Feat: Support Selectable Write Ledger

Multiledger.md

@@ -1,6 +1,6 @@
 # Multi-ledger in ACA-Py <!-- omit in toc -->
 
-Ability to use multiple Indy ledgers (both IndySdk and IndyVdr) for resolving a `DID` by the ACA-Py agent. For read requests, checking of multiple ledgers in parallel is done dynamically according to logic detailed in [Read Requests Ledger Selection](#read-requests). For write requests, dynamic allocation of `write_ledger` is not supported. Write ledger can be assigned using `is_write` in the [configuration](#config-properties) or using any of the `--genesis-url`, `--genesis-file`, and `--genesis-transactions` startup (ACA-Py) arguments. If no write ledger is assigned then a `ConfigError` is raised.
+Ability to use multiple Indy ledgers (both IndySdk and IndyVdr) for resolving a `DID` by the ACA-Py agent. For read requests, checking of multiple ledgers in parallel is done dynamically according to logic detailed in [Read Requests Ledger Selection](#read-requests). For write requests, dynamic allocation of `write_ledger` is supported. Configurable write ledgers can be assigned using `is_write` in the [configuration](#config-properties) or using any of the `--genesis-url`, `--genesis-file`, and `--genesis-transactions` startup (ACA-Py) arguments. If no write ledger is assigned then a `ConfigError` is raised.
 
 More background information including problem statement, design (algorithm) and more can be found [here](https://docs.google.com/document/d/109C_eMsuZnTnYe2OAd02jAts1vC4axwEKIq7_4dnNVA).
 
@@ -30,12 +30,45 @@ If `--genesis-transactions-list` is specified, then `--genesis-url, --genesis-fi
 - id: localVON
   is_production: false
   genesis_url: 'http://host.docker.internal:9000/genesis'
-- id: bcorvinTest
+- id: bcovrinTest
   is_production: true
   is_write: true
   genesis_url: 'http://test.bcovrin.vonx.io/genesis'
 ```
 
+```
+- id: localVON
+  is_production: false
+  genesis_url: 'http://host.docker.internal:9000/genesis'
+- id: bcovrinTest
+  is_production: true
+  is_write: true
+  genesis_url: 'http://test.bcovrin.vonx.io/genesis'
+  endorser_did: '9QPa6tHvBHttLg6U4xvviv'
+  endorser_alias: 'endorser_test'
+- id: greenlightDev
+  is_production: true
+  is_write: true
+  genesis_url: 'http://dev.greenlight.bcovrin.vonx.io/genesis'
+```
+
+Note: `is_write` property means that the ledger is write configurable. With reference to the above config example, both `bcovrinTest` and `greenlightDev` ledgers are write configurable. By default, on startup `bcovrinTest` will be the write ledger as it is the topmost write configurable production ledger, [more details](#write-requests) regarding the selection rule. Using `PUT /ledger/{ledger_id}/set-write-ledger` endpoint, either `greenlightDev` and `bcovrinTest` can be set as the write ledger.
+
+```
+- id: localVON
+  is_production: false
+  is_write: true
+  genesis_url: 'http://host.docker.internal:9000/genesis'
+- id: bcovrinTest
+  is_production: true
+  genesis_url: 'http://test.bcovrin.vonx.io/genesis'
+- id: greenlightDev
+  is_production: true
+  genesis_url: 'http://dev.greenlight.bcovrin.vonx.io/genesis'
+```
+
+Note: For instance with regards to example config above, `localVON` will be the write ledger, as there are no production ledgers which are configurable it will choose the topmost write configurable non production ledger.
+
 ### Config properties
 For each ledger, the required properties are as following:
 
@@ -52,17 +85,25 @@ Optional properties:
 - `pool_name`: name of the indy pool to be opened
 - `keepalive`: how many seconds to keep the ledger open
 - `socks_proxy`
-- `is_write`: Whether the ledger is the write ledger. Only one ledger can be assigned, otherwise a `ConfigError` is raised.
+- `is_write`: Whether this ledger is writable. It requires atleast one write ledger specified. Multiple write ledgers can be specified in config.
+- `endorser_did`: Endorser public DID registered on the ledger, needed for supporting Endorser protocol at multi-ledger level.
+- `endorser_alias`: Endorser alias for this ledger, needed for supporting Endorser protocol at multi-ledger level.
+
+Note: Both `endorser_did` and `endorser_alias` are part of the endorser info. Whenever a write ledger is selected using `PUT /ledger/{ledger_id}/set-write-ledger`, the endorser info associated with that ledger in the config updates the `endorser.endorser_public_did` and `endorser.endorser_alias` profile setting respectively.
 
 
 ## Multi-ledger Admin API
 
-Multi-ledger related actions are grouped under the `ledger` topic in the SwaggerUI or under `/ledger/multiple` path.
+Multi-ledger related actions are grouped under the `ledger` topic in the SwaggerUI.
 
-- `/ledger/multiple/config`:
+- GET `/ledger/config`:
 Returns the multiple ledger configuration currently in use
-- `/ledger/multiple/get-write-ledger`:
+- GET `/ledger/get-write-ledger`:
 Returns the current active/set `write_ledger's` `ledger_id`
+- GET `/ledger/get-write-ledgers`:
+Returns list of available `write_ledger's` `ledger_id`
+- PUT `/ledger/{ledger_id}/set-write-ledger`:
+Set active `write_ledger's` `ledger_id`
 
 ## Ledger Selection
 
@@ -103,7 +144,7 @@ If multiple ledgers are configured then `IndyLedgerRequestsExecutor` service ext
 
 ### Write Requests
 
-On startup, the first configured applicable ledger is assigned as the `write_ledger` [`BaseLedger`], the selection is dependant on the order (top-down) and whether it is `production` or `non_production`. For instance, considering this [example configuration](#example-config-file), ledger `bcorvinTest` will be set as `write_ledger` as it is the topmost `production` ledger. If no `production` ledgers are included in configuration then the topmost `non_production` ledger is selected.
+On startup, the first configured applicable ledger is assigned as the `write_ledger` [`BaseLedger`], the selection is dependant on the order (top-down) and whether it is `production` or `non_production`. For instance, considering this [example configuration](#example-config-file), ledger `bcovrinTest` will be set as `write_ledger` as it is the topmost `production` ledger. If no `production` ledgers are included in configuration then the topmost `non_production` ledger is selected.
 
 ## A Special Warning for TAA Acceptance
 

aries_cloudagent/askar/profile.py

@@ -23,6 +23,7 @@
 from ..ledger.indy_vdr import IndyVdrLedger, IndyVdrLedgerPool
 from ..storage.base import BaseStorage, BaseStorageSearch
 from ..storage.vc_holder.base import VCHolder
+from ..utils.multi_ledger import get_write_ledger_config_for_profile
 from ..wallet.base import BaseWallet
 from ..wallet.crypto import validate_seed
 
@@ -120,8 +121,44 @@ def bind_providers(self):
                 ref(self),
             ),
         )
-
-        if self.ledger_pool:
+        if (
+            self.settings.get("ledger.ledger_config_list")
+            and len(self.settings.get("ledger.ledger_config_list")) >= 1
+        ):
+            write_ledger_config = get_write_ledger_config_for_profile(
+                settings=self.settings
+            )
+            cache = self.context.injector.inject_or(BaseCache)
+            injector.bind_provider(
+                BaseLedger,
+                ClassProvider(
+                    IndyVdrLedger,
+                    IndyVdrLedgerPool(
+                        write_ledger_config.get("pool_name")
+                        or write_ledger_config.get("id"),
+                        keepalive=write_ledger_config.get("keepalive"),
+                        cache=cache,
+                        genesis_transactions=write_ledger_config.get(
+                            "genesis_transactions"
+                        ),
+                        read_only=write_ledger_config.get("read_only"),
+                        socks_proxy=write_ledger_config.get("socks_proxy"),
+                    ),
+                    ref(self),
+                ),
+            )
+            self.settings["ledger.write_ledger"] = write_ledger_config.get("id")
+            if (
+                "endorser_alias" in write_ledger_config
+                and "endorser_did" in write_ledger_config
+            ):
+                self.settings["endorser.endorser_alias"] = write_ledger_config.get(
+                    "endorser_alias"
+                )
+                self.settings["endorser.endorser_public_did"] = write_ledger_config.get(
+                    "endorser_did"
+                )
+        elif self.ledger_pool:
             injector.bind_provider(
                 BaseLedger, ClassProvider(IndyVdrLedger, self.ledger_pool, ref(self))
             )

aries_cloudagent/askar/tests/test_profile.py

@@ -6,6 +6,7 @@
 
 from ...askar.profile import AskarProfile
 from ...config.injection_context import InjectionContext
+from ...ledger.base import BaseLedger
 
 from .. import profile as test_module
 
@@ -24,6 +25,41 @@ async def test_init_success(open_store):
     assert askar_profile.opened == open_store
 
 
+@pytest.mark.asyncio
+async def test_init_multi_ledger(open_store):
+    context = InjectionContext(
+        settings={
+            "ledger.ledger_config_list": [
+                {
+                    "id": "BCovrinDev",
+                    "is_production": True,
+                    "is_write": True,
+                    "endorser_did": "9QPa6tHvBHttLg6U4xvviv",
+                    "endorser_alias": "endorser_dev",
+                    "genesis_transactions": mock.MagicMock(),
+                },
+                {
+                    "id": "SovrinStagingNet",
+                    "is_production": False,
+                    "genesis_transactions": mock.MagicMock(),
+                },
+            ]
+        }
+    )
+    askar_profile = AskarProfile(
+        open_store,
+        context=context,
+    )
+
+    assert askar_profile.opened == open_store
+    assert askar_profile.settings["endorser.endorser_alias"] == "endorser_dev"
+    assert (
+        askar_profile.settings["endorser.endorser_public_did"]
+        == "9QPa6tHvBHttLg6U4xvviv"
+    )
+    assert (askar_profile.inject_or(BaseLedger)).pool_name == "BCovrinDev"
+
+
 @pytest.mark.asyncio
 async def test_remove_success(open_store):
     openStore = open_store

aries_cloudagent/config/argparse.py

@@ -916,6 +916,7 @@ def get_settings(self, args: Namespace) -> dict:
             single_configured = False
             multi_configured = False
             update_pool_name = False
+            write_ledger_specified = False
             if args.genesis_url:
                 settings["ledger.genesis_url"] = args.genesis_url
                 single_configured = True
@@ -930,27 +931,24 @@ def get_settings(self, args: Namespace) -> dict:
                     txn_config_list = yaml.safe_load(stream)
                     ledger_config_list = []
                     for txn_config in txn_config_list:
-                        ledger_config_list.append(txn_config)
                         if "is_write" in txn_config and txn_config["is_write"]:
-                            if "genesis_url" in txn_config:
-                                settings["ledger.genesis_url"] = txn_config[
-                                    "genesis_url"
-                                ]
-                            elif "genesis_file" in txn_config:
-                                settings["ledger.genesis_file"] = txn_config[
-                                    "genesis_file"
-                                ]
-                            elif "genesis_transactions" in txn_config:
-                                settings["ledger.genesis_transactions"] = txn_config[
-                                    "genesis_transactions"
-                                ]
-                            else:
-                                raise ArgsParseError(
-                                    "No genesis information provided for write ledger"
-                                )
-                            if "id" in txn_config:
-                                settings["ledger.pool_name"] = txn_config["id"]
-                                update_pool_name = True
+                            write_ledger_specified = True
+                        if (
+                            "genesis_url" not in txn_config
+                            and "genesis_file" not in txn_config
+                            and "genesis_transactions" not in txn_config
+                        ):
+                            raise ArgsParseError(
+                                "No genesis information provided for write ledger"
+                            )
+                        if "id" in txn_config and "pool_name" not in txn_config:
+                            txn_config["pool_name"] = txn_config["id"]
+                        update_pool_name = True
+                        ledger_config_list.append(txn_config)
+                    if not write_ledger_specified:
+                        raise ArgsParseError(
+                            "No write ledger genesis provided in multi-ledger config"
+                        )
                     settings["ledger.ledger_config_list"] = ledger_config_list
                     multi_configured = True
             if not (single_configured or multi_configured):

aries_cloudagent/config/ledger.py

@@ -89,26 +89,27 @@ async def load_multiple_genesis_transactions_from_config(settings: Settings):
             False if config.get("is_write") is None else config.get("is_write")
         )
         ledger_id = config.get("id") or str(uuid.uuid4())
-        if is_write_ledger and write_ledger_set:
-            raise ConfigError("Only a single ledger can be is_write")
-        elif is_write_ledger:
+        if is_write_ledger:
             write_ledger_set = True
-        ledger_txns_list.append(
-            {
-                "id": ledger_id,
-                "is_production": (
-                    True
-                    if config.get("is_production") is None
-                    else config.get("is_production")
-                ),
-                "is_write": is_write_ledger,
-                "genesis_transactions": txns,
-                "keepalive": int(config.get("keepalive", 5)),
-                "read_only": bool(config.get("read_only", False)),
-                "socks_proxy": config.get("socks_proxy"),
-                "pool_name": config.get("pool_name", ledger_id),
-            }
-        )
+        config_item = {
+            "id": ledger_id,
+            "is_production": (
+                True
+                if config.get("is_production") is None
+                else config.get("is_production")
+            ),
+            "is_write": is_write_ledger,
+            "genesis_transactions": txns,
+            "keepalive": int(config.get("keepalive", 5)),
+            "read_only": bool(config.get("read_only", False)),
+            "socks_proxy": config.get("socks_proxy"),
+            "pool_name": config.get("pool_name", ledger_id),
+        }
+        if "endorser_alias" in config:
+            config_item["endorser_alias"] = config.get("endorser_alias")
+        if "endorser_did" in config:
+            config_item["endorser_did"] = config.get("endorser_did")
+        ledger_txns_list.append(config_item)
     if not write_ledger_set and not (
         settings.get("ledger.genesis_transactions")
         or settings.get("ledger.genesis_file")

aries_cloudagent/config/tests/test-ledger-args-no-genesis.yaml

@@ -0,0 +1,7 @@
+- id: sovrinMain
+  is_production: true
+  is_write: true
+- id: sovrinStaging
+  is_production: true
+- id: sovrinTest
+  is_production: false

aries_cloudagent/config/tests/test-ledger-args-no-write.yaml

@@ -0,0 +1,32 @@
+- id: sovrinMain
+  is_production: true
+  genesis_transactions:
+    reqSignature: {}
+    txn:
+      data:
+        data:
+          alias: Node1
+          blskey: >-
+            4N8aUNHSgjQVgkpm8nhNEfDf6txHznoYREg9kirmJrkivgL4oSEimFF6nsQ6M41QvhM2Z33nves5vfSn9n1UwNFJBYtWVnHYMATn76vLuL3zU88KyeAYcHfsih3He6UHcXDxcaecHVz6jhCYz1P2UZn2bDVruL5wXpehgBfBaLKm3Ba
+          blskey_pop: >-
+            RahHYiCvoNCtPTrVtP7nMC5eTYrsUA8WjXbdhNc8debh1agE9bGiJxWBXYNFbnJXoXhWFMvyqhqhRoq737YQemH5ik9oL7R4NTTCz2LEZhkgLJzB3QRQqJyBNyv7acbdHrAT8nQ9UkLbaVL9NBpnWXBTw4LEMePaSHEw66RzPNdAX1
+          client_ip: 192.168.65.3
+          client_port: 9702
+          node_ip: 192.168.65.3
+          node_port: 9701
+          services:
+            - VALIDATOR
+        dest: Gw6pDLhcBcoQesN72qfotTgFa7cbuqZpkX3Xo6pLhPhv
+      metadata:
+        from: Th7MpTaRZVRYnPiabds81Y
+      type: '0'
+    txnMetadata:
+      seqNo: 1
+      txnId: fea82e10e894419fe2bea7d96296a6d46f50f93f9eeda954ec461b2ed2950b62
+    ver: '1'
+- id: sovrinStaging
+  is_production: true
+  genesis_file: /home/indy/ledger/sandbox/pool_transactions_genesis
+- id: sovrinTest
+  is_production: false
+  genesis_url: 'http://localhost:9000/genesis'

aries_cloudagent/config/tests/test-ledger-args.yaml

@@ -1,5 +1,6 @@
 - id: sovrinMain
   is_production: true
+  is_write: true
   genesis_transactions:
     reqSignature: {}
     txn:
@@ -26,6 +27,7 @@
     ver: '1'
 - id: sovrinStaging
   is_production: true
+  is_write: true
   genesis_file: /home/indy/ledger/sandbox/pool_transactions_genesis
 - id: sovrinTest
   is_production: false