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Use chunked transfer encoding in InfluxDB output (#3307)

This commit is contained in:
Daniel Nelson 2017-10-05 16:14:21 -07:00 committed by GitHub
parent 6e1fa559a3
commit cce40c515a
6 changed files with 19 additions and 214 deletions
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8
plugins/outputs/influxdb/client/client.go
View File

@ -4,13 +4,7 @@ import "io"
type Client interface {
Query(command string) error
Write(b []byte) (int, error)
WriteWithParams(b []byte, params WriteParams) (int, error)
WriteStream(b io.Reader, contentLength int) (int, error)
WriteStreamWithParams(b io.Reader, contentLength int, params WriteParams) (int, error)
WriteStream(b io.Reader) error
Close() error
}

58
plugins/outputs/influxdb/client/http.go
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@ -137,60 +137,13 @@ func (c *httpClient) Query(command string) error {
return c.doRequest(req, http.StatusOK)
}
func (c *httpClient) Write(b []byte) (int, error) {
req, err := c.makeWriteRequest(bytes.NewReader(b), len(b), c.writeURL)
func (c *httpClient) WriteStream(r io.Reader) error {
req, err := c.makeWriteRequest(r, c.writeURL)
if err != nil {
return 0, nil
return err
}
err = c.doRequest(req, http.StatusNoContent)
if err == nil {
return len(b), nil
}
return 0, err
}
func (c *httpClient) WriteWithParams(b []byte, wp WriteParams) (int, error) {
req, err := c.makeWriteRequest(bytes.NewReader(b), len(b), writeURL(c.url, wp))
if err != nil {
return 0, nil
}
err = c.doRequest(req, http.StatusNoContent)
if err == nil {
return len(b), nil
}
return 0, err
}
func (c *httpClient) WriteStream(r io.Reader, contentLength int) (int, error) {
req, err := c.makeWriteRequest(r, contentLength, c.writeURL)
if err != nil {
return 0, nil
}
err = c.doRequest(req, http.StatusNoContent)
if err == nil {
return contentLength, nil
}
return 0, err
}
func (c *httpClient) WriteStreamWithParams(
r io.Reader,
contentLength int,
wp WriteParams,
) (int, error) {
req, err := c.makeWriteRequest(r, contentLength, writeURL(c.url, wp))
if err != nil {
return 0, nil
}
err = c.doRequest(req, http.StatusNoContent)
if err == nil {
return contentLength, nil
}
return 0, err
return c.doRequest(req, http.StatusNoContent)
}
func (c *httpClient) doRequest(
@ -232,7 +185,6 @@ func (c *httpClient) doRequest(
func (c *httpClient) makeWriteRequest(
body io.Reader,
contentLength int,
writeURL string,
) (*http.Request, error) {
req, err := c.makeRequest(writeURL, body)
@ -241,8 +193,6 @@ func (c *httpClient) makeWriteRequest(
}
if c.config.ContentEncoding == "gzip" {
req.Header.Set("Content-Encoding", "gzip")
} else {
req.Header.Set("Content-Length", fmt.Sprint(contentLength))
}
return req, nil
}

82
plugins/outputs/influxdb/client/http_test.go
View File

@ -110,66 +110,8 @@ func TestHTTPClient_Write(t *testing.T) {
client, err := NewHTTP(config, wp)
defer client.Close()
assert.NoError(t, err)
n, err := client.Write([]byte("cpu value=99\n"))
assert.Equal(t, 13, n)
assert.NoError(t, err)
_, err = client.WriteStream(bytes.NewReader([]byte("cpu value=99\n")), 13)
assert.NoError(t, err)
}
func TestHTTPClient_WriteParamsOverride(t *testing.T) {
ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
switch r.URL.Path {
case "/write":
// test that database is set properly
if r.FormValue("db") != "override" {
w.WriteHeader(http.StatusTeapot)
w.Header().Set("Content-Type", "application/json")
fmt.Fprintln(w, `{"results":[{}],"error":"wrong db name"}`)
}
// Validate the request body:
buf := make([]byte, 100)
n, _ := r.Body.Read(buf)
expected := "cpu value=99"
got := string(buf[0 : n-1])
if expected != got {
w.WriteHeader(http.StatusTeapot)
w.Header().Set("Content-Type", "application/json")
msg := fmt.Sprintf(`{"results":[{}],"error":"expected [%s], got [%s]"}`, expected, got)
fmt.Fprintln(w, msg)
}
w.WriteHeader(http.StatusNoContent)
w.Header().Set("Content-Type", "application/json")
case "/query":
w.WriteHeader(http.StatusOK)
w.Header().Set("Content-Type", "application/json")
fmt.Fprintln(w, `{"results":[{}]}`)
}
}))
defer ts.Close()
config := HTTPConfig{
URL: ts.URL,
}
defaultWP := WriteParams{
Database: "test",
}
client, err := NewHTTP(config, defaultWP)
defer client.Close()
assert.NoError(t, err)
// test that WriteWithParams overrides the default write params
wp := WriteParams{
Database: "override",
}
n, err := client.WriteWithParams([]byte("cpu value=99\n"), wp)
assert.Equal(t, 13, n)
assert.NoError(t, err)
_, err = client.WriteStreamWithParams(bytes.NewReader([]byte("cpu value=99\n")), 13, wp)
err = client.WriteStream(bytes.NewReader([]byte("cpu value=99\n")))
assert.NoError(t, err)
}
@ -197,23 +139,7 @@ func TestHTTPClient_Write_Errors(t *testing.T) {
assert.NoError(t, err)
lp := []byte("cpu value=99\n")
n, err := client.Write(lp)
assert.Equal(t, 0, n)
assert.Error(t, err)
n, err = client.WriteStream(bytes.NewReader(lp), 13)
assert.Equal(t, 0, n)
assert.Error(t, err)
wp := WriteParams{
Database: "override",
}
n, err = client.WriteWithParams(lp, wp)
assert.Equal(t, 0, n)
assert.Error(t, err)
n, err = client.WriteStreamWithParams(bytes.NewReader(lp), 13, wp)
assert.Equal(t, 0, n)
err = client.WriteStream(bytes.NewReader(lp))
assert.Error(t, err)
}
@ -404,8 +330,6 @@ func TestHTTPClient_PathPrefix(t *testing.T) {
assert.NoError(t, err)
err = client.Query("CREATE DATABASE test")
assert.NoError(t, err)
_, err = client.Write([]byte("cpu value=99\n"))
assert.NoError(t, err)
_, err = client.WriteStream(bytes.NewReader([]byte("cpu value=99\n")), 13)
err = client.WriteStream(bytes.NewReader([]byte("cpu value=99\n")))
assert.NoError(t, err)
}

27
plugins/outputs/influxdb/client/udp.go
View File

@ -1,7 +1,6 @@
package client
import (
"bytes"
"fmt"
"io"
"log"
@ -62,18 +61,8 @@ func (c *udpClient) Query(command string) error {
return nil
}
// Write will send the byte stream to the given UDP client endpoint
func (c *udpClient) Write(b []byte) (int, error) {
return c.WriteStream(bytes.NewReader(b), -1)
}
// WriteWithParams are ignored by the UDP client, will forward to WriteStream
func (c *udpClient) WriteWithParams(b []byte, wp WriteParams) (int, error) {
return c.WriteStream(bytes.NewReader(b), -1)
}
// WriteStream will send the provided data through to the client, contentLength is ignored by the UDP client
func (c *udpClient) WriteStream(r io.Reader, contentLength int) (int, error) {
func (c *udpClient) WriteStream(r io.Reader) error {
var totaln int
for {
nR, err := r.Read(c.buffer)
@ -81,14 +70,14 @@ func (c *udpClient) WriteStream(r io.Reader, contentLength int) (int, error) {
break
}
if err != io.EOF && err != nil {
return totaln, err
return err
}
if c.buffer[nR-1] == uint8('\n') {
nW, err := c.conn.Write(c.buffer[0:nR])
totaln += nW
if err != nil {
return totaln, err
return err
}
} else {
log.Printf("E! Could not fit point into UDP payload; dropping")
@ -99,7 +88,7 @@ func (c *udpClient) WriteStream(r io.Reader, contentLength int) (int, error) {
break
}
if err != io.EOF && err != nil {
return totaln, err
return err
}
if c.buffer[nR-1] == uint8('\n') {
break
@ -107,13 +96,7 @@ func (c *udpClient) WriteStream(r io.Reader, contentLength int) (int, error) {
}
}
}
return totaln, nil
}
// WriteStreamWithParams will forward the stream to the client backend, contentLength is ignored by the UDP client
// write params are ignored by the UDP client
func (c *udpClient) WriteStreamWithParams(r io.Reader, contentLength int, wp WriteParams) (int, error) {
return c.WriteStream(r, -1)
return nil
}
// Close will terminate the provided client connection

50
plugins/outputs/influxdb/client/udp_test.go
View File

@ -9,7 +9,6 @@ import (
"github.com/influxdata/telegraf/metric"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestUDPClient(t *testing.T) {
@ -65,43 +64,6 @@ func TestUDPClient_Write(t *testing.T) {
}
}()
// test sending simple metric
n, err := client.Write([]byte("cpu value=99\n"))
assert.Equal(t, n, 13)
assert.NoError(t, err)
pkt := <-packets
assert.Equal(t, "cpu value=99\n", pkt)
wp := WriteParams{}
//
// Using WriteStream() & a metric.Reader:
config3 := UDPConfig{
URL: "udp://localhost:8199",
PayloadSize: 40,
}
client3, err := NewUDP(config3)
assert.NoError(t, err)
now := time.Unix(1484142942, 0)
m1, _ := metric.New("test", map[string]string{},
map[string]interface{}{"value": 1.1}, now)
m2, _ := metric.New("test", map[string]string{},
map[string]interface{}{"value": 1.1}, now)
m3, _ := metric.New("test", map[string]string{},
map[string]interface{}{"value": 1.1}, now)
ms := []telegraf.Metric{m1, m2, m3}
mReader := metric.NewReader(ms)
n, err = client3.WriteStreamWithParams(mReader, 10, wp)
// 3 metrics at 35 bytes each (including the newline)
assert.Equal(t, 105, n)
assert.NoError(t, err)
pkt = <-packets
assert.Equal(t, "test value=1.1 1484142942000000000\n", pkt)
pkt = <-packets
assert.Equal(t, "test value=1.1 1484142942000000000\n", pkt)
pkt = <-packets
assert.Equal(t, "test value=1.1 1484142942000000000\n", pkt)
assert.NoError(t, client.Close())
config = UDPConfig{
@ -112,17 +74,15 @@ func TestUDPClient_Write(t *testing.T) {
assert.NoError(t, err)
ts := time.Unix(1484142943, 0)
m1, _ = metric.New("test", map[string]string{},
m1, _ := metric.New("test", map[string]string{},
map[string]interface{}{"this_is_a_very_long_field_name": 1.1}, ts)
m2, _ = metric.New("test", map[string]string{},
m2, _ := metric.New("test", map[string]string{},
map[string]interface{}{"value": 1.1}, ts)
ms = []telegraf.Metric{m1, m2}
ms := []telegraf.Metric{m1, m2}
reader := metric.NewReader(ms)
n, err = client4.WriteStream(reader, 0)
err = client4.WriteStream(reader)
assert.NoError(t, err)
require.Equal(t, 35, n)
assert.NoError(t, err)
pkt = <-packets
pkt := <-packets
assert.Equal(t, "test value=1.1 1484142943000000000\n", pkt)
assert.NoError(t, client4.Close())

8
plugins/outputs/influxdb/influxdb.go
View File

@ -183,12 +183,6 @@ func (i *InfluxDB) Description() string {
// Write will choose a random server in the cluster to write to until a successful write
// occurs, logging each unsuccessful. If all servers fail, return error.
func (i *InfluxDB) Write(metrics []telegraf.Metric) error {
bufsize := 0
for _, m := range metrics {
bufsize += m.Len()
}
r := metric.NewReader(metrics)
// This will get set to nil if a successful write occurs
@ -196,7 +190,7 @@ 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 {
if e := i.clients[n].WriteStream(r); e != nil {
// If the database was not found, try to recreate it:
if strings.Contains(e.Error(), "database not found") {
errc := i.clients[n].Query(fmt.Sprintf(`CREATE DATABASE "%s"`, qiReplacer.Replace(i.Database)))