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http_listener_v2.go
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http_listener_v2.go
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package http_listener_v2
import (
"compress/gzip"
"crypto/subtle"
"crypto/tls"
"io/ioutil"
"net"
"net/http"
"net/url"
"strings"
"sync"
"time"
"github.com/golang/snappy"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/config"
tlsint "github.com/influxdata/telegraf/plugins/common/tls"
"github.com/influxdata/telegraf/plugins/inputs"
"github.com/influxdata/telegraf/plugins/parsers"
)
// defaultMaxBodySize is the default maximum request body size, in bytes.
// if the request body is over this size, we will return an HTTP 413 error.
// 500 MB
const defaultMaxBodySize = 500 * 1024 * 1024
const (
body = "body"
query = "query"
)
// TimeFunc provides a timestamp for the metrics
type TimeFunc func() time.Time
// HTTPListenerV2 is an input plugin that collects external metrics sent via HTTP
type HTTPListenerV2 struct {
ServiceAddress string `toml:"service_address"`
Path string `toml:"path"`
Methods []string `toml:"methods"`
DataSource string `toml:"data_source"`
ReadTimeout config.Duration `toml:"read_timeout"`
WriteTimeout config.Duration `toml:"write_timeout"`
MaxBodySize config.Size `toml:"max_body_size"`
Port int `toml:"port"`
BasicUsername string `toml:"basic_username"`
BasicPassword string `toml:"basic_password"`
HTTPHeaderTags map[string]string `toml:"http_header_tags"`
tlsint.ServerConfig
TimeFunc
Log telegraf.Logger
wg sync.WaitGroup
listener net.Listener
parsers.Parser
acc telegraf.Accumulator
}
const sampleConfig = `
## Address and port to host HTTP listener on
service_address = ":8080"
## Path to listen to.
# path = "/telegraf"
## HTTP methods to accept.
# methods = ["POST", "PUT"]
## maximum duration before timing out read of the request
# read_timeout = "10s"
## maximum duration before timing out write of the response
# write_timeout = "10s"
## Maximum allowed http request body size in bytes.
## 0 means to use the default of 524,288,00 bytes (500 mebibytes)
# max_body_size = "500MB"
## Part of the request to consume. Available options are "body" and
## "query".
# data_source = "body"
## Set one or more allowed client CA certificate file names to
## enable mutually authenticated TLS connections
# tls_allowed_cacerts = ["/etc/telegraf/clientca.pem"]
## Add service certificate and key
# tls_cert = "/etc/telegraf/cert.pem"
# tls_key = "/etc/telegraf/key.pem"
## Optional username and password to accept for HTTP basic authentication.
## You probably want to make sure you have TLS configured above for this.
# basic_username = "foobar"
# basic_password = "barfoo"
## Optional setting to map http headers into tags
## If the http header is not present on the request, no corresponding tag will be added
## If multiple instances of the http header are present, only the first value will be used
# http_header_tags = {"HTTP_HEADER" = "TAG_NAME"}
## Data format to consume.
## Each data format has its own unique set of configuration options, read
## more about them here:
## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md
data_format = "influx"
`
func (h *HTTPListenerV2) SampleConfig() string {
return sampleConfig
}
func (h *HTTPListenerV2) Description() string {
return "Generic HTTP write listener"
}
func (h *HTTPListenerV2) Gather(_ telegraf.Accumulator) error {
return nil
}
func (h *HTTPListenerV2) SetParser(parser parsers.Parser) {
h.Parser = parser
}
// Start starts the http listener service.
func (h *HTTPListenerV2) Start(acc telegraf.Accumulator) error {
if h.MaxBodySize == 0 {
h.MaxBodySize = config.Size(defaultMaxBodySize)
}
if h.ReadTimeout < config.Duration(time.Second) {
h.ReadTimeout = config.Duration(time.Second * 10)
}
if h.WriteTimeout < config.Duration(time.Second) {
h.WriteTimeout = config.Duration(time.Second * 10)
}
h.acc = acc
tlsConf, err := h.ServerConfig.TLSConfig()
if err != nil {
return err
}
server := &http.Server{
Addr: h.ServiceAddress,
Handler: h,
ReadTimeout: time.Duration(h.ReadTimeout),
WriteTimeout: time.Duration(h.WriteTimeout),
TLSConfig: tlsConf,
}
var listener net.Listener
if tlsConf != nil {
listener, err = tls.Listen("tcp", h.ServiceAddress, tlsConf)
} else {
listener, err = net.Listen("tcp", h.ServiceAddress)
}
if err != nil {
return err
}
h.listener = listener
h.Port = listener.Addr().(*net.TCPAddr).Port
h.wg.Add(1)
go func() {
defer h.wg.Done()
if err := server.Serve(h.listener); err != nil {
h.Log.Errorf("Serve failed: %v", err)
}
}()
h.Log.Infof("Listening on %s", listener.Addr().String())
return nil
}
// Stop cleans up all resources
func (h *HTTPListenerV2) Stop() {
if h.listener != nil {
// Ignore the returned error as we cannot do anything about it anyway
//nolint:errcheck,revive
h.listener.Close()
}
h.wg.Wait()
}
func (h *HTTPListenerV2) ServeHTTP(res http.ResponseWriter, req *http.Request) {
handler := h.serveWrite
if req.URL.Path != h.Path {
handler = http.NotFound
}
h.authenticateIfSet(handler, res, req)
}
func (h *HTTPListenerV2) serveWrite(res http.ResponseWriter, req *http.Request) {
// Check that the content length is not too large for us to handle.
if req.ContentLength > int64(h.MaxBodySize) {
if err := tooLarge(res); err != nil {
h.Log.Debugf("error in too-large: %v", err)
}
return
}
// Check if the requested HTTP method was specified in config.
isAcceptedMethod := false
for _, method := range h.Methods {
if req.Method == method {
isAcceptedMethod = true
break
}
}
if !isAcceptedMethod {
if err := methodNotAllowed(res); err != nil {
h.Log.Debugf("error in method-not-allowed: %v", err)
}
return
}
var bytes []byte
var ok bool
switch strings.ToLower(h.DataSource) {
case query:
bytes, ok = h.collectQuery(res, req)
default:
bytes, ok = h.collectBody(res, req)
}
if !ok {
return
}
metrics, err := h.Parse(bytes)
if err != nil {
h.Log.Debugf("Parse error: %s", err.Error())
if err := badRequest(res); err != nil {
h.Log.Debugf("error in bad-request: %v", err)
}
return
}
for _, m := range metrics {
for headerName, measurementName := range h.HTTPHeaderTags {
headerValues := req.Header.Get(headerName)
if len(headerValues) > 0 {
m.AddTag(measurementName, headerValues)
}
}
h.acc.AddMetric(m)
}
res.WriteHeader(http.StatusNoContent)
}
func (h *HTTPListenerV2) collectBody(res http.ResponseWriter, req *http.Request) ([]byte, bool) {
encoding := req.Header.Get("Content-Encoding")
switch encoding {
case "gzip":
r, err := gzip.NewReader(req.Body)
if err != nil {
h.Log.Debug(err.Error())
if err := badRequest(res); err != nil {
h.Log.Debugf("error in bad-request: %v", err)
}
return nil, false
}
defer r.Close()
maxReader := http.MaxBytesReader(res, r, int64(h.MaxBodySize))
bytes, err := ioutil.ReadAll(maxReader)
if err != nil {
if err := tooLarge(res); err != nil {
h.Log.Debugf("error in too-large: %v", err)
}
return nil, false
}
return bytes, true
case "snappy":
defer req.Body.Close()
bytes, err := ioutil.ReadAll(req.Body)
if err != nil {
h.Log.Debug(err.Error())
if err := badRequest(res); err != nil {
h.Log.Debugf("error in bad-request: %v", err)
}
return nil, false
}
// snappy block format is only supported by decode/encode not snappy reader/writer
bytes, err = snappy.Decode(nil, bytes)
if err != nil {
h.Log.Debug(err.Error())
if err := badRequest(res); err != nil {
h.Log.Debugf("error in bad-request: %v", err)
}
return nil, false
}
return bytes, true
default:
defer req.Body.Close()
bytes, err := ioutil.ReadAll(req.Body)
if err != nil {
h.Log.Debug(err.Error())
if err := badRequest(res); err != nil {
h.Log.Debugf("error in bad-request: %v", err)
}
return nil, false
}
return bytes, true
}
}
func (h *HTTPListenerV2) collectQuery(res http.ResponseWriter, req *http.Request) ([]byte, bool) {
rawQuery := req.URL.RawQuery
query, err := url.QueryUnescape(rawQuery)
if err != nil {
h.Log.Debugf("Error parsing query: %s", err.Error())
if err := badRequest(res); err != nil {
h.Log.Debugf("error in bad-request: %v", err)
}
return nil, false
}
return []byte(query), true
}
func tooLarge(res http.ResponseWriter) error {
res.Header().Set("Content-Type", "application/json")
res.WriteHeader(http.StatusRequestEntityTooLarge)
_, err := res.Write([]byte(`{"error":"http: request body too large"}`))
return err
}
func methodNotAllowed(res http.ResponseWriter) error {
res.Header().Set("Content-Type", "application/json")
res.WriteHeader(http.StatusMethodNotAllowed)
_, err := res.Write([]byte(`{"error":"http: method not allowed"}`))
return err
}
func badRequest(res http.ResponseWriter) error {
res.Header().Set("Content-Type", "application/json")
res.WriteHeader(http.StatusBadRequest)
_, err := res.Write([]byte(`{"error":"http: bad request"}`))
return err
}
func (h *HTTPListenerV2) authenticateIfSet(handler http.HandlerFunc, res http.ResponseWriter, req *http.Request) {
if h.BasicUsername != "" && h.BasicPassword != "" {
reqUsername, reqPassword, ok := req.BasicAuth()
if !ok ||
subtle.ConstantTimeCompare([]byte(reqUsername), []byte(h.BasicUsername)) != 1 ||
subtle.ConstantTimeCompare([]byte(reqPassword), []byte(h.BasicPassword)) != 1 {
http.Error(res, "Unauthorized.", http.StatusUnauthorized)
return
}
handler(res, req)
} else {
handler(res, req)
}
}
func init() {
inputs.Add("http_listener_v2", func() telegraf.Input {
return &HTTPListenerV2{
ServiceAddress: ":8080",
TimeFunc: time.Now,
Path: "/telegraf",
Methods: []string{"POST", "PUT"},
DataSource: body,
}
})
}