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PoContext.go
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| package main | |
| import ( | |
| "context" | |
| "github.com/go-chi/chi" | |
| "github.com/satori/go.uuid" | |
| "github.com/sirupsen/logrus" | |
| "net/http" | |
| "time" | |
| ) | |
| type indexContext int | |
| const ( | |
| traceIDKey = iota | |
| ) | |
| var ( | |
| fieldLogger logrus.FieldLogger | |
| ) | |
| func init() { | |
| l := logrus.New() | |
| l.Formatter = &logrus.JSONFormatter{FieldMap: logrus.FieldMap{ | |
| logrus.FieldKeyTime: "@timestamp", | |
| logrus.FieldKeyMsg: "message", | |
| }} | |
| fieldLogger = l.WithField("key", "val") | |
| } | |
| func WithTraceID(ctx context.Context, traceID string) context.Context { | |
| return context.WithValue(ctx, traceIDKey, traceID) | |
| } | |
| func Logger(ctx context.Context) logrus.FieldLogger { | |
| logger := fieldLogger | |
| if traceID, ok := ctx.Value(traceIDKey).(string); ok { | |
| logger = logger.WithField("traceID", traceID) | |
| } | |
| return logger | |
| } | |
| type GetHandler struct { | |
| ctx context.Context | |
| } | |
| func NewGetHandler(ctx context.Context) *GetHandler { | |
| return &GetHandler{ | |
| ctx: ctx, | |
| } | |
| } | |
| func (h *GetHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { | |
| ctx := WithTraceID(h.ctx, uuid.NewV4().String()) | |
| someOtherFunc(ctx) | |
| } | |
| func someOtherFunc(ctx context.Context) { | |
| log := Logger(ctx) | |
| log.Info("Starting func") | |
| time.Sleep(time.Second * 5) | |
| log.Info("Finishing func") | |
| } | |
| func main() { | |
| ctx := context.Background() | |
| router := chi.NewRouter() | |
| router.Get("/", NewGetHandler(ctx).ServeHTTP) | |
| http.ListenAndServe(":8888", router) | |
| } |
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