Working lnd grpc with invoice polling
Chakib Benziane
5 years ago
parent
23abc0b369
commit
fd7cec6600
@ -1,77 +0,0 @@
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package lndrpc
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import (
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"io"
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"log"
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"git.sp4ke.com/sp4ke/bit4sat/db"
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lnrpc "github.com/lightningnetwork/lnd/lnrpc"
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"github.com/mediocregopher/radix/v3"
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"golang.org/x/net/context"
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)
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const (
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LastSettledInvoiceIndexKey = "last_invoice_settled_index_cursor"
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)
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// Last watched invoice
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func getLastSettledInvoiceIndex() uint64 {
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var cursor uint64
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err := db.DB.Redis.Do(radix.FlatCmd(&cursor, "GET", LastSettledInvoiceIndexKey))
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if err != nil {
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log.Fatal(err)
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}
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return cursor
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}
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func setLastSettledInvoiceIndex(index uint64) {
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err := db.DB.Redis.Do(radix.FlatCmd(nil, "SET", LastSettledInvoiceIndexKey, index))
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if err != nil {
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log.Fatal(err)
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}
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}
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// Runs in a goroutine and keep swatching invoices
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func WatchInvoice(settleIndex uint64) {
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// Get the last invoice index cursor
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cursor := getLastSettledInvoiceIndex()
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log.Println(cursor)
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ctxb := context.Background()
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client, cleanUp := getClient()
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defer cleanUp()
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subscription := &lnrpc.InvoiceSubscription{}
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invoiceStream, err := client.SubscribeInvoices(ctxb, subscription)
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if err != nil {
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//return nil, err
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}
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for {
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invoice, err := invoiceStream.Recv()
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if err == io.EOF {
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break
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}
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if err != nil {
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log.Printf("error invoice stream %s", err)
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break
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}
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log.Printf("Received invoice \n%s\n", invoice)
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// We are only interested in settled invoices
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if !invoice.Settled {
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continue
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}
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// Invoice was settled we need to save it and also notify the pubsub channel
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// Save last settled index
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setLastSettledInvoiceIndex(invoice.SettleIndex)
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}
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}
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@ -1,14 +1,18 @@
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package main
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import "git.sp4ke.com/sp4ke/bit4sat/lndrpc"
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import (
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"git.sp4ke.com/sp4ke/bit4sat/api"
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"git.sp4ke.com/sp4ke/bit4sat/db"
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"git.sp4ke.com/sp4ke/bit4sat/watchers"
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)
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func main() {
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go lndrpc.WatchInvoice(0)
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<-make(chan bool)
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go watchers.WatchInvoice()
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//<-make(chan bool)
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//defer db.DB.Sql.Close()
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defer db.DB.Sql.Close()
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//api := api.NewAPI()
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//api.Run()
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api := api.NewAPI()
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api.Run()
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}
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@ -0,0 +1,164 @@
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package watchers
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import (
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"encoding/hex"
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"encoding/json"
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"fmt"
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"io"
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"log"
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"time"
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"git.sp4ke.com/sp4ke/bit4sat/bus"
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"git.sp4ke.com/sp4ke/bit4sat/db"
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"git.sp4ke.com/sp4ke/bit4sat/ln"
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"git.sp4ke.com/sp4ke/bit4sat/lndrpc"
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"git.sp4ke.com/sp4ke/bit4sat/storage"
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lnrpc "github.com/lightningnetwork/lnd/lnrpc"
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"github.com/mediocregopher/radix/v3"
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"golang.org/x/net/context"
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)
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const (
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LastSettledInvoiceIndexKey = "last_invoice_settled_index_cursor"
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)
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// Last watched invoice
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func getLastSettledInvoiceIndex() uint64 {
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var cursor uint64
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err := db.DB.Redis.Do(radix.FlatCmd(&cursor, "GET", LastSettledInvoiceIndexKey))
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if err != nil {
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log.Fatal(err)
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}
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return cursor
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}
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func setLastSettledInvoiceIndex(index uint64) {
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err := db.DB.Redis.Do(radix.FlatCmd(nil, "SET", LastSettledInvoiceIndexKey, index))
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if err != nil {
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log.Fatal(err)
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}
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}
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// Runs in a goroutine and keep swatching invoices
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func WatchInvoice() {
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// Get the last invoice index cursor
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cursor := getLastSettledInvoiceIndex()
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log.Println(cursor)
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ctxb := context.Background()
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client, cleanUp := lndrpc.GetClient()
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defer cleanUp()
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subscription := &lnrpc.InvoiceSubscription{}
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invoiceStream, err := client.SubscribeInvoices(ctxb, subscription)
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if err != nil {
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//return nil, err
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}
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for {
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invoice, err := invoiceStream.Recv()
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if err == io.EOF {
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break
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}
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if err != nil {
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log.Printf("error invoice stream %s", err)
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break
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}
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log.Printf("Received invoice \n%s\n", invoice)
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// We are only interested in settled invoices
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if !invoice.Settled {
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continue
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}
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// Invoice expired
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if expiredInvoice(invoice.CreationDate, invoice.Expiry) {
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handleExpiredInvoice(invoice)
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}
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// Invoice was paid, we handle it
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handleSettledInvoice(invoice)
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}
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}
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//TODO
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func handleExpiredInvoice(invoice *lnrpc.Invoice) {
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// Update upload status to "expired"
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uploadId, err := storage.GetUploadIdForInvoice(hex.EncodeToString(invoice.RHash))
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if err != nil {
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log.Fatal(fmt.Errorf("handleExpiredInvoice: %s", err))
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}
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err = storage.SetUploadStatus(uploadId, storage.UpPayExpired)
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if err != nil {
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log.Fatal(fmt.Errorf("handleExpiredInvoice %s", err))
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}
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// No need to store the invoice
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// TODO
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// TODO: flush all invoices and uploads
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// TODO
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}
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func expiredInvoice(creation, expiry int64) bool {
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createdAt := time.Unix(int64(creation), 0)
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expiresAt := createdAt.Add(time.Second * time.Duration(expiry))
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return time.Now().After(expiresAt)
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}
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func handleSettledInvoice(invoice *lnrpc.Invoice) {
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// we need to save it and also notify the pubsub channel
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// Save last settled index
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setLastSettledInvoiceIndex(invoice.SettleIndex)
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// Update upload status to "paid"
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uploadId, err := storage.GetUploadIdForInvoice(hex.EncodeToString(invoice.RHash))
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if err != nil {
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log.Fatal(fmt.Errorf("handleSettledInvoice: %s", err))
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}
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err = storage.SetUploadStatus(uploadId, storage.UpPaid)
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if err != nil {
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log.Fatal(fmt.Errorf("handleSettledInvoice: %s", err))
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}
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// Get stored invoice for upload
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storedInvoice, err := storage.GetUploadInvoice(uploadId)
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if err != nil {
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log.Fatal(fmt.Errorf("handleSettledInvoice: %s", err))
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}
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// Update stored invoice fields
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newInvoice := ln.UpdateInvoiceFromLnd(storedInvoice, invoice)
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// Set invoice for upload
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err = storage.SetUploadInvoice(uploadId, newInvoice)
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if err != nil {
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log.Fatal(fmt.Errorf("handleSettledInvoice: %s", err))
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}
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newInvoiceJson, err := json.Marshal(newInvoice)
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if err != nil {
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log.Fatal(fmt.Errorf("handleSettledInvoice: %s", err))
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}
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// publish invoice was updated to upload_id_paid channel
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log.Printf("Notifying invoice paid %s", uploadId)
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key := fmt.Sprintf("%s_%s", bus.InvoicePaidChannelPrefix,
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newInvoice.RHash)
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err = db.DB.Redis.Do(radix.FlatCmd(nil, "PUBLISH",
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key, newInvoiceJson))
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}
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