Lesson 6: Cardano Vending machines part 1

This is the code explained in the video.

 
import json
import requests
import subprocess

address="ADDRESSVENDING"
url = "https://cardano-mainnet.blockfrost.io/api/v0/addresses/"+address+"/utxos"

payload={}
headers = {
  'project_id': 'SECRET'
}
max=0
response = requests.request("GET", url, headers=headers, data=payload)

txs=json.loads(response.text)
buyers={}

priceInLovelace=15000000 #example 15 ADA becomes 15000000
for tx in txs:
    if len(tx['amount'])>1 or int(tx['amount'][0]['quantity'])<priceInLovelace:
        continue
    buyer={}
    buyer['tx']=tx['tx_hash']+'#'+str(tx['tx_index'])
    buyer['amount']=int(tx['amount'][0]['quantity'])

    url='https://cardano-mainnet.blockfrost.io/api/v0/txs/'+tx['tx_hash']+"/utxos"

    response = requests.request("GET", url, headers=headers, data=payload)
    info=json.loads(response.text)
    buyer['address']=info['inputs'][0]['address']
    buyers[buyer['tx']]=buyer

#print(buyers)

for buyer in buyers:
    sender=buyers[buyer]['address']
    tx=buyers[buyer]['tx']
    paid=buyers[buyer]['amount']
    cmd='cardano-cli transaction build-raw --fee 0 --tx-in '+tx+' --tx-out '+sender+'+0 --out-file matx.raw'
    out=subprocess.getoutput(cmd)
    print(out)

    cmd = 'cardano-cli query protocol-parameters --mainnet --out-file protocol.json'
    out = subprocess.getoutput(cmd)
    cmd='cardano-cli transaction calculate-min-fee --tx-body-file matx.raw  --tx-in-count 1 --tx-out-count 1 --witness-count 1 --mainnet protocol-params-file protocol.json'
    out=subprocess.getoutput(cmd)
    print(out)

    fee=int(out.split()[0])
    change=paid-fee
    print(change)

    cmd='cardano-cli transaction build-raw --fee '+str(fee)+' --tx-in '+tx+' --tx-out '+sender+'+'+str(change)+' --out-file matx.raw'

    out=subprocess.getoutput(cmd)
    print(cmd)


    cmd='cardano-cli transaction sign --signing-key-file  receiverAddress/payment.skey   --mainnet --tx-body-file matx.raw --out-file matx.signed'
    out=subprocess.getoutput(cmd)
    cmd='cardano-cli transaction submit --tx-file matx.signed --mainnet'
    out=subprocess.getoutput(cmd)
    print(out)

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Lesson 6: Cardano Vending machines part 1

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