116 lines
3.4 KiB
JavaScript
116 lines
3.4 KiB
JavaScript
'use strict';
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// http://dev.mysql.com/doc/internals/en/query-event.html
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const keys = {
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FLAGS2: 0,
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SQL_MODE: 1,
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CATALOG: 2,
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AUTO_INCREMENT: 3,
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CHARSET: 4,
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TIME_ZONE: 5,
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CATALOG_NZ: 6,
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LC_TIME_NAMES: 7,
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CHARSET_DATABASE: 8,
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TABLE_MAP_FOR_UPDATE: 9,
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MASTER_DATA_WRITTEN: 10,
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INVOKERS: 11,
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UPDATED_DB_NAMES: 12,
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MICROSECONDS: 3
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};
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module.exports = function parseStatusVars(buffer) {
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const result = {};
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let offset = 0;
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let key, length, prevOffset;
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while (offset < buffer.length) {
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key = buffer[offset++];
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switch (key) {
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case keys.FLAGS2:
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result.flags = buffer.readUInt32LE(offset);
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offset += 4;
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break;
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case keys.SQL_MODE:
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// value is 8 bytes, but all dcumented flags are in first 4 bytes
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result.sqlMode = buffer.readUInt32LE(offset);
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offset += 8;
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break;
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case keys.CATALOG:
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length = buffer[offset++];
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result.catalog = buffer.toString('utf8', offset, offset + length);
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offset += length + 1; // null byte after string
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break;
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case keys.CHARSET:
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result.clientCharset = buffer.readUInt16LE(offset);
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result.connectionCollation = buffer.readUInt16LE(offset + 2);
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result.serverCharset = buffer.readUInt16LE(offset + 4);
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offset += 6;
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break;
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case keys.TIME_ZONE:
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length = buffer[offset++];
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result.timeZone = buffer.toString('utf8', offset, offset + length);
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offset += length; // no null byte
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break;
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case keys.CATALOG_NZ:
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length = buffer[offset++];
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result.catalogNz = buffer.toString('utf8', offset, offset + length);
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offset += length; // no null byte
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break;
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case keys.LC_TIME_NAMES:
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result.lcTimeNames = buffer.readUInt16LE(offset);
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offset += 2;
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break;
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case keys.CHARSET_DATABASE:
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result.schemaCharset = buffer.readUInt16LE(offset);
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offset += 2;
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break;
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case keys.TABLE_MAP_FOR_UPDATE:
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result.mapForUpdate1 = buffer.readUInt32LE(offset);
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result.mapForUpdate2 = buffer.readUInt32LE(offset + 4);
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offset += 8;
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break;
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case keys.MASTER_DATA_WRITTEN:
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result.masterDataWritten = buffer.readUInt32LE(offset);
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offset += 4;
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break;
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case keys.INVOKERS:
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length = buffer[offset++];
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result.invokerUsername = buffer.toString(
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'utf8',
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offset,
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offset + length
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);
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offset += length;
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length = buffer[offset++];
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result.invokerHostname = buffer.toString(
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'utf8',
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offset,
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offset + length
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);
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offset += length;
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break;
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case keys.UPDATED_DB_NAMES:
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length = buffer[offset++];
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// length - number of null-terminated strings
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result.updatedDBs = []; // we'll store them as array here
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for (; length; --length) {
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prevOffset = offset;
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// fast forward to null terminating byte
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while (buffer[offset++] && offset < buffer.length) {
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// empty body, everything inside while condition
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}
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result.updatedDBs.push(
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buffer.toString('utf8', prevOffset, offset - 1)
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);
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}
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break;
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case keys.MICROSECONDS:
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result.microseconds =
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// REVIEW: INVALID UNKNOWN VARIABLE!
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buffer.readInt16LE(offset) + (buffer[offset + 2] << 16);
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offset += 3;
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}
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}
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return result;
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};
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