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interceptors.x-request-id.go
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interceptors.x-request-id.go
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// Copyright 2022 The searKing Author. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package http
import (
"context"
"net/http"
)
// DefaultXRequestIDKey is metadata key name for request ID
var DefaultXRequestIDKey = "X-Request-ID"
// SetInOutMetadata injects requestIDs in req|resp's Header and context
// 将request-id追加注入请求|响应头及context中
func SetInOutMetadata(ctx context.Context, w http.ResponseWriter, r *http.Request, requestID string) context.Context {
if r != nil {
r.Header.Set(DefaultXRequestIDKey, requestID)
}
if w != nil {
w.Header().Set(DefaultXRequestIDKey, requestID)
}
return context.WithValue(ctx, DefaultXRequestIDKey, requestID)
}
// FromHTTPContext parse request id from gin.Context
// query | header | post form | context
// 从请求中提取request-id
func FromHTTPContext(r *http.Request, keys ...interface{}) string {
key := DefaultXRequestIDKey
if requestID := r.Header.Get(key); requestID != "" {
return requestID
}
if requestID := r.URL.Query().Get(key); requestID != "" {
return requestID
}
if requestID := r.FormValue(key); requestID != "" {
return requestID
}
if requestID := r.PostFormValue(key); requestID != "" {
return requestID
}
switch requestIDs := r.Context().Value(key).(type) {
case string:
if requestIDs != "" {
return requestIDs
}
case []string:
if len(requestIDs) > 0 {
return requestIDs[0]
}
}
return fromContext(r.Context(), keys...)
}
// fromContext takes out first value from context by keys
func fromContext(ctx context.Context, keys ...interface{}) string {
for _, key := range keys {
val := ctx.Value(key)
switch val := val.(type) {
case string:
if val != "" {
return val
}
case []string:
if len(val) > 0 {
if val[0] != "" {
return val[0]
}
}
}
}
return ""
}
func RequestIDFromContext(ctx context.Context) string {
switch requestIDs := ctx.Value(DefaultXRequestIDKey).(type) {
case string:
return requestIDs
case []string:
if len(requestIDs) > 0 {
return requestIDs[0]
}
}
return ""
}