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plugins.go
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plugins.go
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package main
import (
"reflect"
"strings"
)
// Message represents data accross plugins
type Message struct {
Meta []byte // metadata
Data []byte // actual data
}
// PluginReader is an interface for input plugins
type PluginReader interface {
PluginRead() (msg *Message, err error)
}
// PluginWriter is an interface for output plugins
type PluginWriter interface {
PluginWrite(msg *Message) (n int, err error)
}
// PluginReadWriter is an interface for plugins that support reading and writing
type PluginReadWriter interface {
PluginReader
PluginWriter
}
// InOutPlugins struct for holding references to plugins
type InOutPlugins struct {
Inputs []PluginReader
Outputs []PluginWriter
All []interface{}
}
// extractLimitOptions detects if plugin get called with limiter support
// Returns address and limit
func extractLimitOptions(options string) (string, string) {
split := strings.Split(options, "|")
if len(split) > 1 {
return split[0], split[1]
}
return split[0], ""
}
// Automatically detects type of plugin and initialize it
//
// See this article if curious about reflect stuff below: http://blog.burntsushi.net/type-parametric-functions-golang
func (plugins *InOutPlugins) registerPlugin(constructor interface{}, options ...interface{}) {
var path, limit string
vc := reflect.ValueOf(constructor)
// Pre-processing options to make it work with reflect
vo := []reflect.Value{}
for _, oi := range options {
vo = append(vo, reflect.ValueOf(oi))
}
if len(vo) > 0 {
// Removing limit options from path
path, limit = extractLimitOptions(vo[0].String())
// Writing value back without limiter "|" options
vo[0] = reflect.ValueOf(path)
}
// Calling our constructor with list of given options
plugin := vc.Call(vo)[0].Interface()
if limit != "" {
plugin = NewLimiter(plugin, limit)
}
// Some of the output can be Readers as well because return responses
if r, ok := plugin.(PluginReader); ok {
plugins.Inputs = append(plugins.Inputs, r)
}
if w, ok := plugin.(PluginWriter); ok {
plugins.Outputs = append(plugins.Outputs, w)
}
plugins.All = append(plugins.All, plugin)
}
// NewPlugins specify and initialize all available plugins
func NewPlugins() *InOutPlugins {
plugins := new(InOutPlugins)
for _, options := range Settings.InputDummy {
plugins.registerPlugin(NewDummyInput, options)
}
for range Settings.OutputDummy {
plugins.registerPlugin(NewDummyOutput)
}
if Settings.OutputStdout {
plugins.registerPlugin(NewDummyOutput)
}
if Settings.OutputNull {
plugins.registerPlugin(NewNullOutput)
}
for _, options := range Settings.InputRAW {
plugins.registerPlugin(NewRAWInput, options, Settings.RAWInputConfig)
}
for _, options := range Settings.InputTCP {
plugins.registerPlugin(NewTCPInput, options, &Settings.InputTCPConfig)
}
for _, options := range Settings.OutputTCP {
plugins.registerPlugin(NewTCPOutput, options, &Settings.OutputTCPConfig)
}
for _, options := range Settings.InputFile {
plugins.registerPlugin(NewFileInput, options, Settings.InputFileLoop)
}
for _, path := range Settings.OutputFile {
if strings.HasPrefix(path, "s3://") {
plugins.registerPlugin(NewS3Output, path, &Settings.OutputFileConfig)
} else {
plugins.registerPlugin(NewFileOutput, path, &Settings.OutputFileConfig)
}
}
for _, options := range Settings.InputHTTP {
plugins.registerPlugin(NewHTTPInput, options)
}
// If we explicitly set Host header http output should not rewrite it
// Fix: https://github.com/buger/gor/issues/174
for _, header := range Settings.ModifierConfig.Headers {
if header.Name == "Host" {
Settings.OutputHTTPConfig.OriginalHost = true
break
}
}
for _, options := range Settings.OutputHTTP {
plugins.registerPlugin(NewHTTPOutput, options, &Settings.OutputHTTPConfig)
}
for _, options := range Settings.OutputBinary {
plugins.registerPlugin(NewBinaryOutput, options, &Settings.OutputBinaryConfig)
}
if Settings.OutputKafkaConfig.Host != "" && Settings.OutputKafkaConfig.Topic != "" {
plugins.registerPlugin(NewKafkaOutput, "", &Settings.OutputKafkaConfig, &Settings.KafkaTLSConfig)
}
if Settings.InputKafkaConfig.Host != "" && Settings.InputKafkaConfig.Topic != "" {
plugins.registerPlugin(NewKafkaInput, "", &Settings.InputKafkaConfig, &Settings.KafkaTLSConfig)
}
return plugins
}