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test-send-and-receive-large-packets.js
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test-send-and-receive-large-packets.js
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var assert = require('assert');
var common = require('../../common');
var crypto = require('crypto');
common.getTestConnection(function (err, connection) {
assert.ifError(err);
getMaxAllowedPacket(connection);
});
var oldMaxAllowedPacket;
function getMaxAllowedPacket(connection) {
connection.query('SHOW VARIABLES WHERE Variable_name = ?', ['max_allowed_packet'], function (err, rows) {
assert.ifError(err);
oldMaxAllowedPacket = Number(rows[0].Value);
increaseMaxAllowedPacketIfNeeded(connection);
});
}
function increaseMaxAllowedPacketIfNeeded(connection) {
// Our test generates a SQL query a few bytes larger than 16 MB, but lets
// leave a little margin:
var minMaxAllowedPacket = 20 * 1024 * 1024;
var newMaxAllowedPacket = (oldMaxAllowedPacket < minMaxAllowedPacket)
? minMaxAllowedPacket
: oldMaxAllowedPacket;
connection.query('SET GLOBAL max_allowed_packet = ?', [newMaxAllowedPacket], function (err, rows) {
assert.ifError(err);
// We need to re-connect for this change to take effect, bah
connection.end();
connection = common.createConnection();
// We need to wait for the re-connect to happen before starting the actual
// test. That's because our buffer to hex shim in 0.4.x takes ~12 sec on
// TravisCI, causing a MySQL connection timeout otherwise.
connection.connect(function (err) {
assert.ifError(err);
triggerLargeQueryAndResponsePackets(connection);
});
});
}
var length = (Math.pow(256, 3) / 2) + 10; // Half, because of hex encoding
var random = crypto.pseudoRandomBytes || crypto.randomBytes; // Depends on node.js version
var table = 'large_packet_test';
function triggerLargeQueryAndResponsePackets(connection) {
random(length, function (err, buf) {
assert.ifError(err);
assert.equal(buf.length, length);
common.useTestDb(connection);
connection.query([
'CREATE TEMPORARY TABLE ?? (',
'`id` int(11) unsigned NOT NULL AUTO_INCREMENT,',
'`bb` longblob NOT NULL,',
'PRIMARY KEY (`id`)',
') ENGINE=InnoDB DEFAULT CHARSET=utf8'
].join('\n'), [table], assert.ifError);
connection.query('INSERT INTO ?? SET ?', [table, {bb: buf}], assert.ifError);
connection.query('SELECT `id`, `bb` FROM ??', [table], function (err, rows) {
assert.ifError(err);
connection.query('SET GLOBAL max_allowed_packet = ?', [oldMaxAllowedPacket], assert.ifError);
connection.end(function (err) {
assert.ifError(err);
assert.equal(rows.length, 1);
assert.equal(rows[0].bb.length, buf.length);
assert.equal(rows[0].bb.toString('base64'), buf.toString('base64'));
});
});
});
}