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beat.go
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/
beat.go
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// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package beat
import (
"encoding/json"
"fmt"
"net/url"
"github.com/pkg/errors"
"github.com/elastic/beats/libbeat/common"
"github.com/elastic/beats/metricbeat/helper"
"github.com/elastic/beats/metricbeat/mb"
)
func init() {
// Register the ModuleFactory function for this module.
if err := mb.Registry.AddModule(ModuleName, NewModule); err != nil {
panic(err)
}
}
// NewModule creates a new module after performing validation.
func NewModule(base mb.BaseModule) (mb.Module, error) {
if err := validateXPackMetricsets(base); err != nil {
return nil, err
}
return &base, nil
}
// Validate that correct metricsets have been specified if xpack.enabled = true.
func validateXPackMetricsets(base mb.BaseModule) error {
config := struct {
Metricsets []string `config:"metricsets"`
XPackEnabled bool `config:"xpack.enabled"`
}{}
if err := base.UnpackConfig(&config); err != nil {
return err
}
// Nothing to validate if xpack.enabled != true
if !config.XPackEnabled {
return nil
}
expectedXPackMetricsets := []string{
"state",
"stats",
}
if !common.MakeStringSet(config.Metricsets...).Equals(common.MakeStringSet(expectedXPackMetricsets...)) {
return errors.Errorf("The %v module with xpack.enabled: true must have metricsets: %v", ModuleName, expectedXPackMetricsets)
}
return nil
}
// ModuleName is the name of this module.
const ModuleName = "beat"
var (
// ErrClusterUUID is the error to be returned when the monitored beat is using the Elasticsearch output but hasn't
// yet connected or is having trouble connecting to that Elasticsearch, so the cluster UUID cannot be
// determined
ErrClusterUUID = fmt.Errorf("monitored beat is using Elasticsearch output but cluster UUID cannot be determined")
)
// Info construct contains the relevant data from the Beat's / endpoint
type Info struct {
UUID string `json:"uuid"`
Beat string `json:"beat"`
Name string `json:"name"`
Hostname string `json:"hostname"`
Version string `json:"version"`
}
// State construct contains the relevant data from the Beat's /state endpoint
type State struct {
Monitoring struct {
ClusterUUID string `json:"cluster_uuid"`
} `json:"monitoring"`
Output struct {
Name string `json:"name"`
} `json:"output"`
Outputs struct {
Elasticsearch struct {
ClusterUUID string `json:"cluster_uuid"`
} `json:"elasticsearch"`
} `json:"outputs"`
}
// GetInfo returns the data for the Beat's / endpoint.
func GetInfo(m *MetricSet) (*Info, error) {
content, err := fetchPath(m.HTTP, "/", "")
if err != nil {
return nil, err
}
info := &Info{}
err = json.Unmarshal(content, &info)
if err != nil {
return nil, err
}
return info, nil
}
// GetState returns the data for the Beat's /state endpoint.
func GetState(m *MetricSet) (*State, error) {
content, err := fetchPath(m.HTTP, "/state", "")
if err != nil {
return nil, err
}
info := &State{}
err = json.Unmarshal(content, &info)
if err != nil {
return nil, err
}
return info, nil
}
func fetchPath(httpHelper *helper.HTTP, path string, query string) ([]byte, error) {
currentURI := httpHelper.GetURI()
defer httpHelper.SetURI(currentURI)
// Parses the uri to replace the path
u, _ := url.Parse(currentURI)
u.Path = path
u.RawQuery = query
// Http helper includes the HostData with username and password
httpHelper.SetURI(u.String())
return httpHelper.FetchContent()
}