refactor(dialects/postgres): asyncify methods (#12129)

lib/dialects/postgres/connection-manager.js

@@ -84,7 +84,7 @@ class ConnectionManager extends AbstractConnectionManager {
     return this.lib.types.getTypeParser(oid, ...args);
   }
 
-  connect(config) {
+  async connect(config) {
     config.user = config.username;
     const connectionConfig = _.pick(config, [
       'user', 'password', 'host', 'database', 'port'
@@ -121,7 +121,7 @@ class ConnectionManager extends AbstractConnectionManager {
         ]));
     }
 
-    return new Promise((resolve, reject) => {
+    const connection = await new Promise((resolve, reject) => {
       let responded = false;
 
       const connection = new this.lib.Client(connectionConfig);
@@ -194,7 +194,8 @@ class ConnectionManager extends AbstractConnectionManager {
           resolve(connection);
         }
       });
-    }).then(connection => {
+    });
+
     let query = '';
 
     if (this.sequelize.options.standardConformingStrings !== false && connection['standard_conforming_strings'] !== 'on') {
@@ -218,52 +219,46 @@ class ConnectionManager extends AbstractConnectionManager {
     }
 
     if (query) {
-        return Promise.resolve(connection.query(query)).then(() => connection);
+      await connection.query(query);
     }
-      return connection;
-    }).then(connection => {
     if (Object.keys(this.nameOidMap).length === 0 &&
       this.enumOids.oids.length === 0 &&
       this.enumOids.arrayOids.length === 0) {
-        return Promise.resolve(this._refreshDynamicOIDs(connection)).then(() => connection);
+      await this._refreshDynamicOIDs(connection);
     }
-      return connection;
-    }).then(connection => {
     // Don't let a Postgres restart (or error) to take down the whole app
     connection.on('error', error => {
       connection._invalid = true;
       debug(`connection error ${error.code || error.message}`);
       this.pool.destroy(connection);
     });
+
     return connection;
-    });
   }
 
-  disconnect(connection) {
+  async disconnect(connection) {
     if (connection._ending) {
       debug('connection tried to disconnect but was already at ENDING state');
-      return Promise.resolve();
+      return;
     }
 
-    return promisify(callback => connection.end(callback))();
+    return await promisify(callback => connection.end(callback))();
   }
 
   validate(connection) {
     return !connection._invalid && !connection._ending;
   }
 
-  _refreshDynamicOIDs(connection) {
+  async _refreshDynamicOIDs(connection) {
     const databaseVersion = this.sequelize.options.databaseVersion;
     const supportedVersion = '8.3.0';
 
     // Check for supported version
     if ( (databaseVersion && semver.gte(databaseVersion, supportedVersion)) === false) {
-      return Promise.resolve();
+      return;
     }
 
-    // Refresh dynamic OIDs for some types
-    // These include Geometry / Geography / HStore / Enum / Citext / Range
-    return (connection || this.sequelize).query(
+    const results = await (connection || this.sequelize).query(
       'WITH ranges AS (' +
       '  SELECT pg_range.rngtypid, pg_type.typname AS rngtypname,' +
       '         pg_type.typarray AS rngtyparray, pg_range.rngsubtype' +
@@ -273,7 +268,8 @@ class ConnectionManager extends AbstractConnectionManager {
       '       ranges.rngtypname, ranges.rngtypid, ranges.rngtyparray' +
       '  FROM pg_type LEFT OUTER JOIN ranges ON pg_type.oid = ranges.rngsubtype' +
       ' WHERE (pg_type.typtype IN(\'b\', \'e\'));'
-    ).then(results => {
+    );
+
     let result = Array.isArray(results) ? results.pop() : results;
 
     // When searchPath is prepended then two statements are executed and the result is
@@ -312,7 +308,6 @@ class ConnectionManager extends AbstractConnectionManager {
     this.enumOids = newEnumOids;
 
     this.refreshTypeParser(dataTypes.postgres);
-    });
   }
 
   _clearDynamicOIDs() {

lib/dialects/postgres/query-interface.js

@@ -26,7 +26,7 @@ const _ = require('lodash');
    * @returns {Promise}
    * @private
    */
-function ensureEnums(qi, tableName, attributes, options, model) {
+async function ensureEnums(qi, tableName, attributes, options, model) {
   const keys = Object.keys(attributes);
   const keyLen = keys.length;
 
@@ -50,7 +50,7 @@ function ensureEnums(qi, tableName, attributes, options, model) {
     }
   }
 
-  return Promise.all(promises).then(results => {
+  const results = await Promise.all(promises);
   promises = [];
   let enumIdx = 0;
 
@@ -142,16 +142,14 @@ function ensureEnums(qi, tableName, attributes, options, model) {
     }
   }
 
-    return promises
-      .reduce((promise, asyncFunction) => promise.then(asyncFunction), Promise.resolve())
-      .then(result => {
+  const result = await promises
+    .reduce(async (promise, asyncFunction) => await asyncFunction(await promise), Promise.resolve());
+
   // If ENUM processed, then refresh OIDs
   if (promises.length) {
-          return Promise.resolve(qi.sequelize.dialect.connectionManager._refreshDynamicOIDs()).then(() => result);
+    await qi.sequelize.dialect.connectionManager._refreshDynamicOIDs();
   }
   return result;
-      });
-  });
 }
 
 

lib/dialects/postgres/query.js

@@ -47,7 +47,7 @@ class Query extends AbstractQuery {
     return [sql, bindParam];
   }
 
-  run(sql, parameters) {
+  async run(sql, parameters) {
     const { connection } = this;
 
     if (!_.isEmpty(this.options.searchPath)) {
@@ -73,7 +73,11 @@ class Query extends AbstractQuery {
 
     const complete = this._logQuery(sql, debug, parameters);
 
-    return query.catch(err => {
+    let queryResult;
+
+    try {
+      queryResult = await query;
+    } catch (err) {
       // set the client so that it will be reaped if the connection resets while executing
       if (err.code === 'ECONNRESET') {
         connection._invalid = true;
@@ -82,8 +86,8 @@ class Query extends AbstractQuery {
       err.sql = sql;
       err.parameters = parameters;
       throw this.formatError(err);
-    })
-      .then(queryResult => {
+    }
+
     complete();
 
     let rows = Array.isArray(queryResult)
@@ -282,7 +286,6 @@ class Query extends AbstractQuery {
       return [rows, queryResult];
     }
     return rows;
-      });
   }
 
   formatError(err) {