build: rename config.go file

to config_prod.go in preparation for adding a shared config.go file.

build/config_prod.go

@@ -0,0 +1,65 @@
+//go:build !dev
+// +build !dev
+
+package build
+
+import "github.com/btcsuite/btclog/v2"
+
+const (
+	callSiteOff   = "off"
+	callSiteShort = "short"
+	callSiteLong  = "long"
+)
+
+// LogConfig holds logging configuration options.
+//
+//nolint:lll
+type LogConfig struct {
+	Console *LoggerConfig `group:"console" namespace:"console" description:"The logger writing to stdout and stderr."`
+	File    *LoggerConfig `group:"file" namespace:"file" description:"The logger writing to LND's standard log file."`
+}
+
+// DefaultLogConfig returns the default logging config options.
+func DefaultLogConfig() *LogConfig {
+	return &LogConfig{
+		Console: &LoggerConfig{
+			CallSite: callSiteOff,
+		},
+		File: &LoggerConfig{
+			CallSite: callSiteOff,
+		},
+	}
+}
+
+// LoggerConfig holds options for a particular logger.
+//
+//nolint:lll
+type LoggerConfig struct {
+	Disable      bool   `long:"disable" description:"Disable this logger."`
+	NoTimestamps bool   `long:"no-timestamps" description:"Omit timestamps from log lines."`
+	CallSite     string `long:"call-site" description:"Include the call-site of each log line." choice:"off" choice:"short" choice:"long"`
+}
+
+// HandlerOptions returns the set of btclog.HandlerOptions that the state of the
+// config struct translates to.
+func (cfg *LoggerConfig) HandlerOptions() []btclog.HandlerOption {
+	opts := []btclog.HandlerOption{
+		// The default skip depth used by the logging library is 6 but
+		// since we wrap the logging handlers with another level of
+		// abstraction with the handlerSet, we increase the skip depth
+		// to 7 here.
+		btclog.WithCallSiteSkipDepth(7),
+	}
+	if cfg.NoTimestamps {
+		opts = append(opts, btclog.WithNoTimestamp())
+	}
+
+	switch cfg.CallSite {
+	case callSiteShort:
+		opts = append(opts, btclog.WithCallerFlags(btclog.Lshortfile))
+	case callSiteLong:
+		opts = append(opts, btclog.WithCallerFlags(btclog.Llongfile))
+	}
+
+	return opts
+}