private async Task UnrelatedTransactionsDoNotConflict(IDgraphClient client)
{
var txn1 = client.NewTransaction();
var txn2 = client.NewTransaction();
var personTxn1 = MintAPerson("Alfred Name");
var personTxn2 = MintAPerson("Fank Person");
// Name has term and exact indexes, so these shouldn't clash
var transactionResultTxn1 = await txn1.Mutate(JsonConvert.SerializeObject(personTxn1));
AssertResultIsSuccess(transactionResultTxn1);
personTxn1.Uid = transactionResultTxn1.Value[personTxn1.Uid.Substring(2)];
var transactionResultTxn2 = await txn2.Mutate(JsonConvert.SerializeObject(personTxn2));
AssertResultIsSuccess(transactionResultTxn2);
personTxn2.Uid = transactionResultTxn2.Value[personTxn2.Uid.Substring(2)];
// Can't see the other result
var queryByName = await txn2.QueryWithVars(
FriendQueries.QueryByName,
new Dictionary <string, string> {
{ "$name", personTxn1.Name }
});
AssertResultIsSuccess(queryByName);
queryByName.Value.Should().Be("{\"q\":[]}");
// Cause the mutates can't clash these should be ok
AssertResultIsSuccess(await txn1.Commit());
AssertResultIsSuccess(await txn2.Commit());
// both are there
queryByName = await client.QueryWithVars(
FriendQueries.QueryByName,
new Dictionary <string, string> {
{ "$name", personTxn1.Name }
});
AssertResultIsSuccess(queryByName);
FriendQueries.AssertStringIsPerson(queryByName.Value, personTxn1);
queryByName = await client.QueryWithVars(
FriendQueries.QueryByName,
new Dictionary <string, string> {
{ "$name", personTxn2.Name }
});
AssertResultIsSuccess(queryByName);
FriendQueries.AssertStringIsPerson(queryByName.Value, personTxn2);
}
private async Task DiscardedTransactionsHaveNoEffect(IDgraphClient client)
{
var txn1 = client.NewTransaction();
var person = MintAPerson(nameof(DiscardedTransactionsHaveNoEffect));
var json = JsonConvert.SerializeObject(person);
var transactionResult = await txn1.Mutate(json);
AssertResultIsSuccess(transactionResult);
person.Uid = transactionResult.Value[person.Uid.Substring(2)];
await txn1.Discard();
// Can we see it
var queryByName = await client.QueryWithVars(
FriendQueries.QueryByName,
new Dictionary <string, string> {
{ "$name", person.Name }
});
AssertResultIsSuccess(queryByName);
queryByName.Value.Should().Be("{\"q\":[]}");
// Can we see it in the uid (note that uid queries always return the
// uid ... we are interested if returns the actual person or not)
var queryByUid = await client.Query(FriendQueries.QueryByUid(person.Uid));
AssertResultIsSuccess(queryByUid);
queryByUid.Value.Should().Be($"{{\"q\":[{{\"uid\":\"{person.Uid}\"}}]}}");
}
private async Task ConflictingTransactionsDontBothSucceed(IDgraphClient client)
{
var txn1 = client.NewTransaction();
var txn2 = client.NewTransaction();
var personTxn1 = MintAPerson("Bill Person");
var personTxn2 = MintAPerson("Jane Person");
var transactionResultTxn1 = await txn1.Mutate(JsonConvert.SerializeObject(personTxn1));
AssertResultIsSuccess(transactionResultTxn1);
personTxn1.Uid = transactionResultTxn1.Value[personTxn1.Uid.Substring(2)];
var transactionResultTxn2 = await txn2.Mutate(JsonConvert.SerializeObject(personTxn2));
AssertResultIsSuccess(transactionResultTxn2);
// Name has term and exact indexes, so these clash on 'Person' term
AssertResultIsSuccess(await txn1.Commit());
var txn2Result = await txn2.Commit();
txn2Result.IsFailed.Should().BeTrue();
// Not 100% sure about this quirk. Pretty sure this is how is how
// dgo does it, but I wonder that it should be in an error state?
txn2.TransactionState.Should().Be(TransactionState.Committed);
// txn1 is there
var queryByName = await client.QueryWithVars(
FriendQueries.QueryByName,
new Dictionary <string, string> {
{ "$name", personTxn1.Name }
});
AssertResultIsSuccess(queryByName);
FriendQueries.AssertStringIsPerson(queryByName.Value, personTxn1);
// txn2 had no effect
queryByName = await client.QueryWithVars(
FriendQueries.QueryByName,
new Dictionary <string, string> {
{ "$name", personTxn2.Name }
});
AssertResultIsSuccess(queryByName);
queryByName.Value.Should().Be("{\"q\":[]}");
}
private async Task QueryWithVars(IDgraphClient client)
{
var queryResult = await client.QueryWithVars(
FriendQueries.QueryByName,
new Dictionary <string, string> {
{ "$name", Person3.Name }
});
AssertResultIsSuccess(queryResult, "Query failed");
FriendQueries.AssertStringIsPerson(queryResult.Value, Person3);
}
private async Task ConcurrentUpsertsWorkCorrectly(IDgraphClient client)
{
var user2 = MintAUser("User2");
user2.uid = "_:myBlank";
var predicate = nameof(User.Username);
var username = GraphValue.BuildStringValue(user2.Username);
var json = JsonConvert.SerializeObject(user2);
var tasks = Enumerable.Range(0, 10).
Select(i => client.Upsert(
predicate,
username,
json,
"myBlank"));
var results = await Task.WhenAll(tasks.ToList());
foreach (var result in results)
{
AssertResultIsSuccess(result);
}
// Only one upsert should have acually written a value
results.Select(r => r.Value.existing).Where(exists => !exists).Count().Should().Be(1);
// Only one uid is ever seen
var theUids = results.Select(r => r.Value.node.UID).Distinct();
theUids.Count().Should().Be(1);
// There's only one copy of user2 in the DB
var queryResult = await client.QueryWithVars(
UsersByName,
new Dictionary <string, string> {
{ "$name", user2.Username }
});
AssertResultIsSuccess(queryResult);
var users = (JArray)JObject.Parse(queryResult.Value) ["q"];
users.Count.Should().Be(1);
var user = users[0].ToObject <User>();
string.Format("0x{0:x}", theUids.First()).Should().Be(user.uid);
user.Username.Should().Be(user2.Username);
}