influxdb output: close connections & dont always overwrite

closes #1058
closes #1059

also see https://github.com/influxdata/influxdb/pull/6425

CHANGELOG.md

@@ -1,6 +1,7 @@
 ## v0.13 [unreleased]
 
 ### Release Notes
+
 - **Breaking Change**: docker plugin tags. The cont_id tag no longer exists, it
 will now be a field, and be called container_id. Additionally, cont_image and
 cont_name are being renamed to container_image and container_name.
@@ -15,7 +16,7 @@ So adding "container" to each metric will:
 (1) make it more clear that these metrics are per-container, and
 (2) allow users to easily drop per-container metrics if cardinality is an
 issue (`namedrop = ["docker_container_*"]`)
-- `tagexclude` and `tagexclude` are now available, which can be used to remove
+- `tagexclude` and `taginclude` are now available, which can be used to remove
 tags from measurements on inputs and outputs. See
 [the configuration doc](https://github.com/influxdata/telegraf/blob/master/docs/CONFIGURATION.md)
 for more details.
@@ -25,14 +26,17 @@ based on _prefix_ in addition to globs. This means that a filter like
 `fielddrop = ["time_"]` will need to be changed to `fielddrop = ["time_*"]`
 
 ### Features
+
 - [#1017](https://github.com/influxdata/telegraf/pull/1017): taginclude and tagexclude arguments.
 - [#1015](https://github.com/influxdata/telegraf/pull/1015): Docker plugin schema refactor.
 - [#889](https://github.com/influxdata/telegraf/pull/889): Improved MySQL plugin. Thanks @maksadbek!
 
 ### Bugfixes
+
 - [#921](https://github.com/influxdata/telegraf/pull/921): mqtt_consumer stops gathering metrics. Thanks @chaton78!
 - [#1013](https://github.com/influxdata/telegraf/pull/1013): Close dead riemann output connections. Thanks @echupriyanov!
 - [#1012](https://github.com/influxdata/telegraf/pull/1012): Set default tags in test accumulator.
+- [#1058](https://github.com/influxdata/telegraf/issues/1058): Fix possible leaky TCP connections in influxdb output.
 
 ## v0.12.1 [2016-04-14]
 

Godeps

@@ -24,7 +24,7 @@ github.com/gorilla/context 1ea25387ff6f684839d82767c1733ff4d4d15d0a
 github.com/gorilla/mux c9e326e2bdec29039a3761c07bece13133863e1e
 github.com/hailocab/go-hostpool e80d13ce29ede4452c43dea11e79b9bc8a15b478
 github.com/influxdata/config b79f6829346b8d6e78ba73544b1e1038f1f1c9da
-github.com/influxdata/influxdb e3fef5593c21644f2b43af55d6e17e70910b0e48
+github.com/influxdata/influxdb 21db76b3374c733f37ed16ad93f3484020034351
 github.com/influxdata/toml af4df43894b16e3fd2b788d01bd27ad0776ef2d0
 github.com/klauspost/crc32 19b0b332c9e4516a6370a0456e6182c3b5036720
 github.com/lib/pq e182dc4027e2ded4b19396d638610f2653295f36

plugins/outputs/influxdb/influxdb.go

@@ -125,13 +125,9 @@ func (i *InfluxDB) Connect() error {
 				return err
 			}
 
-			// Create Database if it doesn't exist
-			_, e := c.Query(client.Query{
-				Command: fmt.Sprintf("CREATE DATABASE IF NOT EXISTS \"%s\"", i.Database),
-			})
-
-			if e != nil {
-				log.Println("Database creation failed: " + e.Error())
+			err = createDatabase(c, i.Database)
+			if err != nil {
+				log.Println("Database creation failed: " + err.Error())
 				continue
 			}
 
@@ -144,8 +140,24 @@ func (i *InfluxDB) Connect() error {
 	return nil
 }
 
+func createDatabase(c client.Client, database string) error {
+	// Create Database if it doesn't exist
+	_, err := c.Query(client.Query{
+		Command: fmt.Sprintf("CREATE DATABASE IF NOT EXISTS \"%s\"", database),
+	})
+	return err
+}
+
 func (i *InfluxDB) Close() error {
-	// InfluxDB client does not provide a Close() function
+	var errS string
+	for j, _ := range i.conns {
+		if err := i.conns[j].Close(); err != nil {
+			errS += err.Error()
+		}
+	}
+	if errS != "" {
+		return fmt.Errorf("output influxdb close failed: %s", errS)
+	}
 	return nil
 }
 
@@ -185,18 +197,21 @@ func (i *InfluxDB) Write(metrics []telegraf.Metric) error {
 	p := rand.Perm(len(i.conns))
 	for _, n := range p {
 		if e := i.conns[n].Write(bp); e != nil {
-			log.Println("ERROR: " + e.Error())
+			// Log write failure
+			log.Printf("ERROR: %s", e)
+			// If the database was not found, try to recreate it
+			if strings.Contains(e.Error(), "database not found") {
+				if errc := createDatabase(i.conns[n], i.Database); errc != nil {
+					log.Printf("ERROR: Database %s not found and failed to recreate\n",
+						i.Database)
+				}
+			}
 		} else {
 			err = nil
 			break
 		}
 	}
 
-	// If all of the writes failed, create a new connection array so that
-	// i.Connect() will be called on the next gather.
-	if err != nil {
-		i.conns = make([]client.Client, 0)
-	}
 	return err
 }