Use ctx everywhere & render exit errors properly

The `context.Context` related changes are neccessary as otherwise you
will have to wait for 5m when having Icinga notification started with
invalid database config due to the internal database.Connect retrials.
Lastly, the logging related changes are useful as we want to properly
render the stack traces when we unexpectedly exit from the main function
instead of wrapping the error in a confusing `zap.Error()` json key.

cmd/icinga-notifications-daemon/main.go

@@ -14,7 +14,7 @@ import (
 	"github.com/icinga/icinga-notifications/internal/icinga2"
 	"github.com/icinga/icinga-notifications/internal/incident"
 	"github.com/icinga/icinga-notifications/internal/listener"
-	"go.uber.org/zap"
+	"github.com/pkg/errors"
 	"os"
 	"os/signal"
 	"runtime"
@@ -62,24 +62,25 @@ func main() {
 	}
 
 	logger := logs.GetLogger()
+	defer func() { _ = logger.Sync() }()
+
 	logger.Infof("Starting Icinga Notifications daemon (%s)", internal.Version.Version)
 	db, err := database.NewDbFromConfig(&conf.Database, logs.GetChildLogger("database"), database.RetryConnectorCallbacks{})
 	if err != nil {
-		logger.Fatalw("cannot create database connection from config", zap.Error(err))
+		logger.Fatalf("%+v", errors.Wrap(err, "cannot create database connection from config"))
 	}
 	defer db.Close()
-	{
-		logger.Infof("Connecting to database at '%s'", db.GetAddr())
-		if err := db.Ping(); err != nil {
-			logger.Fatalw("cannot connect to database", zap.Error(err))
-		}
-	}
-
-	channel.UpsertPlugins(conf.ChannelPluginDir, logs.GetChildLogger("channel"), db)
 
 	ctx, cancel := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
 	defer cancel()
 
+	logger.Infof("Connecting to database at '%s'", db.GetAddr())
+	if err := db.PingContext(ctx); err != nil {
+		logger.Fatalf("Cannot connect to the database: %+v", err)
+	}
+
+	channel.UpsertPlugins(ctx, conf.ChannelPluginDir, logs.GetChildLogger("channel"), db)
+
 	icinga2Launcher := &icinga2.Launcher{
 		Ctx:           ctx,
 		Logs:          logs,
@@ -89,7 +90,7 @@ func main() {
 
 	runtimeConfig := config.NewRuntimeConfig(icinga2Launcher.Launch, logs, db)
 	if err := runtimeConfig.UpdateFromDatabase(ctx); err != nil {
-		logger.Fatalw("failed to load config from database", zap.Error(err))
+		logger.Fatalf("Failed to load config from database %+v", err)
 	}
 
 	icinga2Launcher.RuntimeConfig = runtimeConfig
@@ -98,13 +99,13 @@ func main() {
 
 	err = incident.LoadOpenIncidents(ctx, db, logs.GetChildLogger("incident"), runtimeConfig)
 	if err != nil {
-		logger.Fatalw("Can't load incidents from database", zap.Error(err))
+		logger.Fatalf("%+v", errors.Wrap(err, "cannot load incidents from database"))
 	}
 
 	// Wait to load open incidents from the database before either starting Event Stream Clients or starting the Listener.
 	icinga2Launcher.Ready()
 	if err := listener.NewListener(db, runtimeConfig, logs).Run(ctx); err != nil {
-		logger.Errorw("Listener has finished with an error", zap.Error(err))
+		logger.Errorf("%+v", errors.Wrap(err, "listener has finished with an error"))
 	} else {
 		logger.Info("Listener has finished")
 	}

internal/channel/plugin.go

@@ -2,6 +2,7 @@ package channel
 
 import (
 	"bufio"
+	"context"
 	"encoding/json"
 	"fmt"
 	"github.com/icinga/icinga-go-library/database"
@@ -166,7 +167,7 @@ func forwardLogs(errPipe io.Reader, logger *zap.SugaredLogger) {
 }
 
 // UpsertPlugins upsert the available_channel_type table with working plugins
-func UpsertPlugins(channelPluginDir string, logger *logging.Logger, db *database.DB) {
+func UpsertPlugins(ctx context.Context, channelPluginDir string, logger *logging.Logger, db *database.DB) {
 	logger.Debug("Updating available channel types")
 	files, err := os.ReadDir(channelPluginDir)
 	if err != nil {
@@ -209,7 +210,7 @@ func UpsertPlugins(channelPluginDir string, logger *logging.Logger, db *database
 	}
 
 	stmt, _ := db.BuildUpsertStmt(&plugin.Info{})
-	_, err = db.NamedExec(stmt, pluginInfos)
+	_, err = db.NamedExecContext(ctx, stmt, pluginInfos)
 	if err != nil {
 		logger.Errorw("Failed to update available channel types", zap.Error(err))
 	} else {