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Reuse credential offers and requests when possible #242

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merged 7 commits into from
Oct 30, 2019
Merged

Reuse credential offers and requests when possible #242

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bbd0b4a
implement credential offer & request caching in credential manager cl…
andrewwhitehead Oct 28, 2019
6accded
report progress as credential exchanges are completed; add --count op…
andrewwhitehead Oct 28, 2019
d7a6ba8
additional unit tests; move receive_offer logic from message handler …
andrewwhitehead Oct 30, 2019
99f7ae8
test creating, receiving credential requests
andrewwhitehead Oct 30, 2019
d90cd42
test issue_credential and receive_credential
andrewwhitehead Oct 30, 2019
c385f3d
test credential storage
andrewwhitehead Oct 30, 2019
ba8e8bc
fix typo
andrewwhitehead Oct 30, 2019
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62 changes: 46 additions & 16 deletions aries_cloudagent/messaging/credentials/manager.py
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Original file line number Diff line number Diff line change
Expand Up @@ -65,10 +65,18 @@ async def create_offer(

"""

issuer: BaseIssuer = await self.context.inject(BaseIssuer)
credential_offer = await issuer.create_credential_offer(
credential_definition_id
)
cache_key = f"credential_offer::{credential_definition_id}"
cached = await CredentialExchange.get_cached_key(self.context, cache_key)
if cached:
credential_offer = cached["offer"]
else:
issuer: BaseIssuer = await self.context.inject(BaseIssuer)
credential_offer = await issuer.create_credential_offer(
credential_definition_id
)
await CredentialExchange.set_cached_key(
self.context, cache_key, {"offer": credential_offer}, 3600
)

credential_offer_message = CredentialOffer(
offer_json=json.dumps(credential_offer)
Expand Down Expand Up @@ -146,19 +154,41 @@ async def create_request(
credential_exchange_record.credential_exchange_id,
)
else:
ledger: BaseLedger = await self.context.inject(BaseLedger)
async with ledger:
credential_definition = await ledger.get_credential_definition(
credential_definition_id
)

holder: BaseHolder = await self.context.inject(BaseHolder)
(
credential_exchange_record.credential_request,
credential_exchange_record.credential_request_metadata,
) = await holder.create_credential_request(
credential_offer, credential_definition, did
nonce = credential_offer["nonce"]
cache_key = (
f"credential_request::{credential_definition_id}::{did}::{nonce}"
)
cached = await CredentialExchange.get_cached_key(self.context, cache_key)
if cached:
(
credential_exchange_record.credential_request,
credential_exchange_record.credential_request_metadata,
) = (cached["request"], cached["metadata"])
else:
ledger: BaseLedger = await self.context.inject(BaseLedger)
async with ledger:
credential_definition = await ledger.get_credential_definition(
credential_definition_id
)

holder: BaseHolder = await self.context.inject(BaseHolder)
(
credential_exchange_record.credential_request,
credential_exchange_record.credential_request_metadata,
) = await holder.create_credential_request(
credential_offer, credential_definition, did
)
await CredentialExchange.set_cached_key(
self.context,
cache_key,
{
"request": credential_exchange_record.credential_request,
"metadata": (
credential_exchange_record.credential_request_metadata
),
},
7200,
)

credential_request_message = CredentialRequest(
request=json.dumps(credential_exchange_record.credential_request)
Expand Down
42 changes: 1 addition & 41 deletions aries_cloudagent/messaging/issue_credential/v1_0/handlers/credential_offer_handler.py
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Original file line number Diff line number Diff line change
@@ -1,7 +1,5 @@
"""Basic message handler."""


from .....storage.error import StorageNotFoundError
from ....base_handler import (
BaseHandler,
BaseResponder,
Expand All @@ -10,8 +8,6 @@
)
from ..manager import CredentialManager
from ..messages.credential_offer import CredentialOffer
from ..messages.credential_proposal import CredentialProposal
from ..models.credential_exchange import V10CredentialExchange


class CredentialOfferHandler(BaseHandler):
Expand All @@ -38,43 +34,7 @@ async def handle(self, context: RequestContext, responder: BaseResponder):

credential_manager = CredentialManager(context)

indy_offer = context.message.indy_offer(0)
credential_proposal_dict = CredentialProposal(
comment=context.message.comment,
credential_proposal=context.message.credential_preview,
cred_def_id=indy_offer["cred_def_id"],
schema_id=indy_offer["schema_id"],
).serialize()

# Get credential exchange record (holder sent proposal first)
# or create it (issuer sent offer first)
try:
(
credential_exchange_record
) = await V10CredentialExchange.retrieve_by_tag_filter(
context,
{"thread_id": context.message._thread_id},
{"connection_id": context.connection_record.connection_id},
)
credential_exchange_record.credential_proposal_dict = (
credential_proposal_dict
)
except StorageNotFoundError: # issuer sent this offer free of any proposal
credential_exchange_record = V10CredentialExchange(
connection_id=context.connection_record.connection_id,
thread_id=context.message._thread_id,
initiator=V10CredentialExchange.INITIATOR_EXTERNAL,
role=V10CredentialExchange.ROLE_HOLDER,
credential_definition_id=indy_offer["cred_def_id"],
schema_id=indy_offer["schema_id"],
credential_proposal_dict=credential_proposal_dict,
)

credential_exchange_record.credential_offer = indy_offer

credential_exchange_record = await credential_manager.receive_offer(
credential_exchange_record
)
credential_exchange_record = await credential_manager.receive_offer()

# If auto respond is turned on, automatically reply with credential request
if context.settings.get("debug.auto_respond_credential_offer"):
Expand Down
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