feat: initial commit

internal/config/config.go

@@ -0,0 +1,64 @@
+package config
+
+import (
+	"io"
+	"io/ioutil"
+
+	"github.com/pkg/errors"
+	"gopkg.in/yaml.v3"
+)
+
+// Config definition
+type Config struct {
+	Admin  AdminServerConfig `yaml:"admin"`
+	Proxy  ProxyServerConfig `yaml:"proxy"`
+	Redis  RedisConfig       `yaml:"redis"`
+	Logger LoggerConfig      `yaml:"logger"`
+}
+
+// NewFromFile retrieves the configuration from the given file
+func NewFromFile(path string) (*Config, error) {
+	config := NewDefault()
+
+	data, err := ioutil.ReadFile(path)
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not read file '%s'", path)
+	}
+
+	if err := yaml.Unmarshal(data, config); err != nil {
+		return nil, errors.Wrapf(err, "could not unmarshal configuration")
+	}
+
+	return config, nil
+}
+
+// NewDumpDefault dump the new default configuration
+func NewDumpDefault() *Config {
+	config := NewDefault()
+
+	return config
+}
+
+// NewDefault return new default configuration
+func NewDefault() *Config {
+	return &Config{
+		Admin:  NewDefaultAdminServerConfig(),
+		Proxy:  NewDefaultProxyServerConfig(),
+		Logger: NewDefaultLoggerConfig(),
+		Redis:  NewDefaultRedisConfig(),
+	}
+}
+
+// Dump the given configuration in the given writer
+func Dump(config *Config, w io.Writer) error {
+	data, err := yaml.Marshal(config)
+	if err != nil {
+		return errors.Wrap(err, "could not dump config")
+	}
+
+	if _, err := w.Write(data); err != nil {
+		return errors.WithStack(err)
+	}
+
+	return nil
+}