Use algorand explorer (ulamlabs#4)

backend/nft_market/api/tasks.py

@@ -111,7 +111,7 @@ def index_operations(asset_pk, update_timestamp=False, params=None):
             limit=1,
             txn_type="appl",
         )
-    response = algorand.indexer.search_transactions(**params)
+    response = algorand.explorer.search_transactions(**params)
     txs = response["transactions"]
     if len(txs) == 0:
         return
@@ -214,7 +214,7 @@ def index_holder(asset_pk, prev_tx=None, params=None):
             txn_type="axfer",
             min_amount=0,
         )
-    response = algorand.indexer.search_transactions(**params)
+    response = algorand.explorer.search_transactions(**params)
     txs = response["transactions"]
 
     txs = list(filter(is_non_zero_asset_tx, txs))

backend/nft_market/services/algorand.py

@@ -1,3 +1,6 @@
+import base64
+
+import requests
 from algosdk.v2client.algod import AlgodClient
 from algosdk.v2client.indexer import IndexerClient
 from django.conf import settings
@@ -7,3 +10,75 @@
 indexer = IndexerClient(
     settings.PURESTAKE_API_KEY, settings.PURESTAKE_INDEXER_URL, headers
 )
+
+
+class Explorer:
+    def search_transactions(
+        self,
+        limit=None,
+        next_page=None,
+        note_prefix=None,
+        txn_type=None,
+        sig_type=None,
+        txid=None,
+        min_round=None,
+        max_round=None,
+        asset_id=None,
+        start_time=None,
+        end_time=None,
+        min_amount=None,
+        max_amount=None,
+        address=None,
+        address_role=None,
+        exclude_close_to=False,
+        application_id=None,
+        rekey_to=False,
+    ):
+        query = dict()
+        if limit:
+            query["limit"] = limit
+        if next_page:
+            query["next"] = next_page
+        if note_prefix:
+            query["note-prefix"] = base64.b64encode(note_prefix).decode()
+        if txn_type:
+            query["tx-type"] = txn_type
+        if sig_type:
+            query["sig-type"] = sig_type
+        if txid:
+            query["txid"] = txid
+        if min_round:
+            query["min-round"] = min_round
+        if max_round:
+            query["max-round"] = max_round
+        if asset_id:
+            query["asset-id"] = asset_id
+        if end_time:
+            query["before-time"] = end_time
+        if start_time:
+            query["after-time"] = start_time
+        if min_amount:
+            query["currency-greater-than"] = min_amount
+        if max_amount:
+            query["currency-less-than"] = max_amount
+        if address:
+            query["address"] = address
+        if address_role:
+            query["address-role"] = address_role
+        if exclude_close_to:
+            query["exclude-close-to"] = "true"
+        if application_id:
+            query["application-id"] = application_id
+        if rekey_to:
+            query["rekey-to"] = "true"
+        r = requests.get(
+            "https://testnet.algoexplorerapi.io/idx2/v2/transactions",
+            params=query,
+            headers={
+                "content-type": "application/json",
+            },
+        )
+        return r.json()
+
+
+explorer = Explorer()

backend/pyproject.toml

@@ -19,6 +19,7 @@ uWSGI = "^2.0.19"
 dj-database-url = "^0.5.0"
 django-storages = {extras = ["google"], version = "^1.11.1"}
 psycopg2-binary = "^2.8.6"
+requests = "^2.25.1"
 
 [tool.poetry.dev-dependencies]
 black = "^20.8b1"