djWebdApp Examples

Signals

get_args: customizing transaction arguments

Transaction args are stored in a JSON column: this won’t let use leverage all python types, such as bytes.

If you want an argument to be provided to the blockchain provider client as bytes for example, you can as such:

from djwebdapp.models import get_args
from django.dispatch import receiver

@receiver(get_args)
def bytes_arg(transaction, **kwargs):
    if transaction.function == 'somefunction':
        return [bytes(transactions.args[0])]

Chaining blockchain calls

This example demonstrates how to generate an initial mint call to deploy whenever a new contract is deployed:

from djwebdapp_tezos.models import TezosTransaction
from django.db.models import signals
from django.dispatch import receiver


@receiver(signals.post_save, sender=TezosTransaction)
def auto_mint(sender, instance, **kwargs):
    if not instance.address:
        # we're not a contract or not ready
        return

    if instance.call_set.count() > 1:
        # we have a mint already
        return

    mint = TezosTransaction.objects.create(
        sender=instance.sender,
        state='deploy',
        max_fails=2,
        contract=instance,
        function='mint',
        args=(
            instance.sender.address,
            1000,
        ),
    )