositeToken.Version.V2,
changeFeedTokensArrayV2,
versionedAndRidCheckedCompositeToken.Rid);
}
if (versionedAndRidCheckedCompositeToken.VersionNumber != VersionedAndRidCheckedCompositeToken.Version.V2)
{
return(TryCatch <CrossPartitionChangeFeedAsyncEnumerator> .FromException(
new MalformedChangeFeedContinuationTokenException(
message: $"Wrong version number: {versionedAndRidCheckedCompositeToken.VersionNumber}.")));
}
string collectionRid = await documentContainer.GetResourceIdentifierAsync(cancellationToken);
if (versionedAndRidCheckedCompositeToken.Rid != collectionRid)
{
return(TryCatch <CrossPartitionChangeFeedAsyncEnumerator> .FromException(
new MalformedChangeFeedContinuationTokenException(
message: $"rids mismatched. Expected: {collectionRid} but got {versionedAndRidCheckedCompositeToken.Rid}.")));
}
changeFeedStartFrom = ChangeFeedStartFrom.ContinuationToken(versionedAndRidCheckedCompositeToken.ContinuationToken.ToString());
}
TryCatch <ChangeFeedCrossFeedRangeState> monadicChangeFeedCrossFeedRangeState = changeFeedStartFrom.Accept(ChangeFeedStateFromToChangeFeedCrossFeedRangeState.Singleton);
if (monadicChangeFeedCrossFeedRangeState.Failed)
{
return(TryCatch <CrossPartitionChangeFeedAsyncEnumerator> .FromException(
new MalformedChangeFeedContinuationTokenException(
message: $"Could not convert to {nameof(ChangeFeedCrossFeedRangeState)}.",
innerException: monadicChangeFeedCrossFeedRangeState.Exception)));
}
CrossPartitionChangeFeedAsyncEnumerator enumerator = CrossPartitionChangeFeedAsyncEnumerator.Create(
documentContainer,
changeFeedRequestOptions,
new CrossFeedRangeState <ChangeFeedState>(monadicChangeFeedCrossFeedRangeState.Result.FeedRangeStates),
cancellationToken: default);
TryCatch <CrossPartitionChangeFeedAsyncEnumerator> monadicEnumerator = TryCatch <CrossPartitionChangeFeedAsyncEnumerator> .FromResult(enumerator);
return(monadicEnumerator);
});
this.hasMoreResults = true;
}
// In order to maintain the continuation token for the user we must drain with a few constraints
// 1) We fully drain from the left most partition before moving on to the next partition
// 2) We drain only full pages from the document producer so we aren't left with a partial page
// otherwise we would need to add to the continuation token how many items to skip over on that page.
public async ValueTask <bool> MoveNextAsync()
{
this.cancellationToken.ThrowIfCancellationRequested();
if (!await this.crossPartitionRangePageAsyncEnumerator.MoveNextAsync())
{
this.Current = default;
return(false);
}
TryCatch <CrossPartitionPage <QueryPage, QueryState> > currentCrossPartitionPage = this.crossPartitionRangePageAsyncEnumerator.Current;
if (currentCrossPartitionPage.Failed)
{
this.Current = TryCatch <QueryPage> .FromException(currentCrossPartitionPage.Exception);
return(true);
}
CrossPartitionPage <QueryPage, QueryState> crossPartitionPageResult = currentCrossPartitionPage.Result;
QueryPage backendQueryPage = crossPartitionPageResult.Page;
CrossPartitionState <QueryState> crossPartitionState = crossPartitionPageResult.State;
QueryState queryState;
if (crossPartitionState == null)
{
queryState = null;
}
else
{
// Left most and any non null continuations
List <(PartitionKeyRange, QueryState)> rangesAndStates = crossPartitionState.Value.OrderBy(tuple => tuple.Item1, PartitionKeyRangeComparer.Singleton).ToList();
List <ParallelContinuationToken> activeParallelContinuationTokens = new List <ParallelContinuationToken>();
for (int i = 0; i < rangesAndStates.Count; i++)
{
this.cancellationToken.ThrowIfCancellationRequested();
(PartitionKeyRange range, QueryState state) = rangesAndStates[i];
if ((i == 0) || (state != null))
{
ParallelContinuationToken parallelContinuationToken = new ParallelContinuationToken(
token: state != null ? ((CosmosString)state.Value).Value : null,
range: range.ToRange());
activeParallelContinuationTokens.Add(parallelContinuationToken);
}
}
IEnumerable <CosmosElement> cosmosElementContinuationTokens = activeParallelContinuationTokens
.Select(token => ParallelContinuationToken.ToCosmosElement(token));
CosmosArray cosmosElementParallelContinuationTokens = CosmosArray.Create(cosmosElementContinuationTokens);
queryState = new QueryState(cosmosElementParallelContinuationTokens);
}
QueryPage crossPartitionQueryPage = new QueryPage(
backendQueryPage.Documents,
backendQueryPage.RequestCharge,
backendQueryPage.ActivityId,
backendQueryPage.ResponseLengthInBytes,
backendQueryPage.CosmosQueryExecutionInfo,
backendQueryPage.DisallowContinuationTokenMessage,
queryState);
this.Current = TryCatch <QueryPage> .FromResult(crossPartitionQueryPage);
return(true);
}
/// <summary>
/// Initializes cross partition query execution context by initializing the necessary document producers.
/// </summary>
/// <param name="collectionRid">The collection to drain from.</param>
/// <param name="partitionKeyRanges">The partitions to target.</param>
/// <param name="initialPageSize">The page size to start the document producers off with.</param>
/// <param name="querySpecForInit">The query specification for the rewritten query.</param>
/// <param name="targetRangeToContinuationMap">Map from partition to it's corresponding continuation token.</param>
/// <param name="deferFirstPage">Whether or not we should defer the fetch of the first page from each partition.</param>
/// <param name="filter">The filter to inject in the predicate.</param>
/// <param name="tryFilterAsync">The callback used to filter each partition.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>A task to await on.</returns>
protected async Task<TryCatch<bool>> TryInitializeAsync(
string collectionRid,
IReadOnlyList<PartitionKeyRange> partitionKeyRanges,
int initialPageSize,
SqlQuerySpec querySpecForInit,
IReadOnlyDictionary<string, string> targetRangeToContinuationMap,
bool deferFirstPage,
string filter,
Func<ItemProducerTree, Task<TryCatch<bool>>> tryFilterAsync,
CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
List<ItemProducerTree> itemProducerTrees = new List<ItemProducerTree>();
foreach (PartitionKeyRange partitionKeyRange in partitionKeyRanges)
{
string initialContinuationToken;
if (targetRangeToContinuationMap != null)
{
if (!targetRangeToContinuationMap.TryGetValue(partitionKeyRange.Id, out initialContinuationToken))
{
initialContinuationToken = null;
}
}
else
{
initialContinuationToken = null;
}
ItemProducerTree itemProducerTree = new ItemProducerTree(
this.queryContext,
querySpecForInit,
partitionKeyRange,
this.OnItemProducerTreeCompleteFetching,
this.itemProducerForest.Comparer as IComparer<ItemProducerTree>,
this.equalityComparer,
deferFirstPage,
collectionRid,
initialPageSize,
initialContinuationToken)
{
Filter = filter
};
// Prefetch if necessary, and populate consume queue.
if (this.CanPrefetch)
{
this.TryScheduleFetch(itemProducerTree);
}
itemProducerTrees.Add(itemProducerTree);
}
// Using loop fission so that we can load the document producers in parallel
foreach (ItemProducerTree itemProducerTree in itemProducerTrees)
{
if (!deferFirstPage)
{
(bool successfullyMovedNext, QueryResponseCore? failureResponse) = await itemProducerTree.MoveNextIfNotSplitAsync(cancellationToken);
if (failureResponse != null)
{
// Set the failure so on drain it can be returned.
this.FailureResponse = failureResponse;
// No reason to enqueue the rest of the itemProducerTrees since there is a failure.
break;
}
}
if (tryFilterAsync != null)
{
TryCatch<bool> tryFilter = await tryFilterAsync(itemProducerTree);
if (!tryFilter.Succeeded)
{
return tryFilter;
}
}
if (itemProducerTree.HasMoreResults)
{
this.itemProducerForest.Enqueue(itemProducerTree);
}
}
return TryCatch<bool>.FromResult(true);
}
public override async ValueTask <bool> MoveNextAsync(ITrace trace)
{
if (trace == null)
{
throw new ArgumentNullException(nameof(trace));
}
if (!await this.inputStage.MoveNextAsync(trace))
{
this.Current = default;
return(false);
}
TryCatch <QueryPage> tryGetSourcePage = this.inputStage.Current;
if (tryGetSourcePage.Failed)
{
this.Current = tryGetSourcePage;
return(true);
}
QueryPage sourcePage = tryGetSourcePage.Result;
List <CosmosElement> distinctResults = new List <CosmosElement>();
foreach (CosmosElement document in sourcePage.Documents)
{
if (this.distinctMap.Add(document, out UInt128 _))
{
distinctResults.Add(document);
}
}
QueryState queryState;
if (sourcePage.State != null)
{
DistinctContinuationToken distinctContinuationToken = new DistinctContinuationToken(
sourceToken: sourcePage.State.Value,
distinctMapToken: this.distinctMap.GetCosmosElementContinuationToken());
queryState = new QueryState(DistinctContinuationToken.ToCosmosElement(distinctContinuationToken));
}
else
{
queryState = null;
}
QueryPage queryPage = new QueryPage(
documents: distinctResults,
requestCharge: sourcePage.RequestCharge,
activityId: sourcePage.ActivityId,
responseLengthInBytes: sourcePage.ResponseLengthInBytes,
cosmosQueryExecutionInfo: sourcePage.CosmosQueryExecutionInfo,
disallowContinuationTokenMessage: ComputeDistinctQueryPipelineStage.UseTryGetContinuationTokenMessage,
additionalHeaders: sourcePage.AdditionalHeaders,
state: queryState);
this.Current = TryCatch <QueryPage> .FromResult(queryPage);
return(true);
}
public static TryCatch <SingleGroupAggregator> TryCreate(
IReadOnlyDictionary <string, AggregateOperator?> aggregateAliasToAggregateType,
IReadOnlyList <string> orderedAliases,
CosmosElement continuationToken)
{
if (aggregateAliasToAggregateType == null)
{
throw new ArgumentNullException(nameof(aggregateAliasToAggregateType));
}
if (orderedAliases == null)
{
throw new ArgumentNullException(nameof(orderedAliases));
}
CosmosObject aliasToContinuationToken;
if (continuationToken != null)
{
if (!(continuationToken is CosmosObject cosmosObject))
{
return(TryCatch <SingleGroupAggregator> .FromException(
new MalformedContinuationTokenException(
$"{nameof(SelectListAggregateValues)} continuation token is malformed: {continuationToken}.")));
}
aliasToContinuationToken = cosmosObject;
}
else
{
aliasToContinuationToken = null;
}
Dictionary <string, AggregateValue> groupingTable = new Dictionary <string, AggregateValue>();
foreach (KeyValuePair <string, AggregateOperator?> aliasToAggregate in aggregateAliasToAggregateType)
{
string alias = aliasToAggregate.Key;
AggregateOperator?aggregateOperator = aliasToAggregate.Value;
CosmosElement aliasContinuationToken;
if (aliasToContinuationToken != null)
{
aliasContinuationToken = aliasToContinuationToken[alias];
}
else
{
aliasContinuationToken = null;
}
TryCatch <AggregateValue> tryCreateAggregateValue = AggregateValue.TryCreate(
aggregateOperator,
aliasContinuationToken);
if (tryCreateAggregateValue.Succeeded)
{
groupingTable[alias] = tryCreateAggregateValue.Result;
}
else
{
return(TryCatch <SingleGroupAggregator> .FromException(tryCreateAggregateValue.Exception));
}
}
return(TryCatch <SingleGroupAggregator> .FromResult(new SelectListAggregateValues(groupingTable, orderedAliases)));
}
public async ValueTask <bool> MoveNextAsync()
{
this.cancellationToken.ThrowIfCancellationRequested();
PriorityQueue <PartitionRangePageAsyncEnumerator <TPage, TState> > enumerators = await this.lazyEnumerators.GetValueAsync(cancellationToken : this.cancellationToken);
if (enumerators.Count == 0)
{
return(false);
}
PartitionRangePageAsyncEnumerator <TPage, TState> currentPaginator = enumerators.Dequeue();
if (!await currentPaginator.MoveNextAsync())
{
// Current enumerator is empty,
// so recursively retry on the next enumerator.
return(await this.MoveNextAsync());
}
if (currentPaginator.Current.Failed)
{
// Check if it's a retryable exception.
Exception exception = currentPaginator.Current.Exception;
while (exception.InnerException != null)
{
exception = exception.InnerException;
}
if (IsSplitException(exception))
{
// Handle split
IEnumerable <PartitionKeyRange> childRanges = await this.feedRangeProvider.GetChildRangeAsync(
currentPaginator.Range,
cancellationToken : this.cancellationToken);
foreach (PartitionKeyRange childRange in childRanges)
{
PartitionRangePageAsyncEnumerator <TPage, TState> childPaginator = this.createPartitionRangeEnumerator(
childRange,
currentPaginator.State);
enumerators.Enqueue(childPaginator);
}
// Recursively retry
return(await this.MoveNextAsync());
}
if (IsMergeException(exception))
{
throw new NotImplementedException();
}
// Just enqueue the paginator and the user can decide if they want to retry.
enumerators.Enqueue(currentPaginator);
this.Current = TryCatch <CrossPartitionPage <TPage, TState> > .FromException(currentPaginator.Current.Exception);
return(true);
}
if (currentPaginator.State != default)
{
// Don't enqueue the paginator otherwise it's an infinite loop.
enumerators.Enqueue(currentPaginator);
}
CrossPartitionState <TState> crossPartitionState;
if (enumerators.Count == 0)
{
crossPartitionState = null;
}
else
{
List <(PartitionKeyRange, TState)> feedRangeAndStates = new List <(PartitionKeyRange, TState)>(enumerators.Count);
foreach (PartitionRangePageAsyncEnumerator <TPage, TState> enumerator in enumerators)
{
feedRangeAndStates.Add((enumerator.Range, enumerator.State));
}
crossPartitionState = new CrossPartitionState <TState>(feedRangeAndStates);
}
this.Current = TryCatch <CrossPartitionPage <TPage, TState> > .FromResult(
new CrossPartitionPage <TPage, TState>(currentPaginator.Current.Result, crossPartitionState));
return(true);
}
private static TryCatch <QueryPage> GetCosmosElementResponse(
Guid clientQueryCorrelationId,
QueryRequestOptions requestOptions,
ResourceType resourceType,
ResponseMessage cosmosResponseMessage,
PartitionKeyRangeIdentity partitionKeyRangeIdentity,
Action <QueryPageDiagnostics> queryPageDiagnostics)
{
using (cosmosResponseMessage)
{
QueryPageDiagnostics queryPage = new QueryPageDiagnostics(
clientQueryCorrelationId: clientQueryCorrelationId,
partitionKeyRangeId: partitionKeyRangeIdentity.PartitionKeyRangeId,
queryMetricText: cosmosResponseMessage.Headers.QueryMetricsText,
indexUtilizationText: cosmosResponseMessage.Headers[HttpConstants.HttpHeaders.IndexUtilization],
diagnosticsContext: cosmosResponseMessage.DiagnosticsContext);
queryPageDiagnostics(queryPage);
if (!cosmosResponseMessage.IsSuccessStatusCode)
{
CosmosException exception;
if (cosmosResponseMessage.CosmosException != null)
{
exception = cosmosResponseMessage.CosmosException;
}
else
{
exception = new CosmosException(
cosmosResponseMessage.ErrorMessage,
cosmosResponseMessage.StatusCode,
(int)cosmosResponseMessage.Headers.SubStatusCode,
cosmosResponseMessage.Headers.ActivityId,
cosmosResponseMessage.Headers.RequestCharge);
}
return(TryCatch <QueryPage> .FromException(exception));
}
if (!(cosmosResponseMessage.Content is MemoryStream memoryStream))
{
memoryStream = new MemoryStream();
cosmosResponseMessage.Content.CopyTo(memoryStream);
}
long responseLengthBytes = memoryStream.Length;
CosmosArray documents = CosmosQueryClientCore.ParseElementsFromRestStream(
memoryStream,
resourceType,
requestOptions.CosmosSerializationFormatOptions);
CosmosQueryExecutionInfo cosmosQueryExecutionInfo;
if (cosmosResponseMessage.Headers.TryGetValue(QueryExecutionInfoHeader, out string queryExecutionInfoString))
{
cosmosQueryExecutionInfo = JsonConvert.DeserializeObject <CosmosQueryExecutionInfo>(queryExecutionInfoString);
}
else
{
cosmosQueryExecutionInfo = default;
}
QueryState queryState;
if (cosmosResponseMessage.Headers.ContinuationToken != null)
{
queryState = new QueryState(CosmosString.Create(cosmosResponseMessage.Headers.ContinuationToken));
}
else
{
queryState = default;
}
QueryPage response = new QueryPage(
documents,
cosmosResponseMessage.Headers.RequestCharge,
cosmosResponseMessage.Headers.ActivityId,
responseLengthBytes,
cosmosQueryExecutionInfo,
disallowContinuationTokenMessage: null,
queryState);
return(TryCatch <QueryPage> .FromResult(response));
}
}
public override TryCatch <ChangeFeedCrossFeedRangeState> Visit(ChangeFeedStartFromNow startFromNow)
{
return(TryCatch <ChangeFeedCrossFeedRangeState> .FromResult(
ChangeFeedCrossFeedRangeState.CreateFromNow(startFromNow.FeedRange)));
}
private static TryCatch <CrossFeedRangeState <QueryState> > MonadicExtractState(
CosmosElement continuationToken,
IReadOnlyList <FeedRangeEpk> ranges)
{
if (continuationToken == null)
{
// Full fan out to the ranges with null continuations
CrossFeedRangeState <QueryState> fullFanOutState = new CrossFeedRangeState <QueryState>(ranges.Select(range => new FeedRangeState <QueryState>(range, (QueryState)null)).ToArray());
return(TryCatch <CrossFeedRangeState <QueryState> > .FromResult(fullFanOutState));
}
if (!(continuationToken is CosmosArray parallelContinuationTokenListRaw))
{
return(TryCatch <CrossFeedRangeState <QueryState> > .FromException(
new MalformedContinuationTokenException(
$"Invalid format for continuation token {continuationToken} for {nameof(ParallelCrossPartitionQueryPipelineStage)}")));
}
if (parallelContinuationTokenListRaw.Count == 0)
{
return(TryCatch <CrossFeedRangeState <QueryState> > .FromException(
new MalformedContinuationTokenException(
$"Invalid format for continuation token {continuationToken} for {nameof(ParallelCrossPartitionQueryPipelineStage)}")));
}
List <ParallelContinuationToken> parallelContinuationTokens = new List <ParallelContinuationToken>();
foreach (CosmosElement parallelContinuationTokenRaw in parallelContinuationTokenListRaw)
{
TryCatch <ParallelContinuationToken> tryCreateParallelContinuationToken = ParallelContinuationToken.TryCreateFromCosmosElement(parallelContinuationTokenRaw);
if (tryCreateParallelContinuationToken.Failed)
{
return(TryCatch <CrossFeedRangeState <QueryState> > .FromException(
tryCreateParallelContinuationToken.Exception));
}
parallelContinuationTokens.Add(tryCreateParallelContinuationToken.Result);
}
TryCatch <PartitionMapping <ParallelContinuationToken> > partitionMappingMonad = PartitionMapper.MonadicGetPartitionMapping(
ranges,
parallelContinuationTokens);
if (partitionMappingMonad.Failed)
{
return(TryCatch <CrossFeedRangeState <QueryState> > .FromException(
partitionMappingMonad.Exception));
}
PartitionMapping <ParallelContinuationToken> partitionMapping = partitionMappingMonad.Result;
List <FeedRangeState <QueryState> > feedRangeStates = new List <FeedRangeState <QueryState> >();
List <IReadOnlyDictionary <FeedRangeEpk, ParallelContinuationToken> > rangesToInitialize = new List <IReadOnlyDictionary <FeedRangeEpk, ParallelContinuationToken> >()
{
// Skip all the partitions left of the target range, since they have already been drained fully.
partitionMapping.TargetMapping,
partitionMapping.MappingRightOfTarget,
};
foreach (IReadOnlyDictionary <FeedRangeEpk, ParallelContinuationToken> rangeToInitalize in rangesToInitialize)
{
foreach (KeyValuePair <FeedRangeEpk, ParallelContinuationToken> kvp in rangeToInitalize)
{
FeedRangeState <QueryState> feedRangeState = new FeedRangeState <QueryState>(kvp.Key, kvp.Value?.Token != null ? new QueryState(CosmosString.Create(kvp.Value.Token)) : null);
feedRangeStates.Add(feedRangeState);
}
}
CrossFeedRangeState <QueryState> crossPartitionState = new CrossFeedRangeState <QueryState>(feedRangeStates.ToArray());
return(TryCatch <CrossFeedRangeState <QueryState> > .FromResult(crossPartitionState));
}
public override TryCatch <ChangeFeedCrossFeedRangeState> Visit(ChangeFeedStartFromTime startFromTime)
{
return(TryCatch <ChangeFeedCrossFeedRangeState> .FromResult(
ChangeFeedCrossFeedRangeState.CreateFromTime(startFromTime.StartTime, startFromTime.FeedRange)));
}
public async ValueTask <bool> MoveNextAsync(ITrace trace)
{
this.cancellationToken.ThrowIfCancellationRequested();
if (trace == null)
{
throw new ArgumentNullException(nameof(trace));
}
using (ITrace changeFeedMoveNextTrace = trace.StartChild("ChangeFeed MoveNextAsync", TraceComponent.ChangeFeed, TraceLevel.Info))
{
if (this.bufferedException.HasValue)
{
this.Current = this.bufferedException.Value;
this.bufferedException = null;
return(true);
}
if (!await this.crossPartitionEnumerator.MoveNextAsync(changeFeedMoveNextTrace))
{
throw new InvalidOperationException("ChangeFeed should always have a next page.");
}
TryCatch <CrossFeedRangePage <ChangeFeedPage, ChangeFeedState> > monadicCrossPartitionPage = this.crossPartitionEnumerator.Current;
if (monadicCrossPartitionPage.Failed)
{
this.Current = TryCatch <CrossFeedRangePage <ChangeFeedPage, ChangeFeedState> > .FromException(monadicCrossPartitionPage.Exception);
return(true);
}
CrossFeedRangePage <ChangeFeedPage, ChangeFeedState> crossFeedRangePage = monadicCrossPartitionPage.Result;
ChangeFeedPage backendPage = crossFeedRangePage.Page;
if (backendPage is ChangeFeedNotModifiedPage)
{
using (ITrace drainNotModifedPages = changeFeedMoveNextTrace.StartChild("Drain NotModified Pages", TraceComponent.ChangeFeed, TraceLevel.Info))
{
// Keep draining the cross partition enumerator until
// We get a non 304 page or we loop back to the same range or run into an exception
FeedRangeInternal originalRange = this.crossPartitionEnumerator.CurrentRange;
double totalRequestCharge = backendPage.RequestCharge;
do
{
if (!await this.crossPartitionEnumerator.MoveNextAsync(drainNotModifedPages))
{
throw new InvalidOperationException("ChangeFeed should always have a next page.");
}
monadicCrossPartitionPage = this.crossPartitionEnumerator.Current;
if (monadicCrossPartitionPage.Failed)
{
// Buffer the exception, since we need to return the request charge so far.
this.bufferedException = TryCatch <CrossFeedRangePage <ChangeFeedPage, ChangeFeedState> > .FromException(monadicCrossPartitionPage.Exception);
}
else
{
crossFeedRangePage = monadicCrossPartitionPage.Result;
backendPage = crossFeedRangePage.Page;
totalRequestCharge += backendPage.RequestCharge;
}
}while (!(backendPage is ChangeFeedSuccessPage ||
this.crossPartitionEnumerator.CurrentRange.Equals(originalRange) ||
this.bufferedException.HasValue));
// Create a page with the aggregated request charge
if (backendPage is ChangeFeedSuccessPage changeFeedSuccessPage)
{
backendPage = new ChangeFeedSuccessPage(
changeFeedSuccessPage.Content,
totalRequestCharge,
changeFeedSuccessPage.ActivityId,
changeFeedSuccessPage.State);
}
else
{
backendPage = new ChangeFeedNotModifiedPage(
totalRequestCharge,
backendPage.ActivityId,
backendPage.State);
}
}
}
crossFeedRangePage = new CrossFeedRangePage <ChangeFeedPage, ChangeFeedState>(
backendPage,
crossFeedRangePage.State);
this.Current = TryCatch <CrossFeedRangePage <ChangeFeedPage, ChangeFeedState> > .FromResult(crossFeedRangePage);
return(true);
}
}
public override TryCatch <ChangeFeedCrossFeedRangeState> Visit(ChangeFeedStartFromBeginning startFromBeginning)
{
return(TryCatch <ChangeFeedCrossFeedRangeState> .FromResult(
ChangeFeedCrossFeedRangeState.CreateFromBeginning(startFromBeginning.FeedRange)));
}
public async ValueTask <bool> MoveNextAsync(ITrace trace)
{
if (trace == null)
{
throw new ArgumentNullException(nameof(trace));
}
using (ITrace childTrace = trace.StartChild(name: nameof(MoveNextAsync), component: TraceComponent.Pagination, level: TraceLevel.Info))
{
IQueue <PartitionRangePageAsyncEnumerator <TPage, TState> > enumerators = await this.lazyEnumerators.GetValueAsync(
childTrace,
cancellationToken : this.cancellationToken);
if (enumerators.Count == 0)
{
this.Current = default;
this.CurrentRange = default;
this.nextState = default;
return(false);
}
PartitionRangePageAsyncEnumerator <TPage, TState> currentPaginator = enumerators.Dequeue();
currentPaginator.SetCancellationToken(this.cancellationToken);
bool moveNextResult = false;
try
{
moveNextResult = await currentPaginator.MoveNextAsync(childTrace);
}
catch
{
// Re-queue the enumerator to avoid emptying the queue
enumerators.Enqueue(currentPaginator);
throw;
}
if (!moveNextResult)
{
// Current enumerator is empty,
// so recursively retry on the next enumerator.
return(await this.MoveNextAsync(childTrace));
}
if (currentPaginator.Current.Failed)
{
// Check if it's a retryable exception.
Exception exception = currentPaginator.Current.Exception;
while (exception.InnerException != null)
{
exception = exception.InnerException;
}
if (IsSplitException(exception))
{
// Handle split
List <FeedRangeEpk> childRanges = await this.feedRangeProvider.GetChildRangeAsync(
currentPaginator.FeedRangeState.FeedRange,
childTrace,
this.cancellationToken);
if (childRanges.Count <= 1)
{
// We optimistically assumed that the cache is not stale.
// In the event that it is (where we only get back one child / the partition that we think got split)
// Then we need to refresh the cache
await this.feedRangeProvider.RefreshProviderAsync(childTrace, this.cancellationToken);
childRanges = await this.feedRangeProvider.GetChildRangeAsync(
currentPaginator.FeedRangeState.FeedRange,
childTrace,
this.cancellationToken);
}
if (childRanges.Count < 1)
{
string errorMessage = "SDK invariant violated 4795CC37: Must have at least one EPK range in a cross partition enumerator";
throw Resource.CosmosExceptions.CosmosExceptionFactory.CreateInternalServerErrorException(
message: errorMessage,
headers: null,
stackTrace: null,
trace: childTrace,
error: new Microsoft.Azure.Documents.Error {
Code = "SDK_invariant_violated_4795CC37", Message = errorMessage
});
}
if (childRanges.Count == 1)
{
// On a merge, the 410/1002 results in a single parent
// We maintain the current enumerator's range and let the RequestInvokerHandler logic kick in
enumerators.Enqueue(currentPaginator);
}
else
{
// Split
foreach (FeedRangeInternal childRange in childRanges)
{
PartitionRangePageAsyncEnumerator <TPage, TState> childPaginator = this.createPartitionRangeEnumerator(
new FeedRangeState <TState>(childRange, currentPaginator.FeedRangeState.State));
enumerators.Enqueue(childPaginator);
}
}
// Recursively retry
return(await this.MoveNextAsync(childTrace));
}
// Just enqueue the paginator and the user can decide if they want to retry.
enumerators.Enqueue(currentPaginator);
this.Current = TryCatch <CrossFeedRangePage <TPage, TState> > .FromException(currentPaginator.Current.Exception);
this.CurrentRange = currentPaginator.FeedRangeState.FeedRange;
this.nextState = CrossPartitionRangePageAsyncEnumerator <TPage, TState> .GetNextRange(enumerators);
return(true);
}
if (currentPaginator.FeedRangeState.State != default)
{
// Don't enqueue the paginator otherwise it's an infinite loop.
enumerators.Enqueue(currentPaginator);
}
CrossFeedRangeState <TState> crossPartitionState;
if (enumerators.Count == 0)
{
crossPartitionState = null;
}
else
{
FeedRangeState <TState>[] feedRangeAndStates = new FeedRangeState <TState> [enumerators.Count];
int i = 0;
foreach (PartitionRangePageAsyncEnumerator <TPage, TState> enumerator in enumerators)
{
feedRangeAndStates[i++] = enumerator.FeedRangeState;
}
crossPartitionState = new CrossFeedRangeState <TState>(feedRangeAndStates);
}
this.Current = TryCatch <CrossFeedRangePage <TPage, TState> > .FromResult(
new CrossFeedRangePage <TPage, TState>(currentPaginator.Current.Result, crossPartitionState));
this.CurrentRange = currentPaginator.FeedRangeState.FeedRange;
this.nextState = CrossPartitionRangePageAsyncEnumerator <TPage, TState> .GetNextRange(enumerators);
return(true);
}
}
public override async ValueTask <bool> MoveNextAsync(ITrace trace)
{
this.cancellationToken.ThrowIfCancellationRequested();
if (trace == null)
{
throw new ArgumentNullException(nameof(trace));
}
if (!await this.inputStage.MoveNextAsync(trace))
{
this.Current = default;
return(false);
}
TryCatch <QueryPage> tryGetSourcePage = this.inputStage.Current;
if (tryGetSourcePage.Failed)
{
this.Current = tryGetSourcePage;
return(true);
}
QueryPage sourcePage = tryGetSourcePage.Result;
List <CosmosElement> distinctResults = new List <CosmosElement>();
foreach (CosmosElement document in sourcePage.Documents)
{
this.cancellationToken.ThrowIfCancellationRequested();
if (this.distinctMap.Add(document, out UInt128 _))
{
distinctResults.Add(document);
}
}
// For clients we write out the continuation token if it's a streaming query.
QueryPage queryPage;
if (this.distinctQueryType == DistinctQueryType.Ordered)
{
QueryState state;
if (sourcePage.State != null)
{
string updatedContinuationToken = new DistinctContinuationToken(
sourceToken: sourcePage.State.Value.ToString(),
distinctMapToken: this.distinctMap.GetContinuationToken()).ToString();
state = new QueryState(CosmosElement.Parse(updatedContinuationToken));
}
else
{
state = null;
}
queryPage = new QueryPage(
documents: distinctResults,
requestCharge: sourcePage.RequestCharge,
activityId: sourcePage.ActivityId,
responseLengthInBytes: sourcePage.ResponseLengthInBytes,
cosmosQueryExecutionInfo: sourcePage.CosmosQueryExecutionInfo,
disallowContinuationTokenMessage: sourcePage.DisallowContinuationTokenMessage,
additionalHeaders: sourcePage.AdditionalHeaders,
state: state);
}
else
{
queryPage = new QueryPage(
documents: distinctResults,
requestCharge: sourcePage.RequestCharge,
activityId: sourcePage.ActivityId,
responseLengthInBytes: sourcePage.ResponseLengthInBytes,
cosmosQueryExecutionInfo: sourcePage.CosmosQueryExecutionInfo,
disallowContinuationTokenMessage: ClientDistinctQueryPipelineStage.DisallowContinuationTokenMessage,
additionalHeaders: sourcePage.AdditionalHeaders,
state: null);
}
this.Current = TryCatch <QueryPage> .FromResult(queryPage);
return(true);
}
public static TryCatch <PartitionMapping <PartitionedToken> > TryGetInitializationInfo <PartitionedToken>(
IReadOnlyList <PartitionKeyRange> partitionKeyRanges,
IReadOnlyList <PartitionedToken> partitionedContinuationTokens)
where PartitionedToken : IPartitionedToken
{
if (partitionKeyRanges == null)
{
throw new ArgumentNullException(nameof(partitionKeyRanges));
}
if (partitionedContinuationTokens == null)
{
throw new ArgumentNullException(nameof(partitionedContinuationTokens));
}
if (partitionKeyRanges.Count < 1)
{
throw new ArgumentException(nameof(partitionKeyRanges));
}
if (partitionedContinuationTokens.Count < 1)
{
throw new ArgumentException(nameof(partitionKeyRanges));
}
if (partitionedContinuationTokens.Count > partitionKeyRanges.Count)
{
throw new ArgumentException($"{nameof(partitionedContinuationTokens)} can not have more elements than {nameof(partitionKeyRanges)}.");
}
// Find the continuation token for the partition we left off on:
PartitionedToken firstContinuationToken = partitionedContinuationTokens
.OrderBy((partitionedToken) => partitionedToken.PartitionRange.Min)
.First();
// Segment the ranges based off that:
ReadOnlyMemory <PartitionKeyRange> sortedRanges = partitionKeyRanges
.OrderBy((partitionKeyRange) => partitionKeyRange.MinInclusive)
.ToArray();
PartitionKeyRange firstContinuationRange = new PartitionKeyRange
{
MinInclusive = firstContinuationToken.PartitionRange.Min,
MaxExclusive = firstContinuationToken.PartitionRange.Max
};
int matchedIndex = sortedRanges.Span.BinarySearch(
firstContinuationRange,
Comparer <PartitionKeyRange> .Create((range1, range2) => string.CompareOrdinal(range1.MinInclusive, range2.MinInclusive)));
if (matchedIndex < 0)
{
return(TryCatch <PartitionMapping <PartitionedToken> > .FromException(
new MalformedContinuationTokenException(
$"{RMResources.InvalidContinuationToken} - Could not find continuation token: {firstContinuationToken}")));
}
ReadOnlyMemory <PartitionKeyRange> partitionsLeftOfTarget = matchedIndex == 0 ? ReadOnlyMemory <PartitionKeyRange> .Empty : sortedRanges.Slice(start: 0, length: matchedIndex);
ReadOnlyMemory <PartitionKeyRange> targetPartition = sortedRanges.Slice(start: matchedIndex, length: 1);
ReadOnlyMemory <PartitionKeyRange> partitionsRightOfTarget = matchedIndex == sortedRanges.Length - 1 ? ReadOnlyMemory <PartitionKeyRange> .Empty : sortedRanges.Slice(start: matchedIndex + 1);
// Create the continuation token mapping for each region.
IReadOnlyDictionary <PartitionKeyRange, PartitionedToken> mappingForPartitionsLeftOfTarget = MatchRangesToContinuationTokens(
partitionsLeftOfTarget,
partitionedContinuationTokens);
IReadOnlyDictionary <PartitionKeyRange, PartitionedToken> mappingForTargetPartition = MatchRangesToContinuationTokens(
targetPartition,
partitionedContinuationTokens);
IReadOnlyDictionary <PartitionKeyRange, PartitionedToken> mappingForPartitionsRightOfTarget = MatchRangesToContinuationTokens(
partitionsRightOfTarget,
partitionedContinuationTokens);
return(TryCatch <PartitionMapping <PartitionedToken> > .FromResult(
new PartitionMapping <PartitionedToken>(
partitionsLeftOfTarget : mappingForPartitionsLeftOfTarget,
targetPartition : mappingForTargetPartition,
partitionsRightOfTarget : mappingForPartitionsRightOfTarget)));
}
public static TryCatch <IQueryPipelineStage> MonadicCreate(
CosmosElement requestContinuation,
CancellationToken cancellationToken,
MonadicCreatePipelineStage monadicCreatePipelineStage,
DistinctQueryType distinctQueryType)
{
if (monadicCreatePipelineStage == null)
{
throw new ArgumentNullException(nameof(monadicCreatePipelineStage));
}
DistinctContinuationToken distinctContinuationToken;
if (requestContinuation != null)
{
if (!DistinctContinuationToken.TryParse(requestContinuation, out distinctContinuationToken))
{
return(TryCatch <IQueryPipelineStage> .FromException(
new MalformedContinuationTokenException(
$"Invalid {nameof(DistinctContinuationToken)}: {requestContinuation}")));
}
}
else
{
distinctContinuationToken = new DistinctContinuationToken(
sourceToken: null,
distinctMapToken: null);
}
CosmosElement distinctMapToken = distinctContinuationToken.DistinctMapToken != null
? CosmosString.Create(distinctContinuationToken.DistinctMapToken)
: null;
TryCatch <DistinctMap> tryCreateDistinctMap = DistinctMap.TryCreate(
distinctQueryType,
distinctMapToken);
if (!tryCreateDistinctMap.Succeeded)
{
return(TryCatch <IQueryPipelineStage> .FromException(tryCreateDistinctMap.Exception));
}
CosmosElement sourceToken;
if (distinctContinuationToken.SourceToken != null)
{
TryCatch <CosmosElement> tryParse = CosmosElement.Monadic.Parse(distinctContinuationToken.SourceToken);
if (tryParse.Failed)
{
return(TryCatch <IQueryPipelineStage> .FromException(
new MalformedContinuationTokenException(
message : $"Invalid Source Token: {distinctContinuationToken.SourceToken}",
innerException : tryParse.Exception)));
}
sourceToken = tryParse.Result;
}
else
{
sourceToken = null;
}
TryCatch <IQueryPipelineStage> tryCreateSource = monadicCreatePipelineStage(sourceToken, cancellationToken);
if (!tryCreateSource.Succeeded)
{
return(TryCatch <IQueryPipelineStage> .FromException(tryCreateSource.Exception));
}
return(TryCatch <IQueryPipelineStage> .FromResult(
new ClientDistinctQueryPipelineStage(
distinctQueryType,
tryCreateDistinctMap.Result,
tryCreateSource.Result,
cancellationToken)));
}
public static TryCatch <OrderByContinuationToken> TryCreateFromCosmosElement(CosmosElement cosmosElement)
{
if (!(cosmosElement is CosmosObject cosmosObject))
{
return(TryCatch <OrderByContinuationToken> .FromException(
new MalformedContinuationTokenException($"{nameof(OrderByContinuationToken)} is not an object: {cosmosElement}")));
}
if (!cosmosObject.TryGetValue(PropertyNames.CompositeToken, out CosmosElement compositeContinuationTokenElement))
{
return(TryCatch <OrderByContinuationToken> .FromException(
new MalformedContinuationTokenException($"{nameof(OrderByContinuationToken)} is missing field: '{PropertyNames.CompositeToken}': {cosmosElement}")));
}
TryCatch <ParallelContinuationToken> tryCompositeContinuation = ParallelContinuationToken.TryCreateFromCosmosElement(compositeContinuationTokenElement);
if (!tryCompositeContinuation.Succeeded)
{
return(TryCatch <OrderByContinuationToken> .FromException(tryCompositeContinuation.Exception));
}
ParallelContinuationToken compositeContinuationToken = tryCompositeContinuation.Result;
if (!cosmosObject.TryGetValue(PropertyNames.OrderByItems, out CosmosArray orderByItemsRaw))
{
return(TryCatch <OrderByContinuationToken> .FromException(
new MalformedContinuationTokenException($"{nameof(OrderByContinuationToken)} is missing field: '{PropertyNames.OrderByItems}': {cosmosElement}")));
}
List <OrderByItem> orderByItems = orderByItemsRaw.Select(x => OrderByItem.FromCosmosElement(x)).ToList();
if (!cosmosObject.TryGetValue(PropertyNames.Rid, out CosmosString ridRaw))
{
return(TryCatch <OrderByContinuationToken> .FromException(
new MalformedContinuationTokenException($"{nameof(OrderByContinuationToken)} is missing field: '{PropertyNames.Rid}': {cosmosElement}")));
}
string rid = ridRaw.Value;
if (!cosmosObject.TryGetValue(PropertyNames.SkipCount, out CosmosNumber64 skipCountRaw))
{
return(TryCatch <OrderByContinuationToken> .FromException(
new MalformedContinuationTokenException($"{nameof(OrderByContinuationToken)} is missing field: '{PropertyNames.SkipCount}': {cosmosElement}")));
}
int skipCount = (int)Number64.ToLong(skipCountRaw.GetValue());
if (!cosmosObject.TryGetValue(PropertyNames.Filter, out CosmosElement filterRaw))
{
return(TryCatch <OrderByContinuationToken> .FromException(
new MalformedContinuationTokenException($"{nameof(OrderByContinuationToken)} is missing field: '{PropertyNames.Filter}': {cosmosElement}")));
}
string filter;
if (filterRaw is CosmosString filterStringRaw)
{
filter = filterStringRaw.Value;
}
else
{
filter = null;
}
OrderByContinuationToken orderByContinuationToken = new OrderByContinuationToken(
compositeContinuationToken,
orderByItems,
rid,
skipCount,
filter);
return(TryCatch <OrderByContinuationToken> .FromResult(orderByContinuationToken));
}
private (Func <string, Task <TryCatch <IDocumentQueryExecutionComponent> > >, QueryResponseCore) SetupBaseContextToVerifyFailureScenario()
{
IReadOnlyCollection <QueryPageDiagnostics> diagnostics = new List <QueryPageDiagnostics>()
{
new QueryPageDiagnostics(
"0",
"SomeQueryMetricText",
"SomeIndexUtilText",
new PointOperationStatistics(
Guid.NewGuid().ToString(),
System.Net.HttpStatusCode.Unauthorized,
subStatusCode: SubStatusCodes.PartitionKeyMismatch,
requestCharge: 4,
errorMessage: null,
method: HttpMethod.Post,
requestUri: new Uri("http://localhost.com"),
requestSessionToken: null,
responseSessionToken: null,
clientSideRequestStatistics: null),
new SchedulingStopwatch())
};
QueryResponseCore failure = QueryResponseCore.CreateFailure(
System.Net.HttpStatusCode.Unauthorized,
SubStatusCodes.PartitionKeyMismatch,
"Random error message",
42.89,
"TestActivityId",
diagnostics);
Mock <IDocumentQueryExecutionComponent> baseContext = new Mock <IDocumentQueryExecutionComponent>();
baseContext.Setup(x => x.DrainAsync(It.IsAny <int>(), It.IsAny <CancellationToken>())).Returns(Task.FromResult <QueryResponseCore>(failure));
Func <string, Task <TryCatch <IDocumentQueryExecutionComponent> > > callBack = x => Task.FromResult <TryCatch <IDocumentQueryExecutionComponent> >(TryCatch <IDocumentQueryExecutionComponent> .FromResult(baseContext.Object));
return(callBack, failure);
}
/// <summary>
/// <para>
/// If a query encounters split up resuming using continuation, we need to regenerate the continuation tokens.
/// Specifically, since after split we will have new set of ranges, we need to remove continuation token for the
/// parent partition and introduce continuation token for the child partitions.
/// </para>
/// <para>
/// This function does that. Also in that process, we also check validity of the input continuation tokens. For example,
/// even after split the boundary ranges of the child partitions should match with the parent partitions. If the Min and Max
/// range of a target partition in the continuation token was Min1 and Max1. Then the Min and Max range info for the two
/// corresponding child partitions C1Min, C1Max, C2Min, and C2Max should follow the constrain below:
/// PMax = C2Max > C2Min > C1Max > C1Min = PMin.
/// </para>
/// </summary>
/// <param name="partitionKeyRanges">The partition key ranges to extract continuation tokens for.</param>
/// <param name="suppliedContinuationTokens">The continuation token that the user supplied.</param>
/// <typeparam name="TContinuationToken">The type of continuation token to generate.</typeparam>
/// <Remarks>
/// The code assumes that merge doesn't happen and
/// </Remarks>
/// <returns>The index of the partition whose MinInclusive is equal to the suppliedContinuationTokens along with the continuation tokens.</returns>
public static TryCatch <InitInfo <TContinuationToken> > TryFindTargetRangeAndExtractContinuationTokens <TContinuationToken>(
List <PartitionKeyRange> partitionKeyRanges,
IEnumerable <Tuple <TContinuationToken, Documents.Routing.Range <string> > > suppliedContinuationTokens)
{
if (partitionKeyRanges == null)
{
throw new ArgumentNullException(nameof(partitionKeyRanges));
}
if (partitionKeyRanges.Count < 1)
{
throw new ArgumentException(nameof(partitionKeyRanges));
}
foreach (PartitionKeyRange partitionKeyRange in partitionKeyRanges)
{
if (partitionKeyRange == null)
{
throw new ArgumentException(nameof(partitionKeyRanges));
}
}
if (suppliedContinuationTokens == null)
{
throw new ArgumentNullException(nameof(suppliedContinuationTokens));
}
if (suppliedContinuationTokens.Count() < 1)
{
throw new ArgumentException(nameof(suppliedContinuationTokens));
}
if (suppliedContinuationTokens.Count() > partitionKeyRanges.Count)
{
throw new ArgumentException($"{nameof(suppliedContinuationTokens)} can not have more elements than {nameof(partitionKeyRanges)}.");
}
Dictionary <string, TContinuationToken> targetRangeToContinuationTokenMap = new Dictionary <string, TContinuationToken>();
// Find the minimum index.
Tuple <TContinuationToken, Documents.Routing.Range <string> > firstContinuationTokenAndRange = suppliedContinuationTokens
.OrderBy((tuple) => tuple.Item2.Min)
.First();
TContinuationToken firstContinuationToken = firstContinuationTokenAndRange.Item1;
PartitionKeyRange firstContinuationRange = new PartitionKeyRange
{
MinInclusive = firstContinuationTokenAndRange.Item2.Min,
MaxExclusive = firstContinuationTokenAndRange.Item2.Max
};
int minIndex = partitionKeyRanges.BinarySearch(
firstContinuationRange,
Comparer <PartitionKeyRange> .Create((range1, range2) => string.CompareOrdinal(range1.MinInclusive, range2.MinInclusive)));
if (minIndex < 0)
{
return(TryCatch <InitInfo <TContinuationToken> > .FromException(
new MalformedContinuationTokenException(
$"{RMResources.InvalidContinuationToken} - Could not find continuation token: {firstContinuationToken}")));
}
foreach (Tuple <TContinuationToken, Documents.Routing.Range <string> > suppledContinuationToken in suppliedContinuationTokens)
{
// find what ranges make up the supplied continuation token
TContinuationToken continuationToken = suppledContinuationToken.Item1;
Documents.Routing.Range <string> range = suppledContinuationToken.Item2;
IEnumerable <PartitionKeyRange> replacementRanges = partitionKeyRanges
.Where((partitionKeyRange) =>
string.CompareOrdinal(range.Min, partitionKeyRange.MinInclusive) <= 0 &&
string.CompareOrdinal(range.Max, partitionKeyRange.MaxExclusive) >= 0)
.OrderBy((partitionKeyRange) => partitionKeyRange.MinInclusive);
// Could not find the child ranges
if (replacementRanges.Count() == 0)
{
return(TryCatch <InitInfo <TContinuationToken> > .FromException(
new MalformedContinuationTokenException(
$"{RMResources.InvalidContinuationToken} - Could not find continuation token: {continuationToken}")));
}
// PMax = C2Max > C2Min > C1Max > C1Min = PMin.
string parentMax = range.Max;
string child2Max = replacementRanges.Last().MaxExclusive;
string child2Min = replacementRanges.Last().MinInclusive;
string child1Max = replacementRanges.First().MaxExclusive;
string child1Min = replacementRanges.First().MinInclusive;
string parentMin = range.Min;
if (!(parentMax == child2Max &&
string.CompareOrdinal(child2Max, child2Min) >= 0 &&
(replacementRanges.Count() == 1 ? true : string.CompareOrdinal(child2Min, child1Max) >= 0) &&
string.CompareOrdinal(child1Max, child1Min) >= 0 &&
child1Min == parentMin))
{
return(TryCatch <InitInfo <TContinuationToken> > .FromException(
new MalformedContinuationTokenException(
$"{RMResources.InvalidContinuationToken} - PMax = C2Max > C2Min > C1Max > C1Min = PMin: {continuationToken}")));
}
foreach (PartitionKeyRange partitionKeyRange in replacementRanges)
{
targetRangeToContinuationTokenMap.Add(partitionKeyRange.Id, continuationToken);
}
}
return(TryCatch <InitInfo <TContinuationToken> > .FromResult(
new InitInfo <TContinuationToken>(
minIndex,
targetRangeToContinuationTokenMap)));
}
public ReadFeedIteratorCore(
IDocumentContainer documentContainer,
string continuationToken,
ReadFeedPaginationOptions readFeedPaginationOptions,
QueryRequestOptions queryRequestOptions,
CancellationToken cancellationToken)
{
this.queryRequestOptions = queryRequestOptions;
readFeedPaginationOptions ??= ReadFeedPaginationOptions.Default;
if (!string.IsNullOrEmpty(continuationToken))
{
bool isNewArrayFormat = (continuationToken.Length >= 2) && (continuationToken[0] == '[') && (continuationToken[continuationToken.Length - 1] == ']');
if (!isNewArrayFormat)
{
// One of the two older formats
if (!FeedRangeContinuation.TryParse(continuationToken, out FeedRangeContinuation feedRangeContinuation))
{
// Backward compatible with old format
feedRangeContinuation = new FeedRangeCompositeContinuation(
containerRid: string.Empty,
FeedRangeEpk.FullRange,
new List <Documents.Routing.Range <string> >()
{
new Documents.Routing.Range <string>(
Documents.Routing.PartitionKeyInternal.MinimumInclusiveEffectivePartitionKey,
Documents.Routing.PartitionKeyInternal.MaximumExclusiveEffectivePartitionKey,
isMinInclusive: true,
isMaxInclusive: false)
},
continuationToken);
}
// need to massage it a little
List <CosmosElement> feedRangeStates = new List <CosmosElement>();
string oldContinuationFormat = feedRangeContinuation.ToString();
if (feedRangeContinuation.FeedRange is FeedRangePartitionKey feedRangePartitionKey)
{
CosmosObject cosmosObject = CosmosObject.Parse(oldContinuationFormat);
CosmosArray continuations = (CosmosArray)cosmosObject["Continuation"];
if (continuations.Count != 1)
{
throw new InvalidOperationException("Expected only one continuation for partition key queries");
}
CosmosElement continuation = continuations[0];
CosmosObject continuationObject = (CosmosObject)continuation;
CosmosElement token = continuationObject["token"];
ReadFeedState state;
if (token is CosmosNull)
{
state = ReadFeedState.Beginning();
}
else
{
CosmosString tokenAsString = (CosmosString)token;
state = ReadFeedState.Continuation(CosmosElement.Parse(tokenAsString.Value));
}
FeedRangeState <ReadFeedState> feedRangeState = new FeedRangeState <ReadFeedState>(feedRangePartitionKey, state);
feedRangeStates.Add(ReadFeedFeedRangeStateSerializer.ToCosmosElement(feedRangeState));
}
else
{
CosmosObject cosmosObject = CosmosObject.Parse(oldContinuationFormat);
CosmosArray continuations = (CosmosArray)cosmosObject["Continuation"];
foreach (CosmosElement continuation in continuations)
{
CosmosObject continuationObject = (CosmosObject)continuation;
CosmosObject rangeObject = (CosmosObject)continuationObject["range"];
string min = ((CosmosString)rangeObject["min"]).Value;
string max = ((CosmosString)rangeObject["max"]).Value;
CosmosElement token = continuationObject["token"];
FeedRangeInternal feedRange = new FeedRangeEpk(new Documents.Routing.Range <string>(min, max, isMinInclusive: true, isMaxInclusive: false));
ReadFeedState state;
if (token is CosmosNull)
{
state = ReadFeedState.Beginning();
}
else
{
CosmosString tokenAsString = (CosmosString)token;
state = ReadFeedState.Continuation(CosmosElement.Parse(tokenAsString.Value));
}
FeedRangeState <ReadFeedState> feedRangeState = new FeedRangeState <ReadFeedState>(feedRange, state);
feedRangeStates.Add(ReadFeedFeedRangeStateSerializer.ToCosmosElement(feedRangeState));
}
}
CosmosArray cosmosArrayContinuationTokens = CosmosArray.Create(feedRangeStates);
continuationToken = cosmosArrayContinuationTokens.ToString();
}
}
TryCatch <ReadFeedCrossFeedRangeState> monadicReadFeedState;
if (continuationToken == null)
{
FeedRange feedRange;
if ((this.queryRequestOptions != null) && this.queryRequestOptions.PartitionKey.HasValue)
{
feedRange = new FeedRangePartitionKey(this.queryRequestOptions.PartitionKey.Value);
}
else if ((this.queryRequestOptions != null) && (this.queryRequestOptions.FeedRange != null))
{
feedRange = this.queryRequestOptions.FeedRange;
}
else
{
feedRange = FeedRangeEpk.FullRange;
}
monadicReadFeedState = TryCatch <ReadFeedCrossFeedRangeState> .FromResult(ReadFeedCrossFeedRangeState.CreateFromBeginning(feedRange));
}
else
{
monadicReadFeedState = ReadFeedCrossFeedRangeState.Monadic.Parse(continuationToken);
}
if (monadicReadFeedState.Failed)
{
this.monadicEnumerator = TryCatch <CrossPartitionReadFeedAsyncEnumerator> .FromException(monadicReadFeedState.Exception);
}
else
{
this.monadicEnumerator = TryCatch <CrossPartitionReadFeedAsyncEnumerator> .FromResult(
CrossPartitionReadFeedAsyncEnumerator.Create(
documentContainer,
new CrossFeedRangeState <ReadFeedState>(monadicReadFeedState.Result.FeedRangeStates),
readFeedPaginationOptions,
cancellationToken));
}
this.hasMoreResults = true;
}
private static TryCatch <QueryPage> GetCosmosElementResponse(
QueryRequestOptions requestOptions,
ResourceType resourceType,
ResponseMessage cosmosResponseMessage,
ITrace trace)
{
using (ITrace getCosmosElementResponse = trace.StartChild("Get Cosmos Element Response", TraceComponent.Json, Tracing.TraceLevel.Info))
{
using (cosmosResponseMessage)
{
if (cosmosResponseMessage.Headers.QueryMetricsText != null)
{
QueryMetricsTraceDatum datum = new QueryMetricsTraceDatum(
new Lazy <QueryMetrics>(() => new QueryMetrics(
cosmosResponseMessage.Headers.QueryMetricsText,
IndexUtilizationInfo.Empty,
ClientSideMetrics.Empty)));
trace.AddDatum("Query Metrics", datum);
}
if (!cosmosResponseMessage.IsSuccessStatusCode)
{
CosmosException exception = cosmosResponseMessage.CosmosException ?? new CosmosException(
cosmosResponseMessage.ErrorMessage,
cosmosResponseMessage.StatusCode,
(int)cosmosResponseMessage.Headers.SubStatusCode,
cosmosResponseMessage.Headers.ActivityId,
cosmosResponseMessage.Headers.RequestCharge);
return(TryCatch <QueryPage> .FromException(exception));
}
if (!(cosmosResponseMessage.Content is MemoryStream memoryStream))
{
memoryStream = new MemoryStream();
cosmosResponseMessage.Content.CopyTo(memoryStream);
}
long responseLengthBytes = memoryStream.Length;
CosmosArray documents = CosmosQueryClientCore.ParseElementsFromRestStream(
memoryStream,
resourceType,
requestOptions.CosmosSerializationFormatOptions);
QueryState queryState;
if (cosmosResponseMessage.Headers.ContinuationToken != null)
{
queryState = new QueryState(CosmosString.Create(cosmosResponseMessage.Headers.ContinuationToken));
}
else
{
queryState = default;
}
Dictionary <string, string> additionalHeaders = new Dictionary <string, string>();
foreach (string key in cosmosResponseMessage.Headers)
{
if (!QueryPage.BannedHeaders.Contains(key))
{
additionalHeaders[key] = cosmosResponseMessage.Headers[key];
}
}
Lazy <CosmosQueryExecutionInfo> cosmosQueryExecutionInfo = default;
if (cosmosResponseMessage.Headers.TryGetValue(QueryExecutionInfoHeader, out string queryExecutionInfoString))
{
cosmosQueryExecutionInfo =
new Lazy <CosmosQueryExecutionInfo>(
() => JsonConvert.DeserializeObject <CosmosQueryExecutionInfo>(queryExecutionInfoString));
}
QueryPage response = new QueryPage(
documents,
cosmosResponseMessage.Headers.RequestCharge,
cosmosResponseMessage.Headers.ActivityId,
responseLengthBytes,
cosmosQueryExecutionInfo,
disallowContinuationTokenMessage: null,
additionalHeaders,
queryState);
return(TryCatch <QueryPage> .FromResult(response));
}
}
}
public static async Task <TryCatch <IDocumentQueryExecutionComponent> > TryCreateAsync(
CosmosElement requestContinuation,
Func <CosmosElement, Task <TryCatch <IDocumentQueryExecutionComponent> > > tryCreateSourceAsync,
DistinctQueryType distinctQueryType)
{
if (tryCreateSourceAsync == null)
{
throw new ArgumentNullException(nameof(tryCreateSourceAsync));
}
DistinctContinuationToken distinctContinuationToken;
if (requestContinuation != null)
{
if (!DistinctContinuationToken.TryParse(requestContinuation, out distinctContinuationToken))
{
return(TryCatch <IDocumentQueryExecutionComponent> .FromException(
new MalformedContinuationTokenException(
$"Invalid {nameof(DistinctContinuationToken)}: {requestContinuation}")));
}
}
else
{
distinctContinuationToken = new DistinctContinuationToken(
sourceToken: null,
distinctMapToken: null);
}
CosmosElement distinctMapToken;
if (distinctContinuationToken.DistinctMapToken != null)
{
distinctMapToken = CosmosString.Create(distinctContinuationToken.DistinctMapToken);
}
else
{
distinctMapToken = null;
}
TryCatch <DistinctMap> tryCreateDistinctMap = DistinctMap.TryCreate(
distinctQueryType,
distinctMapToken);
if (!tryCreateDistinctMap.Succeeded)
{
return(TryCatch <IDocumentQueryExecutionComponent> .FromException(tryCreateDistinctMap.Exception));
}
CosmosElement sourceToken;
if (distinctContinuationToken.SourceToken != null)
{
if (!CosmosElement.TryParse(distinctContinuationToken.SourceToken, out sourceToken))
{
return(TryCatch <IDocumentQueryExecutionComponent> .FromException(
new MalformedContinuationTokenException(
$"Invalid Source Token: {distinctContinuationToken.SourceToken}")));
}
}
else
{
sourceToken = null;
}
TryCatch <IDocumentQueryExecutionComponent> tryCreateSource = await tryCreateSourceAsync(sourceToken);
if (!tryCreateSource.Succeeded)
{
return(TryCatch <IDocumentQueryExecutionComponent> .FromException(tryCreateSource.Exception));
}
return(TryCatch <IDocumentQueryExecutionComponent> .FromResult(
new ClientDistinctDocumentQueryExecutionComponent(
distinctQueryType,
tryCreateDistinctMap.Result,
tryCreateSource.Result)));
}
