zlog/hlog/hlog_example_test.go

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package hlog_test
import (
"net/http"
"os"
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"time"
"net/http/httptest"
"github.com/rs/zerolog"
"github.com/rs/zerolog/hlog"
)
// fake alice to avoid dep
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type middleware func(http.Handler) http.Handler
type alice struct {
m []middleware
}
func (a alice) Append(m middleware) alice {
a.m = append(a.m, m)
return a
}
func (a alice) Then(h http.Handler) http.Handler {
for i := range a.m {
h = a.m[len(a.m)-1-i](h)
}
return h
}
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func init() {
zerolog.TimestampFunc = func() time.Time {
return time.Date(2001, time.February, 3, 4, 5, 6, 7, time.UTC)
}
}
func Example_handler() {
log := zerolog.New(os.Stdout).With().
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Timestamp().
Str("role", "my-service").
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Str("host", "local-hostname").
Logger()
c := alice{}
// Install the logger handler with default output on the console
c = c.Append(hlog.NewHandler(log))
// Install some provided extra handler to set some request's context fields.
// Thanks to those handler, all our logs will come with some pre-populated fields.
c = c.Append(hlog.RemoteAddrHandler("ip"))
c = c.Append(hlog.UserAgentHandler("user_agent"))
c = c.Append(hlog.RefererHandler("referer"))
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//c = c.Append(hlog.RequestIDHandler("req_id", "Request-Id"))
// Here is your final handler
h := c.Then(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// Get the logger from the request's context. You can safely assume it
// will be always there: if the handler is removed, hlog.FromRequest
// will return a no-op logger.
hlog.FromRequest(r).Info().
Str("user", "current user").
Str("status", "ok").
Msg("Something happend")
}))
http.Handle("/", h)
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h.ServeHTTP(httptest.NewRecorder(), &http.Request{})
// Output: {"level":"info","time":"2001-02-03T04:05:06Z","role":"my-service","host":"local-hostname","user":"current user","status":"ok","message":"Something happend"}
}