147 lines
3.2 KiB
Go
147 lines
3.2 KiB
Go
package influxdb
|
|
|
|
import (
|
|
"encoding/json"
|
|
"errors"
|
|
"fmt"
|
|
"net/http"
|
|
"strings"
|
|
"sync"
|
|
|
|
"github.com/influxdb/telegraf/plugins"
|
|
)
|
|
|
|
type InfluxDB struct {
|
|
URLs []string `toml:"urls"`
|
|
}
|
|
|
|
func (*InfluxDB) Description() string {
|
|
return "Read InfluxDB-formatted JSON metrics from one or more HTTP endpoints"
|
|
}
|
|
|
|
func (*InfluxDB) SampleConfig() string {
|
|
return `
|
|
# Works with InfluxDB debug endpoints out of the box,
|
|
# but other services can use this format too.
|
|
# See the influxdb plugin's README for more details.
|
|
|
|
# Multiple URLs from which to read InfluxDB-formatted JSON
|
|
urls = [
|
|
"http://localhost:8086/debug/vars"
|
|
]
|
|
`
|
|
}
|
|
|
|
func (i *InfluxDB) Gather(acc plugins.Accumulator) error {
|
|
errorChannel := make(chan error, len(i.URLs))
|
|
|
|
var wg sync.WaitGroup
|
|
for _, u := range i.URLs {
|
|
wg.Add(1)
|
|
go func(url string) {
|
|
defer wg.Done()
|
|
if err := i.gatherURL(acc, url); err != nil {
|
|
errorChannel <- fmt.Errorf("[url=%s]: %s", url, err)
|
|
}
|
|
}(u)
|
|
}
|
|
|
|
wg.Wait()
|
|
close(errorChannel)
|
|
|
|
// If there weren't any errors, we can return nil now.
|
|
if len(errorChannel) == 0 {
|
|
return nil
|
|
}
|
|
|
|
// There were errors, so join them all together as one big error.
|
|
errorStrings := make([]string, 0, len(errorChannel))
|
|
for err := range errorChannel {
|
|
errorStrings = append(errorStrings, err.Error())
|
|
}
|
|
|
|
return errors.New(strings.Join(errorStrings, "\n"))
|
|
}
|
|
|
|
type point struct {
|
|
Name string `json:"name"`
|
|
Tags map[string]string `json:"tags"`
|
|
Values map[string]interface{} `json:"values"`
|
|
}
|
|
|
|
// Gathers data from a particular URL
|
|
// Parameters:
|
|
// acc : The telegraf Accumulator to use
|
|
// url : endpoint to send request to
|
|
//
|
|
// Returns:
|
|
// error: Any error that may have occurred
|
|
func (i *InfluxDB) gatherURL(
|
|
acc plugins.Accumulator,
|
|
url string,
|
|
) error {
|
|
resp, err := http.Get(url)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer resp.Body.Close()
|
|
|
|
// It would be nice to be able to decode into a map[string]point, but
|
|
// we'll get a decoder error like:
|
|
// `json: cannot unmarshal array into Go value of type influxdb.point`
|
|
// if any of the values aren't objects.
|
|
// To avoid that error, we decode by hand.
|
|
dec := json.NewDecoder(resp.Body)
|
|
|
|
// Parse beginning of object
|
|
if t, err := dec.Token(); err != nil {
|
|
return err
|
|
} else if t != json.Delim('{') {
|
|
return errors.New("document root must be a JSON object")
|
|
}
|
|
|
|
// Loop through rest of object
|
|
for {
|
|
// Nothing left in this object, we're done
|
|
if !dec.More() {
|
|
break
|
|
}
|
|
|
|
// Read in a string key. We don't do anything with the top-level keys, so it's discarded.
|
|
_, err := dec.Token()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Attempt to parse a whole object into a point.
|
|
// It might be a non-object, like a string or array.
|
|
// If we fail to decode it into a point, ignore it and move on.
|
|
var p point
|
|
if err := dec.Decode(&p); err != nil {
|
|
continue
|
|
}
|
|
|
|
// If the object was a point, but was not fully initialized, ignore it and move on.
|
|
if p.Name == "" || p.Tags == nil || p.Values == nil || len(p.Values) == 0 {
|
|
continue
|
|
}
|
|
|
|
// Add a tag to indicate the source of the data.
|
|
p.Tags["url"] = url
|
|
|
|
acc.AddFields(
|
|
p.Name,
|
|
p.Values,
|
|
p.Tags,
|
|
)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func init() {
|
|
plugins.Add("influxdb", func() plugins.Plugin {
|
|
return &InfluxDB{}
|
|
})
|
|
}
|