config

type Metrics struct {
	// Sets whether or not to enable the Prometheus metrics exporter
	OtelPrometheusExporterEnabled bool `envconfig:"OTEL_PROM_EXPORTER_ENABLED" default:"true"`
	// Sets the port which the Prometheus compatible metrics endpoint should be served on
	OtelPrometheusExporterPort int `envconfig:"OTEL_PROM_EXPORTER_PORT" default:"2223"`
	// Sets whether or not to enable the OTEL metrics exporter
	OtelHTTPExporterEnabled bool `envconfig:"OTEL_EXPORTER_OTLP_METRICS_ENABLED" default:"false"`
}

type Serving struct {
	// CurrentNamespace is the namespace that the interceptor is
	// currently running in
	CurrentNamespace string `envconfig:"KEDA_HTTP_CURRENT_NAMESPACE" required:"true"`
	// WatchNamespace is the namespace to watch for new HTTPScaledObjects.
	// Leave this empty to watch HTTPScaledObjects in all namespaces.
	WatchNamespace string `envconfig:"KEDA_HTTP_WATCH_NAMESPACE" default:""`
	// ProxyPort is the port that the public proxy should run on
	ProxyPort int `envconfig:"KEDA_HTTP_PROXY_PORT" required:"true"`
	// AdminPort is the port that the internal admin server should run on.
	// This is the server that the external scaler will issue metrics
	// requests to
	AdminPort int `envconfig:"KEDA_HTTP_ADMIN_PORT" required:"true"`
	// CacheSyncPeriod is the time interval for the controller-runtime cache to resync.
	// TODO: consider removing this to use the default value, otherwise align the env var name
	CacheSyncPeriod time.Duration `envconfig:"KEDA_HTTP_SCALER_CONFIG_MAP_INFORMER_RSYNC_PERIOD" default:"60m"`
	// The interceptor has an internal process that periodically fetches the state
	// of endpoints that is running the servers it forwards to.
	//
	// This is the interval (in milliseconds) representing how often to do a fetch
	// TODO: this is actually the informer resync period, not a poll interval, default is too aggressive
	EndpointsCachePollIntervalMS int `envconfig:"KEDA_HTTP_ENDPOINTS_CACHE_POLLING_INTERVAL_MS" default:"1000"`
	// ProxyTLSEnabled is a flag to specify whether the interceptor proxy should
	// be running using a TLS enabled server
	ProxyTLSEnabled bool `envconfig:"KEDA_HTTP_PROXY_TLS_ENABLED" default:"false"`
	// TLSCertPath is the path to read the certificate file from for the TLS server
	TLSCertPath string `envconfig:"KEDA_HTTP_PROXY_TLS_CERT_PATH" default:"/certs/tls.crt"`
	// TLSKeyPath is the path to read the private key file from for the TLS server
	TLSKeyPath string `envconfig:"KEDA_HTTP_PROXY_TLS_KEY_PATH" default:"/certs/tls.key"`
	// TLSCertStorePaths is a comma separated list of paths to read the certificate/key pairs for the TLS server
	TLSCertStorePaths string `envconfig:"KEDA_HTTP_PROXY_TLS_CERT_STORE_PATHS" default:""`
	// TLSSkipVerify is a boolean flag to specify whether the interceptor should skip TLS verification for upstreams
	TLSSkipVerify bool `envconfig:"KEDA_HTTP_PROXY_TLS_SKIP_VERIFY" default:"false"`
	// TLSPort is the port that the server should serve on if TLS is enabled
	TLSPort int `envconfig:"KEDA_HTTP_PROXY_TLS_PORT" default:"8443"`
	// ProfilingAddr if not empty, pprof will be available on this address, assuming host:port here
	ProfilingAddr string `envconfig:"PROFILING_BIND_ADDRESS" default:""`
	// EnableColdStartHeader enables/disables the X-KEDA-HTTP-Cold-Start response header
	EnableColdStartHeader bool `envconfig:"KEDA_HTTP_ENABLE_COLD_START_HEADER" default:"true"`
	// LogRequests enables/disables logging of incoming requests
	LogRequests bool `envconfig:"KEDA_HTTP_LOG_REQUESTS" default:"false"`
}

type Timeouts struct {
	// Connect is the per-attempt TCP dial timeout (net.Dialer.Timeout)
	Connect time.Duration `envconfig:"KEDA_HTTP_CONNECT_TIMEOUT" default:"500ms"`
	// KeepAlive is the interval between keepalive probes
	KeepAlive time.Duration `envconfig:"KEDA_HTTP_KEEP_ALIVE" default:"1s"`
	// ResponseHeaderTimeout is how long to wait between when the HTTP request
	// is sent to the backing app and when response headers need to arrive
	ResponseHeader time.Duration `envconfig:"KEDA_RESPONSE_HEADER_TIMEOUT" default:"500ms"`
	// WorkloadReplicas is how long to wait for the backing workload
	// to have 1 or more replicas before connecting and sending the HTTP request.
	WorkloadReplicas time.Duration `envconfig:"KEDA_CONDITION_WAIT_TIMEOUT" default:"20s"`
	// ForceHTTP2 toggles whether to try to force HTTP2 for all requests
	ForceHTTP2 bool `envconfig:"KEDA_HTTP_FORCE_HTTP2" default:"false"`
	// MaxIdleConns is the max number of idle connections to keep in the
	// interceptor's internal connection pool across all backend services.
	// Increase this if you proxy to many unique backend services.
	MaxIdleConns int `envconfig:"KEDA_HTTP_MAX_IDLE_CONNS" default:"1000"`
	// MaxIdleConnsPerHost is the max number of idle connections to keep per backend service.
	// Increase this if you observe many new connection establishments under load.
	MaxIdleConnsPerHost int `envconfig:"KEDA_HTTP_MAX_IDLE_CONNS_PER_HOST" default:"200"`
	// IdleConnTimeout is the timeout after which a connection in the interceptor's
	// internal connection pool will be closed
	IdleConnTimeout time.Duration `envconfig:"KEDA_HTTP_IDLE_CONN_TIMEOUT" default:"90s"`
	// TLSHandshakeTimeout is the max amount of time the interceptor will
	// wait to establish a TLS connection
	TLSHandshakeTimeout time.Duration `envconfig:"KEDA_HTTP_TLS_HANDSHAKE_TIMEOUT" default:"10s"`
	// ExpectContinueTimeout is the max amount of time the interceptor will wait
	// for a 100 Continue response from the backend after sending request headers
	// with Expect: 100-continue
	ExpectContinueTimeout time.Duration `envconfig:"KEDA_HTTP_EXPECT_CONTINUE_TIMEOUT" default:"1s"`
	// DialRetryTimeout caps the total time spent retrying failed dial attempts.
	DialRetryTimeout time.Duration `envconfig:"KEDA_HTTP_DIAL_RETRY_TIMEOUT" default:"15s"`
}

type Tracing struct {
	// States whether tracing should be enabled, False by default
	Enabled bool `envconfig:"OTEL_EXPORTER_OTLP_TRACES_ENABLED" default:"false"`
	// Sets what tracing export to use, must be one of: console,http/protobuf, grpc
	Exporter string `envconfig:"OTEL_EXPORTER_OTLP_TRACES_PROTOCOL" default:"console"`
}