forked from benthosdev/benthos
/
input_websocket.go
217 lines (189 loc) · 5.58 KB
/
input_websocket.go
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package io
import (
"context"
"crypto/tls"
"fmt"
"net/http"
"net/url"
"sync"
"github.com/gorilla/websocket"
"github.com/nehal119/benthos-119/pkg/bundle"
"github.com/nehal119/benthos-119/pkg/component"
"github.com/nehal119/benthos-119/pkg/component/input"
"github.com/nehal119/benthos-119/pkg/component/input/config"
"github.com/nehal119/benthos-119/pkg/component/interop"
"github.com/nehal119/benthos-119/pkg/httpclient"
"github.com/nehal119/benthos-119/pkg/log"
"github.com/nehal119/benthos-119/pkg/message"
"github.com/nehal119/benthos-119/public/service"
)
type wsOpenMsgType string
const (
// wsOpenMsgTypeBinary sets the type of open_message to binary.
wsOpenMsgTypeBinary wsOpenMsgType = "binary"
// wsOpenMsgTypeText sets the type of open_message to text (UTF-8 encoded text data).
wsOpenMsgTypeText wsOpenMsgType = "text"
)
func websocketInputSpec() *service.ConfigSpec {
return service.NewConfigSpec().
Stable().
Categories("Network").
Summary("Connects to a websocket server and continuously receives messages.").
Description(`It is possible to configure an `+"`open_message`"+`, which when set to a non-empty string will be sent to the websocket server each time a connection is first established.`).
Fields(
service.NewURLField("url").
Description("The URL to connect to.").
Example("ws://localhost:4195/get/ws"),
service.NewStringField("open_message").
Description("An optional message to send to the server upon connection.").
Advanced().Optional(),
service.NewStringAnnotatedEnumField("open_message_type", map[string]string{
string(wsOpenMsgTypeBinary): "Binary data open_message.",
string(wsOpenMsgTypeText): "Text data open_message. The text message payload is interpreted as UTF-8 encoded text data.",
}).Description("An optional flag to indicate the data type of open_message.").
Advanced().Default(string(wsOpenMsgTypeBinary)),
service.NewTLSToggledField("tls"),
).
Fields(config.AsyncOptsFields()...).
Fields(httpclient.AuthFieldSpecs()...)
}
func init() {
err := service.RegisterBatchInput(
"websocket", websocketInputSpec(),
func(conf *service.ParsedConfig, mgr *service.Resources) (in service.BatchInput, err error) {
oldMgr := interop.UnwrapManagement(mgr)
var r *websocketReader
if r, err = newWebsocketReaderFromParsed(conf, oldMgr); err != nil {
return
}
var opts []func(*input.AsyncReader)
if opts, err = config.AsyncOptsFromParsed(conf); err != nil {
return
}
var i input.Streamed
if i, err = input.NewAsyncReader("websocket", input.NewAsyncPreserver(r), oldMgr, opts...); err != nil {
return
}
in = interop.NewUnwrapInternalInput(i)
return
})
if err != nil {
panic(err)
}
}
type websocketReader struct {
log log.Modular
mgr bundle.NewManagement
lock *sync.Mutex
client *websocket.Conn
urlParsed *url.URL
urlStr string
tlsEnabled bool
tlsConf *tls.Config
reqSigner httpclient.RequestSigner
openMsgType wsOpenMsgType
openMsg []byte
}
func newWebsocketReaderFromParsed(conf *service.ParsedConfig, mgr bundle.NewManagement) (*websocketReader, error) {
ws := &websocketReader{
log: mgr.Logger(),
mgr: mgr,
lock: &sync.Mutex{},
}
var err error
if ws.urlParsed, err = conf.FieldURL("url"); err != nil {
return nil, err
}
if ws.urlStr, err = conf.FieldString("url"); err != nil {
return nil, err
}
if ws.tlsConf, ws.tlsEnabled, err = conf.FieldTLSToggled("tls"); err != nil {
return nil, err
}
if ws.reqSigner, err = httpclient.AuthSignerFromParsed(conf); err != nil {
return nil, err
}
var openMsgStr, openMsgTypeStr string
if openMsgTypeStr, err = conf.FieldString("open_message_type"); err != nil {
return nil, err
}
ws.openMsgType = wsOpenMsgType(openMsgTypeStr)
if openMsgStr, _ = conf.FieldString("open_message"); openMsgStr != "" {
ws.openMsg = []byte(openMsgStr)
}
return ws, nil
}
func (w *websocketReader) getWS() *websocket.Conn {
w.lock.Lock()
ws := w.client
w.lock.Unlock()
return ws
}
func (w *websocketReader) Connect(ctx context.Context) error {
w.lock.Lock()
defer w.lock.Unlock()
if w.client != nil {
return nil
}
headers := http.Header{}
err := w.reqSigner(w.mgr.FS(), &http.Request{
URL: w.urlParsed,
Header: headers,
})
if err != nil {
return err
}
var client *websocket.Conn
if w.tlsEnabled {
dialer := websocket.Dialer{
TLSClientConfig: w.tlsConf,
}
if client, _, err = dialer.Dial(w.urlStr, headers); err != nil {
return err
}
} else if client, _, err = websocket.DefaultDialer.Dial(w.urlStr, headers); err != nil {
return err
}
var openMsgType int
switch w.openMsgType {
case wsOpenMsgTypeBinary:
openMsgType = websocket.BinaryMessage
case wsOpenMsgTypeText:
openMsgType = websocket.TextMessage
default:
return fmt.Errorf("unrecognised open_message_type: %s", w.openMsgType)
}
if len(w.openMsg) > 0 {
if err := client.WriteMessage(openMsgType, w.openMsg); err != nil {
return err
}
}
w.client = client
return nil
}
func (w *websocketReader) ReadBatch(ctx context.Context) (message.Batch, input.AsyncAckFn, error) {
client := w.getWS()
if client == nil {
return nil, nil, component.ErrNotConnected
}
_, data, err := client.ReadMessage()
if err != nil {
w.lock.Lock()
w.client = nil
w.lock.Unlock()
err = component.ErrNotConnected
return nil, nil, err
}
return message.QuickBatch([][]byte{data}), func(ctx context.Context, err error) error {
return nil
}, nil
}
func (w *websocketReader) Close(ctx context.Context) (err error) {
w.lock.Lock()
defer w.lock.Unlock()
if w.client != nil {
err = w.client.Close()
w.client = nil
}
return
}