Revert using fasthttp library to net/http

CHANGELOG.md

@@ -6,6 +6,7 @@
 
 - [#2137](https://github.com/influxdata/telegraf/pull/2137): Added userstats to mysql input plugin.
 - [#2179](https://github.com/influxdata/telegraf/pull/2179): Added more InnoDB metric to MySQL plugin.
+- [#2251](https://github.com/influxdata/telegraf/pull/2251): InfluxDB output: use own client for improved through-put and less allocations.
 
 ### Bugfixes
 

Godeps

@@ -50,8 +50,6 @@ github.com/shirou/gopsutil 1516eb9ddc5e61ba58874047a98f8b44b5e585e8
 github.com/soniah/gosnmp 3fe3beb30fa9700988893c56a63b1df8e1b68c26
 github.com/streadway/amqp b4f3ceab0337f013208d31348b578d83c0064744
 github.com/stretchr/testify 1f4a1643a57e798696635ea4c126e9127adb7d3c
-github.com/valyala/bytebufferpool e746df99fe4a3986f4d4f79e13c1e0117ce9c2f7
-github.com/valyala/fasthttp 2f4876aaf2b591786efc9b49f34b86ad44c25074
 github.com/vjeantet/grok 83bfdfdfd1a8146795b28e547a8e3c8b28a466c2
 github.com/wvanbergen/kafka bc265fedb9ff5b5c5d3c0fdcef4a819b3523d3ee
 github.com/wvanbergen/kazoo-go 0f768712ae6f76454f987c3356177e138df258f8

plugins/inputs/http_listener/http_listener.go

@@ -300,9 +300,6 @@ func (h *HTTPListener) serveWrite(res http.ResponseWriter, req *http.Request) {
 }
 
 func (h *HTTPListener) parse(b []byte, t time.Time) error {
-	if !bytes.HasSuffix(b, []byte("\n")) {
-		b = append(b, '\n')
-	}
 	metrics, err := h.parser.ParseWithDefaultTime(b, t)
 
 	for _, m := range metrics {

plugins/outputs/influxdb/client/http.go

@@ -1,15 +1,15 @@
 package client
 
 import (
+	"bytes"
 	"crypto/tls"
-	"encoding/base64"
 	"encoding/json"
 	"fmt"
 	"io"
+	"io/ioutil"
+	"net/http"
 	"net/url"
 	"time"
-
-	"github.com/valyala/fasthttp"
 )
 
 var (
@@ -40,13 +40,15 @@ func NewHTTP(config HTTPConfig, defaultWP WriteParams) (Client, error) {
 		return nil, fmt.Errorf("config.URL scheme must be http(s), got %s", u.Scheme)
 	}
 
-	wu := writeURL(u, defaultWP)
 	return &httpClient{
-		writeURL: []byte(wu),
+		writeURL: writeURL(u, defaultWP),
 		config:   config,
 		url:      u,
-		client: &fasthttp.Client{
+		client: &http.Client{
-			TLSConfig: config.TLSConfig,
+			Timeout: config.Timeout,
+			Transport: &http.Transport{
+				TLSClientConfig: config.TLSConfig,
+			},
 		},
 	}, nil
 }
@@ -58,8 +60,13 @@ type HTTPConfig struct {
 	// UserAgent sets the User-Agent header.
 	UserAgent string
 
-	// Timeout is the time to wait for a response to each HTTP request (writes
+	// Timeout specifies a time limit for requests made by this
-	// and queries).
+	// Client. The timeout includes connection time, any
+	// redirects, and reading the response body. The timer remains
+	// running after Get, Head, Post, or Do return and will
+	// interrupt reading of the Response.Body.
+	//
+	// A Timeout of zero means no timeout.
 	Timeout time.Duration
 
 	// Username is the basic auth username for the server.
@@ -92,24 +99,27 @@ func (r *Response) Error() error {
 }
 
 type httpClient struct {
-	writeURL []byte
+	writeURL string
 	config   HTTPConfig
-	client   *fasthttp.Client
+	client   *http.Client
 	url      *url.URL
 }
 
 func (c *httpClient) Query(command string) error {
-	req := c.makeRequest()
+	req, err := c.makeRequest(queryURL(c.url, command), bytes.NewReader([]byte("")))
-	req.Header.SetRequestURI(queryURL(c.url, command))
+	if err != nil {
-
+		return err
-	return c.doRequest(req, fasthttp.StatusOK)
+	}
+	return c.doRequest(req, http.StatusOK)
 }
 
 func (c *httpClient) Write(b []byte) (int, error) {
-	req := c.makeWriteRequest(len(b), c.writeURL)
+	req, err := c.makeWriteRequest(bytes.NewReader(b), len(b), c.writeURL)
-	req.SetBody(b)
+	if err != nil {
+		return 0, nil
+	}
 
-	err := c.doRequest(req, fasthttp.StatusNoContent)
+	err = c.doRequest(req, http.StatusNoContent)
 	if err == nil {
 		return len(b), nil
 	}
@@ -117,10 +127,12 @@ func (c *httpClient) Write(b []byte) (int, error) {
 }
 
 func (c *httpClient) WriteWithParams(b []byte, wp WriteParams) (int, error) {
-	req := c.makeWriteRequest(len(b), []byte(writeURL(c.url, wp)))
+	req, err := c.makeWriteRequest(bytes.NewReader(b), len(b), writeURL(c.url, wp))
-	req.SetBody(b)
+	if err != nil {
+		return 0, nil
+	}
 
-	err := c.doRequest(req, fasthttp.StatusNoContent)
+	err = c.doRequest(req, http.StatusNoContent)
 	if err == nil {
 		return len(b), nil
 	}
@@ -128,10 +140,12 @@ func (c *httpClient) WriteWithParams(b []byte, wp WriteParams) (int, error) {
 }
 
 func (c *httpClient) WriteStream(r io.Reader, contentLength int) (int, error) {
-	req := c.makeWriteRequest(contentLength, c.writeURL)
+	req, err := c.makeWriteRequest(r, contentLength, c.writeURL)
-	req.SetBodyStream(r, contentLength)
+	if err != nil {
+		return 0, nil
+	}
 
-	err := c.doRequest(req, fasthttp.StatusNoContent)
+	err = c.doRequest(req, http.StatusNoContent)
 	if err == nil {
 		return contentLength, nil
 	}
@@ -143,10 +157,12 @@ func (c *httpClient) WriteStreamWithParams(
 	contentLength int,
 	wp WriteParams,
 ) (int, error) {
-	req := c.makeWriteRequest(contentLength, []byte(writeURL(c.url, wp)))
+	req, err := c.makeWriteRequest(r, contentLength, writeURL(c.url, wp))
-	req.SetBodyStream(r, contentLength)
+	if err != nil {
+		return 0, nil
+	}
 
-	err := c.doRequest(req, fasthttp.StatusNoContent)
+	err = c.doRequest(req, http.StatusNoContent)
 	if err == nil {
 		return contentLength, nil
 	}
@@ -154,24 +170,27 @@ func (c *httpClient) WriteStreamWithParams(
 }
 
 func (c *httpClient) doRequest(
-	req *fasthttp.Request,
+	req *http.Request,
 	expectedCode int,
 ) error {
-	resp := fasthttp.AcquireResponse()
+	resp, err := c.client.Do(req)
+	if err != nil {
+		return err
+	}
 
-	err := c.client.DoTimeout(req, resp, c.config.Timeout)
+	code := resp.StatusCode
-
-	code := resp.StatusCode()
 	// If it's a "no content" response, then release and return nil
-	if code == fasthttp.StatusNoContent {
+	if code == http.StatusNoContent {
-		fasthttp.ReleaseResponse(resp)
-		fasthttp.ReleaseRequest(req)
 		return nil
 	}
 
 	// not a "no content" response, so parse the result:
 	var response Response
-	decErr := json.Unmarshal(resp.Body(), &response)
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return fmt.Errorf("Fatal error reading body: %s", err)
+	}
+	decErr := json.Unmarshal(body, &response)
 
 	// If we got a JSON decode error, send that back
 	if decErr != nil {
@@ -184,35 +203,37 @@ func (c *httpClient) doRequest(
 			code, expectedCode, response.Error())
 	}
 
-	fasthttp.ReleaseResponse(resp)
-	fasthttp.ReleaseRequest(req)
-
 	return err
 }
 
 func (c *httpClient) makeWriteRequest(
+	body io.Reader,
 	contentLength int,
-	writeURL []byte,
+	writeURL string,
-) *fasthttp.Request {
+) (*http.Request, error) {
-	req := c.makeRequest()
+	req, err := c.makeRequest(writeURL, body)
-	req.Header.SetContentLength(contentLength)
+	if err != nil {
-	req.Header.SetRequestURIBytes(writeURL)
+		return nil, err
+	}
+	req.Header.Set("Content-Length", fmt.Sprint(contentLength))
 	// TODO
 	// if gzip {
-	// 	req.Header.SetBytesKV([]byte("Content-Encoding"), []byte("gzip"))
+	// 	req.Header.Set("Content-Encoding", "gzip")
 	// }
-	return req
+	return req, nil
 }
 
-func (c *httpClient) makeRequest() *fasthttp.Request {
+func (c *httpClient) makeRequest(uri string, body io.Reader) (*http.Request, error) {
-	req := fasthttp.AcquireRequest()
+	req, err := http.NewRequest("POST", uri, body)
-	req.Header.SetContentTypeBytes([]byte("text/plain"))
+	if err != nil {
-	req.Header.SetMethodBytes([]byte("POST"))
+		return nil, err
-	req.Header.SetUserAgent(c.config.UserAgent)
-	if c.config.Username != "" && c.config.Password != "" {
-		req.Header.Set("Authorization", "Basic "+basicAuth(c.config.Username, c.config.Password))
 	}
-	return req
+	req.Header.Set("Content-Type", "text/plain")
+	req.Header.Set("User-Agent", c.config.UserAgent)
+	if c.config.Username != "" && c.config.Password != "" {
+		req.SetBasicAuth(c.config.Username, c.config.Password)
+	}
+	return req, nil
 }
 
 func (c *httpClient) Close() error {
@@ -246,13 +267,3 @@ func queryURL(u *url.URL, command string) string {
 	u.Path = "query"
 	return u.String()
 }
-
-// See 2 (end of page 4) http://www.ietf.org/rfc/rfc2617.txt
-// "To receive authorization, the httpClient sends the userid and password,
-// separated by a single colon (":") character, within a base64
-// encoded string in the credentials."
-// It is not meant to be urlencoded.
-func basicAuth(username, password string) string {
-	auth := username + ":" + password
-	return base64.StdEncoding.EncodeToString([]byte(auth))
-}

plugins/outputs/influxdb/influxdb.go

@@ -99,8 +99,8 @@ func (i *InfluxDB) Connect() error {
 			config := client.UDPConfig{
 				URL:         u,
 				PayloadSize: i.UDPPayload,
-			c, err := client.NewUDP(config)
 			}
+			c, err := client.NewUDP(config)
 			if err != nil {
 				return fmt.Errorf("Error creating UDP Client [%s]: %s", u, err)
 			}
@@ -154,8 +154,8 @@ func (i *InfluxDB) Write(metrics []telegraf.Metric) error {
 	bufsize := 0
 	for _, m := range metrics {
 		bufsize += m.Len()
-	r := metric.NewReader(metrics)
 	}
+	r := metric.NewReader(metrics)
 
 	// This will get set to nil if a successful write occurs
 	err := fmt.Errorf("Could not write to any InfluxDB server in cluster")
@@ -163,9 +163,6 @@ func (i *InfluxDB) Write(metrics []telegraf.Metric) error {
 	p := rand.Perm(len(i.clients))
 	for _, n := range p {
 		if _, e := i.clients[n].WriteStream(r, bufsize); e != nil {
-			// Log write failure:
-			log.Printf("E! InfluxDB Output Error: %s", e)
-
 			// If the database was not found, try to recreate it:
 			if strings.Contains(e.Error(), "database not found") {
 				if errc := i.clients[n].Query("CREATE DATABASE  " + i.Database); errc != nil {

plugins/outputs/influxdb/influxdb_test.go

@@ -140,3 +140,27 @@ func TestHTTPError_DatabaseNotFound(t *testing.T) {
 	require.Error(t, err)
 	require.NoError(t, i.Close())
 }
+
+// field type conflict does not return an error, instead we
+func TestHTTPError_FieldTypeConflict(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		switch r.URL.Path {
+		case "/write":
+			w.WriteHeader(http.StatusNotFound)
+			w.Header().Set("Content-Type", "application/json")
+			fmt.Fprintln(w, `{"results":[{}],"error":"field type conflict: input field \"value\" on measurement \"test\" is type integer, already exists as type float dropped=1"}`)
+		}
+	}))
+	defer ts.Close()
+
+	i := InfluxDB{
+		URLs:     []string{ts.URL},
+		Database: "test",
+	}
+
+	err := i.Connect()
+	require.NoError(t, err)
+	err = i.Write(testutil.MockMetrics())
+	require.NoError(t, err)
+	require.NoError(t, i.Close())
+}