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add basic command framework and apiserver

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Lei Xue
2016-08-27 20:07:03 +08:00
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Apache License
Version 2.0, January 2004
https://www.apache.org/licenses/
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any Contribution intentionally submitted for inclusion in the Work
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
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Copyright (c) 2009 The Go Authors. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build go1.5
package cancellable
import (
"net/http"
"github.com/gostor/gotgt/pkg/api/client/transport"
)
func canceler(client transport.Sender, req *http.Request) func() {
// TODO(djd): Respect any existing value of req.Cancel.
ch := make(chan struct{})
req.Cancel = ch
return func() {
close(ch)
}
}

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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build !go1.5
package cancellable
import (
"net/http"
"github.com/gostor/gotgt/pkg/api/client/transport"
)
type requestCanceler interface {
CancelRequest(*http.Request)
}
func canceler(client transport.Sender, req *http.Request) func() {
rc, ok := client.(requestCanceler)
if !ok {
return func() {}
}
return func() {
rc.CancelRequest(req)
}
}

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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package cancellable provides helper function to cancel http requests.
package cancellable
import (
"io"
"net/http"
"github.com/gostor/gotgt/pkg/api/client/transport"
"golang.org/x/net/context"
)
func nop() {}
var (
testHookContextDoneBeforeHeaders = nop
testHookDoReturned = nop
testHookDidBodyClose = nop
)
// Do sends an HTTP request with the provided transport.Sender and returns an HTTP response.
// If the client is nil, http.DefaultClient is used.
// If the context is canceled or times out, ctx.Err() will be returned.
//
// FORK INFORMATION:
//
// This function deviates from the upstream version in golang.org/x/net/context/ctxhttp by
// taking a Sender interface rather than a *http.Client directly. That allow us to use
// this funcion with mocked clients and hijacked connections.
func Do(ctx context.Context, client transport.Sender, req *http.Request) (*http.Response, error) {
if client == nil {
client = http.DefaultClient
}
// Request cancelation changed in Go 1.5, see canceler.go and canceler_go14.go.
cancel := canceler(client, req)
type responseAndError struct {
resp *http.Response
err error
}
result := make(chan responseAndError, 1)
go func() {
resp, err := client.Do(req)
testHookDoReturned()
result <- responseAndError{resp, err}
}()
var resp *http.Response
select {
case <-ctx.Done():
testHookContextDoneBeforeHeaders()
cancel()
// Clean up after the goroutine calling client.Do:
go func() {
if r := <-result; r.resp != nil && r.resp.Body != nil {
testHookDidBodyClose()
r.resp.Body.Close()
}
}()
return nil, ctx.Err()
case r := <-result:
var err error
resp, err = r.resp, r.err
if err != nil {
return resp, err
}
}
c := make(chan struct{})
go func() {
select {
case <-ctx.Done():
cancel()
case <-c:
// The response's Body is closed.
}
}()
resp.Body = &notifyingReader{resp.Body, c}
return resp, nil
}
// notifyingReader is an io.ReadCloser that closes the notify channel after
// Close is called or a Read fails on the underlying ReadCloser.
type notifyingReader struct {
io.ReadCloser
notify chan<- struct{}
}
func (r *notifyingReader) Read(p []byte) (int, error) {
n, err := r.ReadCloser.Read(p)
if err != nil && r.notify != nil {
close(r.notify)
r.notify = nil
}
return n, err
}
func (r *notifyingReader) Close() error {
err := r.ReadCloser.Close()
if r.notify != nil {
close(r.notify)
r.notify = nil
}
return err
}

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package transport
import (
"crypto/tls"
"net/http"
)
// Sender is an interface that clients must implement
// to be able to send requests to a remote connection.
type Sender interface {
// Do sends request to a remote endpoint.
Do(*http.Request) (*http.Response, error)
}
// Client is an interface that abstracts all remote connections.
type Client interface {
Sender
// Secure tells whether the connection is secure or not.
Secure() bool
// Scheme returns the connection protocol the client uses.
Scheme() string
// TLSConfig returns any TLS configuration the client uses.
TLSConfig() *tls.Config
}
// tlsInfo returns information about the TLS configuration.
type tlsInfo struct {
tlsConfig *tls.Config
}
// TLSConfig returns the TLS configuration.
func (t *tlsInfo) TLSConfig() *tls.Config {
return t.tlsConfig
}
// Scheme returns protocol scheme to use.
func (t *tlsInfo) Scheme() string {
if t.tlsConfig != nil {
return "https"
}
return "http"
}
// Secure returns true if there is a TLS configuration.
func (t *tlsInfo) Secure() bool {
return t.tlsConfig != nil
}

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// Package transport provides function to send request to remote endpoints.
package transport
import (
"fmt"
"net/http"
"github.com/docker/go-connections/sockets"
)
// apiTransport holds information about the http transport to connect with the API.
type apiTransport struct {
*http.Client
*tlsInfo
transport *http.Transport
}
// NewTransportWithHTTP creates a new transport based on the provided proto, address and http client.
// It uses Docker's default http transport configuration if the client is nil.
// It does not modify the client's transport if it's not nil.
func NewTransportWithHTTP(proto, addr string, client *http.Client) (Client, error) {
var transport *http.Transport
if client != nil {
tr, ok := client.Transport.(*http.Transport)
if !ok {
return nil, fmt.Errorf("unable to verify TLS configuration, invalid transport %v", client.Transport)
}
transport = tr
} else {
transport = defaultTransport(proto, addr)
client = &http.Client{
Transport: transport,
}
}
return &apiTransport{
Client: client,
tlsInfo: &tlsInfo{transport.TLSClientConfig},
transport: transport,
}, nil
}
// CancelRequest stops a request execution.
func (a *apiTransport) CancelRequest(req *http.Request) {
a.transport.CancelRequest(req)
}
// defaultTransport creates a new http.Transport with Docker's
// default transport configuration.
func defaultTransport(proto, addr string) *http.Transport {
tr := new(http.Transport)
sockets.ConfigureTransport(tr, proto, addr)
return tr
}
var _ Client = &apiTransport{}