woodpecker/cmd/agent/core/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.
package core
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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/atomic"
"time"
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"github.com/rs/zerolog/log"
"github.com/urfave/cli/v3"
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"golang.org/x/sync/errgroup"
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"google.golang.org/grpc"
"google.golang.org/grpc/codes"
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grpc_credentials "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"
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agent_rpc "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"
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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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)
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const (
reportHealthInterval = time.Second * 10
authInterceptorRefreshInterval = time.Minute * 30
)
const (
shutdownTimeout = time.Second * 5
)
var (
stopAgentFunc context.CancelCauseFunc = func(error) {}
shutdownCancelFunc context.CancelFunc = func() {}
shutdownCtx = context.Background()
)
func run(ctx context.Context, c *cli.Command, backends []types.Backend) error {
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agentCtx, ctxCancel := context.WithCancelCause(ctx)
stopAgentFunc = func(err error) {
msg := "shutdown of whole agent"
if err != nil {
log.Error().Err(err).Msg(msg)
} else {
log.Info().Msg(msg)
}
stopAgentFunc = func(error) {}
shutdownCtx, shutdownCancelFunc = context.WithTimeout(shutdownCtx, shutdownTimeout)
ctxCancel(err)
}
defer stopAgentFunc(nil)
defer shutdownCancelFunc()
serviceWaitingGroup := errgroup.Group{}
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agentConfigPath := c.String("agent-config")
hostname := c.String("hostname")
if len(hostname) == 0 {
hostname, _ = os.Hostname()
}
counter.Polling = int(c.Int("max-workflows"))
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counter.Running = 0
if c.Bool("healthcheck") {
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serviceWaitingGroup.Go(
func() error {
server := &http.Server{Addr: c.String("healthcheck-addr")}
go func() {
<-agentCtx.Done()
log.Info().Msg("shutdown healthcheck server ...")
if err := server.Shutdown(shutdownCtx); err != nil { //nolint:contextcheck
log.Error().Err(err).Msg("shutdown healthcheck server failed")
} else {
log.Info().Msg("healthcheck server stopped")
}
}()
if err := server.ListenAndServe(); err != nil {
log.Error().Err(err).Msgf("cannot listen on address %s", c.String("healthcheck-addr"))
}
return nil
})
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}
var transport grpc.DialOption
if c.Bool("grpc-secure") {
log.Trace().Msg("use ssl for grpc")
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transport = grpc.WithTransportCredentials(grpc_credentials.NewTLS(&tls.Config{InsecureSkipVerify: c.Bool("grpc-skip-insecure")}))
} else {
transport = grpc.WithTransportCredentials(insecure.NewCredentials())
}
authConn, err := grpc.NewClient(
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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 fmt.Errorf("could not create new gRPC 'channel' for authentication: %w", err)
}
defer authConn.Close()
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agentConfig := readAgentConfig(agentConfigPath)
agentToken := c.String("grpc-token")
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grpcClientCtx, grpcClientCtxCancel := context.WithCancelCause(context.Background())
defer grpcClientCtxCancel(nil)
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authClient := agent_rpc.NewAuthGrpcClient(authConn, agentToken, agentConfig.AgentID)
authInterceptor, err := agent_rpc.NewAuthInterceptor(grpcClientCtx, authClient, authInterceptorRefreshInterval) //nolint:contextcheck
if err != nil {
return fmt.Errorf("could not create new auth interceptor: %w", err)
}
conn, err := grpc.NewClient(
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 fmt.Errorf("could not create new gRPC 'channel' for normal orchestration: %w", err)
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}
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defer conn.Close()
client := agent_rpc.NewGrpcClient(ctx, conn)
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agentConfigPersisted := atomic.Bool{}
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grpcCtx := metadata.NewOutgoingContext(grpcClientCtx, metadata.Pairs("hostname", hostname))
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// check if grpc server version is compatible with agent
grpcServerVersion, err := client.Version(grpcCtx) //nolint:contextcheck
if err != nil {
log.Error().Err(err).Msg("could not get grpc server version")
return err
}
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if grpcServerVersion.GrpcVersion != agent_rpc.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,
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agent_rpc.ClientGrpcVersion)
return err
}
// new engine
backendCtx := context.WithValue(agentCtx, types.CliCommand, c)
backendName := c.String("backend-engine")
backendEngine, err := backend.FindBackend(backendCtx, backends, backendName)
if err != nil {
log.Error().Err(err).Msgf("cannot find backend engine '%s'", backendName)
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())
maxWorkflows := int(c.Int("max-workflows"))
agentConfig.AgentID, err = client.RegisterAgent(grpcCtx, engInfo.Platform, backendEngine.Name(), version.String(), maxWorkflows) //nolint:contextcheck
if err != nil {
return err
}
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serviceWaitingGroup.Go(func() error {
// we close grpc client context once unregister was handled
defer grpcClientCtxCancel(nil)
// we wait till agent context is done
<-agentCtx.Done()
// Remove stateless agents from server
if !agentConfigPersisted.Load() {
log.Debug().Msg("unregistering agent from server ...")
// we want to run it explicit run when context got canceled so run it in background
err := client.UnregisterAgent(grpcClientCtx)
if err != nil {
log.Err(err).Msg("failed to unregister agent from server")
} else {
log.Info().Msg("agent unregistered from server")
}
}
return nil
})
if agentConfigPath != "" {
if err := writeAgentConfig(agentConfig, agentConfigPath); err == nil {
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agentConfigPersisted.Store(true)
}
}
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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
}
log.Debug().Any("labels", labels).Msgf("agent configured with labels")
filter := rpc.Filter{
Labels: labels,
}
log.Debug().Msgf("agent registered with ID %d", agentConfig.AgentID)
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serviceWaitingGroup.Go(func() error {
for {
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err := client.ReportHealth(grpcCtx)
if err != nil {
log.Err(err).Msg("failed to report health")
}
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select {
case <-agentCtx.Done():
log.Debug().Msg("terminating health reporting")
return nil
case <-time.After(reportHealthInterval):
}
}
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})
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for i := 0; i < maxWorkflows; i++ {
i := i
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serviceWaitingGroup.Go(func() error {
runner := agent.NewRunner(client, filter, hostname, counter, &backendEngine)
log.Debug().Msgf("created new runner %d", i)
for {
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if agentCtx.Err() != nil {
return nil
}
log.Debug().Msg("polling new steps")
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if err := runner.Run(agentCtx, shutdownCtx); err != nil {
log.Error().Err(err).Msg("runner done with error")
return err
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}
}
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})
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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",
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version.String(), backendEngine.Name(), engInfo.Platform, maxWorkflows)
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return serviceWaitingGroup.Wait()
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}
func runWithRetry(backendEngines []types.Backend) func(ctx context.Context, c *cli.Command) error {
return func(ctx context.Context, c *cli.Command) error {
if err := logger.SetupGlobalLogger(ctx, c, true); err != nil {
return err
}
initHealth()
retryCount := int(c.Int("connect-retry-count"))
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retryDelay := c.Duration("connect-retry-delay")
var err error
for i := 0; i < retryCount; i++ {
if err = run(ctx, c, backendEngines); 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 utils.StringSliceDeleteEmpty(sl) {
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before, after, _ := strings.Cut(v, "=")
switch {
case before != "" && after != "":
m[before] = after
case before != "":
return fmt.Errorf("key '%s' does not have a value assigned", before)
default:
return fmt.Errorf("empty string in slice")
}
}
return nil
}