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server.go
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server.go
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// Copyright © 2022 Circonus, Inc. <support@circonus.com>
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//
package server
import (
"context"
"errors"
"net/http"
"time"
"github.com/circonus-labs/go-trapmetrics"
"github.com/circonus/c3-exporter/internal/config"
"github.com/circonus/c3-exporter/internal/logger"
"github.com/rs/zerolog/log"
)
type Server struct {
srv *http.Server
cfg *config.Config
idleConnsClosed chan struct{}
metrics *trapmetrics.TrapMetrics
tls bool
}
func New(cfg *config.Config) (*Server, error) {
readTimeout, err := time.ParseDuration(cfg.Server.ReadTimeout)
if err != nil {
return nil, err
}
writeTimeout, err := time.ParseDuration(cfg.Server.WriteTimeout)
if err != nil {
return nil, err
}
idleTimeout, err := time.ParseDuration(cfg.Server.IdleTimeout)
if err != nil {
return nil, err
}
readHeaderTimeout, err := time.ParseDuration(cfg.Server.ReadHeaderTimeout)
if err != nil {
return nil, err
}
handlerTimeout, err := time.ParseDuration(cfg.Server.HandlerTimeout)
if err != nil {
return nil, err
}
s := &Server{
cfg: cfg,
tls: cfg.Server.CertFile != "" && cfg.Server.KeyFile != "",
idleConnsClosed: make(chan struct{}),
}
// create the check for tracking
metrics, err := initMetrics(cfg.Circonus)
if err != nil {
return nil, err
}
s.metrics = metrics
mux := http.NewServeMux()
mux.Handle("/", s.verifyBasicAuth(genericHandler{s: s}))
mux.Handle("/health", healthHandler{})
mux.Handle("/_bulk", s.verifyBasicAuth(http.TimeoutHandler(bulkHandler{
dest: cfg.Destination,
log: logger.LogWrapper{
Log: log.With().Str("handler", "/_bulk").Logger(),
Debug: cfg.Debug,
},
dataToken: cfg.Circonus.APIKey,
metrics: metrics,
}, handlerTimeout, "Handler timeout")))
mux.Handle("/_cluster/settings", s.verifyBasicAuth(clusterSettingsHandler{s: s}))
mux.Handle("/otel-v1-apm-service-map", s.verifyBasicAuth(otelv1apmservicemapHandler{s: s}))
mux.Handle("/_template/", s.verifyBasicAuth(templateHandler{s: s}))
mux.Handle("/_opendistro/_ism/policies/raw-span-policy", s.verifyBasicAuth(ismPolicyHandler{s: s}))
mux.Handle("/otel-v1-apm-span-000001", s.verifyBasicAuth(otelSpanHandler{s: s}))
mux.Handle("/otel-v1-apm-span/_search", s.verifyBasicAuth(otelSpanSearchHandler{s: s}))
mux.Handle("/otel-v1-apm-span/_bulk", s.verifyBasicAuth(http.TimeoutHandler(bulkHandler{
dest: cfg.Destination,
log: logger.LogWrapper{
Log: log.With().Str("handler", "/_bulk").Logger(),
Debug: cfg.Debug,
},
dataToken: cfg.Circonus.APIKey,
metrics: metrics,
}, handlerTimeout, "Handler timeout")))
s.srv = &http.Server{
Addr: cfg.Server.Address,
ReadTimeout: readTimeout,
WriteTimeout: writeTimeout,
IdleTimeout: idleTimeout,
ReadHeaderTimeout: readHeaderTimeout,
Handler: mux,
}
return s, nil
}
func (s *Server) Start(ctx context.Context) error {
if done(ctx) {
return ctx.Err()
}
go func(ctx context.Context) {
ticker := time.NewTicker(s.cfg.Circonus.FlushInterval)
for {
select {
case <-ctx.Done():
return
case <-ticker.C:
r, err := s.metrics.Flush(ctx)
if err != nil {
log.Warn().Err(err).Msg("flushing circonus metrics")
}
log.Debug().
Str("check_uuid", r.CheckUUID).
Str("submit_uuid", r.SubmitUUID).
Str("error", r.Error).
Uint64("filtered", r.Filtered).
Uint64("stats", r.Stats).
Int("bytes", r.BytesSent).
Str("encode_dur", r.EncodeDuration.String()).
Str("submit_dur", r.SubmitDuration.String()).
Str("last_req_dur", r.LastReqDuration.String()).
Str("flush_dur", r.FlushDuration.String()).
Msg("flushed metrics")
}
}
}(ctx)
if s.cfg.Server.CertFile != "" && s.cfg.Server.KeyFile != "" {
log.Info().Str("listen", s.srv.Addr).Msg("starting TLS server")
if err := s.srv.ListenAndServeTLS(s.cfg.Server.CertFile, s.cfg.Server.KeyFile); err != nil {
if !errors.Is(err, http.ErrServerClosed) {
log.Error().Err(err).Msg("listen and serve tls")
}
}
} else {
log.Info().Str("listen", s.srv.Addr).Msg("starting server")
if err := s.srv.ListenAndServe(); err != nil {
if !errors.Is(err, http.ErrServerClosed) {
log.Error().Err(err).Msg("listen and serve")
}
}
}
<-s.idleConnsClosed
return nil
}
func (s *Server) Stop(ctx context.Context) error {
log.Info().Msg("shutting down server")
toctx, cancel := context.WithTimeout(ctx, 30*time.Second)
defer cancel()
if err := s.srv.Shutdown(toctx); err != nil {
log.Error().Err(err).Msg("server shutdown")
}
close(s.idleConnsClosed)
// if no error, check the ctx and return that error
if done(ctx) {
return ctx.Err()
}
return nil
}
func done(ctx context.Context) bool {
select {
case <-ctx.Done():
return true
default:
return false
}
}