feat(zerolog): Add default log level helpers

go.mod

@@ -8,6 +8,7 @@ require (
 	github.com/labstack/echo/v4 v4.10.2
 	github.com/pkg/errors v0.9.1
 	github.com/rs/zerolog v1.29.0
+	github.com/sethvargo/go-envconfig v0.9.0
 	github.com/stretchr/testify v1.8.1
 	go.opentelemetry.io/otel v1.13.0
 	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v0.36.0

go.sum

@@ -169,6 +169,8 @@ github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFR
 github.com/rs/xid v1.4.0/go.mod h1:trrq9SKmegXys3aeAKXMUTdJsYXVwGY3RLcfgqegfbg=
 github.com/rs/zerolog v1.29.0 h1:Zes4hju04hjbvkVkOhdl2HpZa+0PmVwigmo8XoORE5w=
 github.com/rs/zerolog v1.29.0/go.mod h1:NILgTygv/Uej1ra5XxGf82ZFSLk58MFGAUS2o6usyD0=
+github.com/sethvargo/go-envconfig v0.9.0 h1:Q6FQ6hVEeTECULvkJZakq3dZMeBQ3JUpcKMfPQbKMDE=
+github.com/sethvargo/go-envconfig v0.9.0/go.mod h1:Iz1Gy1Sf3T64TQlJSvee81qDhf7YIlt8GMUX6yyNFs0=
 github.com/spaolacci/murmur3 v0.0.0-20180118202830-f09979ecbc72/go.mod h1:JwIasOWyU6f++ZhiEuf87xNszmSA2myDM2Kzu9HwQUA=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=

loglevel/loglevel.go

@@ -0,0 +1,70 @@
+package loglevel
+
+import (
+	"context"
+	"os"
+
+	"github.com/rs/zerolog"
+	"github.com/sethvargo/go-envconfig"
+)
+
+type Config struct {
+	Debug bool `env:"DEBUG,default=false"`
+}
+
+func SetGlobal() {
+	var c Config
+	if err := envconfig.Process(context.Background(), &c); err != nil {
+		// do nothing, leave it at the default "not debug, therefore info+"
+	}
+
+	zerolog.SetGlobalLevel(zerolog.InfoLevel)
+	if c.Debug {
+		zerolog.SetGlobalLevel(zerolog.DebugLevel)
+	}
+}
+
+func SetLoggerLevel(l zerolog.Logger) zerolog.Logger {
+	lvl := zerolog.InfoLevel
+	var c Config
+	if err := envconfig.Process(context.Background(), &c); err != nil {
+		// do nothing, leave it at the default "not debug, therefore info+"
+	}
+
+	if c.Debug {
+		lvl = zerolog.DebugLevel
+	}
+
+	return l.Level(lvl)
+}
+
+func FromEnv(prefix string) zerolog.Level {
+	return FromLookuper(prefix, envconfig.OsLookuper())
+}
+
+func FromLookuper(prefix string, l envconfig.Lookuper) zerolog.Level {
+	l = envconfig.PrefixLookuper(prefix, l)
+	c := getC(l)
+
+	if c.Debug {
+		return zerolog.DebugLevel
+	}
+
+	return zerolog.InfoLevel
+}
+
+func getC(l envconfig.Lookuper) Config {
+	var c Config
+	if err := envconfig.ProcessWith(context.Background(), &c, l); err != nil {
+		// do nothing
+	}
+	return c
+}
+
+func Baseline(prefix string) zerolog.Logger {
+	zerolog.TimeFieldFormat = zerolog.TimeFormatUnix
+	return zerolog.New(os.Stderr).With().
+		Timestamp().
+		Logger().
+		Level(FromEnv(prefix))
+}