diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS index e3d9fbc9a183..f37f267c7bdd 100644 --- a/.github/CODEOWNERS +++ b/.github/CODEOWNERS @@ -22,6 +22,7 @@ cmd/configschema/ @open-telemetry/collector-contrib-approvers @mx-psi @dmitryax @pmcollins cmd/mdatagen/ @open-telemetry/collector-contrib-approvers @dmitryax +cmd/opampsupervisor/ @open-telemetry/collector-contrib-approvers @evan-bradley @atoulme @tigrannajaryan cmd/otelcontribcol/ @open-telemetry/collector-contrib-approvers cmd/oteltestbedcol/ @open-telemetry/collector-contrib-approvers cmd/telemetrygen/ @open-telemetry/collector-contrib-approvers @mx-psi @codeboten diff --git a/.github/ISSUE_TEMPLATE/bug_report.yaml b/.github/ISSUE_TEMPLATE/bug_report.yaml index 4107accc67e5..68316bc0df41 100644 --- a/.github/ISSUE_TEMPLATE/bug_report.yaml +++ b/.github/ISSUE_TEMPLATE/bug_report.yaml @@ -20,6 +20,7 @@ body: # Start Collector components list - cmd/configschema - cmd/mdatagen + - cmd/opampsupervisor - cmd/otelcontribcol - cmd/oteltestbedcol - cmd/telemetrygen diff --git a/.github/ISSUE_TEMPLATE/feature_request.yaml b/.github/ISSUE_TEMPLATE/feature_request.yaml index 9680ffa19da9..1c9d4773bc55 100644 --- a/.github/ISSUE_TEMPLATE/feature_request.yaml +++ b/.github/ISSUE_TEMPLATE/feature_request.yaml @@ -14,6 +14,7 @@ body: # Start Collector components list - cmd/configschema - cmd/mdatagen + - cmd/opampsupervisor - cmd/otelcontribcol - cmd/oteltestbedcol - cmd/telemetrygen diff --git a/.github/ISSUE_TEMPLATE/other.yaml b/.github/ISSUE_TEMPLATE/other.yaml index 1746a9f0c376..3c6069627cc0 100644 --- a/.github/ISSUE_TEMPLATE/other.yaml +++ b/.github/ISSUE_TEMPLATE/other.yaml @@ -14,6 +14,7 @@ body: # Start Collector components list - cmd/configschema - cmd/mdatagen + - cmd/opampsupervisor - cmd/otelcontribcol - cmd/oteltestbedcol - cmd/telemetrygen diff --git a/cmd/opampsupervisor/.gitignore b/cmd/opampsupervisor/.gitignore new file mode 100644 index 000000000000..fbaf96e91182 --- /dev/null +++ b/cmd/opampsupervisor/.gitignore @@ -0,0 +1,2 @@ +effective.yaml +agent.log diff --git a/cmd/opampsupervisor/Makefile b/cmd/opampsupervisor/Makefile new file mode 100644 index 000000000000..ded7a36092dc --- /dev/null +++ b/cmd/opampsupervisor/Makefile @@ -0,0 +1 @@ +include ../../Makefile.Common diff --git a/cmd/opampsupervisor/README.md b/cmd/opampsupervisor/README.md new file mode 100644 index 000000000000..2c8bdbafaece --- /dev/null +++ b/cmd/opampsupervisor/README.md @@ -0,0 +1,24 @@ +# OpAMP Supervisor for the OpenTelemetry Collector + +This is an implementation of an OpAMP Supervisor that runs a Collector instance using configuration provided from an OpAMP server. This implementation +is following a design specified in this [Google Doc](https://docs.google.com/document/d/1KtH5atZQUs9Achbce6LiOaJxLbksNJenvgvyKLsJrkc/edit). +The design is still undergoing changes, and as such this implementation may change as well. + +## Experimenting with the supervisor + +The supervisor is currently undergoing heavy development and is not ready for any serious use. However, if you would like to test it, you can follow the steps below: + +1. Download the [opamp-go](https://github.com/open-telemetry/opamp-go) repository, and run the OpAMP example server in the `internal/examples/server` directory. +2. From the Collector contrib repository root, build the Collector: + + ```shell + make otelcontribcol + ``` + +3. Run the supervisor, substituting `` for your platform: + + ```shell + go run . --config testdata/supervisor_.yaml + ``` + +4. The supervisor should connect to the OpAMP server and start a Collector instance. \ No newline at end of file diff --git a/cmd/opampsupervisor/go.mod b/cmd/opampsupervisor/go.mod new file mode 100644 index 000000000000..5f2043add89f --- /dev/null +++ b/cmd/opampsupervisor/go.mod @@ -0,0 +1,28 @@ +module github.com/open-telemetry/opentelemetry-collector-contrib/cmd/opampsupervisor + +go 1.19 + +require ( + github.com/cenkalti/backoff/v4 v4.2.0 + github.com/knadh/koanf v1.5.0 + github.com/oklog/ulid/v2 v2.1.0 + github.com/open-telemetry/opamp-go v0.6.0 + github.com/scaleway/scaleway-sdk-go v1.0.0-beta.13 + go.uber.org/atomic v1.7.0 + go.uber.org/zap v1.17.0 +) + +require ( + github.com/davecgh/go-spew v1.1.1 // indirect + github.com/fsnotify/fsnotify v1.6.0 // indirect + github.com/gorilla/websocket v1.5.0 // indirect + github.com/mitchellh/copystructure v1.2.0 // indirect + github.com/mitchellh/mapstructure v1.5.0 // indirect + github.com/mitchellh/reflectwalk v1.0.2 // indirect + github.com/pmezard/go-difflib v1.0.0 // indirect + github.com/stretchr/testify v1.8.2 // indirect + go.uber.org/multierr v1.6.0 // indirect + golang.org/x/sys v0.5.0 // indirect + google.golang.org/protobuf v1.28.1 // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect +) diff --git a/cmd/opampsupervisor/go.sum b/cmd/opampsupervisor/go.sum new file mode 100644 index 000000000000..a13b33da6055 --- /dev/null +++ b/cmd/opampsupervisor/go.sum @@ -0,0 +1,414 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc= +github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc= +github.com/alecthomas/units 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/dev/null +++ b/cmd/opampsupervisor/main.go @@ -0,0 +1,43 @@ +// Copyright The OpenTelemetry Authors +// +// 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 +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// 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 main + +import ( + "flag" + "os" + "os/signal" + + "github.com/open-telemetry/opentelemetry-collector-contrib/cmd/opampsupervisor/supervisor" + "go.uber.org/zap" +) + +func main() { + configFlag := flag.String("config", "", "Path to a supervisor configuration file") + flag.Parse() + + logger, _ := zap.NewDevelopment() + + supervisor, err := supervisor.NewSupervisor(logger, *configFlag) + if err != nil { + logger.Error(err.Error()) + os.Exit(-1) + return + } + + interrupt := make(chan os.Signal, 1) + signal.Notify(interrupt, os.Interrupt) + <-interrupt + supervisor.Shutdown() +} diff --git a/cmd/opampsupervisor/supervisor/commander/commander.go b/cmd/opampsupervisor/supervisor/commander/commander.go new file mode 100644 index 000000000000..a41768afbc5c --- /dev/null +++ b/cmd/opampsupervisor/supervisor/commander/commander.go @@ -0,0 +1,192 @@ +// Copyright The OpenTelemetry Authors +// +// 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 +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// 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 commander + +import ( + "context" + "errors" + "fmt" + "os" + "os/exec" + "syscall" + "time" + + "go.uber.org/atomic" + "go.uber.org/zap" + + "github.com/open-telemetry/opentelemetry-collector-contrib/cmd/opampsupervisor/supervisor/config" +) + +// Commander can start/stop/restart the Agent executable and also watch for a signal +// for the Agent process to finish. +type Commander struct { + logger *zap.Logger + cfg *config.Agent + args []string + cmd *exec.Cmd + doneCh chan struct{} + waitCh chan struct{} + running *atomic.Int64 +} + +func NewCommander(logger *zap.Logger, cfg *config.Agent, args ...string) (*Commander, error) { + if cfg.Executable == "" { + return nil, errors.New("agent.executable config option must be specified") + } + + return &Commander{ + logger: logger, + cfg: cfg, + args: args, + running: atomic.NewInt64(0), + }, nil +} + +// Start the Agent and begin watching the process. +// Agent's stdout and stderr are written to a file. +func (c *Commander) Start(ctx context.Context) error { + c.logger.Debug("Starting agent", zap.String("agent", c.cfg.Executable)) + + logFilePath := "agent.log" + logFile, err := os.Create(logFilePath) + if err != nil { + return fmt.Errorf("cannot create %s: %w", logFilePath, err) + } + + c.cmd = exec.CommandContext(ctx, c.cfg.Executable, c.args...) // #nosec G204 + + // Capture standard output and standard error. + c.cmd.Stdout = logFile + c.cmd.Stderr = logFile + + c.doneCh = make(chan struct{}, 1) + c.waitCh = make(chan struct{}) + + if err := c.cmd.Start(); err != nil { + return err + } + + c.logger.Debug("Agent process started", zap.Int("pid", c.cmd.Process.Pid)) + c.running.Store(1) + + go c.watch() + + return nil +} + +func (c *Commander) Restart(ctx context.Context) error { + if err := c.Stop(ctx); err != nil { + return err + } + if err := c.Start(ctx); err != nil { + return err + } + return nil +} + +func (c *Commander) watch() { + err := c.cmd.Wait() + + // cmd.Wait returns an exec.ExitError when the Collector exits unsuccessfully or stops + // after receiving a signal. The Commander caller will handle these cases, so we filter + // them out here. + if _, ok := err.(*exec.ExitError); err != nil && !ok { + c.logger.Error("An error occurred while watching the agent process", zap.Error(err)) + } + + c.doneCh <- struct{}{} + c.running.Store(0) + close(c.waitCh) +} + +// Done returns a channel that will send a signal when the Agent process is finished. +func (c *Commander) Done() <-chan struct{} { + return c.doneCh +} + +// Pid returns Agent process PID if it is started or 0 if it is not. +func (c *Commander) Pid() int { + if c.cmd == nil || c.cmd.Process == nil { + return 0 + } + return c.cmd.Process.Pid +} + +// ExitCode returns Agent process exit code if it exited or 0 if it is not. +func (c *Commander) ExitCode() int { + if c.cmd == nil || c.cmd.ProcessState == nil { + return 0 + } + return c.cmd.ProcessState.ExitCode() +} + +func (c *Commander) IsRunning() bool { + return c.running.Load() != 0 +} + +// Stop the Agent process. Sends SIGTERM to the process and wait for up 10 seconds +// and if the process does not finish kills it forcedly by sending SIGKILL. +// Returns after the process is terminated. +func (c *Commander) Stop(ctx context.Context) error { + if c.cmd == nil || c.cmd.Process == nil { + // Not started, nothing to do. + return nil + } + + c.logger.Debug("Stopping agent process", zap.Int("pid", c.cmd.Process.Pid)) + + // Gracefully signal process to stop. + if err := c.cmd.Process.Signal(syscall.SIGTERM); err != nil { + return err + } + + finished := make(chan struct{}) + + // Setup a goroutine to wait a while for process to finish and send kill signal + // to the process if it doesn't finish. + var innerErr error + go func() { + // Wait 10 seconds. + t := time.After(10 * time.Second) + select { + case <-ctx.Done(): + break + case <-t: + break + case <-finished: + // Process is successfully finished. + c.logger.Debug("Agent process successfully stopped.", zap.Int("pid", c.cmd.Process.Pid)) + return + } + + // Time is out. Kill the process. + c.logger.Debug( + "Agent process is not responding to SIGTERM. Sending SIGKILL to kill forcedly.", + zap.Int("pid", c.cmd.Process.Pid)) + if innerErr = c.cmd.Process.Signal(syscall.SIGKILL); innerErr != nil { + return + } + }() + + // Wait for process to terminate + <-c.waitCh + + c.running.Store(0) + + // Let goroutine know process is finished. + close(finished) + + return innerErr +} diff --git a/cmd/opampsupervisor/supervisor/config/config.go b/cmd/opampsupervisor/supervisor/config/config.go new file mode 100644 index 000000000000..dd3ad391375d --- /dev/null +++ b/cmd/opampsupervisor/supervisor/config/config.go @@ -0,0 +1,29 @@ +// Copyright The OpenTelemetry Authors +// +// 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 +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// 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 config + +// Supervisor is the Supervisor config file format. +type Supervisor struct { + Server *OpAMPServer + Agent *Agent +} + +type OpAMPServer struct { + Endpoint string +} + +type Agent struct { + Executable string +} diff --git a/cmd/opampsupervisor/supervisor/healthchecker/healthchecker.go b/cmd/opampsupervisor/supervisor/healthchecker/healthchecker.go new file mode 100644 index 000000000000..3e50baf3b2ef --- /dev/null +++ b/cmd/opampsupervisor/supervisor/healthchecker/healthchecker.go @@ -0,0 +1,54 @@ +// Copyright The OpenTelemetry Authors +// +// 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 +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// 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 healthchecker + +import ( + "context" + "fmt" + "net/http" + "time" +) + +type HTTPHealthChecker struct { + endpoint string +} + +func NewHTTPHealthChecker(endpoint string) *HTTPHealthChecker { + return &HTTPHealthChecker{ + endpoint: endpoint, + } +} + +func (h *HTTPHealthChecker) Check(ctx context.Context) error { + req, err := http.NewRequestWithContext(ctx, "GET", h.endpoint, nil) + if err != nil { + return err + } + + client := http.Client{ + Timeout: time.Second * 10, + } + + resp, err := client.Do(req) + if err != nil { + return err + } + + if resp.StatusCode != http.StatusOK { + return fmt.Errorf("health check on %s returned %d", h.endpoint, resp.StatusCode) + } + + return nil +} diff --git a/cmd/opampsupervisor/supervisor/opamplogger.go b/cmd/opampsupervisor/supervisor/opamplogger.go new file mode 100644 index 000000000000..00f8c1c9fd63 --- /dev/null +++ b/cmd/opampsupervisor/supervisor/opamplogger.go @@ -0,0 +1,38 @@ +// Copyright The OpenTelemetry Authors +// +// 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 +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// 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 supervisor + +import ( + "fmt" + + "github.com/open-telemetry/opamp-go/client/types" + "go.uber.org/zap" +) + +// opAMPLogger adapts the Supervisor's zap.Logger instance so it +// can be used by the OpAMP client. +type opAMPLogger struct { + logger *zap.Logger +} + +func (l opAMPLogger) Debugf(format string, v ...interface{}) { + l.logger.Debug(fmt.Sprintf(format, v...)) +} + +func (l opAMPLogger) Errorf(format string, v ...interface{}) { + l.logger.Error(fmt.Sprintf(format, v...)) +} + +var _ types.Logger = opAMPLogger{} diff --git a/cmd/opampsupervisor/supervisor/supervisor.go b/cmd/opampsupervisor/supervisor/supervisor.go new file mode 100644 index 000000000000..050ebaf3dc49 --- /dev/null +++ b/cmd/opampsupervisor/supervisor/supervisor.go @@ -0,0 +1,695 @@ +// Copyright The OpenTelemetry Authors +// +// 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 +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// 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 supervisor + +import ( + "context" + "errors" + "fmt" + "math/rand" + "net" + "os" + "runtime" + "sort" + "time" + + "github.com/cenkalti/backoff/v4" + "github.com/knadh/koanf" + "github.com/knadh/koanf/parsers/yaml" + "github.com/knadh/koanf/providers/file" + "github.com/knadh/koanf/providers/rawbytes" + "github.com/oklog/ulid/v2" + "github.com/open-telemetry/opamp-go/client" + "github.com/open-telemetry/opamp-go/client/types" + "github.com/open-telemetry/opamp-go/protobufs" + "go.uber.org/atomic" + "go.uber.org/zap" + + "github.com/open-telemetry/opentelemetry-collector-contrib/cmd/opampsupervisor/supervisor/commander" + "github.com/open-telemetry/opentelemetry-collector-contrib/cmd/opampsupervisor/supervisor/config" + "github.com/open-telemetry/opentelemetry-collector-contrib/cmd/opampsupervisor/supervisor/healthchecker" +) + +// This Supervisor is developed specifically for the OpenTelemetry Collector. +const agentType = "io.opentelemetry.collector" + +// Supervisor implements supervising of OpenTelemetry Collector and uses OpAMPClient +// to work with an OpAMP Server. +type Supervisor struct { + logger *zap.Logger + + // Commander that starts/stops the Agent process. + commander *commander.Commander + + startedAt time.Time + + healthCheckTicker *backoff.Ticker + healthChecker *healthchecker.HTTPHealthChecker + lastHealthCheckErr error + + // Supervisor's own config. + config config.Supervisor + + // Agent's instance id. + instanceID ulid.ULID + + // The version of the agent. + agentVersion string + + // A config section to be added to the Collector's config to fetch its own metrics. + // TODO: store this persistently so that when starting we can compose the effective + // config correctly. + agentConfigOwnMetricsSection atomic.Value + + // agentHealthCheckEndpoint is the endpoint the Collector's health check extension + // will listen on for health check requests from the Supervisor. + agentHealthCheckEndpoint string + + // Final effective config of the Collector. + effectiveConfig atomic.Value + + // Location of the effective config file. + effectiveConfigFilePath string + + // Last received remote config. + remoteConfig *protobufs.AgentRemoteConfig + + // A channel to indicate there is a new config to apply. + hasNewConfig chan struct{} + + // The OpAMP client to connect to the OpAMP Server. + opampClient client.OpAMPClient +} + +func NewSupervisor(logger *zap.Logger, configFile string) (*Supervisor, error) { + s := &Supervisor{ + logger: logger, + hasNewConfig: make(chan struct{}, 1), + effectiveConfigFilePath: "effective.yaml", + } + + if err := s.loadConfig(configFile); err != nil { + return nil, fmt.Errorf("error loading config: %w", err) + } + + if err := s.getBootstrapInfo(); err != nil { + s.logger.Error("Couldn't get agent version", zap.Error(err)) + } + + port, err := s.findRandomPort() + + if err != nil { + return nil, fmt.Errorf("could not find port for health check: %w", err) + } + + s.agentHealthCheckEndpoint = fmt.Sprintf("localhost:%d", port) + + s.createInstanceID() + logger.Debug("Supervisor starting", + zap.String("id", s.instanceID.String()), zap.String("type", agentType), zap.String("version", s.agentVersion)) + + s.loadAgentEffectiveConfig() + + if err := s.startOpAMP(); err != nil { + return nil, fmt.Errorf("cannot start OpAMP client: %w", err) + } + + s.commander, err = commander.NewCommander( + s.logger, + s.config.Agent, + "--config", s.effectiveConfigFilePath, + ) + if err != nil { + return nil, err + } + + s.startHealthCheckTicker() + go s.runAgentProcess() + + return s, nil +} + +func (s *Supervisor) loadConfig(configFile string) error { + if configFile == "" { + return errors.New("path to config file cannot be empty") + } + + k := koanf.New("::") + if err := k.Load(file.Provider(configFile), yaml.Parser()); err != nil { + return err + } + + if err := k.Unmarshal("", &s.config); err != nil { + return fmt.Errorf("cannot parse %v: %w", configFile, err) + } + + return nil +} + +func (s *Supervisor) getBootstrapInfo() (err error) { + s.agentVersion = "1.0.0" + + return nil +} + +func (s *Supervisor) startOpAMP() error { + s.opampClient = client.NewWebSocket(opAMPLogger{logger: s.logger}) + + settings := types.StartSettings{ + OpAMPServerURL: s.config.Server.Endpoint, + InstanceUid: s.instanceID.String(), + Callbacks: types.CallbacksStruct{ + OnConnectFunc: func() { + s.logger.Debug("Connected to the server.") + }, + OnConnectFailedFunc: func(err error) { + s.logger.Error("Failed to connect to the server", zap.Error(err)) + }, + OnErrorFunc: func(err *protobufs.ServerErrorResponse) { + s.logger.Error("Server returned an error response", zap.String("message", err.ErrorMessage)) + }, + GetEffectiveConfigFunc: func(ctx context.Context) (*protobufs.EffectiveConfig, error) { + return s.createEffectiveConfigMsg(), nil + }, + OnMessageFunc: s.onMessage, + }, + // TODO: Make capabilities configurable + Capabilities: protobufs.AgentCapabilities_AgentCapabilities_AcceptsRemoteConfig | + protobufs.AgentCapabilities_AgentCapabilities_ReportsRemoteConfig | + protobufs.AgentCapabilities_AgentCapabilities_ReportsEffectiveConfig | + protobufs.AgentCapabilities_AgentCapabilities_ReportsOwnMetrics | + protobufs.AgentCapabilities_AgentCapabilities_ReportsHealth, + } + err := s.opampClient.SetAgentDescription(s.createAgentDescription()) + if err != nil { + return err + } + + err = s.opampClient.SetHealth(&protobufs.AgentHealth{Healthy: false}) + if err != nil { + return err + } + + s.logger.Debug("Starting OpAMP client...") + + err = s.opampClient.Start(context.Background(), settings) + if err != nil { + return err + } + + s.logger.Debug("OpAMP Client started.") + + return nil +} + +func (s *Supervisor) createInstanceID() { + // Generate instance id. + entropy := ulid.Monotonic(rand.New(rand.NewSource(0)), 0) + s.instanceID = ulid.MustNew(ulid.Timestamp(time.Now()), entropy) + + // TODO: Persist instance ID. +} + +func keyVal(key, val string) *protobufs.KeyValue { + return &protobufs.KeyValue{ + Key: key, + Value: &protobufs.AnyValue{ + Value: &protobufs.AnyValue_StringValue{StringValue: val}, + }, + } +} + +func (s *Supervisor) createAgentDescription() *protobufs.AgentDescription { + hostname, _ := os.Hostname() + + // Create Agent description. + return &protobufs.AgentDescription{ + IdentifyingAttributes: []*protobufs.KeyValue{ + keyVal("service.name", agentType), + keyVal("service.version", s.agentVersion), + }, + NonIdentifyingAttributes: []*protobufs.KeyValue{ + keyVal("os.family", runtime.GOOS), + keyVal("host.name", hostname), + }, + } +} + +func (s *Supervisor) composeExtraLocalConfig() string { + return fmt.Sprintf(` +service: + telemetry: + logs: + # Enables JSON log output for the Agent. + encoding: json + resource: + # Set resource attributes required by OpAMP spec. + # See https://github.com/open-telemetry/opamp-spec/blob/main/specification.md#agentdescriptionidentifying_attributes + service.name: %s + service.version: %s + service.instance.id: %s + + # Enable extension to allow the Supervisor to check health. + extensions: [health_check] + +extensions: + health_check: + endpoint: %s +`, + agentType, + s.agentVersion, + s.instanceID.String(), + s.agentHealthCheckEndpoint, + ) +} + +func (s *Supervisor) loadAgentEffectiveConfig() { + var effectiveConfigBytes []byte + + effFromFile, err := os.ReadFile(s.effectiveConfigFilePath) + if err == nil { + // We have an effective config file. + effectiveConfigBytes = effFromFile + } else { + // No effective config file, just use the initial config. + effectiveConfigBytes = []byte(s.composeExtraLocalConfig()) + } + + s.effectiveConfig.Store(string(effectiveConfigBytes)) +} + +// createEffectiveConfigMsg create an EffectiveConfig with the content of the +// current effective config. +func (s *Supervisor) createEffectiveConfigMsg() *protobufs.EffectiveConfig { + cfgStr, ok := s.effectiveConfig.Load().(string) + if !ok { + cfgStr = "" + } + + cfg := &protobufs.EffectiveConfig{ + ConfigMap: &protobufs.AgentConfigMap{ + ConfigMap: map[string]*protobufs.AgentConfigFile{ + "": {Body: []byte(cfgStr)}, + }, + }, + } + + return cfg +} + +func (s *Supervisor) setupOwnMetrics(_ context.Context, settings *protobufs.TelemetryConnectionSettings) (configChanged bool) { + var cfg string + if settings.DestinationEndpoint == "" { + // No destination. Disable metric collection. + s.logger.Debug("Disabling own metrics pipeline in the config") + cfg = "" + } else { + s.logger.Debug("Enabling own metrics pipeline in the config") + + port, err := s.findRandomPort() + + if err != nil { + s.logger.Error("Could not setup own metrics", zap.Error(err)) + return + } + + cfg = fmt.Sprintf( + ` +receivers: + # Collect own metrics + prometheus/own_metrics: + config: + scrape_configs: + - job_name: 'otel-collector' + scrape_interval: 10s + static_configs: + - targets: ['0.0.0.0:%d'] +exporters: + otlphttp/own_metrics: + metrics_endpoint: %s + +service: + telemetry: + metrics: + address: :%d + pipelines: + metrics/own_metrics: + receivers: [prometheus/own_metrics] + exporters: [otlphttp/own_metrics] +`, + port, + settings.DestinationEndpoint, + port, + ) + } + + s.agentConfigOwnMetricsSection.Store(cfg) + + // Need to recalculate the Agent config so that the metric config is included in it. + configChanged, err := s.recalcEffectiveConfig() + if err != nil { + return + } + + return configChanged +} + +// composeEffectiveConfig composes the effective config from multiple sources: +// 1) the remote config from OpAMP Server +// 2) the own metrics config section +// 3) the local override config that is hard-coded in the Supervisor. +func (s *Supervisor) composeEffectiveConfig(config *protobufs.AgentRemoteConfig) (configChanged bool, err error) { + var k = koanf.New(".") + + // Begin with empty config. We will merge received configs on top of it. + if err = k.Load(rawbytes.Provider([]byte{}), yaml.Parser()); err != nil { + return false, err + } + + // Sort to make sure the order of merging is stable. + var names []string + for name := range config.Config.ConfigMap { + if name == "" { + // skip instance config + continue + } + names = append(names, name) + } + + sort.Strings(names) + + // Append instance config as the last item. + names = append(names, "") + + // Merge received configs. + for _, name := range names { + item := config.Config.ConfigMap[name] + var k2 = koanf.New(".") + err = k2.Load(rawbytes.Provider(item.Body), yaml.Parser()) + if err != nil { + return false, fmt.Errorf("cannot parse config named %s: %w", name, err) + } + err = k.Merge(k2) + if err != nil { + return false, fmt.Errorf("cannot merge config named %s: %w", name, err) + } + } + + // Merge own metrics config. + ownMetricsCfg, ok := s.agentConfigOwnMetricsSection.Load().(string) + if ok { + if err = k.Load(rawbytes.Provider([]byte(ownMetricsCfg)), yaml.Parser()); err != nil { + return false, err + } + } + + // Merge local config last since it has the highest precedence. + if err = k.Load(rawbytes.Provider([]byte(s.composeExtraLocalConfig())), yaml.Parser()); err != nil { + return false, err + } + + // The merged final result is our effective config. + effectiveConfigBytes, err := k.Marshal(yaml.Parser()) + if err != nil { + return false, err + } + + // Check if effective config is changed. + newEffectiveConfig := string(effectiveConfigBytes) + configChanged = false + if s.effectiveConfig.Load().(string) != newEffectiveConfig { + s.logger.Debug("Effective config changed.") + s.effectiveConfig.Store(newEffectiveConfig) + configChanged = true + } + + return configChanged, nil +} + +// Recalculate the Agent's effective config and if the config changes, signal to the +// background goroutine that the config needs to be applied to the Agent. +func (s *Supervisor) recalcEffectiveConfig() (configChanged bool, err error) { + configChanged, err = s.composeEffectiveConfig(s.remoteConfig) + if err != nil { + s.logger.Error("Error composing effective config. Ignoring received config", zap.Error(err)) + return configChanged, err + } + + return configChanged, nil +} + +func (s *Supervisor) startAgent() { + err := s.commander.Start(context.Background()) + if err != nil { + s.logger.Error("Cannot start the agent", zap.Error(err)) + err := s.opampClient.SetHealth(&protobufs.AgentHealth{Healthy: false, LastError: fmt.Sprintf("Cannot start the agent: %v", err)}) + + if err != nil { + s.logger.Error("Failed to report OpAMP client health", zap.Error(err)) + } + + return + } + s.startedAt = time.Now() + s.startHealthCheckTicker() + + s.healthChecker = healthchecker.NewHTTPHealthChecker(fmt.Sprintf("http://%s", s.agentHealthCheckEndpoint)) +} + +func (s *Supervisor) startHealthCheckTicker() { + // Prepare health checker + healthCheckBackoff := backoff.NewExponentialBackOff() + healthCheckBackoff.MaxInterval = 60 * time.Second + healthCheckBackoff.MaxElapsedTime = 0 // Never stop + if s.healthCheckTicker != nil { + s.healthCheckTicker.Stop() + } + s.healthCheckTicker = backoff.NewTicker(healthCheckBackoff) +} + +func (s *Supervisor) healthCheck() { + if !s.commander.IsRunning() { + return + } + + ctx, cancel := context.WithTimeout(context.Background(), time.Second*10) + + err := s.healthChecker.Check(ctx) + cancel() + + if errors.Is(err, s.lastHealthCheckErr) { + // No difference from last check. Nothing new to report. + return + } + + // Prepare OpAMP health report. + health := &protobufs.AgentHealth{ + StartTimeUnixNano: uint64(s.startedAt.UnixNano()), + } + + if err != nil { + health.Healthy = false + health.LastError = err.Error() + s.logger.Error("Agent is not healthy", zap.Error(err)) + } else { + health.Healthy = true + s.logger.Debug("Agent is healthy.") + } + + // Report via OpAMP. + if err2 := s.opampClient.SetHealth(health); err2 != nil { + s.logger.Error("Could not report health to OpAMP server", zap.Error(err2)) + return + } + + s.lastHealthCheckErr = err +} + +func (s *Supervisor) runAgentProcess() { + if _, err := os.Stat(s.effectiveConfigFilePath); err == nil { + // We have an effective config file saved previously. Use it to start the agent. + s.startAgent() + } + + restartTimer := time.NewTimer(0) + restartTimer.Stop() + + for { + select { + case <-s.hasNewConfig: + restartTimer.Stop() + s.stopAgentApplyConfig() + s.startAgent() + + case <-s.commander.Done(): + s.logger.Debug("Agent process exited unexpectedly. Will restart in a bit...", zap.Int("pid", s.commander.Pid()), zap.Int("exit_code", s.commander.ExitCode())) + errMsg := fmt.Sprintf( + "Agent process PID=%d exited unexpectedly, exit code=%d. Will restart in a bit...", + s.commander.Pid(), s.commander.ExitCode(), + ) + err := s.opampClient.SetHealth(&protobufs.AgentHealth{Healthy: false, LastError: errMsg}) + + if err != nil { + s.logger.Error("Could not report health to OpAMP server", zap.Error(err)) + } + + // TODO: decide why the agent stopped. If it was due to bad config, report it to server. + + // Wait 5 seconds before starting again. + restartTimer.Stop() + restartTimer.Reset(5 * time.Second) + + case <-restartTimer.C: + s.startAgent() + + case <-s.healthCheckTicker.C: + s.healthCheck() + } + } +} + +func (s *Supervisor) stopAgentApplyConfig() { + s.logger.Debug("Stopping the agent to apply new config") + cfg := s.effectiveConfig.Load().(string) + err := s.commander.Stop(context.Background()) + + if err != nil { + s.logger.Error("Could not stop agent process", zap.Error(err)) + } + + s.writeEffectiveConfigToFile(cfg, s.effectiveConfigFilePath) +} + +func (s *Supervisor) writeEffectiveConfigToFile(cfg string, filePath string) { + f, err := os.Create(filePath) + if err != nil { + s.logger.Error("Cannot create effective config file", zap.Error(err)) + } + defer f.Close() + + _, err = f.WriteString(cfg) + + if err != nil { + s.logger.Error("Cannot write effective config file", zap.Error(err)) + } +} + +func (s *Supervisor) Shutdown() { + s.logger.Debug("Supervisor shutting down...") + if s.commander != nil { + err := s.commander.Stop(context.Background()) + + if err != nil { + s.logger.Error("Could not stop agent process", zap.Error(err)) + } + } + if s.opampClient != nil { + err := s.opampClient.SetHealth( + &protobufs.AgentHealth{ + Healthy: false, LastError: "Supervisor is shutdown", + }, + ) + + if err != nil { + s.logger.Error("Could not report health to OpAMP server", zap.Error(err)) + } + + err = s.opampClient.Stop(context.Background()) + + if err != nil { + s.logger.Error("Could not stop the OpAMP client", zap.Error(err)) + } + } +} + +func (s *Supervisor) onMessage(ctx context.Context, msg *types.MessageData) { + configChanged := false + if msg.RemoteConfig != nil { + s.remoteConfig = msg.RemoteConfig + s.logger.Debug("Received remote config from server", zap.String("hash", fmt.Sprintf("%x", s.remoteConfig.ConfigHash))) + + var err error + configChanged, err = s.recalcEffectiveConfig() + if err != nil { + err = s.opampClient.SetRemoteConfigStatus(&protobufs.RemoteConfigStatus{ + LastRemoteConfigHash: msg.RemoteConfig.ConfigHash, + Status: protobufs.RemoteConfigStatuses_RemoteConfigStatuses_FAILED, + ErrorMessage: err.Error(), + }) + if err != nil { + s.logger.Error("Could not report failed OpAMP remote config status", zap.Error(err)) + } + } else { + err = s.opampClient.SetRemoteConfigStatus(&protobufs.RemoteConfigStatus{ + LastRemoteConfigHash: msg.RemoteConfig.ConfigHash, + Status: protobufs.RemoteConfigStatuses_RemoteConfigStatuses_APPLIED, + }) + if err != nil { + s.logger.Error("Could not report applied OpAMP remote config status", zap.Error(err)) + } + } + } + + if msg.OwnMetricsConnSettings != nil { + configChanged = s.setupOwnMetrics(ctx, msg.OwnMetricsConnSettings) || configChanged + } + + if msg.AgentIdentification != nil { + newInstanceID, err := ulid.Parse(msg.AgentIdentification.NewInstanceUid) + if err != nil { + s.logger.Error("Failed to parse instance ULID", zap.Error(err)) + } + + s.logger.Debug("Agent identity is changing", + zap.String("old_id", s.instanceID.String()), + zap.String("new_id", newInstanceID.String())) + s.instanceID = newInstanceID + s.opampClient.SetAgentDescription(s.createAgentDescription()) + + configChanged = true + } + + if configChanged { + err := s.opampClient.UpdateEffectiveConfig(ctx) + if err != nil { + s.logger.Error("The OpAMP client failed to update the effective config", zap.Error(err)) + } + + s.logger.Debug("Config is changed. Signal to restart the agent") + // Signal that there is a new config. + select { + case s.hasNewConfig <- struct{}{}: + default: + } + } +} + +func (s *Supervisor) findRandomPort() (int, error) { + l, err := net.Listen("tcp", ":0") + + if err != nil { + return 0, err + } + + port := l.Addr().(*net.TCPAddr).Port + + err = l.Close() + + if err != nil { + return 0, err + } + + return port, nil +} diff --git a/cmd/opampsupervisor/testdata/supervisor_darwin.yaml b/cmd/opampsupervisor/testdata/supervisor_darwin.yaml new file mode 100644 index 000000000000..9b278fedbcd8 --- /dev/null +++ b/cmd/opampsupervisor/testdata/supervisor_darwin.yaml @@ -0,0 +1,5 @@ +server: + endpoint: ws://127.0.0.1:4320/v1/opamp + +agent: + executable: ../../bin/otelcontribcol_darwin_amd64 diff --git a/cmd/opampsupervisor/testdata/supervisor_linux.yaml b/cmd/opampsupervisor/testdata/supervisor_linux.yaml new file mode 100644 index 000000000000..9cb491ff2436 --- /dev/null +++ b/cmd/opampsupervisor/testdata/supervisor_linux.yaml @@ -0,0 +1,5 @@ +server: + endpoint: ws://127.0.0.1:4320/v1/opamp + +agent: + executable: ../../bin/otelcontribcol_linux_amd64 diff --git a/cmd/opampsupervisor/testdata/supervisor_windows.yaml b/cmd/opampsupervisor/testdata/supervisor_windows.yaml new file mode 100644 index 000000000000..0aefc0c2b727 --- /dev/null +++ b/cmd/opampsupervisor/testdata/supervisor_windows.yaml @@ -0,0 +1,5 @@ +server: + endpoint: ws://127.0.0.1:4320/v1/opamp + +agent: + executable: ../../bin/otelcontribcol_windows_amd64.exe