Use defaults for Graphite input where necessary

CHANGELOG.md

@@ -7,6 +7,7 @@
 - [#2700](https://github.com/influxdb/influxdb/issues/2700): Incorrect error message in database EncodeFields
 - [#2897](https://github.com/influxdb/influxdb/pull/2897): Ensure target Graphite database exists
 - [#2898](https://github.com/influxdb/influxdb/pull/2898): Ensure target openTSDB database exists
+- [#2895](https://github.com/influxdb/influxdb/pull/2895): Use Graphite input defaults where necessary
 
 ## v0.9.0-rc33 [2015-06-09]
 

etc/config.sample.toml

@@ -79,8 +79,11 @@
 
 [[graphite]]
   enabled = false
-  # protocol = ""
-  # bind-address = ""
+  # bind-address = ":2003"
+  # protocol = "tcp"
+  # consistency-level = "one"
+  # name-separator = "."
+  # name-position = "last"
 
 ###
 ### [collectd]

services/graphite/config.go

@@ -55,3 +55,28 @@ func NewConfig() Config {
 func (c *Config) LastEnabled() bool {
 	return c.NamePosition == strings.ToLower("last")
 }
+
+// WithDefaults takes the given config and returns a new config with any required
+// default values set.
+func (c *Config) WithDefaults() *Config {
+	d := *c
+	if d.BindAddress == "" {
+		d.BindAddress = DefaultBindAddress
+	}
+	if d.Database == "" {
+		d.Database = DefaultDatabase
+	}
+	if d.Protocol == "" {
+		d.Protocol = DefaultProtocol
+	}
+	if d.NamePosition == "" {
+		d.NamePosition = DefaultNamePosition
+	}
+	if d.NameSeparator == "" {
+		d.NameSeparator = DefaultNameSeparator
+	}
+	if d.ConsistencyLevel == "" {
+		d.ConsistencyLevel = DefaultConsistencyLevel
+	}
+	return &d
+}

services/graphite/service.go

@@ -49,25 +49,28 @@ type Service struct {
 
 // NewService returns an instance of the Graphite service.
 func NewService(c Config) (*Service, error) {
+	// Use defaults where necessary.
+	d := c.WithDefaults()
+
 	s := Service{
-		bindAddress:  c.BindAddress,
-		database:     c.Database,
-		protocol:     c.Protocol,
-		batchSize:    c.BatchSize,
-		batchTimeout: time.Duration(c.BatchTimeout),
+		bindAddress:  d.BindAddress,
+		database:     d.Database,
+		protocol:     d.Protocol,
+		batchSize:    d.BatchSize,
+		batchTimeout: time.Duration(d.BatchTimeout),
 		logger:       log.New(os.Stderr, "[graphite] ", log.LstdFlags),
 		done:         make(chan struct{}),
 	}
 
-	consistencyLevel, err := cluster.ParseConsistencyLevel(c.ConsistencyLevel)
+	consistencyLevel, err := cluster.ParseConsistencyLevel(d.ConsistencyLevel)
 	if err != nil {
 		return nil, err
 	}
 	s.consistencyLevel = consistencyLevel
 
 	parser := NewParser()
-	parser.Separator = c.NameSeparator
-	parser.LastEnabled = c.LastEnabled()
+	parser.Separator = d.NameSeparator
+	parser.LastEnabled = d.LastEnabled()
 	s.parser = parser
 
 	return &s, nil