woodpecker/cmd/agent/agent.go

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// Copyright 2018 Drone.IO Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// 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
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
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package main
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import (
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"context"
"crypto/tls"
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"net/http"
"os"
"runtime"
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"sync"
"github.com/rs/zerolog"
"github.com/rs/zerolog/log"
"github.com/tevino/abool"
"github.com/urfave/cli/v2"
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"google.golang.org/grpc"
grpccredentials "google.golang.org/grpc/credentials"
"google.golang.org/grpc/credentials/insecure"
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"google.golang.org/grpc/keepalive"
"google.golang.org/grpc/metadata"
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"github.com/woodpecker-ci/woodpecker/agent"
"github.com/woodpecker-ci/woodpecker/pipeline/backend"
"github.com/woodpecker-ci/woodpecker/pipeline/rpc"
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)
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func loop(c *cli.Context) error {
filter := rpc.Filter{
Labels: map[string]string{
"platform": runtime.GOOS + "/" + runtime.GOARCH,
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},
Expr: c.String("filter"),
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}
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hostname := c.String("hostname")
if len(hostname) == 0 {
hostname, _ = os.Hostname()
}
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if c.Bool("pretty") {
log.Logger = log.Output(
zerolog.ConsoleWriter{
Out: os.Stderr,
NoColor: c.Bool("nocolor"),
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},
)
}
zerolog.SetGlobalLevel(zerolog.WarnLevel)
if zerolog.GlobalLevel() <= zerolog.DebugLevel {
log.Logger = log.With().Caller().Logger()
}
if c.IsSet("log-level") {
logLevelFlag := c.String("log-level")
lvl, err := zerolog.ParseLevel(logLevelFlag)
if err != nil {
log.Fatal().Msgf("unknown logging level: %s", logLevelFlag)
}
zerolog.SetGlobalLevel(lvl)
}
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counter.Polling = c.Int("max-procs")
counter.Running = 0
if c.Bool("healthcheck") {
go func() {
if err := http.ListenAndServe(":3000", nil); err != nil {
log.Error().Msgf("can not listen on port 3000: %v", err)
}
}()
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}
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// TODO pass version information to grpc server
// TODO authenticate to grpc server
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// grpc.Dial(target, ))
var transport grpc.DialOption
if c.Bool("grpc-secure") {
transport = grpc.WithTransportCredentials(grpccredentials.NewTLS(&tls.Config{InsecureSkipVerify: c.Bool("skip-insecure-grpc")}))
} else {
transport = grpc.WithTransportCredentials(insecure.NewCredentials())
}
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conn, err := grpc.Dial(
c.String("server"),
transport,
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grpc.WithPerRPCCredentials(&credentials{
username: c.String("grpc-username"),
password: c.String("grpc-password"),
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}),
grpc.WithKeepaliveParams(keepalive.ClientParameters{
Time: c.Duration("grpc-keepalive-time"),
Timeout: c.Duration("grpc-keepalive-timeout"),
}),
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)
if err != nil {
return err
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}
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defer conn.Close()
client := rpc.NewGrpcClient(conn)
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sigterm := abool.New()
ctx := metadata.NewOutgoingContext(
context.Background(),
metadata.Pairs("hostname", hostname),
)
ctx = WithContextFunc(ctx, func() {
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println("ctrl+c received, terminating process")
sigterm.Set()
})
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var wg sync.WaitGroup
parallel := c.Int("max-procs")
wg.Add(parallel)
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for i := 0; i < parallel; i++ {
go func() {
defer wg.Done()
for {
if sigterm.IsSet() {
return
}
// new engine
engine, err := backend.FindEngine(c.String("backend-engine"))
if err != nil {
log.Error().Err(err).Msgf("cannot find backend engine '%s'", c.String("backend-engine"))
return
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}
// load engine (e.g. init api client)
err = engine.Load()
if err != nil {
log.Error().Err(err).Msg("cannot load backend engine")
return
}
log.Debug().Msgf("loaded %s backend engine", engine.Name())
r := agent.NewRunner(client, filter, hostname, counter, &engine)
if err := r.Run(ctx); err != nil {
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log.Error().Err(err).Msg("pipeline done with error")
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return
}
}
}()
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}
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wg.Wait()
return nil
}
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type credentials struct {
username string
password string
}
func (c *credentials) GetRequestMetadata(context.Context, ...string) (map[string]string, error) {
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return map[string]string{
"username": c.username,
"password": c.password,
}, nil
}
func (c *credentials) RequireTransportSecurity() bool {
return false
}