Initial implementation for multiple outputs

.gitignore

@@ -1,3 +1,4 @@
 pkg/
 tivan
 .vagrant
+telegraf

agent.go

@@ -3,16 +3,20 @@ package telegraf
 import (
 	"fmt"
 	"log"
-	"net/url"
 	"os"
 	"sort"
 	"sync"
 	"time"
 
-	"github.com/influxdb/influxdb/client"
+	"github.com/influxdb/telegraf/outputs"
 	"github.com/influxdb/telegraf/plugins"
 )
 
+type runningOutput struct {
+	name   string
+	output outputs.Output
+}
+
 type runningPlugin struct {
 	name   string
 	plugin plugins.Plugin
@@ -31,9 +35,8 @@ type Agent struct {
 
 	Config *Config
 
+	outputs []*runningOutput
 	plugins []*runningPlugin
-
-	conn *client.Client
 }
 
 // NewAgent returns an Agent struct based off the given Config
@@ -54,39 +57,42 @@ func NewAgent(config *Config) (*Agent, error) {
 		agent.Hostname = hostname
 	}
 
-	if config.Tags == nil {
-		config.Tags = map[string]string{}
-	}
-
-	config.Tags["host"] = agent.Hostname
-
 	return agent, nil
 }
 
-// Connect connects to the agent's config URL
 func (a *Agent) Connect() error {
-	config := a.Config
-
-	u, err := url.Parse(config.URL)
-	if err != nil {
-		return err
+	for _, o := range a.outputs {
+		err := o.output.Connect(a.Hostname)
+		if err != nil {
+			return err
+		}
 	}
+	return nil
+}
 
-	c, err := client.NewClient(client.Config{
-		URL:       *u,
-		Username:  config.Username,
-		Password:  config.Password,
-		UserAgent: config.UserAgent,
-		Timeout:   config.Timeout.Duration,
-	})
+func (a *Agent) LoadOutputs() ([]string, error) {
+	var names []string
 
-	if err != nil {
-		return err
+	for _, name := range a.Config.OutputsDeclared() {
+		creator, ok := outputs.Outputs[name]
+		if !ok {
+			return nil, fmt.Errorf("Undefined but requested output: %s", name)
+		}
+
+		output := creator()
+
+		err := a.Config.ApplyOutput(name, output)
+		if err != nil {
+			return nil, err
+		}
+
+		a.outputs = append(a.outputs, &runningOutput{name, output})
+		names = append(names, name)
 	}
 
-	a.conn = c
+	sort.Strings(names)
 
-	return nil
+	return names, nil
 }
 
 // LoadPlugins loads the agent's plugins
@@ -144,17 +150,14 @@ func (a *Agent) crankParallel() error {
 
 	close(points)
 
-	var acc BatchPoints
-	acc.Tags = a.Config.Tags
-	acc.Time = time.Now()
-	acc.Database = a.Config.Database
+	var bp BatchPoints
+	bp.Time = time.Now()
 
 	for sub := range points {
-		acc.Points = append(acc.Points, sub.Points...)
+		bp.Points = append(bp.Points, sub.Points...)
 	}
 
-	_, err := a.conn.Write(acc.BatchPoints)
-	return err
+	return a.flush(&bp)
 }
 
 func (a *Agent) crank() error {
@@ -171,12 +174,9 @@ func (a *Agent) crank() error {
 		}
 	}
 
-	acc.Tags = a.Config.Tags
 	acc.Time = time.Now()
-	acc.Database = a.Config.Database
 
-	_, err := a.conn.Write(acc.BatchPoints)
-	return err
+	return a.flush(&acc)
 }
 
 func (a *Agent) crankSeparate(shutdown chan struct{}, plugin *runningPlugin) error {
@@ -194,11 +194,12 @@ func (a *Agent) crankSeparate(shutdown chan struct{}, plugin *runningPlugin) err
 			return err
 		}
 
-		acc.Tags = a.Config.Tags
 		acc.Time = time.Now()
-		acc.Database = a.Config.Database
 
-		a.conn.Write(acc.BatchPoints)
+		err = a.flush(&acc)
+		if err != nil {
+			return err
+		}
 
 		select {
 		case <-shutdown:
@@ -209,6 +210,22 @@ func (a *Agent) crankSeparate(shutdown chan struct{}, plugin *runningPlugin) err
 	}
 }
 
+func (a *Agent) flush(bp *BatchPoints) error {
+	var wg sync.WaitGroup
+	var outerr error
+	for _, o := range a.outputs {
+		wg.Add(1)
+		go func(ro *runningOutput) {
+			defer wg.Done()
+			outerr = ro.output.Write(bp.BatchPoints)
+		}(o)
+	}
+
+	wg.Wait()
+
+	return outerr
+}
+
 // TestAllPlugins verifies that we can 'Gather' from all plugins with the
 // default configuration
 func (a *Agent) TestAllPlugins() error {
@@ -267,13 +284,6 @@ func (a *Agent) Test() error {
 
 // Run runs the agent daemon, gathering every Interval
 func (a *Agent) Run(shutdown chan struct{}) error {
-	if a.conn == nil {
-		err := a.Connect()
-		if err != nil {
-			return err
-		}
-	}
-
 	var wg sync.WaitGroup
 
 	for _, plugin := range a.plugins {

cmd/telegraf/telegraf.go

@@ -9,6 +9,7 @@ import (
 	"strings"
 
 	"github.com/influxdb/telegraf"
+	_ "github.com/influxdb/telegraf/outputs/all"
 	_ "github.com/influxdb/telegraf/plugins/all"
 )
 
@@ -61,6 +62,11 @@ func main() {
 		ag.Debug = true
 	}
 
+	outputs, err := ag.LoadOutputs()
+	if err != nil {
+		log.Fatal(err)
+	}
+
 	plugins, err := ag.LoadPlugins()
 	if err != nil {
 		log.Fatal(err)
@@ -96,19 +102,15 @@ func main() {
 		close(shutdown)
 	}()
 
-	log.Print("InfluxDB Agent running")
+	log.Print("Telegraf Agent running")
+	log.Printf("Loaded outputs: %s", strings.Join(outputs, " "))
 	log.Printf("Loaded plugins: %s", strings.Join(plugins, " "))
 	if ag.Debug {
 		log.Printf("Debug: enabled")
 		log.Printf("Agent Config: Interval:%s, Debug:%#v, Hostname:%#v\n",
 			ag.Interval, ag.Debug, ag.Hostname)
 	}
 
-	if config.URL != "" {
-		log.Printf("Sending metrics to: %s", config.URL)
-		log.Printf("Tags enabled: %v", config.ListTags())
-	}
-
 	if *fPidfile != "" {
 		f, err := os.Create(*fPidfile)
 		if err != nil {

config.go

@@ -30,27 +30,25 @@ func (d *Duration) UnmarshalTOML(b []byte) error {
 	return nil
 }
 
-// Config specifies the URL/user/password for the database that telegraf
+// Config specifies the outputs that telegraf
 // will be logging to, as well as all the plugins that the user has
 // specified
 type Config struct {
-	URL       string
-	Username  string
-	Password  string
-	Database  string
-	UserAgent string
-	Timeout   Duration
-	Tags      map[string]string
-
 	agent   *ast.Table
 	plugins map[string]*ast.Table
+	outputs map[string]*ast.Table
 }
 
 // Plugins returns the configured plugins as a map of name -> plugin toml
 func (c *Config) Plugins() map[string]*ast.Table {
 	return c.plugins
 }
 
+// Outputs returns the configured outputs as a map of name -> output toml
+func (c *Config) Outputs() map[string]*ast.Table {
+	return c.outputs
+}
+
 // ConfiguredPlugin containing a name, interval, and drop/pass prefix lists
 type ConfiguredPlugin struct {
 	Name string
@@ -86,6 +84,15 @@ func (cp *ConfiguredPlugin) ShouldPass(measurement string) bool {
 	return true
 }
 
+// ApplyOutput loads the toml config into the given interface
+func (c *Config) ApplyOutput(name string, v interface{}) error {
+	if c.outputs[name] != nil {
+		return toml.UnmarshalTable(c.outputs[name], v)
+	}
+
+	return nil
+}
+
 // ApplyAgent loads the toml config into the given interface
 func (c *Config) ApplyAgent(v interface{}) error {
 	if c.agent != nil {
@@ -151,15 +158,24 @@ func (c *Config) ApplyPlugin(name string, v interface{}) (*ConfiguredPlugin, err
 
 // PluginsDeclared returns the name of all plugins declared in the config.
 func (c *Config) PluginsDeclared() []string {
-	var plugins []string
+	return declared(c.plugins)
+}
+
+// OutputsDeclared returns the name of all outputs declared in the config.
+func (c *Config) OutputsDeclared() []string {
+	return declared(c.outputs)
+}
+
+func declared(endpoints map[string]*ast.Table) []string {
+	var names []string
 
-	for name := range c.plugins {
-		plugins = append(plugins, name)
+	for name, _ := range endpoints {
+		names = append(names, name)
 	}
 
-	sort.Strings(plugins)
+	sort.Strings(names)
 
-	return plugins
+	return names
 }
 
 // DefaultConfig returns an empty default configuration
@@ -183,6 +199,7 @@ func LoadConfig(path string) (*Config, error) {
 
 	c := &Config{
 		plugins: make(map[string]*ast.Table),
+		outputs: make(map[string]*ast.Table),
 	}
 
 	for name, val := range tbl.Fields {
@@ -192,13 +209,16 @@ func LoadConfig(path string) (*Config, error) {
 		}
 
 		switch name {
-		case "influxdb":
-			err := toml.UnmarshalTable(subtbl, c)
-			if err != nil {
-				return nil, err
-			}
 		case "agent":
 			c.agent = subtbl
+		case "outputs":
+			for outputName, outputVal := range subtbl.Fields {
+				outputSubtbl, ok := outputVal.(*ast.Table)
+				if !ok {
+					return nil, errInvalidConfig
+				}
+				c.outputs[outputName] = outputSubtbl
+			}
 		default:
 			c.plugins[name] = subtbl
 		}
@@ -207,20 +227,6 @@ func LoadConfig(path string) (*Config, error) {
 	return c, nil
 }
 
-// ListTags returns a string of tags specified in the config,
-// line-protocol style
-func (c *Config) ListTags() string {
-	var tags []string
-
-	for k, v := range c.Tags {
-		tags = append(tags, fmt.Sprintf("%s=%s", k, v))
-	}
-
-	sort.Strings(tags)
-
-	return strings.Join(tags, " ")
-}
-
 type hasConfig interface {
 	BasicConfig() string
 }
@@ -253,8 +259,11 @@ var header = `# Telegraf configuration
 # NOTE: The configuration has a few required parameters. They are marked
 # with 'required'. Be sure to edit those to make this configuration work.
 
+# OUTPUTS
+[outputs]
+
 # Configuration for influxdb server to send metrics to
-[influxdb]
+[outputs.influxdb]
 # The full HTTP endpoint URL for your InfluxDB instance
 url = "http://localhost:8086" # required.
 
@@ -271,12 +280,8 @@ database = "telegraf" # required.
 
 # Set the user agent for the POSTs (can be useful for log differentiation)
 # user_agent = "telegraf"
-# tags = { "dc": "us-east-1" }
-
-# Tags can also be specified via a normal map, but only one form at a time:
 
-# [influxdb.tags]
-# dc = "us-east-1"
+# tags = { "dc" = "us-east-1" }
 
 # Configuration for telegraf itself
 # [agent]