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config.go
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config.go
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// Copyright The OpenTelemetry Authors
//
// Licensed 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 elasticsearchreceiver // import "github.com/open-telemetry/opentelemetry-collector-contrib/receiver/elasticsearchreceiver"
import (
"errors"
"fmt"
"net/url"
"go.opentelemetry.io/collector/config/confighttp"
"go.opentelemetry.io/collector/receiver/scraperhelper"
"go.uber.org/multierr"
"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/elasticsearchreceiver/internal/metadata"
)
var (
defaultEndpoint = "http://localhost:9200"
)
var (
errEndpointBadScheme = errors.New("endpoint scheme must be http or https")
errUsernameNotSpecified = errors.New("password was specified, but not username")
errPasswordNotSpecified = errors.New("username was specified, but not password")
errEmptyEndpoint = errors.New("endpoint must be specified")
)
// Config is the configuration for the elasticsearch receiver
type Config struct {
scraperhelper.ScraperControllerSettings `mapstructure:",squash"`
confighttp.HTTPClientSettings `mapstructure:",squash"`
// Metrics defines which metrics to enable for the scraper
Metrics metadata.MetricsSettings `mapstructure:"metrics"`
// Nodes defines the nodes to scrape.
// See https://www.elastic.co/guide/en/elasticsearch/reference/7.9/cluster.html#cluster-nodes for which selectors may be used here.
// If Nodes is empty, no nodes will be scraped.
Nodes []string `mapstructure:"nodes"`
// SkipClusterMetrics indicates whether cluster level metrics from /_cluster/health should be scraped or not.
SkipClusterMetrics bool `mapstructure:"skip_cluster_metrics"`
// Username is the username used when making REST calls to elasticsearch. Must be specified if Password is. Not required.
Username string `mapstructure:"username"`
// Password is the password used when making REST calls to elasticsearch. Must be specified if Username is. Not required.
Password string `mapstructure:"password"`
}
// Validate validates the given config, returning an error specifying any issues with the config.
func (cfg *Config) Validate() error {
var combinedErr error
if err := invalidCredentials(cfg.Username, cfg.Password); err != nil {
combinedErr = multierr.Append(combinedErr, err)
}
if cfg.Endpoint == "" {
return multierr.Append(combinedErr, errEmptyEndpoint)
}
u, err := url.Parse(cfg.Endpoint)
if err != nil {
return multierr.Append(
combinedErr,
fmt.Errorf("invalid endpoint '%s': %w", cfg.Endpoint, err),
)
}
switch u.Scheme {
case "http", "https": // ok
default:
return multierr.Append(combinedErr, errEndpointBadScheme)
}
return combinedErr
}
// invalidCredentials returns true if only one username or password is not empty.
func invalidCredentials(username, password string) error {
if username == "" && password != "" {
return errUsernameNotSpecified
}
if password == "" && username != "" {
return errPasswordNotSpecified
}
return nil
}