From 2aa00e47d09d6b3aa29550754d95e37d13402a4e Mon Sep 17 00:00:00 2001
From: Shelly Wei <guaichen07@gmail.com>
Date: Wed, 27 Nov 2019 13:28:01 -0800
Subject: [PATCH] move sample/demo from go-btfs to go-btfs-common

---
 ledger/sample/demo.go | 98 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 ledger/sample/demo.go

diff --git a/ledger/sample/demo.go b/ledger/sample/demo.go
new file mode 100644
index 0000000..a6e24de
--- /dev/null
+++ b/ledger/sample/demo.go
@@ -0,0 +1,98 @@
+package main
+
+import (
+	"context"
+	"encoding/base64"
+	"github.com/tron-us/go-btfs-common/ledger"
+	"log"
+
+	ic "github.com/libp2p/go-libp2p-core/crypto"
+)
+
+const (
+	PayerPrivKeyString    = "CAISIJFNZZd5ZSvi9OlJP/mz/vvUobvlrr2//QN4DzX/EShP"
+	ReceiverPrivKeyString = "CAISIDm/qF5f98Jh8FGBUcFUhQvJPU8uEah1SZrR1BrGekC0"
+)
+
+func main() {
+	ctx := context.Background()
+	// build connection with ledger
+	clientConn, err := ledger.LedgerConnection("ledger-dev.bt.co:443", "")
+	if err != nil {
+		log.Panic("fail to connect", err)
+	}
+	defer ledger.CloseConnection(clientConn)
+	// new ledger client
+	ledgerClient := ledger.NewClient(clientConn)
+	// create payer Account
+	payerPrivKey, err := convertToPrivKey(PayerPrivKeyString)
+	if err != nil {
+		log.Panic(err)
+	}
+	payerPubKey := payerPrivKey.GetPublic()
+	//_, err = ledger.ImportAccount(ctx, payerPubKey, ledgerClient)
+	_, err = ledger.ImportSignedAccount(ctx, payerPrivKey, payerPubKey, ledgerClient)
+	if err != nil {
+		log.Panic(err)
+	}
+	// create receiver account
+	recvPrivKey, err := convertToPrivKey(ReceiverPrivKeyString)
+	if err != nil {
+		log.Panic(err)
+	}
+	recvPubKey := recvPrivKey.GetPublic()
+	//_, err = ledger.ImportAccount(ctx, recvPubKey, ledgerClient)
+	_, err = ledger.ImportSignedAccount(ctx, recvPrivKey, recvPubKey, ledgerClient)
+	if err != nil {
+		log.Panic(err)
+	}
+	// prepare channel commit
+	amount := int64(1)
+	channelCommit, err := ledger.NewChannelCommit(payerPubKey, recvPubKey, amount)
+	if err != nil {
+		log.Panic(err)
+	}
+	// sign for the channel commit
+	fromSig, err := ledger.Sign(payerPrivKey, channelCommit)
+	if err != nil {
+		log.Panic("fail to sign channel commit", err)
+	}
+	// create channel: payer start the channel
+	channelID, err := ledger.CreateChannel(ctx, ledgerClient, channelCommit, fromSig)
+	if err != nil {
+		log.Panic("fail to create channel", err)
+	}
+	// channel state: transfer money from -> to
+	fromAcc, err := ledger.NewAccount(payerPubKey, 0)
+	if err != nil {
+		log.Panic(err)
+	}
+	toAcc, err := ledger.NewAccount(recvPubKey, amount)
+	if err != nil {
+		log.Panic(err)
+	}
+	channelState := ledger.NewChannelState(channelID, 1, fromAcc, toAcc)
+	// need permission from both account, get signature from both
+	fromSigState, err := ledger.Sign(payerPrivKey, channelState)
+	if err != nil {
+		log.Panic("error when signing the channel state", err)
+	}
+	toSigState, err := ledger.Sign(recvPrivKey, channelState)
+	if err != nil {
+		log.Panic("error when signing the channel state", err)
+	}
+	signedChannelState := ledger.NewSignedChannelState(channelState, fromSigState, toSigState)
+	// close channel
+	err = ledger.CloseChannel(ctx, signedChannelState)
+	if err != nil {
+		log.Panic("fail to close channel", err)
+	}
+}
+
+func convertToPrivKey(key string) (ic.PrivKey, error) {
+	raw, err := base64.StdEncoding.DecodeString(key)
+	if err != nil {
+		return nil, err
+	}
+	return ic.UnmarshalPrivateKey(raw)
+}