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Merge pull request #38 from kenriortega/development
Development Otel
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -20,4 +20,5 @@ var ( | |
| flagPrevKey = "prevkey" | ||
| flagCfgFile = "cfgfile" | ||
| flagCfgPath = "cfgpath" | ||
| flagMetric = "metric" | ||
| ) | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,146 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "log" | ||
| "math/rand" | ||
| "net/http" | ||
| "time" | ||
|
|
||
| "github.com/gorilla/mux" | ||
| "github.com/kenriortega/ngonx/pkg/logger" | ||
| "github.com/kenriortega/ngonx/pkg/otelify" | ||
| "github.com/prometheus/client_golang/prometheus" | ||
| "github.com/prometheus/client_golang/prometheus/promhttp" | ||
| "go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp" | ||
| "go.opentelemetry.io/otel" | ||
| "go.opentelemetry.io/otel/trace" | ||
| "go.uber.org/zap" | ||
| ) | ||
|
|
||
| // global vars...gasp! | ||
| var addr = "127.0.0.1:8000" | ||
| var tracer trace.Tracer | ||
| var httpClient http.Client | ||
|
|
||
| func main() { | ||
| flush := otelify.InitProvider( | ||
| "example", | ||
| "v0.4.5", | ||
| "test", | ||
| "0.0.0.0:55680", | ||
| ) | ||
| defer flush() | ||
|
|
||
| // initiate globals | ||
| tracer = otel.Tracer("example-app") | ||
| httpClient = http.Client{Transport: otelhttp.NewTransport(http.DefaultTransport)} | ||
| // create and start server | ||
| server := instrumentedServer(handler) | ||
|
|
||
| fmt.Println("listening...") | ||
| log.Fatal(server.ListenAndServe()) | ||
| } | ||
|
|
||
| func handler(w http.ResponseWriter, r *http.Request) { | ||
| ctx := r.Context() | ||
|
|
||
| longRunningProcess(ctx) | ||
|
|
||
| // check cache | ||
| if shouldExecute(40) { | ||
| url := "http://" + addr + "/" | ||
|
|
||
| resp, err := instrumentedGet(ctx, url) | ||
| defer resp.Body.Close() | ||
| if err != nil { | ||
| http.Error(w, err.Error(), http.StatusInternalServerError) | ||
| } | ||
| } | ||
|
|
||
| // query database | ||
| if shouldExecute(40) { | ||
| url := "http://" + addr + "/" | ||
|
|
||
| resp, err := instrumentedGet(ctx, url) | ||
| defer resp.Body.Close() | ||
| if err != nil { | ||
| http.Error(w, err.Error(), http.StatusInternalServerError) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // #nosec | ||
| func shouldExecute(percent int) bool { | ||
| return rand.Int()%100 < percent | ||
| } | ||
|
|
||
| func longRunningProcess(ctx context.Context) { | ||
| ctx, sp := tracer.Start(ctx, "Long Running Process") | ||
| defer sp.End() | ||
|
|
||
| time.Sleep(time.Millisecond * 50) | ||
| sp.AddEvent("halfway done!") | ||
| time.Sleep(time.Millisecond * 50) | ||
| } | ||
|
|
||
| /*** | ||
| Server | ||
| ***/ | ||
| func instrumentedServer(handler http.HandlerFunc) *http.Server { | ||
| // OpenMetrics handler : metrics and exemplars | ||
| omHandleFunc := func(w http.ResponseWriter, r *http.Request) { | ||
| start := time.Now() | ||
|
|
||
| handler.ServeHTTP(w, r) | ||
|
|
||
| ctx := r.Context() | ||
| traceID := trace.SpanContextFromContext(ctx).TraceID().String() | ||
|
|
||
| otelify.MetricRequestLatencyProxy.(prometheus.ExemplarObserver).ObserveWithExemplar( | ||
| time.Since(start).Seconds(), prometheus.Labels{"traceID": traceID}, | ||
| ) | ||
|
|
||
| // log the trace id with other fields so we can discover traces through logs | ||
| logger.LogInfo( | ||
| "http request", | ||
| zap.String("traceID", traceID), | ||
| zap.String("path", r.URL.Path), | ||
| zap.Duration("latency", time.Since(start)), | ||
| ) | ||
| } | ||
|
|
||
| // OTel handler : traces | ||
| otelHandler := otelhttp.NewHandler(http.HandlerFunc(omHandleFunc), "http") | ||
|
|
||
| r := mux.NewRouter() | ||
| r.Handle("/", otelHandler) | ||
| r.Handle("/metrics", promhttp.HandlerFor(prometheus.DefaultGatherer, promhttp.HandlerOpts{ | ||
| EnableOpenMetrics: true, | ||
| })) | ||
|
|
||
| return &http.Server{ | ||
| Handler: r, | ||
| Addr: "0.0.0.0:8000", | ||
| } | ||
| } | ||
|
|
||
| /*** | ||
| Client | ||
| ***/ | ||
| func instrumentedGet(ctx context.Context, url string) (*http.Response, error) { | ||
| // create http request | ||
| req, err := http.NewRequestWithContext(ctx, "GET", url, nil) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
|
|
||
| return httpClient.Do(req) | ||
| } | ||
|
|
||
| func handleErr(err error, message string) { | ||
| if err != nil { | ||
| panic(fmt.Sprintf("%s: %s", err, message)) | ||
| } | ||
| } |
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