forked from evergreen-ci/evergreen
/
agent.go
134 lines (119 loc) · 3.44 KB
/
agent.go
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package operations
import (
"context"
"os"
"os/signal"
"syscall"
"github.com/evergreen-ci/evergreen/agent"
"github.com/evergreen-ci/evergreen/command"
"github.com/evergreen-ci/evergreen/rest/client"
"github.com/mongodb/grip"
"github.com/mongodb/grip/message"
"github.com/mongodb/grip/recovery"
"github.com/pkg/errors"
"github.com/urfave/cli"
)
func Agent() cli.Command {
const (
hostIDFlagName = "host_id"
hostSecretFlagName = "host_secret"
apiServerFlagName = "api_server"
workingDirectoryFlagName = "working_directory"
logPrefixFlagName = "log_prefix"
statusPortFlagName = "status_port"
cleanupFlagName = "cleanup"
)
return cli.Command{
Name: "agent",
Usage: "run an evergreen agent",
Flags: []cli.Flag{
cli.StringFlag{
Name: hostIDFlagName,
Usage: "id of machine agent is running on",
},
cli.StringFlag{
Name: hostSecretFlagName,
Usage: "secret for the current host",
},
cli.StringFlag{
Name: apiServerFlagName,
Usage: "URL of the API server",
},
cli.StringFlag{
Name: workingDirectoryFlagName,
Usage: "working directory for the agent",
},
cli.StringFlag{
Name: logPrefixFlagName,
Value: "evg.agent",
Usage: "prefix for the agent's log filename",
},
cli.IntFlag{
Name: statusPortFlagName,
Value: 2285,
Usage: "port to run the status server",
},
cli.BoolFlag{
Name: cleanupFlagName,
Usage: "clean up working directory and processes (do not set for smoke tests)",
},
},
Before: mergeBeforeFuncs(
func(c *cli.Context) error {
grip.SetName("evergreen.agent")
return nil
},
requireStringFlag(apiServerFlagName),
requireStringFlag(hostIDFlagName),
requireStringFlag(hostSecretFlagName),
requireStringFlag(workingDirectoryFlagName),
),
Action: func(c *cli.Context) error {
opts := agent.Options{
HostID: c.String(hostIDFlagName),
HostSecret: c.String(hostSecretFlagName),
StatusPort: c.Int(statusPortFlagName),
LogPrefix: c.String(logPrefixFlagName),
WorkingDirectory: c.String(workingDirectoryFlagName),
Cleanup: c.Bool(cleanupFlagName),
}
if err := os.MkdirAll(opts.WorkingDirectory, 0777); err != nil {
return errors.Wrapf(err, "problem creating working directory '%s'", opts.WorkingDirectory)
}
grip.Info(message.Fields{
"message": "starting agent",
"commands": command.RegisteredCommandNames(),
"dir": opts.WorkingDirectory,
"host": opts.HostID,
})
comm := client.NewCommunicator(c.String("api_server"))
defer comm.Close()
agt := agent.New(opts, comm)
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
go hardShutdownForSignals(ctx, cancel)
sender, err := agent.GetSender(ctx, opts.LogPrefix, "init")
if err != nil {
return errors.Wrap(err, "problem configuring logger")
}
if err = grip.SetSender(sender); err != nil {
return errors.Wrap(err, "problem setting up logger")
}
err = agt.Start(ctx)
grip.Emergency(err)
return err
},
}
}
func hardShutdownForSignals(ctx context.Context, serviceCanceler context.CancelFunc) {
defer recovery.LogStackTraceAndExit("agent signal handler")
sigChan := make(chan os.Signal, 1)
signal.Notify(sigChan, syscall.SIGTERM)
select {
case <-ctx.Done():
case <-sigChan:
grip.Info("service exiting after receiving signal")
}
serviceCanceler()
os.Exit(2)
}