Python Bitcoin tutorial based on Mixin Network: Receive and send Bitcoin in Mixin Messenger

In the previous chapter, we created our first app, when user sends "Hello,world!", the bot reply the same message.

app.py

from mixin_ws_api import MIXIN_WS_API
from mixin_api import MIXIN_API
import mixin_config

import json import time from io import BytesIO import base64 import gzip

try: import thread except ImportError: import _thread as thread

def on_message(ws, message): inbuffer = BytesIO(message)

f = gzip.GzipFile(mode="rb", fileobj=inbuffer)
rdata_injson = f.read()
rdata_obj = json.loads(rdata_injson)
print("-------json object begin---------")
print(rdata_obj)
print("-------json object end---------")
action = rdata_obj["action"]

if rdata_obj["data"] is not None:
    print("data in message:",rdata_obj["data"])

if rdata_obj["data"] is not None and rdata_obj["data"]["category"] is not None:
    print(rdata_obj["data"]["category"])

if action == "CREATE_MESSAGE":

    data = rdata_obj["data"]
    msgid = data["message_id"]
    typeindata = data["type"]
    categoryindata = data["category"]
    userId = data["user_id"]
    conversationId = data["conversation_id"]
    dataindata = data["data"]
    created_at = data["created_at"]
    updated_at = data["updated_at"]

    realData = base64.b64decode(dataindata)

    MIXIN_WS_API.replayMessage(ws, msgid)

    print('userId', userId)
    print("created_at",created_at)

    if categoryindata == "PLAIN_TEXT":
        realData = realData.decode('utf-8')
        print("dataindata",realData)
        MIXIN_WS_API.sendUserText(ws, conversationId, userId, realData)
    elif categoryindata == "SYSTEM_ACCOUNT_SNAPSHOT":
        rdJs = json.loads(realData)
        if ( float(rdJs["amount"]) > 0 ):
            mixin_api.transferTo(userId, rdJs["asset_id"], rdJs["amount"], "")

if name == "main":

mixin_api = MIXIN_API(mixin_config)

mixin_ws = MIXIN_WS_API(on_message=on_message)

mixin_ws.run()

### Hello Bitcoin!
Execute **python app.py** in the project directory.
```bash
cd mixin_labs-python-bot
source ./bin/activate
(mixin_labs-python-bot) wenewzha:mixin_labs-python-bot wenewzhang$ python app.py
ws open
-------json object begin---------
{'id': 'fd6ce766-331a-11e9-92a9-20c9d08850cd', 'action': 'LIST_PENDING_MESSAGES'}
-------json object end---------

Developer can send Bitcoin to their bots in message panel. The bot receive the Bitcoin and then send back immediately.

User can pay 0.001 Bitcoin to bot by click the button and the 0.001 Bitcoin will be refunded in 1 second,In fact, user can pay any coin either.

Source code summary

elif categoryindata == "SYSTEM_ACCOUNT_SNAPSHOT":
    rdJs = json.loads(realData)
    if ( float(rdJs["amount"]) > 0 ):
        mixin_api.transferTo(userId, rdJs["asset_id"], rdJs["amount"], "")

• rdJs["amount"] is negative if bot sends Bitcoin to user successfully.
• rdJs["amount"] is positive if bot receive Bitcoin from user. Call mixin_api.transferTo to refund the coins back to user.

Advanced usage

APP_BUTTON_GROUP

In some payment scenario, for example: The coin exchange provides coin-exchange service which transfer BTC to EOS ETH, BCH etc, you want show the clients many pay links with different amount, APP_BUTTON_GROUP can help you here.

print('send a link APP_BUTTON_GROUP')
btnBTC    = MIXIN_WS_API.packButton(mixin_config.client_id, BTC_ASSET_ID, "0.0001","BTC pay")
btnEOS    = MIXIN_WS_API.packButton(mixin_config.client_id, EOS_ASSET_ID, "0.01","EOS pay","#0080FF")
buttons   = [btnBTC,btnEOS]
MIXIN_WS_API.sendAppButtonGroup(ws, conversationId, userId, buttons)

Here show clients two buttons for EOS and BTC, you can add more buttons in this way.

APP_CARD

Maybe a group of buttons too simple for you, try a pay link which show a icon: APP_CARD.

print('send a link APP_CARD')
MIXIN_WS_API.sendAppCard(ws, conversationId, mixin_config.client_id,
                        BTC_ASSET_ID, "0.0001",
                        "https://images.mixin.one/HvYGJsV5TGeZ-X9Ek3FEQohQZ3fE9LBEBGcOcn4c4BNHovP4fW4YB97Dg5LcXoQ1hUjMEgjbl1DPlKg1TW7kK6XP=s128",
                        "Pay BTC 0.0001","topay")

Full source code