How to add a plugin to Telegraf? - plugins

Question

Hello I would to know if someone have all ready add a plugin to telegraf for Influxdb.
I have my go code which is working. What do I need next and where to put theses files?
I've found that I need to do something like this:
type ReadFile struct {
//buf []byte
//MemoryBytes int64
//PID int
}
func (s *ReadFile) Description() string {
return "This is a test plugin to read data from a file and send them to influxdb" }
func (s *ReadFile) SampleConfig() string {
return "ok = true # indicate if everything is fine"
}
func Gather(acc plugins.Accumulator) error {
readFile(alarmFile)
acc.Add("alarm", result_of_readFile_here, tags)
}
}
func init() {
plugins.Add("readFile", func() plugins.Plugin { &ReadFile{} })
}
But is this my entire Go plugin or another file in Go to add with my Go program?
And where does the file.conf is store?
[tags]
dc = "alarm"
[agent]
interval = "10s"
# OUTPUTS
[outputs]
[outputs.influxdb]
url = "http://127.0.0.1:8086" # required.
database = "summer" # required.
precision = "s"
# PLUGINS
[readFile]
If you have a list of what I need, how to structure it, where I store file or maybe an example could be really helpful.
Thanks!!

Answer 1

-> I receive this, it gave me a better understanding, I think it could be helpful:
https://github.com/influxdata/telegraf/blob/master/CONTRIBUTING.md
"His plugin code looks good to go. He needs to place that file in $GOPATH/src/github.com/influxdata/telegraf/plugin/inputs/testPlugin/testPlugin.go
He should write a test for the plugin and place it at $GOPATH/src/github.com/influxdata/telegraf/plugin/inputs/testPlugin/testPlugin_test.go
After this is complete he needs to register the plugin at $GOPATH/src/github.com/influxdata/telegraf/plugin/inputs/all/all.go
Then he should run make from $GOPATH/src/github.com/influxdata/telegraf. This will place the new telegraf binary in $GOPATH/bin/telegraf.
Run the binary with the following flags to generate the valid configuration:
$GOPATH/bin/telegraf -sample-config -input-filter testPlugin -output-filter influxdb > testPlugin_config.conf
From there you can run the binary with the -test flag by passing it the sample config:
$GOPATH/bin/telegraf -config testPlugin_config.conf -test
This will output the line protocol that is to be inserted into the database."
-> And the testPlugin.go that he talks about:
package testPlugin
import (
"time"
)
type ReadFile struct {
counter int64
}
func (s *TestPlugin) Description() string {
return "This is a test plugin to write data to influxdb with a plugin"
}
func (s *TestPlugin) SampleConfig() string {
return "ok = true # indicate if everything is fine"
}
func Gather(acc telegraf.Accumulator) error {
c := time.Tick(10 * time.Second)
for now := range c {
counter := counter + 1
acc.Add("counter",counter, tags)
}
}
func init() {
inputs.Add("testPlugin", func() telegraf.Input { return &TestPlugin{} })
}

Answer 2

There's an opened issue for external plugin support which might be part of Telegraf 1.4.0. If will probably load external *.so files.
Until then all plugins are supposed to be merged into master repository via PRs. There are already many plugins waiting in review process. This model is obviously not very scalable.