Golang Request.Series方法代碼示例

//.........這裏部分代碼省略.........
		if err != nil {
			httpError(w, "error authorizing query: "+err.Error(), pretty, http.StatusUnauthorized)
			return
		}
	}

	// Parse chunk size. Use default if not provided or unparsable.
	chunked := (q.Get("chunked") == "true")
	chunkSize := DefaultChunkSize
	if chunked {
		if n, err := strconv.ParseInt(q.Get("chunk_size"), 10, 64); err == nil {
			chunkSize = int(n)
		}
	}

	// Make sure if the client disconnects we signal the query to abort
	closing := make(chan struct{})
	if notifier, ok := w.(http.CloseNotifier); ok {
		notify := notifier.CloseNotify()
		go func() {
			<-notify
			close(closing)
		}()
	}

	// Execute query.
	w.Header().Add("content-type", "application/json")
	results, err := h.QueryExecutor.ExecuteQuery(query, db, chunkSize, closing)

	if err != nil {
		w.WriteHeader(http.StatusInternalServerError)
		return
	}

	// if we're not chunking, this will be the in memory buffer for all results before sending to client
	resp := Response{Results: make([]*influxql.Result, 0)}

	// Status header is OK once this point is reached.
	w.WriteHeader(http.StatusOK)

	// pull all results from the channel
	for r := range results {
		// Ignore nil results.
		if r == nil {
			continue
		}

		// if requested, convert result timestamps to epoch
		if epoch != "" {
			convertToEpoch(r, epoch)
		}

		// Write out result immediately if chunked.
		if chunked {
			n, _ := w.Write(MarshalJSON(Response{
				Results: []*influxql.Result{r},
			}, pretty))
			h.statMap.Add(statQueryRequestBytesTransmitted, int64(n))
			w.(http.Flusher).Flush()
			continue
		}

		// It's not chunked so buffer results in memory.
		// Results for statements need to be combined together.
		// We need to check if this new result is for the same statement as
		// the last result, or for the next statement
		l := len(resp.Results)
		if l == 0 {
			resp.Results = append(resp.Results, r)
		} else if resp.Results[l-1].StatementID == r.StatementID {
			cr := resp.Results[l-1]
			rowsMerged := 0
			if len(cr.Series) > 0 {
				lastSeries := cr.Series[len(cr.Series)-1]

				for _, row := range r.Series {
					if !lastSeries.SameSeries(row) {
						// Next row is for a different series than last.
						break
					}
					// Values are for the same series, so append them.
					lastSeries.Values = append(lastSeries.Values, row.Values...)
					rowsMerged++
				}
			}

			// Append remaining rows as new rows.
			r.Series = r.Series[rowsMerged:]
			cr.Series = append(cr.Series, r.Series...)
		} else {
			resp.Results = append(resp.Results, r)
		}
	}

	// If it's not chunked we buffered everything in memory, so write it out
	if !chunked {
		n, _ := w.Write(MarshalJSON(resp, pretty))
		h.statMap.Add(statQueryRequestBytesTransmitted, int64(n))
	}
}

//.........這裏部分代碼省略.........
			select {
			case <-done:
			case <-notify:
				close(closing)
			}
		}()
	} else {
		defer close(closing)
	}

	// Execute query.
	w.Header().Add("Connection", "close")
	w.Header().Add("content-type", "application/json")
	results := h.QueryExecutor.ExecuteQuery(query, db, chunkSize, closing)

	// if we're not chunking, this will be the in memory buffer for all results before sending to client
	resp := Response{Results: make([]*influxql.Result, 0)}

	// Status header is OK once this point is reached.
	w.WriteHeader(http.StatusOK)

	// pull all results from the channel
	rows := 0
	for r := range results {
		// Ignore nil results.
		if r == nil {
			continue
		}

		// if requested, convert result timestamps to epoch
		if epoch != "" {
			convertToEpoch(r, epoch)
		}

		// Write out result immediately if chunked.
		if chunked {
			n, _ := w.Write(MarshalJSON(Response{
				Results: []*influxql.Result{r},
			}, pretty))
			if !pretty {
				w.Write([]byte("\n"))
			}
			h.statMap.Add(statQueryRequestBytesTransmitted, int64(n))
			w.(http.Flusher).Flush()
			continue
		}

		// Limit the number of rows that can be returned in a non-chunked response.
		// This is to prevent the server from going OOM when returning a large response.
		// If you want to return more than the default chunk size, then use chunking
		// to process multiple blobs.
		rows += len(r.Series)
		if h.rowLimit > 0 && rows > h.rowLimit {
			break
		}

		// It's not chunked so buffer results in memory.
		// Results for statements need to be combined together.
		// We need to check if this new result is for the same statement as
		// the last result, or for the next statement
		l := len(resp.Results)
		if l == 0 {
			resp.Results = append(resp.Results, r)
		} else if resp.Results[l-1].StatementID == r.StatementID {
			if r.Err != nil {
				resp.Results[l-1] = r
				continue
			}

			cr := resp.Results[l-1]
			rowsMerged := 0
			if len(cr.Series) > 0 {
				lastSeries := cr.Series[len(cr.Series)-1]

				for _, row := range r.Series {
					if !lastSeries.SameSeries(row) {
						// Next row is for a different series than last.
						break
					}
					// Values are for the same series, so append them.
					lastSeries.Values = append(lastSeries.Values, row.Values...)
					rowsMerged++
				}
			}

			// Append remaining rows as new rows.
			r.Series = r.Series[rowsMerged:]
			cr.Series = append(cr.Series, r.Series...)
			cr.Messages = append(cr.Messages, r.Messages...)
		} else {
			resp.Results = append(resp.Results, r)
		}
	}

	// If it's not chunked we buffered everything in memory, so write it out
	if !chunked {
		n, _ := w.Write(MarshalJSON(resp, pretty))
		h.statMap.Add(statQueryRequestBytesTransmitted, int64(n))
	}
}

//.........這裏部分代碼省略.........
		}()
	} else {
		defer close(closing)
	}

	// Execute query.
	w.Header().Add("Connection", "close")
	w.Header().Add("Content-Type", "application/json")
	results := h.QueryExecutor.ExecuteQuery(query, influxql.ExecutionOptions{
		Database:  db,
		ChunkSize: chunkSize,
		ReadOnly:  r.Method == "GET",
		NodeID:    nodeID,
	}, closing)

	// if we're not chunking, this will be the in memory buffer for all results before sending to client
	resp := Response{Results: make([]*influxql.Result, 0)}

	// Status header is OK once this point is reached.
	h.writeHeader(w, http.StatusOK)

	// pull all results from the channel
	rows := 0
	for r := range results {
		// Ignore nil results.
		if r == nil {
			continue
		}

		// if requested, convert result timestamps to epoch
		if epoch != "" {
			convertToEpoch(r, epoch)
		}

		// Write out result immediately if chunked.
		if chunked {
			n, _ := w.Write(MarshalJSON(Response{
				Results: []*influxql.Result{r},
			}, pretty))
			if !pretty {
				w.Write([]byte("\n"))
			}
			atomic.AddInt64(&h.stats.QueryRequestBytesTransmitted, int64(n))
			w.(http.Flusher).Flush()
			continue
		}

		// Limit the number of rows that can be returned in a non-chunked response.
		// This is to prevent the server from going OOM when returning a large response.
		// If you want to return more than the default chunk size, then use chunking
		// to process multiple blobs.
		rows += len(r.Series)
		if h.Config.MaxRowLimit > 0 && rows > h.Config.MaxRowLimit {
			break
		}

		// It's not chunked so buffer results in memory.
		// Results for statements need to be combined together.
		// We need to check if this new result is for the same statement as
		// the last result, or for the next statement
		l := len(resp.Results)
		if l == 0 {
			resp.Results = append(resp.Results, r)
		} else if resp.Results[l-1].StatementID == r.StatementID {
			if r.Err != nil {
				resp.Results[l-1] = r
				continue
			}

			cr := resp.Results[l-1]
			rowsMerged := 0
			if len(cr.Series) > 0 {
				lastSeries := cr.Series[len(cr.Series)-1]

				for _, row := range r.Series {
					if !lastSeries.SameSeries(row) {
						// Next row is for a different series than last.
						break
					}
					// Values are for the same series, so append them.
					lastSeries.Values = append(lastSeries.Values, row.Values...)
					rowsMerged++
				}
			}

			// Append remaining rows as new rows.
			r.Series = r.Series[rowsMerged:]
			cr.Series = append(cr.Series, r.Series...)
			cr.Messages = append(cr.Messages, r.Messages...)
		} else {
			resp.Results = append(resp.Results, r)
		}
	}

	// If it's not chunked we buffered everything in memory, so write it out
	if !chunked {
		n, _ := w.Write(MarshalJSON(resp, pretty))
		atomic.AddInt64(&h.stats.QueryRequestBytesTransmitted, int64(n))
	}
}

//.........這裏部分代碼省略.........
		w.Flush()
	}

	// pull all results from the channel
	rows := 0
	for r := range results {
		// Ignore nil results.
		if r == nil {
			continue
		}

		// if requested, convert result timestamps to epoch
		if epoch != "" {
			convertToEpoch(r, epoch)
		}

		// Write out result immediately if chunked.
		if chunked {
			n, _ := rw.WriteResponse(Response{
				Results: []*influxql.Result{r},
			})
			atomic.AddInt64(&h.stats.QueryRequestBytesTransmitted, int64(n))
			w.(http.Flusher).Flush()
			continue
		}

		// Limit the number of rows that can be returned in a non-chunked
		// response.  This is to prevent the server from going OOM when
		// returning a large response.  If you want to return more than the
		// default chunk size, then use chunking to process multiple blobs.
		// Iterate through the series in this result to count the rows and
		// truncate any rows we shouldn't return.
		if h.Config.MaxRowLimit > 0 {
			for i, series := range r.Series {
				n := h.Config.MaxRowLimit - rows
				if n < len(series.Values) {
					// We have reached the maximum number of values. Truncate
					// the values within this row.
					series.Values = series.Values[:n]
					// Since this was truncated, it will always be a partial return.
					// Add this so the client knows we truncated the response.
					series.Partial = true
				}
				rows += len(series.Values)

				if rows >= h.Config.MaxRowLimit {
					// Drop any remaining series since we have already reached the row limit.
					if i < len(r.Series) {
						r.Series = r.Series[:i+1]
					}
					break
				}
			}
		}

		// It's not chunked so buffer results in memory.
		// Results for statements need to be combined together.
		// We need to check if this new result is for the same statement as
		// the last result, or for the next statement
		l := len(resp.Results)
		if l == 0 {
			resp.Results = append(resp.Results, r)
		} else if resp.Results[l-1].StatementID == r.StatementID {
			if r.Err != nil {
				resp.Results[l-1] = r
				continue