/
websocket.go
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/
websocket.go
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package writer
import (
"crypto/tls"
"net/http"
"net/url"
"sync"
"time"
"github.com/Jeffail/benthos/v3/lib/log"
"github.com/Jeffail/benthos/v3/lib/metrics"
"github.com/Jeffail/benthos/v3/lib/types"
"github.com/Jeffail/benthos/v3/lib/util/http/auth"
btls "github.com/Jeffail/benthos/v3/lib/util/tls"
"github.com/gorilla/websocket"
)
//------------------------------------------------------------------------------
// WebsocketConfig contains configuration fields for the Websocket output type.
type WebsocketConfig struct {
URL string `json:"url" yaml:"url"`
auth.Config `json:",inline" yaml:",inline"`
TLS btls.Config `json:"tls" yaml:"tls"`
}
// NewWebsocketConfig creates a new WebsocketConfig with default values.
func NewWebsocketConfig() WebsocketConfig {
return WebsocketConfig{
URL: "ws://localhost:4195/post/ws",
Config: auth.NewConfig(),
TLS: btls.NewConfig(),
}
}
//------------------------------------------------------------------------------
// Websocket is an output type that serves Websocket messages.
type Websocket struct {
log log.Modular
stats metrics.Type
lock *sync.Mutex
conf WebsocketConfig
client *websocket.Conn
tlsConf *tls.Config
}
// NewWebsocket creates a new Websocket output type.
func NewWebsocket(
conf WebsocketConfig,
log log.Modular,
stats metrics.Type,
) (*Websocket, error) {
ws := &Websocket{
log: log,
stats: stats,
lock: &sync.Mutex{},
conf: conf,
}
if conf.TLS.Enabled {
var err error
if ws.tlsConf, err = conf.TLS.Get(); err != nil {
return nil, err
}
}
return ws, nil
}
//------------------------------------------------------------------------------
func (w *Websocket) getWS() *websocket.Conn {
w.lock.Lock()
ws := w.client
w.lock.Unlock()
return ws
}
//------------------------------------------------------------------------------
// Connect establishes a connection to an Websocket server.
func (w *Websocket) Connect() error {
w.lock.Lock()
defer w.lock.Unlock()
if w.client != nil {
return nil
}
headers := http.Header{}
purl, err := url.Parse(w.conf.URL)
if err != nil {
return err
}
if err := w.conf.Sign(&http.Request{
URL: purl,
Header: headers,
}); err != nil {
return err
}
var client *websocket.Conn
if w.conf.TLS.Enabled {
dialer := websocket.Dialer{
TLSClientConfig: w.tlsConf,
}
if client, _, err = dialer.Dial(w.conf.URL, headers); err != nil {
return err
}
} else if client, _, err = websocket.DefaultDialer.Dial(w.conf.URL, headers); err != nil {
return err
}
go func(c *websocket.Conn) {
for {
if _, _, cerr := c.NextReader(); cerr != nil {
c.Close()
break
}
}
}(client)
w.client = client
return nil
}
//------------------------------------------------------------------------------
// Write attempts to write a message by pushing it to an Websocket broker.
func (w *Websocket) Write(msg types.Message) error {
client := w.getWS()
if client == nil {
return types.ErrNotConnected
}
err := msg.Iter(func(i int, p types.Part) error {
return client.WriteMessage(websocket.BinaryMessage, p.Get())
})
if err != nil {
w.lock.Lock()
w.client = nil
w.lock.Unlock()
if err == websocket.ErrCloseSent {
return types.ErrNotConnected
}
return err
}
return nil
}
// CloseAsync shuts down the Websocket output and stops processing messages.
func (w *Websocket) CloseAsync() {
go func() {
w.lock.Lock()
if w.client != nil {
w.client.Close()
w.client = nil
}
w.lock.Unlock()
}()
}
// WaitForClose blocks until the Websocket output has closed down.
func (w *Websocket) WaitForClose(timeout time.Duration) error {
return nil
}
//------------------------------------------------------------------------------