public NetworkRequest <T> BuildSubscribeRequest <T>(string collectionName, string deviceID)
{
const string REST_PATH = "appdata/{appKey}/{collectionName}/_subscribe";
var urlParameters = new Dictionary <string, string>();
urlParameters.Add("appKey", ((KinveyClientRequestInitializer)client.RequestInitializer).AppKey);
urlParameters.Add("collectionName", collectionName);
NetworkRequest <T> subscribeCollection = new NetworkRequest <T>(client, "POST", REST_PATH, null, urlParameters);
JObject requestPayload = new JObject();
requestPayload.Add(Constants.STR_REALTIME_DEVICEID, deviceID);
subscribeCollection.HttpContent = requestPayload;
client.InitializeRequest(subscribeCollection);
return(subscribeCollection);
}
public static PendingWriteAction buildFromRequest <T> (NetworkRequest <T> request)
{
PendingWriteAction newAction = new PendingWriteAction();
newAction.action = request.RequestMethod;
if (request.uriResourceParameters.ContainsKey("entityID"))
{
newAction.entityId = request.uriResourceParameters["entityID"];
}
if (request.uriResourceParameters.ContainsKey("collectionName"))
{
newAction.collection = request.uriResourceParameters["collectionName"];
}
newAction.state = JsonConvert.SerializeObject(request.customRequestHeaders);
return(newAction);
}
public NetworkRequest <T> buildGetCountRequest <T> (string collectionName, string queryString = null)
{
string REST_PATH = "appdata/{appKey}/{collectionName}/_count";
var urlParameters = new Dictionary <string, string> ();
urlParameters.Add("appKey", ((KinveyClientRequestInitializer)client.RequestInitializer).AppKey);
urlParameters.Add("collectionName", collectionName);
if (!string.IsNullOrEmpty(queryString))
{
REST_PATH = "appdata/{appKey}/{collectionName}/_count?query={querystring}";
Dictionary <string, string> modifiers = ParseQueryForModifiers(queryString, ref REST_PATH, ref urlParameters);
}
NetworkRequest <T> getCountQuery = new NetworkRequest <T>(client, "GET", REST_PATH, null, urlParameters);
client.InitializeRequest(getCountQuery);
return(getCountQuery);
}
private async Task <uint> PerformNetworkCount()
{
uint networkCount = default(uint);
try
{
string mongoQuery = this.BuildMongoQuery();
NetworkRequest <JObject> request = Client.NetworkFactory.buildGetCountRequest <JObject>(Collection, mongoQuery);
JObject networkResults = await request.ExecuteAsync().ConfigureAwait(false);
if (networkResults != null)
{
JToken count = networkResults.GetValue("count");
if (count != null)
{
networkCount = count.ToObject <uint>();
}
else
{
throw new KinveyException(EnumErrorCategory.ERROR_DATASTORE_NETWORK,
EnumErrorCode.ERROR_GENERAL,
"Error in FindCountAsync() for network results.");
}
}
}
catch (KinveyException)
{
throw;
}
catch (Exception e)
{
throw new KinveyException(EnumErrorCategory.ERROR_DATASTORE_NETWORK,
EnumErrorCode.ERROR_GENERAL,
"Error in FindCountAsync() for network results.",
e);
}
return(networkCount);
}
private async Task <Tuple <T, KinveyException, int> > HandlePushPOST(PendingWriteAction pwa)
{
T entity = default(T);
var offset = 0;
KinveyException kinveyException = null;
try
{
int result = 0;
string tempID = pwa.entityId;
var localEntity = Cache.FindByID(pwa.entityId);
JObject obj = JObject.FromObject(localEntity);
obj["_id"] = null;
localEntity = Newtonsoft.Json.JsonConvert.DeserializeObject <T>(obj.ToString());
NetworkRequest <T> request = Client.NetworkFactory.buildCreateRequest <T>(pwa.collection, localEntity);
entity = await request.ExecuteAsync().ConfigureAwait(false);
Cache.UpdateCacheSave(entity, tempID);
result = SyncQueue.Remove(pwa);
if (result == 0)
{
offset++;
}
}
catch (KinveyException ke)
{
kinveyException = ke;
offset++;
}
return(new Tuple <T, KinveyException, int>(entity, kinveyException, offset));
}
public override async Task <T> ExecuteAsync()
{
T savedEntity = default(T);
NetworkRequest <T> request = null;
string entityID = null;;
JToken idToken = JObject.FromObject(entity) ["_id"];
if (idToken != null &&
!String.IsNullOrEmpty(idToken.ToString()))
{
entityID = idToken.ToString();
request = Client.NetworkFactory.buildUpdateRequest(Collection, entity, entityID);
}
else
{
request = Client.NetworkFactory.buildCreateRequest(Collection, entity);
}
switch (Policy)
{
case WritePolicy.FORCE_LOCAL:
// sync
PendingWriteAction pendingAction = PendingWriteAction.buildFromRequest(request);
string saveModeLocal = request.RequestMethod;
string tempIdLocal = null;
if (String.Equals("POST", saveModeLocal))
{
tempIdLocal = PrepareCacheSave(ref entity);
savedEntity = Cache.Save(entity);
pendingAction.entityId = tempIdLocal;
}
else
{
savedEntity = Cache.Update(entity);
}
SyncQueue.Enqueue(pendingAction);
break;
case WritePolicy.FORCE_NETWORK:
// network
savedEntity = await request.ExecuteAsync();
break;
case WritePolicy.NETWORK_THEN_LOCAL:
// cache
string saveModeNetworkThenLocal = request.RequestMethod;
string tempIdNetworkThenLocal = null;
if (String.Equals("POST", saveModeNetworkThenLocal))
{
tempIdNetworkThenLocal = PrepareCacheSave(ref entity);
Cache.Save(entity);
}
else
{
Cache.Update(entity);
}
// network save
savedEntity = await request.ExecuteAsync();
if (tempIdNetworkThenLocal != null)
{
Cache.UpdateCacheSave(savedEntity, tempIdNetworkThenLocal);
}
break;
case WritePolicy.LOCAL_THEN_NETWORK:
string saveModeLocalThenNetwork = request.RequestMethod;
// cache
if (String.Equals("POST", saveModeLocalThenNetwork))
{
entityID = PrepareCacheSave(ref entity);
savedEntity = Cache.Save(entity);
}
else
{
savedEntity = Cache.Update(entity);
}
KinveyException kinveyException = null;
Exception exception = null;
try
{
// network save
savedEntity = await request.ExecuteAsync();
}
catch (KinveyException kinveyEx)
{
kinveyException = kinveyEx;
}
catch (Exception ex)
{
exception = ex;
}
if (kinveyException != null || exception != null)
{
// if the network request fails, save data to sync queue
var localPendingAction = PendingWriteAction.buildFromRequest(request);
localPendingAction.entityId = entityID;
SyncQueue.Enqueue(localPendingAction);
if (kinveyException != null)
{
throw kinveyException;
}
}
else
{
Cache.UpdateCacheSave(savedEntity, entityID);
}
break;
default:
throw new KinveyException(EnumErrorCategory.ERROR_GENERAL, EnumErrorCode.ERROR_GENERAL, "Invalid write policy");
}
return(savedEntity);
}
public NetworkRequest <T> BuildGetAggregateRequest <T>(string collectionName, EnumReduceFunction reduceFunction, string query, string groupField, string aggregateField)
{
string REST_PATH = "appdata/{appKey}/{collectionName}/_group";
var urlParameters = new Dictionary <string, string>();
urlParameters.Add("appKey", ((KinveyClientRequestInitializer)client.RequestInitializer).AppKey);
urlParameters.Add("collectionName", collectionName);
JObject keyval = new JObject();
if (!String.IsNullOrEmpty(groupField))
{
keyval.Add(groupField, true);
}
JObject initialval = new JObject();
JObject httpBodyContent = new JObject();
httpBodyContent.Add("key", keyval);
string reduce = String.Empty;
switch (reduceFunction)
{
case EnumReduceFunction.REDUCE_FUNCTION_SUM:
initialval.Add("result", 0);
reduce = $"function(doc,out){{ out.result += doc.{aggregateField}; }}";
break;
case EnumReduceFunction.REDUCE_FUNCTION_MIN:
initialval.Add("result", Int32.MaxValue);
reduce = $"function(doc,out){{ out.result = Math.min(out.result, doc.{aggregateField}); }}";
break;
case EnumReduceFunction.REDUCE_FUNCTION_MAX:
initialval.Add("result", Int32.MinValue);
reduce = $"function(doc,out){{ out.result = Math.max(out.result, doc.{aggregateField}); }}";
break;
case EnumReduceFunction.REDUCE_FUNCTION_AVERAGE:
initialval.Add("result", 0);
initialval.Add("count", 0);
reduce = $"function(doc,out){{ out.result = (((out.result * out.count) + doc.{aggregateField}) / (out.count += 1)); }}";
break;
default:
// TODO throw new KinveyException()
break;
}
httpBodyContent.Add("initial", initialval);
httpBodyContent.Add("reduce", reduce);
if (!String.IsNullOrEmpty(query))
{
const char CHAR_CURLY_BRACE_OPENING = '{';
const char CHAR_CURLY_BRACE_CLOSING = '}';
const char CHAR_COLON = ':';
const char CHAR_DOUBLE_QUOTATION_MARK = '"';
JObject condition = new JObject();
query = query.TrimStart(CHAR_CURLY_BRACE_OPENING).TrimEnd(CHAR_CURLY_BRACE_CLOSING);
string[] cond = query.Split(CHAR_COLON);
cond[0] = cond[0].TrimStart(CHAR_DOUBLE_QUOTATION_MARK).TrimEnd(CHAR_DOUBLE_QUOTATION_MARK);
cond[1] = cond[1].TrimStart(CHAR_DOUBLE_QUOTATION_MARK).TrimEnd(CHAR_DOUBLE_QUOTATION_MARK);
condition.Add(cond[0], cond[1]);
httpBodyContent.Add("condition", condition);
}
NetworkRequest <T> findAggregateQuery = new NetworkRequest <T>(client, "POST", REST_PATH, httpBodyContent, urlParameters);
client.InitializeRequest(findAggregateQuery);
return(findAggregateQuery);
}
/// <summary>
/// Perfoms finding in backend.
/// </summary>
/// <returns>The async task with the request results.</returns>
protected async Task <NetworkReadResponse <T> > PerformNetworkFind()
{
try
{
string mongoQuery = this.BuildMongoQuery();
bool isQueryModifierPresent = !string.IsNullOrEmpty(mongoQuery) ?
mongoQuery.Contains(Constants.STR_QUERY_MODIFIER_SKIP) ||
mongoQuery.Contains(Constants.STR_QUERY_MODIFIER_LIMIT) :
false;
if (DeltaSetFetchingEnabled && !isQueryModifierPresent)
{
QueryCacheItem queryCacheItem = Client.CacheManager.GetQueryCacheItem(Collection, mongoQuery, null);
if (!Cache.IsCacheEmpty())
{
if (queryCacheItem != null && !string.IsNullOrEmpty(queryCacheItem.lastRequest))
{
// Able to perform server-side delta set fetch
NetworkRequest <DeltaSetResponse <T> > request = Client.NetworkFactory.BuildDeltaSetRequest <DeltaSetResponse <T> >(queryCacheItem.collectionName, queryCacheItem.lastRequest, queryCacheItem.query);
DeltaSetResponse <T> results = null;
try
{
results = await request.ExecuteAsync().ConfigureAwait(false);
}
catch (KinveyException ke)
{
// Regardless of the error, remove the QueryCacheItem if it exists
Client.CacheManager.DeleteQueryCacheItem(queryCacheItem);
switch (ke.StatusCode)
{
case 400: // ResultSetSizeExceeded or ParameterValueOutOfRange
if (ke.Error.Equals(Constants.STR_ERROR_BACKEND_RESULT_SET_SIZE_EXCEEDED))
{
// This means that there are greater than 10k items in the delta set.
// Clear QueryCache table, perform a regular GET
// and capture x-kinvey-request-start time
return(await PerformNetworkInitialDeltaGet(mongoQuery).ConfigureAwait(false));
}
else if (ke.Error.Equals(Constants.STR_ERROR_BACKEND_PARAMETER_VALUE_OUT_OF_RANGE))
{
// This means that the last sync time for delta set is too far back, or
// the backend was enabled for delta set after the client was enabled
// and already attempted a GET.
// Perform regular GET and capture x-kinvey-request-start time
return(await PerformNetworkInitialDeltaGet(mongoQuery).ConfigureAwait(false));
}
break;
case 403: // MissingConfiguration
if (ke.Error.Equals(Constants.STR_ERROR_BACKEND_MISSING_CONFIGURATION))
{
// This means that server-side delta sync
// is not enabled - should perform a regular
// GET and capture x-kinvey-request-start time
return(await PerformNetworkInitialDeltaGet(mongoQuery).ConfigureAwait(false));
}
break;
default:
// This is not a delta sync specific error
throw;
}
}
// With the _deltaset endpoint result from the server:
// 1 - Apply deleted set to local cache
List <string> listDeletedIDs = new List <string>();
foreach (var deletedItem in results.Deleted)
{
listDeletedIDs.Add(deletedItem.ID);
}
Cache.DeleteByIDs(listDeletedIDs);
// 2 - Apply changed set to local cache
Cache.RefreshCache(results.Changed);
// 3 - Update the last request time for this combination
// of collection:query
queryCacheItem.lastRequest = request.RequestStartTime;
Client.CacheManager.SetQueryCacheItem(queryCacheItem);
// 4 - Return network results
return(new NetworkReadResponse <T>(results.Changed, results.Changed.Count, true));
}
else
{
// Perform regular GET and capture x-kinvey-request-start time
return(await PerformNetworkInitialDeltaGet(mongoQuery).ConfigureAwait(false));
}
}
else
{
// Perform regular GET and capture x-kinvey-request-start time
return(await PerformNetworkInitialDeltaGet(mongoQuery, queryCacheItem).ConfigureAwait(false));
}
}
return(await PerformNetworkGet(mongoQuery).ConfigureAwait(false));
}
catch (KinveyException)
{
throw;
}
catch (Exception e)
{
throw new KinveyException(EnumErrorCategory.ERROR_DATASTORE_NETWORK,
EnumErrorCode.ERROR_GENERAL,
"Error in FindAsync() for network results.",
e);
}
}