99 lines
2.0 KiB
Go
99 lines
2.0 KiB
Go
package uvm
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import (
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"context"
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"encoding/json"
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"io"
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"io/ioutil"
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"net"
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"syscall"
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"github.com/sirupsen/logrus"
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)
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const _ERROR_CONNECTION_ABORTED syscall.Errno = 1236
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var _ = (OutputHandler)(parseLogrus)
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func parseLogrus(r io.Reader) {
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j := json.NewDecoder(r)
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logger := logrus.StandardLogger()
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for {
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e := logrus.Entry{Logger: logger}
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err := j.Decode(&e.Data)
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if err == io.EOF || err == _ERROR_CONNECTION_ABORTED {
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break
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}
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if err != nil {
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// Something went wrong. Read the rest of the data as a single
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// string and log it at once -- it's probably a GCS panic stack.
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logrus.Error("gcs log read: ", err)
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rest, _ := ioutil.ReadAll(io.MultiReader(j.Buffered(), r))
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if len(rest) != 0 {
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logrus.Error("gcs stderr: ", string(rest))
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}
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break
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}
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msg := e.Data["msg"]
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delete(e.Data, "msg")
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lvl := e.Data["level"]
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delete(e.Data, "level")
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e.Data["vm.time"] = e.Data["time"]
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delete(e.Data, "time")
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switch lvl {
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case "debug":
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e.Debug(msg)
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case "info":
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e.Info(msg)
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case "warning":
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e.Warning(msg)
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case "error", "fatal":
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e.Error(msg)
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default:
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e.Info(msg)
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}
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}
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}
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type acceptResult struct {
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c net.Conn
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err error
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}
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func processOutput(ctx context.Context, l net.Listener, doneChan chan struct{}, handler OutputHandler) {
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defer close(doneChan)
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ch := make(chan acceptResult)
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go func() {
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c, err := l.Accept()
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ch <- acceptResult{c, err}
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}()
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select {
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case <-ctx.Done():
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l.Close()
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return
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case ar := <-ch:
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c, err := ar.c, ar.err
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l.Close()
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if err != nil {
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logrus.Error("accepting log socket: ", err)
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return
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}
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defer c.Close()
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handler(c)
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}
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}
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// Start synchronously starts the utility VM.
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func (uvm *UtilityVM) Start() error {
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if uvm.outputListener != nil {
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ctx, cancel := context.WithCancel(context.Background())
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go processOutput(ctx, uvm.outputListener, uvm.outputProcessingDone, uvm.outputHandler)
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uvm.outputProcessingCancel = cancel
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uvm.outputListener = nil
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}
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return uvm.hcsSystem.Start()
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}
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