package telegraf import ( "fmt" "log" "os" "sort" "sync" "time" "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 config *ConfiguredPlugin } // Agent runs telegraf and collects data based on the given config type Agent struct { // Interval at which to gather information Interval Duration // Run in debug mode? Debug bool Hostname string Config *Config outputs []*runningOutput plugins []*runningPlugin } // NewAgent returns an Agent struct based off the given Config func NewAgent(config *Config) (*Agent, error) { agent := &Agent{Config: config, Interval: Duration{10 * time.Second}} err := config.ApplyAgent(agent) if err != nil { return nil, err } if agent.Hostname == "" { hostname, err := os.Hostname() if err != nil { return nil, err } agent.Hostname = hostname } return agent, nil } func (a *Agent) Connect() error { for _, o := range a.outputs { err := o.output.Connect(a.Hostname) if err != nil { return err } } return nil } func (a *Agent) LoadOutputs() ([]string, error) { var names []string 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) } sort.Strings(names) return names, nil } // LoadPlugins loads the agent's plugins func (a *Agent) LoadPlugins() ([]string, error) { var names []string for _, name := range a.Config.PluginsDeclared() { creator, ok := plugins.Plugins[name] if !ok { return nil, fmt.Errorf("Undefined but requested plugin: %s", name) } plugin := creator() config, err := a.Config.ApplyPlugin(name, plugin) if err != nil { return nil, err } a.plugins = append(a.plugins, &runningPlugin{name, plugin, config}) names = append(names, name) } sort.Strings(names) return names, nil } func (a *Agent) crankParallel() error { points := make(chan *BatchPoints, len(a.plugins)) var wg sync.WaitGroup for _, plugin := range a.plugins { if plugin.config.Interval != 0 { continue } wg.Add(1) go func(plugin *runningPlugin) { defer wg.Done() var acc BatchPoints acc.Debug = a.Debug acc.Prefix = plugin.name + "_" acc.Config = plugin.config plugin.plugin.Gather(&acc) points <- &acc }(plugin) } wg.Wait() close(points) var bp BatchPoints bp.Time = time.Now() for sub := range points { bp.Points = append(bp.Points, sub.Points...) } return a.flush(&bp) } func (a *Agent) crank() error { var acc BatchPoints acc.Debug = a.Debug for _, plugin := range a.plugins { acc.Prefix = plugin.name + "_" acc.Config = plugin.config err := plugin.plugin.Gather(&acc) if err != nil { return err } } acc.Time = time.Now() return a.flush(&acc) } func (a *Agent) crankSeparate(shutdown chan struct{}, plugin *runningPlugin) error { ticker := time.NewTicker(plugin.config.Interval) for { var acc BatchPoints acc.Debug = a.Debug acc.Prefix = plugin.name + "_" acc.Config = plugin.config err := plugin.plugin.Gather(&acc) if err != nil { return err } acc.Time = time.Now() err = a.flush(&acc) if err != nil { return err } select { case <-shutdown: return nil case <-ticker.C: continue } } } 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 { var names []string for name := range plugins.Plugins { names = append(names, name) } sort.Strings(names) var acc BatchPoints acc.Debug = true fmt.Printf("* Testing all plugins with default configuration\n") for _, name := range names { plugin := plugins.Plugins[name]() fmt.Printf("* Plugin: %s\n", name) acc.Prefix = name + "_" err := plugin.Gather(&acc) if err != nil { return err } } return nil } // Test verifies that we can 'Gather' from all plugins with their configured // Config struct func (a *Agent) Test() error { var acc BatchPoints acc.Debug = true for _, plugin := range a.plugins { acc.Prefix = plugin.name + "_" acc.Config = plugin.config fmt.Printf("* Plugin: %s\n", plugin.name) if plugin.config.Interval != 0 { fmt.Printf("* Internal: %s\n", plugin.config.Interval) } err := plugin.plugin.Gather(&acc) if err != nil { return err } } return nil } // Run runs the agent daemon, gathering every Interval func (a *Agent) Run(shutdown chan struct{}) error { var wg sync.WaitGroup for _, plugin := range a.plugins { if plugin.config.Interval != 0 { wg.Add(1) go func(plugin *runningPlugin) { defer wg.Done() a.crankSeparate(shutdown, plugin) }(plugin) } } defer wg.Wait() ticker := time.NewTicker(a.Interval.Duration) for { err := a.crankParallel() if err != nil { log.Printf("Error in plugins: %s", err) } select { case <-shutdown: return nil case <-ticker.C: continue } } }