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Merge pull request #135 from getAlby/feature/event-stream
Feature/event-stream
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,150 @@ | ||
| package controllers | ||
|
|
||
| import ( | ||
| "net/http" | ||
| "time" | ||
|
|
||
| "github.com/getAlby/lndhub.go/common" | ||
| "github.com/getAlby/lndhub.go/db/models" | ||
| "github.com/getAlby/lndhub.go/lib/service" | ||
| "github.com/getAlby/lndhub.go/lib/tokens" | ||
| "github.com/gorilla/websocket" | ||
| "github.com/labstack/echo/v4" | ||
| ) | ||
|
|
||
| // GetTXSController : GetTXSController struct | ||
| type InvoiceStreamController struct { | ||
| svc *service.LndhubService | ||
| } | ||
|
|
||
| type InvoiceEventWrapper struct { | ||
| Type string `json:"type"` | ||
| Invoice *IncomingInvoice `json:"invoice,omitempty"` | ||
| } | ||
|
|
||
| func NewInvoiceStreamController(svc *service.LndhubService) *InvoiceStreamController { | ||
| return &InvoiceStreamController{svc: svc} | ||
| } | ||
|
|
||
| // Stream invoices streams incoming payments to the client | ||
| func (controller *InvoiceStreamController) StreamInvoices(c echo.Context) error { | ||
| userId, err := tokens.ParseToken(controller.svc.Config.JWTSecret, (c.QueryParam("token")), false) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| invoiceChan := make(chan models.Invoice) | ||
| ticker := time.NewTicker(30 * time.Second) | ||
| ws, done, err := createWebsocketUpgrader(c) | ||
| defer ws.Close() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| //start subscription | ||
| subId := controller.svc.InvoicePubSub.Subscribe(userId, invoiceChan) | ||
|
|
||
| //start with keepalive message | ||
| err = ws.WriteJSON(&InvoiceEventWrapper{Type: "keepalive"}) | ||
| if err != nil { | ||
| controller.svc.Logger.Error(err) | ||
| controller.svc.InvoicePubSub.Unsubscribe(subId, userId) | ||
| return err | ||
| } | ||
| fromPaymentHash := c.QueryParam("since_payment_hash") | ||
| if fromPaymentHash != "" { | ||
| err = controller.writeMissingInvoices(c, userId, ws, fromPaymentHash) | ||
| if err != nil { | ||
| controller.svc.Logger.Error(err) | ||
| controller.svc.InvoicePubSub.Unsubscribe(subId, userId) | ||
| return err | ||
| } | ||
| } | ||
| SocketLoop: | ||
| for { | ||
| select { | ||
| case <-done: | ||
| break SocketLoop | ||
| case <-ticker.C: | ||
| err := ws.WriteJSON(&InvoiceEventWrapper{Type: "keepalive"}) | ||
| if err != nil { | ||
| controller.svc.Logger.Error(err) | ||
| break SocketLoop | ||
| } | ||
| case invoice := <-invoiceChan: | ||
| err := ws.WriteJSON( | ||
| &InvoiceEventWrapper{ | ||
| Type: "invoice", | ||
| Invoice: &IncomingInvoice{ | ||
| PaymentHash: invoice.RHash, | ||
| PaymentRequest: invoice.PaymentRequest, | ||
| Description: invoice.Memo, | ||
| PayReq: invoice.PaymentRequest, | ||
| Timestamp: invoice.CreatedAt.Unix(), | ||
| Type: common.InvoiceTypeUser, | ||
| Amount: invoice.Amount, | ||
| IsPaid: invoice.State == common.InvoiceStateSettled, | ||
| }}) | ||
| if err != nil { | ||
| controller.svc.Logger.Error(err) | ||
| break SocketLoop | ||
| } | ||
| } | ||
| } | ||
| controller.svc.InvoicePubSub.Unsubscribe(subId, userId) | ||
| return nil | ||
| } | ||
|
|
||
| //open the websocket and start listening for close messages in a goroutine | ||
| func createWebsocketUpgrader(c echo.Context) (conn *websocket.Conn, done chan struct{}, err error) { | ||
| upgrader := websocket.Upgrader{} | ||
| upgrader.CheckOrigin = func(r *http.Request) bool { return true } | ||
| ws, err := upgrader.Upgrade(c.Response(), c.Request(), nil) | ||
| if err != nil { | ||
| return nil, nil, err | ||
| } | ||
|
|
||
| //start listening for close messages | ||
| done = make(chan struct{}) | ||
| go func() { | ||
| defer close(done) | ||
| for { | ||
| _, _, err := ws.ReadMessage() | ||
| if err != nil { | ||
| return | ||
| } | ||
| } | ||
| }() | ||
| return ws, done, nil | ||
| } | ||
|
|
||
| func (controller *InvoiceStreamController) writeMissingInvoices(c echo.Context, userId int64, ws *websocket.Conn, hash string) error { | ||
| invoices, err := controller.svc.InvoicesFor(c.Request().Context(), userId, common.InvoiceTypeIncoming) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| for _, inv := range invoices { | ||
| //invoices are order from newest to oldest (with a maximum of 100 invoices being returned) | ||
| //so if we get a match on the hash, we have processed all missing invoices for this client | ||
| if inv.RHash == hash { | ||
| break | ||
| } | ||
| if inv.State == common.InvoiceStateSettled { | ||
| err := ws.WriteJSON( | ||
| &InvoiceEventWrapper{ | ||
| Type: "invoice", | ||
| Invoice: &IncomingInvoice{ | ||
| PaymentHash: inv.RHash, | ||
| PaymentRequest: inv.PaymentRequest, | ||
| Description: inv.Memo, | ||
| PayReq: inv.PaymentRequest, | ||
| Timestamp: inv.CreatedAt.Unix(), | ||
| Type: common.InvoiceTypeUser, | ||
| Amount: inv.Amount, | ||
| IsPaid: inv.State == common.InvoiceStateSettled, | ||
| }}) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| } | ||
| return nil | ||
| } |
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