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websocketutil.go
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websocketutil.go
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// Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License"). You may not
// use this file except in compliance with the License. A copy of the
// License is located at
//
// http://aws.amazon.com/apache2.0/
//
// or in the "license" file accompanying this file. This file 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 websocketutil contains methods for interacting with websocket connections.
package websocketutil
import (
"errors"
"github.com/aws/session-manager-plugin/src/log"
"github.com/gorilla/websocket"
)
// IWebsocketUtil is the interface for the websocketutil.
type IWebsocketUtil interface {
OpenConnection(url string) (*websocket.Conn, error)
CloseConnection(ws websocket.Conn) error
}
// WebsocketUtil struct provides functionality around creating and maintaining websockets.
type WebsocketUtil struct {
dialer *websocket.Dialer
log log.T
}
// NewWebsocketUtil is the factory function for websocketutil.
func NewWebsocketUtil(logger log.T, dialerInput *websocket.Dialer) *WebsocketUtil {
var websocketUtil *WebsocketUtil
if dialerInput == nil {
websocketUtil = &WebsocketUtil{
dialer: websocket.DefaultDialer,
log: logger,
}
} else {
websocketUtil = &WebsocketUtil{
dialer: dialerInput,
log: logger,
}
}
return websocketUtil
}
// OpenConnection opens a websocket connection provided an input url.
func (u *WebsocketUtil) OpenConnection(url string) (*websocket.Conn, error) {
u.log.Infof("Opening websocket connection to: ", url)
conn, _, err := u.dialer.Dial(url, nil)
if err != nil {
u.log.Errorf("Failed to dial websocket: %s", err.Error())
return nil, err
}
u.log.Infof("Successfully opened websocket connection to: ", url)
return conn, err
}
// CloseConnection closes a websocket connection given the Conn object as input.
func (u *WebsocketUtil) CloseConnection(ws *websocket.Conn) error {
if ws == nil {
return errors.New("websocket conn object is nil")
}
u.log.Debugf("Closing websocket connection to:", ws.RemoteAddr().String())
err := ws.Close()
if err != nil {
u.log.Errorf("Failed to close websocket: %s", err.Error())
return err
}
u.log.Debugf("Successfully closed websocket connection to:", ws.RemoteAddr().String())
return nil
}