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middleware.go
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middleware.go
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/*
* Copyright 2022 Django Cass
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package logging
import (
"github.com/go-logr/logr"
"gitlab.com/av1o/cap10/pkg/client"
"go.opentelemetry.io/otel"
"net/http"
)
const (
KeyTraceID = "trace_id"
KeySpanID = "span_id"
KeyUserSub = "sub"
KeyUserIss = "iss"
ValNotPresent = "null"
)
func Middleware(rootLogger logr.Logger) func(handler http.Handler) http.Handler {
return func(handler http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx, span := otel.Tracer("").Start(r.Context(), "logging_middleware")
defer span.End()
// create a new logger with our tracing information
log := rootLogger.WithValues(
KeyTraceID, span.SpanContext().TraceID(),
KeySpanID, span.SpanContext().SpanID(),
)
var sub, iss = ValNotPresent, ValNotPresent
user, ok := client.GetContextUser(ctx)
// if there is a user present, capture
// their identity
if ok {
sub = user.Sub
iss = user.Iss
}
log = log.WithValues(
KeyUserSub, sub,
KeyUserIss, iss,
)
// continue as normal
handler.ServeHTTP(w, r.WithContext(logr.NewContext(ctx, log)))
})
}
}