telegraf/plugins/outputs/influxdb_v2/http.go

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package influxdb_v2
import (
"context"
"crypto/tls"
"encoding/json"
"errors"
"fmt"
"io"
"log"
"net"
"net/http"
"net/url"
"path"
"strconv"
"time"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/internal"
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"github.com/influxdata/telegraf/plugins/serializers/influx"
)
type APIError struct {
StatusCode int
Title string
Description string
}
func (e APIError) Error() string {
if e.Description != "" {
return fmt.Sprintf("%s: %s", e.Title, e.Description)
}
return e.Title
}
const (
defaultRequestTimeout = time.Second * 5
defaultMaxWait = 10 // seconds
defaultDatabase = "telegraf"
)
type HTTPConfig struct {
URL *url.URL
Token string
Organization string
Bucket string
BucketTag string
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Timeout time.Duration
Headers map[string]string
Proxy *url.URL
UserAgent string
ContentEncoding string
TLSConfig *tls.Config
Serializer *influx.Serializer
}
type httpClient struct {
ContentEncoding string
Timeout time.Duration
Headers map[string]string
Organization string
Bucket string
BucketTag string
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client *http.Client
serializer *influx.Serializer
url *url.URL
retryTime time.Time
}
func NewHTTPClient(config *HTTPConfig) (*httpClient, error) {
if config.URL == nil {
return nil, ErrMissingURL
}
timeout := config.Timeout
if timeout == 0 {
timeout = defaultRequestTimeout
}
userAgent := config.UserAgent
if userAgent == "" {
userAgent = "Telegraf/" + internal.Version()
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}
var headers = make(map[string]string, len(config.Headers)+2)
headers["User-Agent"] = userAgent
headers["Authorization"] = "Token " + config.Token
for k, v := range config.Headers {
headers[k] = v
}
var proxy func(*http.Request) (*url.URL, error)
if config.Proxy != nil {
proxy = http.ProxyURL(config.Proxy)
} else {
proxy = http.ProxyFromEnvironment
}
serializer := config.Serializer
if serializer == nil {
serializer = influx.NewSerializer()
}
var transport *http.Transport
switch config.URL.Scheme {
case "http", "https":
transport = &http.Transport{
Proxy: proxy,
TLSClientConfig: config.TLSConfig,
}
case "unix":
transport = &http.Transport{
Dial: func(_, _ string) (net.Conn, error) {
return net.DialTimeout(
config.URL.Scheme,
config.URL.Path,
timeout,
)
},
}
default:
return nil, fmt.Errorf("unsupported scheme %q", config.URL.Scheme)
}
client := &httpClient{
serializer: serializer,
client: &http.Client{
Timeout: timeout,
Transport: transport,
},
url: config.URL,
ContentEncoding: config.ContentEncoding,
Timeout: timeout,
Headers: headers,
Organization: config.Organization,
Bucket: config.Bucket,
BucketTag: config.BucketTag,
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}
return client, nil
}
// URL returns the origin URL that this client connects too.
func (c *httpClient) URL() string {
return c.url.String()
}
type genericRespError struct {
Code string
Message string
Line *int32
MaxLength *int32
}
func (g genericRespError) Error() string {
errString := fmt.Sprintf("%s: %s", g.Code, g.Message)
if g.Line != nil {
return fmt.Sprintf("%s - line[%d]", errString, g.Line)
} else if g.MaxLength != nil {
return fmt.Sprintf("%s - maxlen[%d]", errString, g.MaxLength)
}
return errString
}
func (c *httpClient) Write(ctx context.Context, metrics []telegraf.Metric) error {
if c.retryTime.After(time.Now()) {
return errors.New("Retry time has not elapsed")
}
batches := make(map[string][]telegraf.Metric)
if c.BucketTag == "" {
err := c.writeBatch(ctx, c.Bucket, metrics)
if err != nil {
return err
}
} else {
for _, metric := range metrics {
bucket, ok := metric.GetTag(c.BucketTag)
if !ok {
bucket = c.Bucket
}
if _, ok := batches[bucket]; !ok {
batches[bucket] = make([]telegraf.Metric, 0)
}
batches[bucket] = append(batches[bucket], metric)
}
for bucket, batch := range batches {
err := c.writeBatch(ctx, bucket, batch)
if err != nil {
return err
}
}
}
return nil
}
func (c *httpClient) writeBatch(ctx context.Context, bucket string, metrics []telegraf.Metric) error {
url, err := makeWriteURL(*c.url, c.Organization, bucket)
if err != nil {
return err
}
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reader := influx.NewReader(metrics, c.serializer)
req, err := c.makeWriteRequest(url, reader)
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if err != nil {
return err
}
resp, err := c.client.Do(req.WithContext(ctx))
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode == http.StatusNoContent {
return nil
}
writeResp := &genericRespError{}
err = json.NewDecoder(resp.Body).Decode(writeResp)
desc := writeResp.Error()
if err != nil {
desc = resp.Status
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}
switch resp.StatusCode {
case http.StatusBadRequest, http.StatusRequestEntityTooLarge:
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log.Printf("E! [outputs.influxdb_v2] Failed to write metric: %s\n", desc)
return nil
case http.StatusUnauthorized, http.StatusForbidden:
return fmt.Errorf("failed to write metric: %s", desc)
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case http.StatusTooManyRequests, http.StatusServiceUnavailable:
retryAfter := resp.Header.Get("Retry-After")
retry, err := strconv.Atoi(retryAfter)
if err != nil {
retry = 0
}
if retry > defaultMaxWait {
retry = defaultMaxWait
}
c.retryTime = time.Now().Add(time.Duration(retry) * time.Second)
return fmt.Errorf("Waiting %ds for server before sending metric again", retry)
}
// This is only until platform spec is fully implemented. As of the
// time of writing, there is no error body returned.
if xErr := resp.Header.Get("X-Influx-Error"); xErr != "" {
desc = fmt.Sprintf("%s; %s", desc, xErr)
}
return &APIError{
StatusCode: resp.StatusCode,
Title: resp.Status,
Description: desc,
}
}
func (c *httpClient) makeWriteRequest(url string, body io.Reader) (*http.Request, error) {
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var err error
if c.ContentEncoding == "gzip" {
body, err = internal.CompressWithGzip(body)
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if err != nil {
return nil, err
}
}
req, err := http.NewRequest("POST", url, body)
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if err != nil {
return nil, err
}
req.Header.Set("Content-Type", "text/plain; charset=utf-8")
c.addHeaders(req)
if c.ContentEncoding == "gzip" {
req.Header.Set("Content-Encoding", "gzip")
}
return req, nil
}
func (c *httpClient) addHeaders(req *http.Request) {
for header, value := range c.Headers {
req.Header.Set(header, value)
}
}
func makeWriteURL(loc url.URL, org, bucket string) (string, error) {
params := url.Values{}
params.Set("bucket", bucket)
params.Set("org", org)
switch loc.Scheme {
case "unix":
loc.Scheme = "http"
loc.Host = "127.0.0.1"
loc.Path = "/api/v2/write"
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case "http", "https":
loc.Path = path.Join(loc.Path, "/api/v2/write")
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default:
return "", fmt.Errorf("unsupported scheme: %q", loc.Scheme)
}
loc.RawQuery = params.Encode()
return loc.String(), nil
}