create logger & load cfg in main, fix ci, add chglog

.chloggen/configurable-supervisor-logging.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: opampsupervisor
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add configurable logging for the supervisor.
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [35466]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: []

cmd/opampsupervisor/e2e_test.go

@@ -154,7 +154,9 @@ func newUnstartedOpAMPServer(t *testing.T, connectingCallback onConnectingFuncFa
 
 func newSupervisor(t *testing.T, configType string, extraConfigData map[string]string) *supervisor.Supervisor {
 	cfgFile := getSupervisorConfig(t, configType, extraConfigData)
-	s, err := supervisor.NewSupervisor(zap.NewNop(), cfgFile.Name())
+	cfg, err := config.LoadConfig(cfgFile.Name())
+	require.NoError(t, err)
+	s, err := supervisor.NewSupervisor(zap.NewNop(), cfg)
 	require.NoError(t, err)
 
 	return s

cmd/opampsupervisor/main.go

@@ -10,13 +10,25 @@ import (
 	"os/signal"
 
 	"github.com/open-telemetry/opentelemetry-collector-contrib/cmd/opampsupervisor/supervisor"
+	"github.com/open-telemetry/opentelemetry-collector-contrib/cmd/opampsupervisor/supervisor/config"
+	"github.com/open-telemetry/opentelemetry-collector-contrib/cmd/opampsupervisor/supervisor/telemetry"
 )
 
 func main() {
 	configFlag := flag.String("config", "", "Path to a supervisor configuration file")
 	flag.Parse()
 
-	supervisor, err := supervisor.NewSupervisor(*configFlag)
+	cfg, err := config.LoadConfig(*configFlag)
+	if err != nil {
+		log.Fatal("failed to load config: %w", err)
+	}
+
+	logger, err := telemetry.NewLogger(cfg.Telemetry.Logs)
+	if err != nil {
+		log.Fatal("failed to create logger: %w", err)
+	}
+
+	supervisor, err := supervisor.NewSupervisor(logger, cfg)
 	if err != nil {
 		log.Fatal("failed to create new supervisor: %w", err)
 	}

cmd/opampsupervisor/supervisor/config/config.go

@@ -13,6 +13,9 @@ import (
 	"runtime"
 	"time"
 
+	"github.com/knadh/koanf/parsers/yaml"
+	"github.com/knadh/koanf/providers/file"
+	"github.com/knadh/koanf/v2"
 	"github.com/open-telemetry/opamp-go/protobufs"
 	"go.opentelemetry.io/collector/config/configtls"
 	"go.uber.org/zap/zapcore"
@@ -201,3 +204,25 @@ func DefaultSupervisor() Supervisor {
 		},
 	}
 }
+
+func LoadConfig(configFile string) (Supervisor, error) {
+	if configFile == "" {
+		return Supervisor{}, errors.New("path to config file cannot be empty")
+	}
+
+	k := koanf.New("::")
+	if err := k.Load(file.Provider(configFile), yaml.Parser()); err != nil {
+		return Supervisor{}, err
+	}
+
+	decodeConf := koanf.UnmarshalConf{
+		Tag: "mapstructure",
+	}
+
+	cfg := DefaultSupervisor()
+	if err := k.UnmarshalWithConf("", &cfg, decodeConf); err != nil {
+		return Supervisor{}, fmt.Errorf("cannot parse %v: %w", configFile, err)
+	}
+
+	return cfg, nil
+}

cmd/opampsupervisor/supervisor/supervisor.go

@@ -40,7 +40,6 @@ import (
 	"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"
-	"github.com/open-telemetry/opentelemetry-collector-contrib/cmd/opampsupervisor/supervisor/telemetry"
 )
 
 var (
@@ -137,8 +136,10 @@ type Supervisor struct {
 	opampServerPort int
 }
 
-func NewSupervisor(configFile string) (*Supervisor, error) {
+func NewSupervisor(logger *zap.Logger, cfg config.Supervisor) (*Supervisor, error) {
 	s := &Supervisor{
+		config:                       cfg,
+		logger:                       logger,
 		pidProvider:                  defaultPIDProvider{},
 		hasNewConfig:                 make(chan struct{}, 1),
 		agentConfigOwnMetricsSection: &atomic.Value{},
@@ -153,10 +154,6 @@ func NewSupervisor(configFile string) (*Supervisor, error) {
 		return nil, err
 	}
 
-	if err := s.loadConfig(configFile); err != nil {
-		return nil, fmt.Errorf("error loading config: %w", err)
-	}
-
 	if err := s.config.Validate(); err != nil {
 		return nil, fmt.Errorf("error validating config: %w", err)
 	}
@@ -165,12 +162,6 @@ func NewSupervisor(configFile string) (*Supervisor, error) {
 		return nil, fmt.Errorf("error creating storage dir: %w", err)
 	}
 
-	logger, err := telemetry.NewLogger(s.config.Telemetry.Logs)
-	if err != nil {
-		return nil, fmt.Errorf("error creating logger: %w", err)
-	}
-	s.logger = logger
-
 	return s, nil
 }
 

cmd/opampsupervisor/supervisor/telemetry/logger.go

@@ -1,3 +1,6 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
 package telemetry
 
 import (