Hi Steemians,

Image source: https://pixabay.com/de/roboter-computer-bots-charakter-764951/

welcome to part 2 of little series about my new SprayBot for the https://steemwhale.io/ fountain.

In part 1 we learned how to send a transfer automatically to another STEEM account.

After the successful transfer we have to listen to the STEEM blockchain to detect the incoming transfer from @whalefountain with the image URL.

We need an instance of Blockchain, which is configured with a STEEM client (Instance of Steem).

In a while-loop we stream all Blockchain events until we find a transfer from @whalefountain to our account.

from beem.blockchain import Blockchain

...
stm = Steem(node = "https://api.steemit.com/", bundle=True, keys=[active_wif])
chain = Blockchain(steem_instance = stm)

while True:
    try:
        for operation in chain.stream(only_ops=False):
            if operation["type"] == "transfer":
                if operation["from"] == "whalefountain":
                    if operation["to"] == "YOUR_ACCOUNT_NAME":
                        imgUrl = extractUrl(operation["memo"])

The extraction of the image url is also very easy.

Sometimes one get's two transfers from @whalefountain, that's why I check if the memo ends with "gif".

def extractUrl(memo):
    if (memo.endswith("gif")):
        imgUrl = memo[memo.index("https://i.imgur.com"):]
        return imgUrl
    return None

In the 3rd and final part I will show you how to create a post with beem.