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server.go
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server.go
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package main
import (
"bytes"
"encoding/json"
"fmt"
"io"
"net/http"
"time"
"github.com/elastic/go-elasticsearch/v7/esutil"
"github.com/gorilla/mux"
"golang.org/x/exp/slog"
)
type Server struct {
batcher *Batcher
requestsReceived *Counter
malformedRequestsReceived *Counter
}
func NewServer(batcher *Batcher) (*Server, error) {
s := &Server{
batcher: batcher,
}
var err error
s.requestsReceived, err = NewDimensionlessCounter("http_request_count", "Number of http requests received, tagged by endpoint", endpointTag)
if err != nil {
return nil, fmt.Errorf("http_request_count counter: %w", err)
}
s.malformedRequestsReceived, err = NewDimensionlessCounter("http_request_malformed", "Number of malformed http requests received, tagged by endpoint", endpointTag)
if err != nil {
return nil, fmt.Errorf("http_request_malformed counter: %w", err)
}
return s, nil
}
func (s *Server) ConfigureRoutes(r *mux.Router) {
r.NotFoundHandler = http.HandlerFunc(s.NotFoundHandler)
r.Path("/traces/_doc").Methods("POST").HandlerFunc(s.TraceHandler)
r.Path("/traces/_bulk").Methods("POST").HandlerFunc(s.BulkTraceHandler)
r.PathPrefix("/").Methods("GET").HandlerFunc(s.RootHandler)
}
func (s *Server) NotFoundHandler(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusNotFound)
w.Write([]byte("Not Found"))
}
func (s *Server) TraceHandler(w http.ResponseWriter, r *http.Request) {
w.Header().Set("X-Elastic-Product", "Elasticsearch")
mctx := endpointContext(r.Context(), "_doc")
s.requestsReceived.Add(mctx, 1)
buf := new(bytes.Buffer)
if _, err := buf.ReadFrom(r.Body); err != nil {
slog.Error("read body", err)
s.malformedRequestsReceived.Add(mctx, 1)
w.WriteHeader(http.StatusBadRequest)
return
}
event := new(TraceEvent)
if err := json.Unmarshal(buf.Bytes(), &event); err != nil {
slog.Error("unmarshal body", err)
s.malformedRequestsReceived.Add(mctx, 1)
w.WriteHeader(http.StatusBadRequest)
return
}
s.batcher.Add(r.Context(), event)
w.WriteHeader(http.StatusOK)
}
func (s *Server) BulkTraceHandler(w http.ResponseWriter, r *http.Request) {
w.Header().Set("X-Elastic-Product", "Elasticsearch")
// return vars
mctx := endpointContext(r.Context(), "_bulk")
s.requestsReceived.Add(mctx, 1)
iniT := time.Now()
var total, successful, empty, failed int
var bulkResp esutil.BulkIndexerResponse
reqBuf := new(bytes.Buffer)
defer r.Body.Close()
if _, err := reqBuf.ReadFrom(r.Body); err != nil {
slog.Error("read body", err)
s.malformedRequestsReceived.Add(mctx, 1)
w.WriteHeader(http.StatusBadRequest)
return
} else {
reqDec := json.NewDecoder(bytes.NewReader(reqBuf.Bytes()))
for reqDec.More() {
var tracEv TraceEvent
decErr := reqDec.Decode(&tracEv)
if decErr == io.EOF {
break
} else if decErr != nil {
total++
failed++
slog.Error("decoding ES trace:", decErr)
s.malformedRequestsReceived.Add(mctx, 1)
continue
} else {
total++
if tracEv.Type != nil {
s.batcher.Add(r.Context(), &tracEv)
successful++
} else {
empty++
}
continue
}
}
slog.Debug("received bulk request",
"total", total,
"successful", successful,
"empty", empty,
"failed", failed,
)
// compose reply
finT := time.Since(iniT)
bulkResp.Took = int(finT.Seconds())
jres, err := json.Marshal(bulkResp)
if err != nil {
slog.Error("unable to compose bulk response", err)
s.malformedRequestsReceived.Add(mctx, 1)
w.WriteHeader(http.StatusBadRequest)
}
w.Write(jres)
}
}
func (s *Server) RootHandler(w http.ResponseWriter, r *http.Request) {
slog.Info("connection from client", "remote_addr", r.RemoteAddr)
w.Header().Set("X-Elastic-Product", "Elasticsearch")
w.WriteHeader(http.StatusOK)
w.Write([]byte(`{
"cluster_name": "traces",
"cluster_uuid": "aaaabbbbccccddddaaaabbbbccccdddd",
"name": "traces",
"tagline": "You Know, for Search",
"version": {
"build_date": "2023-01-01",
"build_flavor": "default",
"build_hash": "",
"build_snapshot": false,
"build_type": "",
"lucene_version": "",
"minimum_index_compatibility_version": "5.6.0",
"minimum_wire_compatibility_version": "5.6.0",
"number": "7.0.0"
}
}`))
}