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fix pool on acquire event cause MaxListenersExceededWarning (#854)

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before: every query need to register pool on acquire event to specify queryFormat based on payload type
will cause MaxListenersExceededWarning

after:
from https://www.npmjs.com/package/mysql#pooling-connections

pool.query is a shortcut for pool.getConnection() -> connection.query() -> connection.release()

so use pool.getConnection and then
set queryFormat before query method be called

Co-authored-by: Dave Conway-Jones <dceejay@users.noreply.github.com>
This commit is contained in:
saknarak 2021-11-18 15:50:37 +07:00 committed by GitHub
parent a2737c2685
commit 16f85c85a8
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 43 additions and 33 deletions
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76
storage/mysql/68-mysql.js
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@ -112,43 +112,41 @@ module.exports = function(RED) {
if (node.mydbConfig.connected) {
if (typeof msg.topic === 'string') {
//console.log("query:",msg.topic);
var bind = [];
if (Array.isArray(msg.payload)) {
bind = msg.payload;
node.mydbConfig.pool.on('acquire', function(connection) {
connection.config.queryFormat = null;
});
}
else if (typeof msg.payload === 'object' && msg.payload !== null) {
bind = msg.payload;
node.mydbConfig.pool.on('acquire', function(connection) {
connection.config.queryFormat = function(query, values) {
if (!values) {
return query;
}
return query.replace(/\:(\w+)/g, function(txt, key) {
if (values.hasOwnProperty(key)) {
return this.escape(values[key]);
}
return txt;
}.bind(this));
};
});
}
node.mydbConfig.pool.query(msg.topic, bind, function(err, rows) {
node.mydbConfig.pool.getConnection(function (err, conn) {
if (err) {
status = {fill:"red",shape:"ring",text:RED._("mysql.status.error")+": "+err.code};
conn.release()
status = { fill: "red", shape: "ring", text: RED._("mysql.status.error") + ": " + err.code };
node.status(status);
node.error(err,msg);
node.error(err, msg);
if (done) { done(); }
return
}
else {
msg.payload = rows;
send(msg);
status = {fill:"green",shape:"dot",text:RED._("mysql.status.ok")};
node.status(status);
var bind = [];
if (Array.isArray(msg.payload)) {
bind = msg.payload;
}
if (done) { done(); }
});
else if (typeof msg.payload === 'object' && msg.payload !== null) {
bind = msg.payload;
}
conn.config.queryFormat = Array.isArray(msg.payload) ? null : customQueryFormat
conn.query(msg.topic, bind, function (err, rows) {
conn.release()
if (err) {
status = { fill: "red", shape: "ring", text: RED._("mysql.status.error") + ": " + err.code };
node.status(status);
node.error(err, msg);
}
else {
msg.payload = rows;
send(msg);
status = { fill: "green", shape: "dot", text: RED._("mysql.status.ok") };
node.status(status);
}
if (done) { done(); }
});
})
}
else {
if (typeof msg.topic !== 'string') { node.error("msg.topic : "+RED._("mysql.errors.notstring")); done(); }
@ -178,3 +176,15 @@ module.exports = function(RED) {
}
RED.nodes.registerType("mysql",MysqlDBNodeIn);
}
function customQueryFormat(query, values) {
if (!values) {
return query;
}
return query.replace(/\:(\w+)/g, function(txt, key) {
if (values.hasOwnProperty(key)) {
return this.escape(values[key]);
}
return txt;
}.bind(this));
}