Golang Request.Series Examples

Golang Request.Series - 4 examples found. These are the top rated real world Golang examples of net/http.Request.Series extracted from open source projects. You can rate examples to help us improve the quality of examples.
Example #1
0
// serveQuery parses an incoming query and, if valid, executes the query.
func (h *Handler) serveQuery(w http.ResponseWriter, r *http.Request, user *meta.UserInfo) {
	h.statMap.Add(statQueryRequest, 1)

	q := r.URL.Query()
	pretty := q.Get("pretty") == "true"

	qp := strings.TrimSpace(q.Get("q"))
	if qp == "" {
		httpError(w, `missing required parameter "q"`, pretty, http.StatusBadRequest)
		return
	}

	epoch := strings.TrimSpace(q.Get("epoch"))

	p := influxql.NewParser(strings.NewReader(qp))
	db := q.Get("db")

	// Parse query from query string.
	query, err := p.ParseQuery()
	if err != nil {
		httpError(w, "error parsing query: "+err.Error(), pretty, http.StatusBadRequest)
		return
	}

	// Sanitize statements with passwords.
	for _, s := range query.Statements {
		switch stmt := s.(type) {
		case *influxql.CreateUserStatement:
			sanitize(r, stmt.Password)
		case *influxql.SetPasswordUserStatement:
			sanitize(r, stmt.Password)
		}
	}

	// Check authorization.
	if h.requireAuthentication {
		err = h.QueryExecutor.Authorize(user, query, db)
		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))
	}
}
Example #2
0
// serveQuery parses an incoming query and, if valid, executes the query.
func (h *Handler) serveQuery(w http.ResponseWriter, r *http.Request, user *meta.UserInfo) {
	h.statMap.Add(statQueryRequest, 1)
	defer func(start time.Time) {
		h.statMap.Add(statQueryRequestDuration, time.Since(start).Nanoseconds())
	}(time.Now())

	q := r.URL.Query()
	pretty := q.Get("pretty") == "true"

	qp := strings.TrimSpace(q.Get("q"))
	if qp == "" {
		httpError(w, `missing required parameter "q"`, pretty, http.StatusBadRequest)
		return
	}

	epoch := strings.TrimSpace(q.Get("epoch"))

	p := influxql.NewParser(strings.NewReader(qp))
	db := q.Get("db")

	// Parse query from query string.
	query, err := p.ParseQuery()
	if err != nil {
		httpError(w, "error parsing query: "+err.Error(), pretty, http.StatusBadRequest)
		return
	}

	// Sanitize statements with passwords.
	for _, s := range query.Statements {
		switch stmt := s.(type) {
		case *influxql.CreateUserStatement:
			sanitize(r, stmt.Password)
		case *influxql.SetPasswordUserStatement:
			sanitize(r, stmt.Password)
		}
	}

	// Check authorization.
	if h.requireAuthentication {
		if err := h.QueryAuthorizer.AuthorizeQuery(user, query, db); err != nil {
			if err, ok := err.(meta.ErrAuthorize); ok {
				h.Logger.Printf("unauthorized request | user: %q | query: %q | database %q\n", err.User, err.Query.String(), err.Database)
			}
			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 && int(n) > 0 {
			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 {
		// CloseNotify() is not guaranteed to send a notification when the query
		// is closed. Use this channel to signal that the query is finished to
		// prevent lingering goroutines that may be stuck.
		done := make(chan struct{})
		defer close(done)

		notify := notifier.CloseNotify()
		go func() {
			// Wait for either the request to finish
			// or for the client to disconnect
			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))
	}
}
Example #3
0
// serveQuery parses an incoming query and, if valid, executes the query.
func (h *Handler) serveQuery(w http.ResponseWriter, r *http.Request, user *meta.UserInfo) {
	atomic.AddInt64(&h.stats.QueryRequests, 1)
	defer func(start time.Time) {
		atomic.AddInt64(&h.stats.QueryRequestDuration, time.Since(start).Nanoseconds())
	}(time.Now())

	pretty := r.FormValue("pretty") == "true"
	nodeID, _ := strconv.ParseUint(r.FormValue("node_id"), 10, 64)

	qp := strings.TrimSpace(r.FormValue("q"))
	if qp == "" {
		h.httpError(w, `missing required parameter "q"`, pretty, http.StatusBadRequest)
		return
	}

	epoch := strings.TrimSpace(r.FormValue("epoch"))

	p := influxql.NewParser(strings.NewReader(qp))
	db := r.FormValue("db")

	// Sanitize the request query params so it doesn't show up in the response logger.
	// Do this before anything else so a parsing error doesn't leak passwords.
	sanitize(r)

	// Parse the parameters
	rawParams := r.FormValue("params")
	if rawParams != "" {
		var params map[string]interface{}
		decoder := json.NewDecoder(strings.NewReader(rawParams))
		decoder.UseNumber()
		if err := decoder.Decode(&params); err != nil {
			h.httpError(w, "error parsing query parameters: "+err.Error(), pretty, http.StatusBadRequest)
			return
		}

		// Convert json.Number into int64 and float64 values
		for k, v := range params {
			if v, ok := v.(json.Number); ok {
				var err error
				if strings.Contains(string(v), ".") {
					params[k], err = v.Float64()
				} else {
					params[k], err = v.Int64()
				}

				if err != nil {
					h.httpError(w, "error parsing json value: "+err.Error(), pretty, http.StatusBadRequest)
					return
				}
			}
		}
		p.SetParams(params)
	}

	// Parse query from query string.
	query, err := p.ParseQuery()
	if err != nil {
		h.httpError(w, "error parsing query: "+err.Error(), pretty, http.StatusBadRequest)
		return
	}

	// Check authorization.
	if h.Config.AuthEnabled {
		if err := h.QueryAuthorizer.AuthorizeQuery(user, query, db); err != nil {
			if err, ok := err.(meta.ErrAuthorize); ok {
				h.Logger.Printf("Unauthorized request | user: %q | query: %q | database %q\n", err.User, err.Query.String(), err.Database)
			}
			h.httpError(w, "error authorizing query: "+err.Error(), pretty, http.StatusUnauthorized)
			return
		}
	}

	// Parse chunk size. Use default if not provided or unparsable.
	chunked := (r.FormValue("chunked") == "true")
	chunkSize := DefaultChunkSize
	if chunked {
		if n, err := strconv.ParseInt(r.FormValue("chunk_size"), 10, 64); err == nil && int(n) > 0 {
			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 {
		// CloseNotify() is not guaranteed to send a notification when the query
		// is closed. Use this channel to signal that the query is finished to
		// prevent lingering goroutines that may be stuck.
		done := make(chan struct{})
		defer close(done)

		notify := notifier.CloseNotify()
		go func() {
			// Wait for either the request to finish
			// or for the client to disconnect
			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, 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))
	}
}
Example #4
0
// serveQuery parses an incoming query and, if valid, executes the query.
func (h *Handler) serveQuery(w http.ResponseWriter, r *http.Request, user *meta.UserInfo) {
	atomic.AddInt64(&h.stats.QueryRequests, 1)
	defer func(start time.Time) {
		atomic.AddInt64(&h.stats.QueryRequestDuration, time.Since(start).Nanoseconds())
	}(time.Now())

	// Retrieve the underlying ResponseWriter or initialize our own.
	rw, ok := w.(ResponseWriter)
	if !ok {
		rw = NewResponseWriter(w, r)
	}

	// Retrieve the node id the query should be executed on.
	nodeID, _ := strconv.ParseUint(r.FormValue("node_id"), 10, 64)

	var qr io.Reader
	// Attempt to read the form value from the "q" form value.
	if qp := strings.TrimSpace(r.FormValue("q")); qp != "" {
		qr = strings.NewReader(qp)
	} else if r.MultipartForm != nil && r.MultipartForm.File != nil {
		// If we have a multipart/form-data, try to retrieve a file from 'q'.
		if fhs := r.MultipartForm.File["q"]; len(fhs) > 0 {
			f, err := fhs[0].Open()
			if err != nil {
				h.httpError(rw, err.Error(), http.StatusBadRequest)
				return
			}
			defer f.Close()
			qr = f
		}
	}

	if qr == nil {
		h.httpError(rw, `missing required parameter "q"`, http.StatusBadRequest)
		return
	}

	epoch := strings.TrimSpace(r.FormValue("epoch"))

	p := influxql.NewParser(qr)
	db := r.FormValue("db")

	// Sanitize the request query params so it doesn't show up in the response logger.
	// Do this before anything else so a parsing error doesn't leak passwords.
	sanitize(r)

	// Parse the parameters
	rawParams := r.FormValue("params")
	if rawParams != "" {
		var params map[string]interface{}
		decoder := json.NewDecoder(strings.NewReader(rawParams))
		decoder.UseNumber()
		if err := decoder.Decode(&params); err != nil {
			h.httpError(rw, "error parsing query parameters: "+err.Error(), http.StatusBadRequest)
			return
		}

		// Convert json.Number into int64 and float64 values
		for k, v := range params {
			if v, ok := v.(json.Number); ok {
				var err error
				if strings.Contains(string(v), ".") {
					params[k], err = v.Float64()
				} else {
					params[k], err = v.Int64()
				}

				if err != nil {
					h.httpError(rw, "error parsing json value: "+err.Error(), http.StatusBadRequest)
					return
				}
			}
		}
		p.SetParams(params)
	}

	// Parse query from query string.
	query, err := p.ParseQuery()
	if err != nil {
		h.httpError(rw, "error parsing query: "+err.Error(), http.StatusBadRequest)
		return
	}

	// Check authorization.
	if h.Config.AuthEnabled {
		if err := h.QueryAuthorizer.AuthorizeQuery(user, query, db); err != nil {
			if err, ok := err.(meta.ErrAuthorize); ok {
				h.Logger.Printf("Unauthorized request | user: %q | query: %q | database %q\n", err.User, err.Query.String(), err.Database)
			}
			h.httpError(rw, "error authorizing query: "+err.Error(), http.StatusForbidden)
			return
		}
	}

	// Parse chunk size. Use default if not provided or unparsable.
	chunked := r.FormValue("chunked") == "true"
	chunkSize := DefaultChunkSize
	if chunked {
		if n, err := strconv.ParseInt(r.FormValue("chunk_size"), 10, 64); err == nil && int(n) > 0 {
			chunkSize = int(n)
		}
	}

	// Parse whether this is an async command.
	async := r.FormValue("async") == "true"

	opts := influxql.ExecutionOptions{
		Database:  db,
		ChunkSize: chunkSize,
		ReadOnly:  r.Method == "GET",
		NodeID:    nodeID,
	}

	// Make sure if the client disconnects we signal the query to abort
	var closing chan struct{}
	if !async {
		closing = make(chan struct{})
		if notifier, ok := w.(http.CloseNotifier); ok {
			// CloseNotify() is not guaranteed to send a notification when the query
			// is closed. Use this channel to signal that the query is finished to
			// prevent lingering goroutines that may be stuck.
			done := make(chan struct{})
			defer close(done)

			notify := notifier.CloseNotify()
			go func() {
				// Wait for either the request to finish
				// or for the client to disconnect
				select {
				case <-done:
				case <-notify:
					close(closing)
				}
			}()
			opts.AbortCh = done
		} else {
			defer close(closing)
		}
	}

	// Execute query.
	rw.Header().Add("Connection", "close")
	results := h.QueryExecutor.ExecuteQuery(query, opts, closing)

	// If we are running in async mode, open a goroutine to drain the results
	// and return with a StatusNoContent.
	if async {
		go h.async(query, results)
		h.writeHeader(w, http.StatusNoContent)
		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.
	// Attempt to flush the header immediately so the client gets the header information
	// and knows the query was accepted.
	h.writeHeader(rw, http.StatusOK)
	if w, ok := w.(http.Flusher); ok {
		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
			}

			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...)
			cr.Partial = r.Partial
		} else {
			resp.Results = append(resp.Results, r)
		}

		// Drop out of this loop and do not process further results when we hit the row limit.
		if h.Config.MaxRowLimit > 0 && rows >= h.Config.MaxRowLimit {
			// If the result is marked as partial, remove that partial marking
			// here. While the series is partial and we would normally have
			// tried to return the rest in the next chunk, we are not using
			// chunking and are truncating the series so we don't want to
			// signal to the client that we plan on sending another JSON blob
			// with another result.  The series, on the other hand, still
			// returns partial true if it was truncated or had more data to
			// send in a future chunk.
			r.Partial = false
			break
		}
	}

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