166 lines
3.7 KiB
Go
166 lines
3.7 KiB
Go
package http_listener
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import (
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"bufio"
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"bytes"
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"fmt"
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"log"
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"net"
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"net/http"
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"sync"
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"time"
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"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/internal"
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"github.com/influxdata/telegraf/plugins/inputs"
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"github.com/influxdata/telegraf/plugins/inputs/http_listener/stoppableListener"
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"github.com/influxdata/telegraf/plugins/parsers"
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)
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type HttpListener struct {
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ServiceAddress string
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ReadTimeout internal.Duration
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WriteTimeout internal.Duration
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sync.Mutex
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wg sync.WaitGroup
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listener *stoppableListener.StoppableListener
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parser parsers.Parser
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acc telegraf.Accumulator
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}
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const sampleConfig = `
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## Address and port to host HTTP listener on
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service_address = ":8186"
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## timeouts
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read_timeout = "10s"
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write_timeout = "10s"
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`
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func (t *HttpListener) SampleConfig() string {
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return sampleConfig
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}
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func (t *HttpListener) Description() string {
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return "Influx HTTP write listener"
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}
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func (t *HttpListener) Gather(_ telegraf.Accumulator) error {
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return nil
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}
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func (t *HttpListener) SetParser(parser parsers.Parser) {
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t.parser = parser
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}
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// Start starts the http listener service.
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func (t *HttpListener) Start(acc telegraf.Accumulator) error {
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t.Lock()
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defer t.Unlock()
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t.acc = acc
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var rawListener, err = net.Listen("tcp", t.ServiceAddress)
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if err != nil {
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return err
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}
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t.listener, err = stoppableListener.New(rawListener)
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if err != nil {
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return err
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}
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go t.httpListen()
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log.Printf("I! Started HTTP listener service on %s\n", t.ServiceAddress)
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return nil
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}
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// Stop cleans up all resources
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func (t *HttpListener) Stop() {
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t.Lock()
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defer t.Unlock()
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t.listener.Stop()
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t.listener.Close()
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t.wg.Wait()
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log.Println("I! Stopped HTTP listener service on ", t.ServiceAddress)
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}
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// httpListen listens for HTTP requests.
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func (t *HttpListener) httpListen() error {
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if t.ReadTimeout.Duration < time.Second {
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t.ReadTimeout.Duration = time.Second * 10
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}
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if t.WriteTimeout.Duration < time.Second {
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t.WriteTimeout.Duration = time.Second * 10
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}
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var server = http.Server{
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Handler: t,
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ReadTimeout: t.ReadTimeout.Duration,
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WriteTimeout: t.WriteTimeout.Duration,
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}
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return server.Serve(t.listener)
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}
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func (t *HttpListener) ServeHTTP(res http.ResponseWriter, req *http.Request) {
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t.wg.Add(1)
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defer t.wg.Done()
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switch req.URL.Path {
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case "/write":
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var http400msg bytes.Buffer
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var partial string
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scanner := bufio.NewScanner(req.Body)
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scanner.Buffer([]byte(""), 128*1024)
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for scanner.Scan() {
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metrics, err := t.parser.Parse(scanner.Bytes())
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if err == nil {
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for _, m := range metrics {
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t.acc.AddFields(m.Name(), m.Fields(), m.Tags(), m.Time())
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}
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partial = "partial write: "
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} else {
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http400msg.WriteString(err.Error() + " ")
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}
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}
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if err := scanner.Err(); err != nil {
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http.Error(res, "Internal server error: "+err.Error(), http.StatusInternalServerError)
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} else if http400msg.Len() > 0 {
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res.Header().Set("Content-Type", "application/json")
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res.Header().Set("X-Influxdb-Version", "1.0")
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res.WriteHeader(http.StatusBadRequest)
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res.Write([]byte(fmt.Sprintf(`{"error":"%s%s"}`, partial, http400msg.String())))
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} else {
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res.WriteHeader(http.StatusNoContent)
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}
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case "/query":
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// Deliver a dummy response to the query endpoint, as some InfluxDB
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// clients test endpoint availability with a query
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res.Header().Set("Content-Type", "application/json")
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res.Header().Set("X-Influxdb-Version", "1.0")
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res.WriteHeader(http.StatusOK)
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res.Write([]byte("{\"results\":[]}"))
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case "/ping":
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// respond to ping requests
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res.WriteHeader(http.StatusNoContent)
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default:
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// Don't know how to respond to calls to other endpoints
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http.NotFound(res, req)
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}
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}
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func init() {
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inputs.Add("http_listener", func() telegraf.Input {
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return &HttpListener{}
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})
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}
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