Allow selection of timestamp precision in HttpSink

sinks/httpSink.go

@@ -45,6 +45,9 @@ type HttpSinkConfig struct {
 
 	// Maximum number of retries to connect to the http server (default: 3)
 	MaxRetries int `json:"max_retries,omitempty"`
+
+	// Timestamp precision
+	Precision string `json:"precision,omitempty"`
 }
 
 type key_value_pair struct {
@@ -141,7 +144,7 @@ func (s *HttpSink) Write(m lp.CCMetric) error {
 
 	// Check that encoding worked
 	if err != nil {
-		return fmt.Errorf("Encoding failed: %v", err)
+		return fmt.Errorf("encoding failed: %v", err)
 	}
 
 	if s.config.flushDelay == 0 {
@@ -268,6 +271,7 @@ func NewHttpSink(name string, config json.RawMessage) (Sink, error) {
 	s.config.Timeout = "5s"
 	s.config.FlushDelay = "5s"
 	s.config.MaxRetries = 3
+	s.config.Precision = "ns"
 	cclog.ComponentDebug(s.name, "Init()")
 
 	// Read config
@@ -315,6 +319,19 @@ func NewHttpSink(name string, config json.RawMessage) (Sink, error) {
 			cclog.ComponentDebug(s.name, "Init(): flushDelay", t)
 		}
 	}
+	precision := influx.Nanosecond
+	if len(s.config.Precision) > 0 {
+		switch s.config.Precision {
+		case "s":
+			precision = influx.Second
+		case "ms":
+			precision = influx.Millisecond
+		case "us":
+			precision = influx.Microsecond
+		case "ns":
+			precision = influx.Nanosecond
+		}
+	}
 
 	// Create http client
 	s.client = &http.Client{
@@ -326,7 +343,7 @@ func NewHttpSink(name string, config json.RawMessage) (Sink, error) {
 	}
 
 	// Configure influx line protocol encoder
-	s.encoder.SetPrecision(influx.Nanosecond)
+	s.encoder.SetPrecision(precision)
 	s.extended_tag_list = make([]key_value_pair, 0)
 
 	return s, nil

sinks/httpSink.md

@@ -18,7 +18,8 @@ The `http` sink uses POST requests to a HTTP server to submit the metrics in the
     "timeout": "5s",
     "idle_connection_timeout" : "5s",
     "flush_delay": "2s",
-    "batch_size": 1000
+    "batch_size": 1000,
+    "precision": "s"
   }
 }
 ```
@@ -34,3 +35,4 @@ The `http` sink uses POST requests to a HTTP server to submit the metrics in the
 - `idle_connection_timeout`: Timeout for idle connections (default '120s'). Should be larger than the measurement interval to keep the connection open
 - `flush_delay`: Batch all writes arriving in during this duration (default '1s', batching can be disabled by setting it to 0)
 - `batch_size`: Maximal batch size. If `batch_size` is reached before the end of `flush_delay`, the metrics are sent without further delay
+- `precision`: Precision of the timestamp. Valid values are 's', 'ms', 'us' and 'ns'. (default is 'ns')