|
| 1 | +package agent |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "fmt" |
| 6 | + "io" |
| 7 | + "os" |
| 8 | + "os/exec" |
| 9 | + "path/filepath" |
| 10 | + "time" |
| 11 | + |
| 12 | + "github.com/firecracker-microvm/firecracker-go-sdk/vsock" |
| 13 | + "github.com/hostinger/fireactions/agent/runner" |
| 14 | + agentv1 "github.com/hostinger/fireactions/proto/agent/v1" |
| 15 | + "github.com/rs/zerolog" |
| 16 | + "github.com/sirupsen/logrus" |
| 17 | + "golang.org/x/sys/unix" |
| 18 | + "google.golang.org/grpc" |
| 19 | +) |
| 20 | + |
| 21 | +const ( |
| 22 | + logFilePath = "/var/log/fireactions-agent.log" |
| 23 | +) |
| 24 | + |
| 25 | +type Agent struct { |
| 26 | + agentv1.UnimplementedAgentServiceServer |
| 27 | + cfg Config |
| 28 | + logFile string |
| 29 | + logFileWriter *os.File |
| 30 | + logger *zerolog.Logger |
| 31 | + runner *runner.Runner |
| 32 | +} |
| 33 | + |
| 34 | +type Opt func(a *Agent) |
| 35 | + |
| 36 | +func New(cfg Config, opts ...Opt) (*Agent, error) { |
| 37 | + if cfgErr := cfg.Validate(); cfgErr != nil { |
| 38 | + return nil, fmt.Errorf("validate config: %w", cfgErr) |
| 39 | + } |
| 40 | + |
| 41 | + a := &Agent{ |
| 42 | + cfg: cfg, |
| 43 | + logFile: logFilePath, |
| 44 | + } |
| 45 | + |
| 46 | + for _, opt := range opts { |
| 47 | + opt(a) |
| 48 | + } |
| 49 | + |
| 50 | + if err := a.setupLogger(); err != nil { |
| 51 | + return nil, err |
| 52 | + } |
| 53 | + |
| 54 | + return a, nil |
| 55 | +} |
| 56 | + |
| 57 | +func (a *Agent) setupLogger() error { |
| 58 | + logDir := filepath.Dir(a.logFile) |
| 59 | + if err := os.MkdirAll(logDir, 0755); err != nil { |
| 60 | + return fmt.Errorf("create log directory: %w", err) |
| 61 | + } |
| 62 | + |
| 63 | + logFileWriter, err := os.OpenFile(a.logFile, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644) |
| 64 | + if err != nil { |
| 65 | + return fmt.Errorf("open log file: %w", err) |
| 66 | + } |
| 67 | + |
| 68 | + a.logFileWriter = logFileWriter |
| 69 | + |
| 70 | + logLevel, err := zerolog.ParseLevel(a.cfg.LogLevel) |
| 71 | + if err != nil { |
| 72 | + return fmt.Errorf("parse log level: %w", err) |
| 73 | + } |
| 74 | + |
| 75 | + multiWriter := io.MultiWriter(os.Stdout, logFileWriter) |
| 76 | + logger := zerolog.New(zerolog.ConsoleWriter{Out: multiWriter, TimeFormat: time.RFC3339}).With(). |
| 77 | + Timestamp(). |
| 78 | + Logger().Level(logLevel) |
| 79 | + |
| 80 | + a.logger = &logger |
| 81 | + return nil |
| 82 | +} |
| 83 | + |
| 84 | +// Close closes the agent resources, including the log file. |
| 85 | +func (a *Agent) Close() error { |
| 86 | + if a.logFileWriter != nil { |
| 87 | + return a.logFileWriter.Close() |
| 88 | + } |
| 89 | + |
| 90 | + return nil |
| 91 | +} |
| 92 | + |
| 93 | +func (a *Agent) Run(ctx context.Context) error { |
| 94 | + if err := a.setHostname(); err != nil { |
| 95 | + return fmt.Errorf("setting hostname: %w", err) |
| 96 | + } |
| 97 | + |
| 98 | + // Run GitHub runner in background - it will trigger shutdown on success |
| 99 | + go a.runGitHubRunner(ctx) |
| 100 | + |
| 101 | + // Run gRPC server in main flow |
| 102 | + return a.runGRPCServer(ctx) |
| 103 | +} |
| 104 | + |
| 105 | +func (a *Agent) runGRPCServer(ctx context.Context) error { |
| 106 | + logrusLogger := logrus.New() |
| 107 | + logrusLogger.SetLevel(logrus.InfoLevel) |
| 108 | + logrusEntry := logrus.NewEntry(logrusLogger) |
| 109 | + |
| 110 | + listener, err := vsock.Listener(ctx, logrusEntry, a.cfg.Port) |
| 111 | + if err != nil { |
| 112 | + return fmt.Errorf("vsock listen: %w", err) |
| 113 | + } |
| 114 | + defer listener.Close() |
| 115 | + |
| 116 | + grpcServer := grpc.NewServer() |
| 117 | + agentv1.RegisterAgentServiceServer(grpcServer, a) |
| 118 | + |
| 119 | + errCh := make(chan error, 1) |
| 120 | + go func() { |
| 121 | + a.logger.Info().Msgf("Agent GRPC server listening on VSOCK port %d", a.cfg.Port) |
| 122 | + if err := grpcServer.Serve(listener); err != nil { |
| 123 | + errCh <- fmt.Errorf("grpc serve: %w", err) |
| 124 | + } |
| 125 | + }() |
| 126 | + |
| 127 | + select { |
| 128 | + case <-ctx.Done(): |
| 129 | + grpcServer.GracefulStop() |
| 130 | + return nil |
| 131 | + case err := <-errCh: |
| 132 | + return err |
| 133 | + } |
| 134 | +} |
| 135 | + |
| 136 | +func (a *Agent) runGitHubRunner(ctx context.Context) { |
| 137 | + a.runner = runner.New( |
| 138 | + a.cfg.RunnerJITConfig, |
| 139 | + runner.WithLogger(a.logger), |
| 140 | + ) |
| 141 | + |
| 142 | + if err := a.runner.Run(ctx); err != nil { |
| 143 | + a.logger.Error().Err(err).Msg("Runner encountered an error") |
| 144 | + } |
| 145 | + |
| 146 | + if !a.cfg.ShutdownOnExit { |
| 147 | + a.logger.Info().Msg("Runner completed, but shutdown on exit is disabled - keeping VM running") |
| 148 | + return |
| 149 | + } |
| 150 | + |
| 151 | + a.logger.Info().Msg("Runner completed, initiating VM shutdown") |
| 152 | + a.shutdown() |
| 153 | +} |
| 154 | + |
| 155 | +func (a *Agent) shutdown() { |
| 156 | + ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second) |
| 157 | + defer cancel() |
| 158 | + |
| 159 | + cmd := exec.CommandContext(ctx, "systemctl", "reboot") |
| 160 | + if err := cmd.Run(); err != nil { |
| 161 | + a.logger.Error().Err(err).Msg("Failed to initiate VM shutdown") |
| 162 | + } |
| 163 | + |
| 164 | + a.logger.Info().Msg("Shutdown command executed") |
| 165 | +} |
| 166 | + |
| 167 | +func (a *Agent) setHostname() error { |
| 168 | + if err := unix.Sethostname([]byte(a.cfg.Hostname)); err != nil { |
| 169 | + return fmt.Errorf("sethostname: %w", err) |
| 170 | + } |
| 171 | + |
| 172 | + return nil |
| 173 | +} |
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