woodpecker/cmd/agent/agent.go

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// Copyright 2023 Woodpecker Authors
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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"
"errors"
"fmt"
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"net/http"
"os"
"strings"
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"sync"
"time"
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"github.com/rs/zerolog/log"
"github.com/tevino/abool/v2"
"github.com/urfave/cli/v2"
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"google.golang.org/grpc"
"google.golang.org/grpc/codes"
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"
"google.golang.org/grpc/status"
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"go.woodpecker-ci.org/woodpecker/v2/agent"
agentRpc "go.woodpecker-ci.org/woodpecker/v2/agent/rpc"
"go.woodpecker-ci.org/woodpecker/v2/pipeline/backend"
"go.woodpecker-ci.org/woodpecker/v2/pipeline/backend/types"
"go.woodpecker-ci.org/woodpecker/v2/pipeline/rpc"
"go.woodpecker-ci.org/woodpecker/v2/shared/addon"
addonTypes "go.woodpecker-ci.org/woodpecker/v2/shared/addon/types"
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"go.woodpecker-ci.org/woodpecker/v2/shared/logger"
"go.woodpecker-ci.org/woodpecker/v2/shared/utils"
"go.woodpecker-ci.org/woodpecker/v2/version"
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)
func run(c *cli.Context) error {
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agentConfigPath := c.String("agent-config")
hostname := c.String("hostname")
if len(hostname) == 0 {
hostname, _ = os.Hostname()
}
counter.Polling = c.Int("max-workflows")
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counter.Running = 0
if c.Bool("healthcheck") {
go func() {
if err := http.ListenAndServe(c.String("healthcheck-addr"), nil); err != nil {
log.Error().Err(err).Msgf("cannot listen on address %s", c.String("healthcheck-addr"))
}
}()
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}
var transport grpc.DialOption
if c.Bool("grpc-secure") {
transport = grpc.WithTransportCredentials(grpccredentials.NewTLS(&tls.Config{InsecureSkipVerify: c.Bool("grpc-skip-insecure")}))
} else {
transport = grpc.WithTransportCredentials(insecure.NewCredentials())
}
authConn, err := grpc.Dial(
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c.String("server"),
transport,
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
}
defer authConn.Close()
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agentConfig := readAgentConfig(agentConfigPath)
agentToken := c.String("grpc-token")
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authClient := agentRpc.NewAuthGrpcClient(authConn, agentToken, agentConfig.AgentID)
authInterceptor, err := agentRpc.NewAuthInterceptor(authClient, 30*time.Minute)
if err != nil {
return err
}
conn, err := grpc.Dial(
c.String("server"),
transport,
grpc.WithKeepaliveParams(keepalive.ClientParameters{
Time: c.Duration("grpc-keepalive-time"),
Timeout: c.Duration("grpc-keepalive-timeout"),
}),
grpc.WithUnaryInterceptor(authInterceptor.Unary()),
grpc.WithStreamInterceptor(authInterceptor.Stream()),
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)
if err != nil {
return err
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}
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defer conn.Close()
client := agentRpc.NewGrpcClient(conn)
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sigterm := abool.New()
ctx := metadata.NewOutgoingContext(
context.Background(),
metadata.Pairs("hostname", hostname),
)
agentConfigPersisted := abool.New()
ctx = utils.WithContextSigtermCallback(ctx, func() {
log.Info().Msg("termination signal is received, shutting down")
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sigterm.Set()
// Remove stateless agents from server
if agentConfigPersisted.IsNotSet() {
log.Debug().Msg("unregistering agent from server")
err := client.UnregisterAgent(ctx)
if err != nil {
log.Err(err).Msg("failed to unregister agent from server")
}
}
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})
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// check if grpc server version is compatible with agent
grpcServerVersion, err := client.Version(ctx)
if err != nil {
log.Error().Err(err).Msg("could not get grpc server version")
return err
}
if grpcServerVersion.GrpcVersion != agentRpc.ClientGrpcVersion {
err := errors.New("GRPC version mismatch")
log.Error().Err(err).Msgf("server version %s does report grpc version %d but we only understand %d",
grpcServerVersion.ServerVersion,
grpcServerVersion.GrpcVersion,
agentRpc.ClientGrpcVersion)
return err
}
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var wg sync.WaitGroup
parallel := c.Int("max-workflows")
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wg.Add(parallel)
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// new engine
backendCtx := context.WithValue(ctx, types.CliContext, c)
backendEngine, err := getBackendEngine(backendCtx, c.String("backend-engine"), c.StringSlice("addons"))
if err != nil {
return err
}
if !backendEngine.IsAvailable(backendCtx) {
log.Error().Str("engine", backendEngine.Name()).Msg("selected backend engine is unavailable")
return fmt.Errorf("selected backend engine %s is unavailable", backendEngine.Name())
}
// load engine (e.g. init api client)
engInfo, err := backendEngine.Load(backendCtx)
if err != nil {
log.Error().Err(err).Msg("cannot load backend engine")
return err
}
log.Debug().Msgf("loaded %s backend engine", backendEngine.Name())
agentConfig.AgentID, err = client.RegisterAgent(ctx, engInfo.Platform, backendEngine.Name(), version.String(), parallel)
if err != nil {
return err
}
if agentConfigPath != "" {
if err := writeAgentConfig(agentConfig, agentConfigPath); err == nil {
agentConfigPersisted.Set()
}
}
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labels := map[string]string{
"hostname": hostname,
"platform": engInfo.Platform,
"backend": backendEngine.Name(),
"repo": "*", // allow all repos by default
}
if err := stringSliceAddToMap(c.StringSlice("filter"), labels); err != nil {
return err
}
filter := rpc.Filter{
Labels: labels,
}
log.Debug().Msgf("agent registered with ID %d", agentConfig.AgentID)
go func() {
for {
if sigterm.IsSet() {
log.Debug().Msg("terminating health reporting")
return
}
err := client.ReportHealth(ctx)
if err != nil {
log.Err(err).Msg("failed to report health")
return
}
<-time.After(time.Second * 10)
}
}()
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for i := 0; i < parallel; i++ {
i := i
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go func() {
defer wg.Done()
r := agent.NewRunner(client, filter, hostname, counter, &backendEngine)
log.Debug().Msgf("created new runner %d", i)
for {
if sigterm.IsSet() {
log.Debug().Msgf("terminating runner %d", i)
return
}
log.Debug().Msg("polling new steps")
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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}
log.Info().Msgf(
"starting Woodpecker agent with version '%s' and backend '%s' using platform '%s' running up to %d pipelines in parallel",
version.String(), backendEngine.Name(), engInfo.Platform, parallel)
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wg.Wait()
return nil
}
func getBackendEngine(backendCtx context.Context, backendName string, addons []string) (types.Backend, error) {
addonBackend, err := addon.Load[types.Backend](addons, addonTypes.TypeBackend)
if err != nil {
log.Error().Err(err).Msg("cannot load backend addon")
return nil, err
}
if addonBackend != nil {
return addonBackend.Value, nil
}
backend.Init()
engine, err := backend.FindBackend(backendCtx, backendName)
if err != nil {
log.Error().Err(err).Msgf("cannot find backend engine '%s'", backendName)
return nil, err
}
return engine, nil
}
func runWithRetry(context *cli.Context) error {
if err := logger.SetupGlobalLogger(context, true); err != nil {
return err
}
initHealth()
retryCount := context.Int("connect-retry-count")
retryDelay := context.Duration("connect-retry-delay")
var err error
for i := 0; i < retryCount; i++ {
if err = run(context); status.Code(err) == codes.Unavailable {
log.Warn().Err(err).Msg(fmt.Sprintf("cannot connect to server, retrying in %v", retryDelay))
time.Sleep(retryDelay)
} else {
break
}
}
return err
}
func stringSliceAddToMap(sl []string, m map[string]string) error {
if m == nil {
m = make(map[string]string)
}
for _, v := range sl {
parts := strings.SplitN(v, "=", 2)
switch len(parts) {
case 2:
m[parts[0]] = parts[1]
case 1:
return fmt.Errorf("key '%s' does not have a value assigned", parts[0])
default:
return fmt.Errorf("empty string in slice")
}
}
return nil
}