From dd7de90029dd88ff2302cf659b7854ed698c55d0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20Sza=C5=82owski?= <michal.szalowski@gmail.com>
Date: Tue, 31 Dec 2024 11:34:25 +0100
Subject: [PATCH] hotfix: fetching latest drep voting anchor

---
 CHANGELOG.md                                  |  1 +
 govtool/backend/sql/list-dreps.sql            | 10 +++--
 .../src/services/requests/getDRepList.ts      | 41 +++++++++++--------
 3 files changed, 30 insertions(+), 22 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8394e9532..2186fff03 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -39,6 +39,7 @@ changes.
 - Revert to drep_distr for providing active voting power
 - Add rewards amount in the ada holder voting power
 - Fix nested @value in jsonld metadatas [Issue 2509](https://github.com/IntersectMBO/govtool/issues/2509)
+- Fix fetching latest voting anchor after DRep updates
 
 ### Changed
 
diff --git a/govtool/backend/sql/list-dreps.sql b/govtool/backend/sql/list-dreps.sql
index f5680c319..025764910 100644
--- a/govtool/backend/sql/list-dreps.sql
+++ b/govtool/backend/sql/list-dreps.sql
@@ -18,7 +18,7 @@ DRepActivity AS (
     epoch_no DESC
   LIMIT 1
 )
-SELECT
+SELECT DISTINCT ON (dh.raw)
   encode(dh.raw, 'hex'),
   dh.view,
   dh.has_script,
@@ -26,7 +26,7 @@ SELECT
   encode(va.data_hash, 'hex'),
   dr_deposit.deposit,
   DRepDistr.amount,
-  (DRepActivity.epoch_no - COALESCE(block.epoch_no, block_first_register.epoch_no)) <= DRepActivity.drep_activity AS active,
+  (DRepActivity.epoch_no - newestRegister.epoch_no) <= DRepActivity.drep_activity AS active,
   encode(dr_voting_anchor.tx_hash, 'hex') AS tx_hash,
   newestRegister.time AS last_register_time,
   COALESCE(latestDeposit.deposit, 0),
@@ -72,7 +72,7 @@ FROM
       drep_registration dr
       JOIN tx ON tx.id = dr.tx_id
     WHERE
-      dr.deposit IS NOT NULL AND dr.deposit >= 0
+      COALESCE(dr.deposit, 0) >= 0
   ) AS dr_voting_anchor ON dr_voting_anchor.drep_hash_id = dh.id AND dr_voting_anchor.rn = 1
   LEFT JOIN (
     SELECT
@@ -122,6 +122,7 @@ FROM
   LEFT JOIN block ON block.id = tx.block_id
   LEFT JOIN (
     SELECT
+      block.epoch_no,
       block.time,
       dr.drep_hash_id,
       ROW_NUMBER() OVER (PARTITION BY dr.drep_hash_id ORDER BY dr.tx_id DESC) AS rn
@@ -130,7 +131,7 @@ FROM
       JOIN tx ON tx.id = dr.tx_id
       JOIN block ON block.id = tx.block_id
     WHERE
-      NOT (dr.deposit < 0)
+      COALESCE(dr.deposit, 0) >= 0
   ) AS newestRegister ON newestRegister.drep_hash_id = dh.id AND newestRegister.rn = 1
   LEFT JOIN (
     SELECT
@@ -164,6 +165,7 @@ GROUP BY
   DRepActivity.drep_activity,
   dr_voting_anchor.tx_hash,
   newestRegister.time,
+  newestRegister.epoch_no,
   latestDeposit.deposit,
   non_deregister_voting_anchor.url,
   fetch_error.message,
diff --git a/govtool/frontend/src/services/requests/getDRepList.ts b/govtool/frontend/src/services/requests/getDRepList.ts
index 5005e1313..835894481 100644
--- a/govtool/frontend/src/services/requests/getDRepList.ts
+++ b/govtool/frontend/src/services/requests/getDRepList.ts
@@ -1,5 +1,4 @@
 import { bech32 } from "bech32";
-
 import {
   type Infinite,
   type DRepStatus,
@@ -33,29 +32,35 @@ export const getDRepList = async ({
 }: GetDRepListArguments): Promise<Infinite<DRepData>> => {
   // DBSync contains wrong representation of DRep view for script based DReps,
   // but it's still used by BE
-  const searchPhrase = (() => {
-    if (rawSearchPhrase.startsWith("drep_script")) {
-      const { words } = bech32.decode(rawSearchPhrase);
-      return bech32.encode("drep", words);
-    }
-    if (rawSearchPhrase.startsWith("drep")) {
-      const decodedIdentifier = decodeCIP129Identifier(rawSearchPhrase);
-      if (decodedIdentifier) {
-        const isCIP129Identifier = decodedIdentifier.txID.startsWith("22");
-        if (isCIP129Identifier) {
+  const searchPhraseProcessor = async () => {
+    try {
+      if (rawSearchPhrase.startsWith("drep_script")) {
+        const { words } = bech32.decode(rawSearchPhrase);
+        return bech32.encode("drep", words);
+      }
+      if (rawSearchPhrase.startsWith("drep")) {
+        const decodedIdentifier = decodeCIP129Identifier(rawSearchPhrase);
+        if (decodedIdentifier) {
+          const isCIP129Identifier = decodedIdentifier.txID.startsWith("22");
+          if (isCIP129Identifier) {
+            return encodeCIP129Identifier({
+              txID: decodedIdentifier.txID.slice(2),
+              bech32Prefix: "drep",
+            });
+          }
           return encodeCIP129Identifier({
-            txID: decodedIdentifier.txID.slice(2),
+            txID: decodedIdentifier.txID,
             bech32Prefix: "drep",
           });
         }
-        return encodeCIP129Identifier({
-          txID: decodedIdentifier.txID,
-          bech32Prefix: "drep",
-        });
       }
+      return rawSearchPhrase;
+    } catch (e) {
+      return rawSearchPhrase;
     }
-    return rawSearchPhrase;
-  })();
+  };
+
+  const searchPhrase = await searchPhraseProcessor();
 
   const response = await API.get<Infinite<DrepDataDTO>>("/drep/list", {
     params: {