150 lines
3.9 KiB
Go
150 lines
3.9 KiB
Go
/*
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* Copyright 2020 The Dragonfly Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package source
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import (
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"context"
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"net/url"
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"github.com/pkg/errors"
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)
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type Request struct {
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URL *url.URL
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Header Header
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// ctx is either the client or server context. It should only
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// be modified via copying the whole Request using WithContext.
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// It is unexported to prevent people from using Context wrong
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// and mutating the contexts held by callers of the same request.
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ctx context.Context
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}
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func NewRequest(rawURL string) (*Request, error) {
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u, err := url.Parse(rawURL)
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if err != nil {
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return nil, err
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}
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return &Request{
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URL: u,
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Header: make(Header),
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ctx: context.Background(),
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}, nil
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}
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func NewRequestWithHeader(rawURL string, header map[string]string) (*Request, error) {
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request, err := NewRequest(rawURL)
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if err != nil {
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return nil, err
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}
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for k, v := range header {
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request.Header.Add(k, v)
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}
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return request, nil
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}
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func NewRequestWithContext(ctx context.Context, rawURL string, header map[string]string) (*Request, error) {
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if ctx == nil {
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return nil, errors.New("nil Context")
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}
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u, err := url.Parse(rawURL)
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if err != nil {
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return nil, err
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}
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req := &Request{
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ctx: ctx,
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URL: u,
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Header: make(Header),
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}
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for k, v := range header {
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req.Header.Add(k, v)
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}
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return req, nil
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}
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// Context returns the request's context. To change the context, use
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// WithContext.
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//
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// The returned context is always non-nil; it defaults to the
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// background context.
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//
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// For outgoing client requests, the context controls cancellation.
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//
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// For incoming server requests, the context is canceled when the
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// client's connection closes, the request is canceled (with HTTP/2),
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// or when the ServeHTTP method returns.
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func (r *Request) Context() context.Context {
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if r.ctx != nil {
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return r.ctx
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}
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return context.Background()
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}
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// WithContext returns a shallow copy of r with its context changed
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// to ctx. The provided ctx must be non-nil.
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//
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// For outgoing client request, the context controls the entire
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// lifetime of a request and its response: obtaining a connection,
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// sending the request, and reading the response headers and body.
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//
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// To create a new request with a context, use NewRequestWithContext.
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// To change the context of a request, such as an incoming request you
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// want to modify before sending back out, use Request.Clone. Between
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// those two uses, it's rare to need WithContext.
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func (r *Request) WithContext(ctx context.Context) *Request {
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if ctx == nil {
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panic("nil context")
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}
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r2 := new(Request)
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*r2 = *r
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r2.ctx = ctx
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r2.URL = cloneURL(r.URL) // legacy behavior; TODO: try to remove. Issue 23544
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return r2
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}
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func cloneURL(u *url.URL) *url.URL {
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if u == nil {
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return nil
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}
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u2 := new(url.URL)
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*u2 = *u
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if u.User != nil {
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u2.User = new(url.Userinfo)
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*u2.User = *u.User
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}
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return u2
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}
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// Clone returns a deep copy of r with its context changed to ctx.
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// The provided ctx must be non-nil.
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//
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// For an outgoing client request, the context controls the entire
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// lifetime of a request and its response: obtaining a connection,
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// sending the request, and reading the response headers and body.
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func (r *Request) Clone(ctx context.Context) *Request {
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if ctx == nil {
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panic("nil context")
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}
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r2 := new(Request)
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*r2 = *r
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r2.ctx = ctx
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r2.URL = cloneURL(r.URL)
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if r.Header != nil {
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r2.Header = r.Header.Clone()
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}
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return r2
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}
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