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// SPDX-License-Identifier: GPL-3.0-or-later
package netdataapi
import (
"bytes"
"fmt"
"io"
"strconv"
)
type (
// API implements Netdata external plugins API.
// https://learn.netdata.cloud/docs/agent/plugins.d#the-output-of-the-plugin
API struct {
io.Writer
}
)
const quotes = "' '"
var (
end = []byte("END\n\n")
clabelCommit = []byte("CLABEL_COMMIT\n")
newLine = []byte("\n")
)
func New(w io.Writer) *API { return &API{w} }
// CHART creates or update a chart.
func (a *API) CHART(
typeID string,
ID string,
name string,
title string,
units string,
family string,
context string,
chartType string,
priority int,
updateEvery int,
options string,
plugin string,
module string) error {
_, err := a.Write([]byte("CHART " + "'" +
typeID + "." + ID + quotes +
name + quotes +
title + quotes +
units + quotes +
family + quotes +
context + quotes +
chartType + quotes +
strconv.Itoa(priority) + quotes +
strconv.Itoa(updateEvery) + quotes +
options + quotes +
plugin + quotes +
module + "'\n"))
return err
}
// DIMENSION adds or update a dimension to the chart just created.
func (a *API) DIMENSION(
ID string,
name string,
algorithm string,
multiplier int,
divisor int,
options string) error {
_, err := a.Write([]byte("DIMENSION '" +
ID + quotes +
name + quotes +
algorithm + quotes +
strconv.Itoa(multiplier) + quotes +
strconv.Itoa(divisor) + quotes +
options + "'\n"))
return err
}
// CLABEL adds or update a label to the chart.
func (a *API) CLABEL(key, value string, source int) error {
_, err := a.Write([]byte("CLABEL '" +
key + quotes +
value + quotes +
strconv.Itoa(source) + "'\n"))
return err
}
// CLABELCOMMIT adds labels to the chart. Should be called after one or more CLABEL.
func (a *API) CLABELCOMMIT() error {
_, err := a.Write(clabelCommit)
return err
}
// BEGIN initializes data collection for a chart.
func (a *API) BEGIN(typeID string, ID string, msSince int) (err error) {
if msSince > 0 {
_, err = a.Write([]byte("BEGIN " + "'" + typeID + "." + ID + "' " + strconv.Itoa(msSince) + "\n"))
} else {
_, err = a.Write([]byte("BEGIN " + "'" + typeID + "." + ID + "'\n"))
}
return err
}
// SET sets the value of a dimension for the initialized chart.
func (a *API) SET(ID string, value int64) error {
_, err := a.Write([]byte("SET '" + ID + "' = " + strconv.FormatInt(value, 10) + "\n"))
return err
}
// SETEMPTY sets the empty value of a dimension for the initialized chart.
func (a *API) SETEMPTY(ID string) error {
_, err := a.Write([]byte("SET '" + ID + "' = \n"))
return err
}
// VARIABLE sets the value of a CHART scope variable for the initialized chart.
func (a *API) VARIABLE(ID string, value int64) error {
_, err := a.Write([]byte("VARIABLE CHART '" + ID + "' = " + strconv.FormatInt(value, 10) + "\n"))
return err
}
// END completes data collection for the initialized chart.
func (a *API) END() error {
_, err := a.Write(end)
return err
}
// DISABLE disables this plugin. This will prevent Netdata from restarting the plugin.
func (a *API) DISABLE() error {
_, err := a.Write([]byte("DISABLE\n"))
return err
}
// EMPTYLINE writes an empty line.
func (a *API) EMPTYLINE() error {
_, err := a.Write(newLine)
return err
}
func (a *API) HOSTINFO(guid, hostname string, labels map[string]string) error {
if err := a.HOSTDEFINE(guid, hostname); err != nil {
return err
}
for k, v := range labels {
if err := a.HOSTLABEL(k, v); err != nil {
return err
}
}
return a.HOSTDEFINEEND()
}
func (a *API) HOSTDEFINE(guid, hostname string) error {
_, err := fmt.Fprintf(a, "HOST_DEFINE '%s' '%s'\n", guid, hostname)
return err
}
func (a *API) HOSTLABEL(name, value string) error {
_, err := fmt.Fprintf(a, "HOST_LABEL '%s' '%s'\n", name, value)
return err
}
func (a *API) HOSTDEFINEEND() error {
_, err := fmt.Fprintf(a, "HOST_DEFINE_END\n\n")
return err
}
func (a *API) HOST(guid string) error {
_, err := a.Write([]byte("HOST " + "'" +
guid + "'\n\n"))
return err
}
func (a *API) FUNCRESULT(uid, contentType, payload, code, expireTimestamp string) {
var buf bytes.Buffer
buf.WriteString("FUNCTION_RESULT_BEGIN " +
uid + " " +
code + " " +
contentType + " " +
expireTimestamp + "\n",
)
if payload != "" {
buf.WriteString(payload + "\n")
}
buf.WriteString("FUNCTION_RESULT_END\n\n")
_, _ = buf.WriteTo(a)
}
func (a *API) CONFIGCREATE(id, status, configType, path, sourceType, source, supportedCommands string) {
// https://learn.netdata.cloud/docs/contributing/external-plugins/#config
_, _ = a.Write([]byte("CONFIG " +
id + " " +
"create" + " " +
status + " " +
configType + " " +
path + " " +
sourceType + " '" +
source + "' '" +
supportedCommands + "' 0x0000 0x0000\n\n",
))
}
func (a *API) CONFIGDELETE(id string) {
_, _ = a.Write([]byte("CONFIG " + id + " delete\n\n"))
}
func (a *API) CONFIGSTATUS(id, status string) {
_, _ = a.Write([]byte("CONFIG " + id + " status " + status + "\n\n"))
}
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