Add timeout options to httpSink

sinks/httpSink.go

@@ -19,6 +19,9 @@ type HttpSinkConfig struct {
 	Database        string `json:"database,omitempty"`
 	JWT             string `json:"jwt,omitempty"`
 	SSL             bool   `json:"ssl,omitempty"`
+	Timeout         string `json:"timeout,omitempty"`
+	MaxIdleConns    int    `json:"max_idle_connections,omitempty"`
+	IdleConnTimeout string `json:"idle_connection_timeout,omitempty"`
 }
 
 type HttpSink struct {
@@ -28,11 +31,17 @@ type HttpSink struct {
 	encoder         *influx.Encoder
 	buffer          *bytes.Buffer
 	config          HttpSinkConfig
+	maxIdleConns    int
+	idleConnTimeout time.Duration
+	timeout         time.Duration
 }
 
 func (s *HttpSink) Init(config json.RawMessage) error {
 	s.name = "HttpSink"
 	s.config.SSL = false
+	s.config.MaxIdleConns = 10
+	s.config.IdleConnTimeout = "5s"
+	s.config.Timeout = "5s"
 	if len(config) > 0 {
 		err := json.Unmarshal(config, &s.config)
 		if err != nil {
@@ -42,8 +51,26 @@ func (s *HttpSink) Init(config json.RawMessage) error {
 	if len(s.config.Host) == 0 || len(s.config.Port) == 0 || len(s.config.Database) == 0 {
 		return errors.New("`host`, `port` and `database` config options required for TCP sink")
 	}
-
-	s.client = &http.Client{}
+	if s.config.MaxIdleConns > 0 {
+		s.maxIdleConns = s.config.MaxIdleConns
+	}
+	if len(s.config.IdleConnTimeout) > 0 {
+		t, err := time.ParseDuration(s.config.IdleConnTimeout)
+		if err == nil {
+			s.idleConnTimeout = t
+		}
+	}
+	if len(s.config.Timeout) > 0 {
+		t, err := time.ParseDuration(s.config.Timeout)
+		if err == nil {
+			s.timeout = t
+		}
+	}
+	tr := &http.Transport{
+		MaxIdleConns:    s.maxIdleConns,
+		IdleConnTimeout: s.idleConnTimeout,
+	}
+	s.client = &http.Client{Transport: tr, Timeout: s.timeout}
 	proto := "http"
 	if s.config.SSL {
 		proto = "https"
@@ -58,7 +85,8 @@ func (s *HttpSink) Init(config json.RawMessage) error {
 }
 
 func (s *HttpSink) Write(m lp.CCMetric) error {
-	_, err := s.encoder.Encode(m.ToPoint(s.config.MetaAsTags))
+	p := m.ToPoint(s.config.MetaAsTags)
+	_, err := s.encoder.Encode(p)
 	return err
 }
 

sinks/httpSink.md

@@ -13,7 +13,10 @@ The `http` sink uses POST requests to a HTTP server to submit the metrics in the
     "host": "dbhost.example.com",
     "port": "4222",
     "jwt" : "0x0000q231",
-    "ssl" : false
+    "ssl" : false,
+    "timeout": "5s",
+    "max_idle_connections" : 10,
+    "idle_connection_timeout" : "5s"
   }
 }
 ```
@@ -25,3 +28,6 @@ The `http` sink uses POST requests to a HTTP server to submit the metrics in the
 - `port`: Portnumber (as string) of the InfluxDB database server
 - `jwt`: JSON web tokens for authentification
 - `ssl`: Activate SSL encryption
+- `timeout`: General timeout for the HTTP client (default '5s')
+- `max_idle_connections`: Maximally idle connections (default 10)
+- `idle_connection_timeout`: Timeout for idle connections (default '5s')