-
-
Notifications
You must be signed in to change notification settings - Fork 615
/
execute.js
203 lines (190 loc) · 6.79 KB
/
execute.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
'use strict';
const CursorType = require('../constants/cursor');
const CommandCodes = require('../constants/commands');
const FieldFlags = require('../constants/field_flags.js');
const Types = require('../constants/types');
const Packet = require('../packets/packet');
const CharsetToEncoding = require('../constants/charset_encodings.js');
function isJSON(value) {
return (
Array.isArray(value) ||
value.constructor === Object ||
(typeof value.toJSON === 'function' && !Buffer.isBuffer(value))
);
}
/**
* Converts a value to an object describing type, String/Buffer representation and length
* @param {*} value
*/
function toParameter(value, encoding, timezone, parameterHints) {
let type = parameterHints.columnType;
let length;
let writer = function(value) {
// eslint-disable-next-line no-invalid-this
return Packet.prototype.writeLengthCodedString.call(this, value, encoding);
};
const unsigned = parameterHints.flags & FieldFlags.UNSIGNED;
if (value !== null) {
if (typeof value === 'undefined') {
throw new TypeError('Bind parameters must not contain undefined');
}
// currently exception for Date and plain object input parameters - even if statement expects another type we'll still send date/stringified json
// this might change in the future
if (Object.prototype.toString.call(value) === '[object Date]') {
type = Types.DATETIME;
length = 12;
writer = function(value) {
// eslint-disable-next-line no-invalid-this
return Packet.prototype.writeDate.call(this, value, timezone);
};
return { value, type, length, writer };
}
if (isJSON(value)) {
value = JSON.stringify(value);
type = Types.JSON;
length = Packet.lengthCodedStringLength(value, encoding);
return { value, type, length, writer };
}
if (Buffer.isBuffer(value)) {
length = Packet.lengthCodedNumberLength(value.length) + value.length;
writer = Packet.prototype.writeLengthCodedBuffer;
type = Types.VAR_STRING;
return { value, type, length, writer };
}
switch(parameterHints.columnType) {
case Types.TINY:
value = value | 0;
length = 1;
writer = unsigned ? Packet.prototype.writeInt8 : Packet.prototype.writeUInt8;
break;
case Types.YEAR:
case Types.SHORT:
value = value | 0;
length = 2;
writer = unsigned ? Packet.prototype.writeInt16 : Packet.prototype.writeSInt16;
break;
case Types.LONG:
case Types.INT24: // in binary protocol int24 is encoded in 4 bytes int32
value = value | 0;
length = 4;
writer = unsigned ? Packet.prototype.writeInt32() : Packet.prototype.writeSInt32();
break;
case Types.DATETIME:
if (!(Object.prototype.toString.call(value) === '[object Date]')) {
length = 12;
writer = function(value) {
// eslint-disable-next-line no-invalid-this
return Packet.prototype.writeDate.call(this, value, timezone);
};
} else {
// if parameter is not a date serialize it as string by default
value = value.toString();
type = Types.VAR_STRING;
}
break;
case Types.FLOAT:
length = 4;
writer = Packet.prototype.writeFloat;
break;
case Types.DOUBLE:
length = 8;
writer = Packet.prototype.writeDouble;
break;
case Types.JSON:
value = JSON.stringify(value);
type = parameterHints.type;
break;
case Types.LONGLONG:
// this should also cover anything that serializes to a string ( BigInt etc )
type = Types.VAR_STRING;
value = value.toString();
break;
default:
type = Types.VAR_STRING;
value = value.toString();
}
} else {
value = '';
type = Types.NULL;
}
if (!length) {
length = Packet.lengthCodedStringLength(value, encoding);
}
return { value, type, length, writer };
}
class Execute {
constructor(statement, parameters, charsetNumber, timezone) {
this.statement = statement;
this.parameters = parameters;
this.encoding = CharsetToEncoding[charsetNumber];
this.timezone = timezone;
}
toPacket() {
if ((this.statement.parameters.length > 0 && !this.parameters) || (this.parameters && this.parameters.length !== this.statement.parameters.length)) {
throw new TypeError(`Incorrect number of bind parameters, expected ${this.statement.parameters.length} but supplied ${this.parameters.length}`);
}
// TODO: don't try to calculate packet length in advance, allocate some big buffer in advance (header + 256 bytes?)
// and copy + reallocate if not enough
// 0 + 4 - length, seqId
// 4 + 1 - COM_EXECUTE
// 5 + 4 - stmtId
// 9 + 1 - flags
// 10 + 4 - iteration-count (always 1)
let length = 14;
let parameters;
if (this.parameters && this.parameters.length > 0) {
length += Math.floor((this.parameters.length + 7) / 8);
length += 1; // new-params-bound-flag
length += 2 * this.parameters.length; // type byte for each parameter if new-params-bound-flag is set
parameters = this.parameters.map((value, index) =>
toParameter(value, this.encoding, this.timezone, this.statement.parameters[index])
);
length += parameters.reduce(
(accumulator, parameter) => accumulator + parameter.length,
0
);
}
const buffer = Buffer.allocUnsafe(length);
const packet = new Packet(0, buffer, 0, length);
packet.offset = 4;
packet.writeInt8(CommandCodes.STMT_EXECUTE);
packet.writeInt32(this.statement.id);
packet.writeInt8(CursorType.NO_CURSOR); // flags
packet.writeInt32(1); // iteration-count, always 1
if (parameters) {
let bitmap = 0;
let bitValue = 1;
parameters.forEach(parameter => {
if (parameter.type === Types.NULL) {
bitmap += bitValue;
}
bitValue *= 2;
if (bitValue === 256) {
packet.writeInt8(bitmap);
bitmap = 0;
bitValue = 1;
}
});
if (bitValue !== 1) {
packet.writeInt8(bitmap);
}
// TODO: explain meaning of the flag
// afaik, if set n*2 bytes with type of parameter are sent before parameters
// if not, previous execution types are used (TODO prooflink)
packet.writeInt8(1); // new-params-bound-flag
// Write parameter types
parameters.forEach(parameter => {
packet.writeInt8(parameter.type); // field type
packet.writeInt8(0); // parameter flag
});
// Write parameter values
parameters.forEach(parameter => {
if (parameter.type !== Types.NULL) {
parameter.writer.call(packet, parameter.value);
}
});
}
return packet;
}
}
module.exports = Execute;