feat: add basic prometheus metrics integration

internal/config/admin_server.go

@@ -1,16 +1,18 @@
 package config
 
 type AdminServerConfig struct {
-	HTTP HTTPConfig `yaml:"http"`
-	CORS CORSConfig `yaml:"cors"`
-	Auth AuthConfig `yaml:"auth"`
+	HTTP    HTTPConfig    `yaml:"http"`
+	CORS    CORSConfig    `yaml:"cors"`
+	Auth    AuthConfig    `yaml:"auth"`
+	Metrics MetricsConfig `yaml:"metrics"`
 }
 
 func NewDefaultAdminServerConfig() AdminServerConfig {
 	return AdminServerConfig{
-		HTTP: NewHTTPConfig("127.0.0.1", 8081),
-		CORS: NewDefaultCORSConfig(),
-		Auth: NewDefaultAuthConfig(),
+		HTTP:    NewHTTPConfig("127.0.0.1", 8081),
+		CORS:    NewDefaultCORSConfig(),
+		Auth:    NewDefaultAuthConfig(),
+		Metrics: NewDefaultMetricsConfig(),
 	}
 }
 

internal/config/logger.go

@@ -9,7 +9,7 @@ type LoggerConfig struct {
 
 func NewDefaultLoggerConfig() LoggerConfig {
 	return LoggerConfig{
-		Level:  InterpolatedInt(logger.LevelInfo),
+		Level:  InterpolatedInt(logger.LevelError),
 		Format: InterpolatedString(logger.FormatHuman),
 	}
 }

internal/config/metrics.go

@@ -0,0 +1,35 @@
+package config
+
+import "fmt"
+
+type MetricsConfig struct {
+	Enabled   InterpolatedBool   `yaml:"enabled"`
+	Endpoint  InterpolatedString `yaml:"endpoint"`
+	BasicAuth *BasicAuthConfig   `yaml:"basicAuth"`
+}
+
+type BasicAuthConfig struct {
+	Credentials *InterpolatedMap `yaml:"credentials"`
+}
+
+func (c *BasicAuthConfig) CredentialsMap() map[string]string {
+	if c.Credentials == nil {
+		return map[string]string{}
+	}
+
+	credentials := make(map[string]string, len(*c.Credentials))
+
+	for k, v := range *c.Credentials {
+		credentials[k] = fmt.Sprintf("%v", v)
+	}
+
+	return credentials
+}
+
+func NewDefaultMetricsConfig() MetricsConfig {
+	return MetricsConfig{
+		Enabled:   true,
+		Endpoint:  "/.bouncer/metrics",
+		BasicAuth: nil,
+	}
+}

internal/config/proxy_server.go

@@ -1,11 +1,13 @@
 package config
 
 type ProxyServerConfig struct {
-	HTTP HTTPConfig `yaml:"http"`
+	HTTP    HTTPConfig    `yaml:"http"`
+	Metrics MetricsConfig `yaml:"metrics"`
 }
 
 func NewDefaultProxyServerConfig() ProxyServerConfig {
 	return ProxyServerConfig{
-		HTTP: NewHTTPConfig("0.0.0.0", 8080),
+		HTTP:    NewHTTPConfig("0.0.0.0", 8080),
+		Metrics: NewDefaultMetricsConfig(),
 	}
 }