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https://github.com/aljazceru/kata-containers.git
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5a9ff3c235
When specified, it does not spawn a new process to proxy kata grpc connections. Instead, the yamux multiplexing functionality is builtin in the kata agent dialer. Signed-off-by: Peng Tao <bergwolf@gmail.com>
104 lines
2.5 KiB
Go
104 lines
2.5 KiB
Go
//
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// Copyright (c) 2018 HyperHQ Inc.
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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 virtcontainers
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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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"github.com/sirupsen/logrus"
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)
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// This is a kata builtin proxy implementation of the proxy interface. Kata proxy
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// functionality is implemented inside the virtcontainers library.
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type kataBuiltInProxy struct {
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podID string
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conn net.Conn
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}
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// start is the proxy start implementation for kata builtin proxy.
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// It starts the console watcher for the guest.
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// It returns agentURL to let agent connect directly.
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func (p *kataBuiltInProxy) start(pod Pod, params proxyParams) (int, string, error) {
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if p.conn != nil {
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return -1, "", fmt.Errorf("kata builtin proxy running for pod %s", p.podID)
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}
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p.podID = pod.id
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console := pod.hypervisor.getPodConsole(pod.id)
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err := p.watchConsole(consoleProtoUnix, console, params.logger)
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if err != nil {
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return -1, "", err
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}
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return -1, params.agentURL, nil
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}
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// stop is the proxy stop implementation for kata builtin proxy.
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func (p *kataBuiltInProxy) stop(pod Pod, pid int) error {
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if p.conn != nil {
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p.conn.Close()
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p.conn = nil
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p.podID = ""
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}
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return nil
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}
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func (p *kataBuiltInProxy) watchConsole(proto, console string, logger *logrus.Entry) (err error) {
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var (
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scanner *bufio.Scanner
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conn net.Conn
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)
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switch proto {
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case consoleProtoUnix:
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conn, err = net.Dial("unix", console)
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if err != nil {
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return err
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}
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// TODO: add pty console support for kvmtools
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case consoleProtoPty:
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fallthrough
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default:
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return fmt.Errorf("unknown console proto %s", proto)
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}
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p.conn = conn
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go func() {
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scanner = bufio.NewScanner(conn)
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for scanner.Scan() {
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fmt.Printf("[POD-%s] vmconsole: %s\n", p.podID, scanner.Text())
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}
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if err := scanner.Err(); err != nil {
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if err == io.EOF {
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logger.Info("console watcher quits")
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} else {
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logger.WithError(err).WithFields(logrus.Fields{
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"console-protocol": proto,
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"console-socket": console,
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}).Error("Failed to read agent logs")
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}
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}
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}()
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return nil
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}
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