Add transfer auth filters

apps/cic-eth/cic_eth/runnable/daemons/filters/__init__.py

@@ -2,3 +2,4 @@ from .callback import CallbackFilter
 from .tx import TxFilter
 from .gas import GasFilter
 from .register import RegistrationFilter
+from .transferauth import TransferAuthFilter

apps/cic-eth/cic_eth/runnable/daemons/filters/gas.py

@@ -1,7 +1,7 @@
 # standard imports
 import logging
 
-# third-party imports
+# external imports
 from cic_registry.chain import ChainSpec
 from hexathon import add_0x
 
@@ -24,7 +24,7 @@ class GasFilter(SyncFilter):
         self.chain_spec = chain_spec
 
 
-    def filter(self, conn, block, tx, session): #rcpt, chain_str, session=None):
+    def filter(self, conn, block, tx, session):
         tx_hash_hex = add_0x(tx.hash)
         if tx.value > 0:
             logg.debug('gas refill tx {}'.format(tx_hash_hex))

apps/cic-eth/cic_eth/runnable/daemons/filters/transferauth.py

@@ -0,0 +1,85 @@
+# standard imports
+import logging
+
+# external imports
+import celery
+from hexathon import (
+        strip_0x,
+        add_0x,
+        )
+from chainlib.eth.address import to_checksum
+from .base import SyncFilter
+
+
+logg = logging.getLogger(__name__)
+
+transfer_request_signature = 'ed71262a'
+
+def unpack_create_request(data):
+
+    data = strip_0x(data)
+    cursor = 0
+    f = data[cursor:cursor+8]
+    cursor += 8
+
+    if f != transfer_request_signature:
+        raise ValueError('Invalid create request data ({})'.format(f))
+
+    o = {}
+    o['sender'] = data[cursor+24:cursor+64]
+    cursor += 64
+    o['recipient'] = data[cursor+24:cursor+64]
+    cursor += 64
+    o['token'] = data[cursor+24:cursor+64]
+    cursor += 64
+    o['value'] = int(data[cursor:], 16)
+    return o
+
+
+class TransferAuthFilter(SyncFilter):
+
+    def __init__(self, registry, chain_spec, queue=None):
+        self.queue = queue
+        self.chain_spec = chain_spec
+        self.transfer_request_contract = registry.get_contract(self.chain_spec, 'TransferAuthorization')
+
+
+    def filter(self, conn, block, tx, session): #rcpt, chain_str, session=None):
+
+        payloadlength = len(tx.payload)
+        if len(tx.payload) != 8+256:
+            logg.debug('{} below minimum length for a transfer auth call'.format(payloadlength))
+            logg.debug('payload {}'.format(tx.payload))
+            return False
+
+        recipient = tx.inputs[0]
+        if recipient != self.transfer_request_contract.address():
+            logg.debug('not our transfer auth contract address {}'.format(recipient))
+            return False
+
+        o = unpack_create_request(tx.payload) 
+           
+        sender = add_0x(to_checksum(o['sender']))
+        recipient = add_0x(to_checksum(recipient))
+        token = add_0x(to_checksum(o['token']))
+        s = celery.signature(
+            'cic_eth.eth.token.approve',
+            [
+                [
+                    {
+                        'address': token,
+                        },
+                    ],
+                sender,
+                recipient,
+                o['value'],
+                str(self.chain_spec),
+                ],
+            queue=self.queue,
+            )
+        t = s.apply_async()
+        return True
+
+
+    def __str__(self):
+        return 'cic-eth transfer auth filter'

apps/cic-eth/cic_eth/runnable/daemons/tracker.py

@@ -58,6 +58,7 @@ from cic_eth.runnable.daemons.filters import (
         GasFilter,
         TxFilter,
         RegistrationFilter,
+        TransferAuthFilter,
         )
 
 script_dir = os.path.realpath(os.path.dirname(__file__))
@@ -146,6 +147,8 @@ def main():
 
     gas_filter = GasFilter(chain_spec, config.get('_CELERY_QUEUE'))
 
+    transfer_auth_filter = TransferAuthFilter(registry, chain_spec, config.get('_CELERY_QUEUE'))
+
     i = 0
     for syncer in syncers:
         logg.debug('running syncer index {}'.format(i))
@@ -153,6 +156,7 @@ def main():
         syncer.add_filter(registration_filter)
         # TODO: the two following filter functions break the filter loop if return uuid. Pro: less code executed. Con: Possibly unintuitive flow break
         syncer.add_filter(tx_filter)
+        syncer.add_filter(transfer_auth_filter)
         for cf in callback_filters:
             syncer.add_filter(cf)
 

docker-compose.yml

@@ -161,7 +161,7 @@ services:
       - -c
       - |
         if [[ -f /tmp/cic/config/.env ]]; then source /tmp/cic/config/.env; fi 
-        /usr/local/bin/cic-cache-tracker -v
+        /usr/local/bin/cic-cache-tracker -vv
     volumes:
       - contract-config:/tmp/cic/config/:ro
 
@@ -274,7 +274,7 @@ services:
       - -c
       - |
         if [[ -f /tmp/cic/config/.env ]]; then source /tmp/cic/config/.env; fi 
-        ./start_tracker.sh -v -c /usr/local/etc/cic-eth
+        ./start_tracker.sh -vv -c /usr/local/etc/cic-eth
     # command: "/root/start_manager.sh head -vv"