connector.go

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// 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 channel

import (
	"github.com/elastic/beats/v7/libbeat/beat"
	"github.com/elastic/beats/v7/libbeat/common"
)

// ConnectorFunc is an adapter for using ordinary functions as Connector.
type ConnectorFunc func(*common.Config, beat.ClientConfig) (Outleter, error)

type pipelineConnector struct {
	parent   *OutletFactory
	pipeline beat.PipelineConnector
}

// Connect passes the cfg and the zero value of beat.ClientConfig to the underlying function.
func (fn ConnectorFunc) Connect(cfg *common.Config) (Outleter, error) {
	return fn(cfg, beat.ClientConfig{})
}

// ConnectWith passes the configuration and the pipeline connection setting to the underlying function.
func (fn ConnectorFunc) ConnectWith(cfg *common.Config, clientCfg beat.ClientConfig) (Outleter, error) {
	return fn(cfg, clientCfg)
}

func (c *pipelineConnector) Connect(cfg *common.Config) (Outleter, error) {
	return c.ConnectWith(cfg, beat.ClientConfig{})
}

func (c *pipelineConnector) ConnectWith(cfg *common.Config, clientCfg beat.ClientConfig) (Outleter, error) {
	// connect with updated configuration
	client, err := c.pipeline.ConnectWith(clientCfg)
	if err != nil {
		return nil, err
	}

	outlet := newOutlet(client)
	if c.parent.done != nil {
		return CloseOnSignal(outlet, c.parent.done), nil
	}
	return outlet, nil
}