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woodpecker/drone/agent/agent.go

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package agent
import (
"os"
"os/signal"
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"strings"
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"sync"
"syscall"
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"time"
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"github.com/drone/drone/model"
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"github.com/drone/mq/logger"
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"github.com/drone/mq/stomp"
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"github.com/tidwall/redlog"
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"github.com/Sirupsen/logrus"
"github.com/codegangsta/cli"
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"github.com/samalba/dockerclient"
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)
// AgentCmd is the exported command for starting the drone agent.
var AgentCmd = cli.Command{
Name: "agent",
Usage: "starts the drone agent",
Action: start,
Flags: []cli.Flag{
cli.StringFlag{
EnvVar: "DOCKER_HOST",
Name: "docker-host",
Usage: "docker deamon address",
Value: "unix:///var/run/docker.sock",
},
cli.BoolFlag{
EnvVar: "DOCKER_TLS_VERIFY",
Name: "docker-tls-verify",
Usage: "docker daemon supports tlsverify",
},
cli.StringFlag{
EnvVar: "DOCKER_CERT_PATH",
Name: "docker-cert-path",
Usage: "docker certificate directory",
Value: "",
},
cli.IntFlag{
EnvVar: "DOCKER_MAX_PROCS",
Name: "docker-max-procs",
Usage: "limit number of running docker processes",
Value: 2,
},
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cli.StringFlag{
EnvVar: "DOCKER_OS",
Name: "docker-os",
Usage: "docker operating system",
Value: "linux",
},
cli.StringFlag{
EnvVar: "DOCKER_ARCH",
Name: "docker-arch",
Usage: "docker architecture system",
Value: "amd64",
},
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cli.StringFlag{
EnvVar: "DRONE_SERVER",
Name: "drone-server",
Usage: "drone server address",
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Value: "ws://localhost:8000/ws/broker",
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},
cli.StringFlag{
EnvVar: "DRONE_TOKEN",
Name: "drone-token",
Usage: "drone authorization token",
},
cli.StringFlag{
EnvVar: "DRONE_SECRET,DRONE_AGENT_SECRET",
Name: "drone-secret",
Usage: "drone agent secret",
},
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cli.DurationFlag{
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EnvVar: "DRONE_BACKOFF",
Name: "backoff",
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Usage: "drone server backoff interval",
Value: time.Second * 15,
},
cli.DurationFlag{
EnvVar: "DRONE_PING",
Name: "ping",
Usage: "drone server ping frequency",
Value: time.Minute * 5,
},
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cli.BoolFlag{
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EnvVar: "DRONE_DEBUG",
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Name: "debug",
Usage: "start the agent in debug mode",
},
cli.DurationFlag{
EnvVar: "DRONE_TIMEOUT",
Name: "timeout",
Usage: "drone timeout due to log inactivity",
Value: time.Minute * 15,
},
cli.StringFlag{
EnvVar: "DRONE_FILTER",
Name: "filter",
Usage: "filter jobs processed by this agent",
},
cli.IntFlag{
EnvVar: "DRONE_MAX_LOGS",
Name: "max-log-size",
Usage: "drone maximum log size in megabytes",
Value: 5,
},
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cli.StringSliceFlag{
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EnvVar: "DRONE_PLUGIN_PRIVILEGED",
Name: "privileged",
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Usage: "plugins that require privileged mode",
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Value: &cli.StringSlice{
"plugins/docker",
"plugins/docker:*",
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"plugins/gcr",
"plugins/gcr:*",
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"plugins/ecr",
"plugins/ecr:*",
},
},
cli.StringFlag{
EnvVar: "DRONE_PLUGIN_NAMESPACE",
Name: "namespace",
Value: "plugins",
Usage: "default plugin image namespace",
},
cli.BoolTFlag{
EnvVar: "DRONE_PLUGIN_PULL",
Name: "pull",
Usage: "always pull latest plugin images",
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},
cli.StringFlag{
EnvVar: "DRONE_YAML_EXTENSION",
Name: "extension",
Usage: "custom plugin extension endpoint",
},
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},
}
func start(c *cli.Context) {
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log := redlog.New(os.Stderr)
log.SetLevel(0)
logger.SetLogger(log)
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// debug level if requested by user
if c.Bool("debug") {
logrus.SetLevel(logrus.DebugLevel)
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log.SetLevel(1)
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} else {
logrus.SetLevel(logrus.WarnLevel)
}
var accessToken string
if c.String("drone-secret") != "" {
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// secretToken := c.String("drone-secret")
accessToken = c.String("drone-secret")
// accessToken, _ = token.New(token.AgentToken, "").Sign(secretToken)
} else {
accessToken = c.String("drone-token")
}
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logger.Noticef("connecting to server %s", c.String("drone-server"))
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server := strings.TrimRight(c.String("drone-server"), "/")
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tls, err := dockerclient.TLSConfigFromCertPath(c.String("docker-cert-path"))
if err == nil {
tls.InsecureSkipVerify = c.Bool("docker-tls-verify")
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}
docker, err := dockerclient.NewDockerClient(c.String("docker-host"), tls)
if err != nil {
logrus.Fatal(err)
}
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var client *stomp.Client
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handler := func(m *stomp.Message) {
running.Add(1)
defer func() {
running.Done()
client.Ack(m.Ack)
}()
r := pipeline{
drone: client,
docker: docker,
config: config{
platform: c.String("docker-os") + "/" + c.String("docker-arch"),
timeout: c.Duration("timeout"),
namespace: c.String("namespace"),
privileged: c.StringSlice("privileged"),
pull: c.BoolT("pull"),
logs: int64(c.Int("max-log-size")) * 1000000,
extension: c.String("extension"),
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},
}
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work := new(model.Work)
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m.Unmarshal(work)
r.run(work)
}
handleSignals()
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backoff := c.Duration("backoff")
for {
// dial the drone server to establish a TCP connection.
client, err = stomp.Dial(server)
if err != nil {
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logger.Warningf("connection failed, retry in %v. %s", backoff, err)
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<-time.After(backoff)
continue
}
opts := []stomp.MessageOption{
stomp.WithCredentials("x-token", accessToken),
}
// initialize the stomp session and authenticate.
if err = client.Connect(opts...); err != nil {
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logger.Warningf("session failed, retry in %v. %s", backoff, err)
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<-time.After(backoff)
continue
}
opts = []stomp.MessageOption{
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stomp.WithAck("client"),
stomp.WithPrefetch(
c.Int("docker-max-procs"),
),
}
if filter := c.String("filter"); filter != "" {
opts = append(opts, stomp.WithSelector(filter))
}
// subscribe to the pending build queue.
client.Subscribe("/queue/pending", stomp.HandlerFunc(func(m *stomp.Message) {
go handler(m) // HACK until we a channel based Subscribe implementation
}), opts...)
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logger.Noticef("connection established, ready to process builds.")
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<-client.Done()
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logger.Warningf("connection interrupted, attempting to reconnect.")
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}
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}
// tracks running builds
var running sync.WaitGroup
func handleSignals() {
// Graceful shut-down on SIGINT/SIGTERM
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
signal.Notify(c, syscall.SIGTERM)
go func() {
<-c
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logger.Warningf("SIGTERM received.")
logger.Warningf("wait for running builds to finish.")
running.Wait()
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logger.Warningf("done.")
os.Exit(0)
}()
}