[keyserver] Extract database error codes

Summary:
Keep all the db error codes in a single place.

Depends on D8494

Test Plan: Flow. Searched for all the `errno` usages to find all the codes we might use.

Reviewers: kamil, inka

Reviewed By: inka

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D8608

keyserver/src/database/database.js

@@ -14,6 +14,8 @@ import { getScriptContext } from '../scripts/script-context.js';
 const SQLStatement: SQLStatementType = SQL.SQLStatement;
 
 const MYSQL_DUPLICATE_ENTRY_FOR_KEY_ERROR_CODE = 1062;
+const MYSQL_TABLE_DOESNT_EXIST_ERROR_CODE = 1146;
+const MYSQL_DEADLOCK_ERROR_CODE = 1213;
 
 let migrationConnection;
 async function getMigrationConnection() {
@@ -107,8 +109,6 @@ const fakeResult: QueryResults = (() => {
   return result;
 })();
 
-const MYSQL_DEADLOCK_ERROR_CODE = 1213;
-
 type ConnectionContext = {
   +migrationsActive?: boolean,
 };
@@ -206,4 +206,5 @@ export {
   dbQuery,
   rawSQL,
   MYSQL_DUPLICATE_ENTRY_FOR_KEY_ERROR_CODE,
+  MYSQL_TABLE_DOESNT_EXIST_ERROR_CODE,
 };

keyserver/src/database/migrations.js

@@ -6,7 +6,12 @@ import { isDev } from 'lib/utils/dev-utils.js';
 import { getMessageForException } from 'lib/utils/errors.js';
 import sleep from 'lib/utils/sleep.js';
 
-import { dbQuery, SQL, setConnectionContext } from './database.js';
+import {
+  dbQuery,
+  SQL,
+  setConnectionContext,
+  MYSQL_TABLE_DOESNT_EXIST_ERROR_CODE,
+} from './database.js';
 import { fetchDBVersion, updateDBVersion } from './db-version.js';
 import { migrations } from './migration-config.js';
 import { setupDB } from './setup-db.js';
@@ -50,8 +55,6 @@ async function migrate(): Promise<boolean> {
   return true;
 }
 
-const MYSQL_TABLE_DOESNT_EXIST_ERROR_CODE = 1146;
-
 async function setUpDBAndReturnVersion(): Promise<number> {
   try {
     return await fetchDBVersion();