context.go

// Copyright 2016 CoreOS, Inc.
//
// 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 web

import (
	"context"
	"net/http"
)

// ContextHandler handles ServeHTTP with context.
type ContextHandler interface {
	ServeHTTPContext(context.Context, http.ResponseWriter, *http.Request) error
}

// ContextHandlerFunc defines HandlerFunc function signature to wrap context.
type ContextHandlerFunc func(context.Context, http.ResponseWriter, *http.Request) error

// ServeHTTPContext serve HTTP requests with context.
func (f ContextHandlerFunc) ServeHTTPContext(ctx context.Context, w http.ResponseWriter, req *http.Request) error {
	return f(ctx, w, req)
}

// ContextAdapter wraps context handler.
type ContextAdapter struct {
	ctx     context.Context
	handler ContextHandler
}

func (ca *ContextAdapter) ServeHTTP(w http.ResponseWriter, req *http.Request) {
	if err := ca.handler.ServeHTTPContext(ca.ctx, w, req); err != nil {
		lg.Warnf("ServeHTTP (%v) [method: %q | path: %q]", err, req.Method, req.URL.Path)
	}
}