config: LibCxt

This is a "global" context object currently containing a cancellation
context and logger.

This struct can be considered as the lib's generic configuration, and
may be asked for in any public function.

config/context.go

@@ -0,0 +1,58 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+package config
+
+import (
+	"context"
+	"strings"
+
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+)
+
+type LibCxt struct {
+	Logger  *zap.Logger
+	Context context.Context
+}
+
+func NewLibCxt(loglevel string) *LibCxt {
+	return &LibCxt{
+		Logger:  initLogger(loglevel),
+		Context: context.Background(),
+	}
+}
+
+func initLogger(ll string) *zap.Logger {
+	base := zap.NewProductionConfig()
+
+	base.Encoding = "console"
+	base.Level = zap.NewAtomicLevelAt(getLogLevel(ll))
+
+	base.EncoderConfig.EncodeTime = zapcore.ISO8601TimeEncoder
+	base.EncoderConfig.EncodeLevel = zapcore.CapitalLevelEncoder
+	base.DisableCaller = true
+	return zap.Must(base.Build())
+}
+
+func getLogLevel(ll string) zapcore.Level {
+	var level zapcore.Level
+
+	switch strings.ToUpper(ll) {
+	case "ERROR":
+		level = zap.ErrorLevel
+	case "WARN":
+		level = zap.WarnLevel
+	case "INFO":
+		level = zap.InfoLevel
+	case "DEBUG":
+		level = zap.DebugLevel
+	default:
+		level = zap.InfoLevel
+	}
+
+	return level
+}