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6b65b0c982
Tested with `kind` and GKE. Note: "nodes" shown in `docker buildx ls` are unrelated to Kubernetes "nodes". Probably buildx should come up with an alternative term. Usage: $ kind create cluster $ export KUBECONFIG="$(kind get kubeconfig-path --name="kind")" $ docker buildx create --driver kubernetes --driver-opt replicas=3 --use $ docker buildx build -t foo --load . `--load` loads the image into the local Docker. Driver opts: - `image=IMAGE` - Sets the container image to be used for running buildkit. - `namespace=NS` - Sets the Kubernetes namespace. Defaults to the current namespace. - `replicas=N` - Sets the number of `Pod` replicas. Defaults to 1. - `rootless=(true|false)` - Run the container as a non-root user without `securityContext.privileged`. Defaults to false. - `loadbalance=(sticky|random)` - Load-balancing strategy. If set to "sticky", the pod is chosen using the hash of the context path. Defaults to "sticky" Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
108 lines
3.4 KiB
Go
108 lines
3.4 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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 spdy
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import (
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"bufio"
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"fmt"
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"io"
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"net"
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"net/http"
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"strings"
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"sync/atomic"
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"k8s.io/apimachinery/pkg/util/httpstream"
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"k8s.io/apimachinery/pkg/util/runtime"
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)
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const HeaderSpdy31 = "SPDY/3.1"
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// responseUpgrader knows how to upgrade HTTP responses. It
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// implements the httpstream.ResponseUpgrader interface.
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type responseUpgrader struct {
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}
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// connWrapper is used to wrap a hijacked connection and its bufio.Reader. All
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// calls will be handled directly by the underlying net.Conn with the exception
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// of Read and Close calls, which will consider data in the bufio.Reader. This
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// ensures that data already inside the used bufio.Reader instance is also
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// read.
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type connWrapper struct {
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net.Conn
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closed int32
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bufReader *bufio.Reader
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}
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func (w *connWrapper) Read(b []byte) (n int, err error) {
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if atomic.LoadInt32(&w.closed) == 1 {
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return 0, io.EOF
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}
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return w.bufReader.Read(b)
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}
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func (w *connWrapper) Close() error {
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err := w.Conn.Close()
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atomic.StoreInt32(&w.closed, 1)
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return err
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}
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// NewResponseUpgrader returns a new httpstream.ResponseUpgrader that is
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// capable of upgrading HTTP responses using SPDY/3.1 via the
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// spdystream package.
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func NewResponseUpgrader() httpstream.ResponseUpgrader {
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return responseUpgrader{}
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}
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// UpgradeResponse upgrades an HTTP response to one that supports multiplexed
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// streams. newStreamHandler will be called synchronously whenever the
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// other end of the upgraded connection creates a new stream.
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func (u responseUpgrader) UpgradeResponse(w http.ResponseWriter, req *http.Request, newStreamHandler httpstream.NewStreamHandler) httpstream.Connection {
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connectionHeader := strings.ToLower(req.Header.Get(httpstream.HeaderConnection))
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upgradeHeader := strings.ToLower(req.Header.Get(httpstream.HeaderUpgrade))
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if !strings.Contains(connectionHeader, strings.ToLower(httpstream.HeaderUpgrade)) || !strings.Contains(upgradeHeader, strings.ToLower(HeaderSpdy31)) {
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w.WriteHeader(http.StatusBadRequest)
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fmt.Fprintf(w, "unable to upgrade: missing upgrade headers in request: %#v", req.Header)
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return nil
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}
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hijacker, ok := w.(http.Hijacker)
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if !ok {
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w.WriteHeader(http.StatusInternalServerError)
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fmt.Fprintf(w, "unable to upgrade: unable to hijack response")
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return nil
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}
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w.Header().Add(httpstream.HeaderConnection, httpstream.HeaderUpgrade)
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w.Header().Add(httpstream.HeaderUpgrade, HeaderSpdy31)
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w.WriteHeader(http.StatusSwitchingProtocols)
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conn, bufrw, err := hijacker.Hijack()
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if err != nil {
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runtime.HandleError(fmt.Errorf("unable to upgrade: error hijacking response: %v", err))
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return nil
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}
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connWithBuf := &connWrapper{Conn: conn, bufReader: bufrw.Reader}
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spdyConn, err := NewServerConnection(connWithBuf, newStreamHandler)
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if err != nil {
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runtime.HandleError(fmt.Errorf("unable to upgrade: error creating SPDY server connection: %v", err))
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return nil
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}
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return spdyConn
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}
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