Fix case when cancellation token was requested but query was not canceled

Author: Mykyta Yarovyi

trino-csharp/Trino.Client/StatementClientV1.cs

@@ -284,65 +284,80 @@ private async Task<bool> Cancel(QueryCancellationReason reason = QueryCancellati
         /// </summary>
         internal async Task<ResponseQueueStatement> Advance()
         {
-            if (this.Statement.nextUri.Contains("/executing"))
+            try
             {
-                if (this.Statement.nextUri.Contains("?"))
+                if (this.Statement.nextUri.Contains("/executing"))
                 {
-                    this.Statement.nextUri += $"&targetResultSize={Constants.MaxTargetResultSizeMB}MB";
+                    if (this.Statement.nextUri.Contains("?"))
+                    {
+                        this.Statement.nextUri += $"&targetResultSize={Constants.MaxTargetResultSizeMB}MB";
+                    }
+                    else
+                    {
+                        this.Statement.nextUri += $"?targetResultSize={Constants.MaxTargetResultSizeMB}MB";
+                    }
                 }
-                else
+
+                logger?.LogDebug("Trino: request: {1}", this.Statement.nextUri);
+
+                string responseStr = await this.GetAsync(new Uri(this.Statement.nextUri), OK).ConfigureAwait(false);
+                logger?.LogDebug("Trino: response: {1}", responseStr);
+                QueryResultPage response = JsonConvert.DeserializeObject<QueryResultPage>(responseStr);
+                logger?.LogDebug("Trino: response at {0} msec with state {1}", stopwatch.ElapsedMilliseconds,
+                    response.stats.state);
+
+                // Note, the size is estimated based on the response string size which is not the actual deserialized size.
+                ResponseQueueStatement responseQueueItem = new ResponseQueueStatement(response, responseStr.Length);
+                if (responseQueueItem.Response.error != null)
                 {
-                    this.Statement.nextUri += $"?targetResultSize={Constants.MaxTargetResultSizeMB}MB";
+                    State.StateTransition(TrinoQueryStates.CLIENT_ERROR, TrinoQueryStates.RUNNING);
+                    throw new TrinoException(responseQueueItem.Response.error.message,
+                        responseQueueItem.Response.error);
                 }
-            }
-            logger?.LogDebug("Trino: request: {1}", this.Statement.nextUri);
 
-            string responseStr = await this.GetAsync(new Uri(this.Statement.nextUri), OK).ConfigureAwait(false);
-            logger?.LogDebug("Trino: response: {1}", responseStr);
-            QueryResultPage response = JsonConvert.DeserializeObject<QueryResultPage>(responseStr);
-            logger?.LogDebug("Trino: response at {0} msec with state {1}", stopwatch.ElapsedMilliseconds, response.stats.state);
+                // Make status available
+                this.Statement = responseQueueItem.Response;
 
-            // Note, the size is estimated based on the response string size which is not the actual deserialized size.
-            ResponseQueueStatement responseQueueItem = new ResponseQueueStatement(response, responseStr.Length);
-            if (responseQueueItem.Response.error != null)
-            {
-                State.StateTransition(TrinoQueryStates.CLIENT_ERROR, TrinoQueryStates.RUNNING);
-                throw new TrinoException(responseQueueItem.Response.error.message, responseQueueItem.Response.error);
-            }
-
-            if (cancellationToken.IsCancellationRequested)
-            {
-                await this.Cancel(QueryCancellationReason.USER_CANCEL).ConfigureAwait(false);
-                throw new OperationCanceledException("Cancellation requested");
-            }
+                // If no next URI, the query is completed.
+                if (this.Statement.IsLastPage)
+                {
+                    this.Finish();
+                }
+                else if (this.IsTimeout)
+                {
+                    logger?.LogInformation("Trino: Query timed out queryId:{0}, run time: {1} s, timeout {2} s.",
+                        Statement?.id, this.stopwatch.Elapsed.TotalSeconds,
+                        Session.Properties.ClientRequestTimeout.Value.TotalSeconds);
+                    await this.Cancel(QueryCancellationReason.TIMEOUT).ConfigureAwait(false);
+                    throw new TimeoutException(
+                        $"Trino query ran for {this.stopwatch.Elapsed.TotalSeconds} s, exceeding the timeout of {Session.Properties.Timeout.Value.TotalSeconds} s.");
+                }
 
-            // Make status available
-            this.Statement = responseQueueItem.Response;
+                // Do not wait if the query had data - the next page may be ready immediately.
+                if (!responseQueueItem.Response.HasData && !State.IsFinished && readCount > 4)
+                {
+                    logger?.LogDebug("Trino: No data yet, backoff wait queryId:{0}, delay {1} msec", Statement?.id,
+                        readDelay);
+                    await Task.Delay((int)readDelay).ConfigureAwait(false);
+                    if (readDelay < MAX_READ_DELAY_MSEC)
+                    {
+                        readDelay *= BACKOFF_AMOUNT;
+                    }
+                }
 
-            // If no next URI, the query is completed.
-            if (this.Statement.IsLastPage)
-            {
-                this.Finish();
+                readCount++;
+                return responseQueueItem;
             }
-            else if (this.IsTimeout)
+            catch (Exception)
             {
-                logger?.LogInformation("Trino: Query timed out queryId:{0}, run time: {1} s, timeout {2} s.", Statement?.id, this.stopwatch.Elapsed.TotalSeconds, Session.Properties.ClientRequestTimeout.Value.TotalSeconds);
-                await this.Cancel(QueryCancellationReason.TIMEOUT).ConfigureAwait(false);
-                throw new TimeoutException($"Trino query ran for {this.stopwatch.Elapsed.TotalSeconds} s, exceeding the timeout of {Session.Properties.Timeout.Value.TotalSeconds} s.");
-            }
-
-            // Do not wait if the query had data - the next page may be ready immediately.
-            if (!responseQueueItem.Response.HasData && !State.IsFinished && readCount > 4)
-            {
-                logger?.LogDebug("Trino: No data yet, backoff wait queryId:{0}, delay {1} msec", Statement?.id, readDelay);
-                await Task.Delay((int)readDelay).ConfigureAwait(false);
-                if (readDelay < MAX_READ_DELAY_MSEC)
+                if (cancellationToken.IsCancellationRequested)
                 {
-                    readDelay *= BACKOFF_AMOUNT;
+                    await this.Cancel(QueryCancellationReason.USER_CANCEL).ConfigureAwait(false);
+                    throw new OperationCanceledException("Cancellation requested");
                 }
+
+                throw;
             }
-            readCount++;
-            return responseQueueItem;
         }
 
         /// <summary>