324 lines
13 KiB
JavaScript
324 lines
13 KiB
JavaScript
"use strict";
|
||
Object.defineProperty(exports, "__esModule", { value: true });
|
||
exports.Parser = void 0;
|
||
const messages_1 = require("./messages");
|
||
const buffer_reader_1 = require("./buffer-reader");
|
||
// every message is prefixed with a single bye
|
||
const CODE_LENGTH = 1;
|
||
// every message has an int32 length which includes itself but does
|
||
// NOT include the code in the length
|
||
const LEN_LENGTH = 4;
|
||
const HEADER_LENGTH = CODE_LENGTH + LEN_LENGTH;
|
||
// A placeholder for a `BackendMessage`’s length value that will be set after construction.
|
||
const LATEINIT_LENGTH = -1;
|
||
const emptyBuffer = Buffer.allocUnsafe(0);
|
||
class Parser {
|
||
constructor(opts) {
|
||
this.buffer = emptyBuffer;
|
||
this.bufferLength = 0;
|
||
this.bufferOffset = 0;
|
||
this.reader = new buffer_reader_1.BufferReader();
|
||
if ((opts === null || opts === void 0 ? void 0 : opts.mode) === 'binary') {
|
||
throw new Error('Binary mode not supported yet');
|
||
}
|
||
this.mode = (opts === null || opts === void 0 ? void 0 : opts.mode) || 'text';
|
||
}
|
||
parse(buffer, callback) {
|
||
this.mergeBuffer(buffer);
|
||
const bufferFullLength = this.bufferOffset + this.bufferLength;
|
||
let offset = this.bufferOffset;
|
||
while (offset + HEADER_LENGTH <= bufferFullLength) {
|
||
// code is 1 byte long - it identifies the message type
|
||
const code = this.buffer[offset];
|
||
// length is 1 Uint32BE - it is the length of the message EXCLUDING the code
|
||
const length = this.buffer.readUInt32BE(offset + CODE_LENGTH);
|
||
const fullMessageLength = CODE_LENGTH + length;
|
||
if (fullMessageLength + offset <= bufferFullLength) {
|
||
const message = this.handlePacket(offset + HEADER_LENGTH, code, length, this.buffer);
|
||
callback(message);
|
||
offset += fullMessageLength;
|
||
}
|
||
else {
|
||
break;
|
||
}
|
||
}
|
||
if (offset === bufferFullLength) {
|
||
// No more use for the buffer
|
||
this.buffer = emptyBuffer;
|
||
this.bufferLength = 0;
|
||
this.bufferOffset = 0;
|
||
}
|
||
else {
|
||
// Adjust the cursors of remainingBuffer
|
||
this.bufferLength = bufferFullLength - offset;
|
||
this.bufferOffset = offset;
|
||
}
|
||
}
|
||
mergeBuffer(buffer) {
|
||
if (this.bufferLength > 0) {
|
||
const newLength = this.bufferLength + buffer.byteLength;
|
||
const newFullLength = newLength + this.bufferOffset;
|
||
if (newFullLength > this.buffer.byteLength) {
|
||
// We can't concat the new buffer with the remaining one
|
||
let newBuffer;
|
||
if (newLength <= this.buffer.byteLength && this.bufferOffset >= this.bufferLength) {
|
||
// We can move the relevant part to the beginning of the buffer instead of allocating a new buffer
|
||
newBuffer = this.buffer;
|
||
}
|
||
else {
|
||
// Allocate a new larger buffer
|
||
let newBufferLength = this.buffer.byteLength * 2;
|
||
while (newLength >= newBufferLength) {
|
||
newBufferLength *= 2;
|
||
}
|
||
newBuffer = Buffer.allocUnsafe(newBufferLength);
|
||
}
|
||
// Move the remaining buffer to the new one
|
||
this.buffer.copy(newBuffer, 0, this.bufferOffset, this.bufferOffset + this.bufferLength);
|
||
this.buffer = newBuffer;
|
||
this.bufferOffset = 0;
|
||
}
|
||
// Concat the new buffer with the remaining one
|
||
buffer.copy(this.buffer, this.bufferOffset + this.bufferLength);
|
||
this.bufferLength = newLength;
|
||
}
|
||
else {
|
||
this.buffer = buffer;
|
||
this.bufferOffset = 0;
|
||
this.bufferLength = buffer.byteLength;
|
||
}
|
||
}
|
||
handlePacket(offset, code, length, bytes) {
|
||
const { reader } = this;
|
||
// NOTE: This undesirably retains the buffer in `this.reader` if the `parse*Message` calls below throw. However, those should only throw in the case of a protocol error, which normally results in the reader being discarded.
|
||
reader.setBuffer(offset, bytes);
|
||
let message;
|
||
switch (code) {
|
||
case 50 /* MessageCodes.BindComplete */:
|
||
message = messages_1.bindComplete;
|
||
break;
|
||
case 49 /* MessageCodes.ParseComplete */:
|
||
message = messages_1.parseComplete;
|
||
break;
|
||
case 51 /* MessageCodes.CloseComplete */:
|
||
message = messages_1.closeComplete;
|
||
break;
|
||
case 110 /* MessageCodes.NoData */:
|
||
message = messages_1.noData;
|
||
break;
|
||
case 115 /* MessageCodes.PortalSuspended */:
|
||
message = messages_1.portalSuspended;
|
||
break;
|
||
case 99 /* MessageCodes.CopyDone */:
|
||
message = messages_1.copyDone;
|
||
break;
|
||
case 87 /* MessageCodes.ReplicationStart */:
|
||
message = messages_1.replicationStart;
|
||
break;
|
||
case 73 /* MessageCodes.EmptyQuery */:
|
||
message = messages_1.emptyQuery;
|
||
break;
|
||
case 68 /* MessageCodes.DataRow */:
|
||
message = parseDataRowMessage(reader);
|
||
break;
|
||
case 67 /* MessageCodes.CommandComplete */:
|
||
message = parseCommandCompleteMessage(reader);
|
||
break;
|
||
case 90 /* MessageCodes.ReadyForQuery */:
|
||
message = parseReadyForQueryMessage(reader);
|
||
break;
|
||
case 65 /* MessageCodes.NotificationResponse */:
|
||
message = parseNotificationMessage(reader);
|
||
break;
|
||
case 82 /* MessageCodes.AuthenticationResponse */:
|
||
message = parseAuthenticationResponse(reader, length);
|
||
break;
|
||
case 83 /* MessageCodes.ParameterStatus */:
|
||
message = parseParameterStatusMessage(reader);
|
||
break;
|
||
case 75 /* MessageCodes.BackendKeyData */:
|
||
message = parseBackendKeyData(reader);
|
||
break;
|
||
case 69 /* MessageCodes.ErrorMessage */:
|
||
message = parseErrorMessage(reader, 'error');
|
||
break;
|
||
case 78 /* MessageCodes.NoticeMessage */:
|
||
message = parseErrorMessage(reader, 'notice');
|
||
break;
|
||
case 84 /* MessageCodes.RowDescriptionMessage */:
|
||
message = parseRowDescriptionMessage(reader);
|
||
break;
|
||
case 116 /* MessageCodes.ParameterDescriptionMessage */:
|
||
message = parseParameterDescriptionMessage(reader);
|
||
break;
|
||
case 71 /* MessageCodes.CopyIn */:
|
||
message = parseCopyInMessage(reader);
|
||
break;
|
||
case 72 /* MessageCodes.CopyOut */:
|
||
message = parseCopyOutMessage(reader);
|
||
break;
|
||
case 100 /* MessageCodes.CopyData */:
|
||
message = parseCopyData(reader, length);
|
||
break;
|
||
default:
|
||
return new messages_1.DatabaseError('received invalid response: ' + code.toString(16), length, 'error');
|
||
}
|
||
reader.setBuffer(0, emptyBuffer);
|
||
message.length = length;
|
||
return message;
|
||
}
|
||
}
|
||
exports.Parser = Parser;
|
||
const parseReadyForQueryMessage = (reader) => {
|
||
const status = reader.string(1);
|
||
return new messages_1.ReadyForQueryMessage(LATEINIT_LENGTH, status);
|
||
};
|
||
const parseCommandCompleteMessage = (reader) => {
|
||
const text = reader.cstring();
|
||
return new messages_1.CommandCompleteMessage(LATEINIT_LENGTH, text);
|
||
};
|
||
const parseCopyData = (reader, length) => {
|
||
const chunk = reader.bytes(length - 4);
|
||
return new messages_1.CopyDataMessage(LATEINIT_LENGTH, chunk);
|
||
};
|
||
const parseCopyInMessage = (reader) => parseCopyMessage(reader, 'copyInResponse');
|
||
const parseCopyOutMessage = (reader) => parseCopyMessage(reader, 'copyOutResponse');
|
||
const parseCopyMessage = (reader, messageName) => {
|
||
const isBinary = reader.byte() !== 0;
|
||
const columnCount = reader.int16();
|
||
const message = new messages_1.CopyResponse(LATEINIT_LENGTH, messageName, isBinary, columnCount);
|
||
for (let i = 0; i < columnCount; i++) {
|
||
message.columnTypes[i] = reader.int16();
|
||
}
|
||
return message;
|
||
};
|
||
const parseNotificationMessage = (reader) => {
|
||
const processId = reader.int32();
|
||
const channel = reader.cstring();
|
||
const payload = reader.cstring();
|
||
return new messages_1.NotificationResponseMessage(LATEINIT_LENGTH, processId, channel, payload);
|
||
};
|
||
const parseRowDescriptionMessage = (reader) => {
|
||
const fieldCount = reader.int16();
|
||
const message = new messages_1.RowDescriptionMessage(LATEINIT_LENGTH, fieldCount);
|
||
for (let i = 0; i < fieldCount; i++) {
|
||
message.fields[i] = parseField(reader);
|
||
}
|
||
return message;
|
||
};
|
||
const parseField = (reader) => {
|
||
const name = reader.cstring();
|
||
const tableID = reader.uint32();
|
||
const columnID = reader.int16();
|
||
const dataTypeID = reader.uint32();
|
||
const dataTypeSize = reader.int16();
|
||
const dataTypeModifier = reader.int32();
|
||
const mode = reader.int16() === 0 ? 'text' : 'binary';
|
||
return new messages_1.Field(name, tableID, columnID, dataTypeID, dataTypeSize, dataTypeModifier, mode);
|
||
};
|
||
const parseParameterDescriptionMessage = (reader) => {
|
||
const parameterCount = reader.int16();
|
||
const message = new messages_1.ParameterDescriptionMessage(LATEINIT_LENGTH, parameterCount);
|
||
for (let i = 0; i < parameterCount; i++) {
|
||
message.dataTypeIDs[i] = reader.int32();
|
||
}
|
||
return message;
|
||
};
|
||
const parseDataRowMessage = (reader) => {
|
||
const fieldCount = reader.int16();
|
||
const fields = new Array(fieldCount);
|
||
for (let i = 0; i < fieldCount; i++) {
|
||
const len = reader.int32();
|
||
// a -1 for length means the value of the field is null
|
||
fields[i] = len === -1 ? null : reader.string(len);
|
||
}
|
||
return new messages_1.DataRowMessage(LATEINIT_LENGTH, fields);
|
||
};
|
||
const parseParameterStatusMessage = (reader) => {
|
||
const name = reader.cstring();
|
||
const value = reader.cstring();
|
||
return new messages_1.ParameterStatusMessage(LATEINIT_LENGTH, name, value);
|
||
};
|
||
const parseBackendKeyData = (reader) => {
|
||
const processID = reader.int32();
|
||
const secretKey = reader.int32();
|
||
return new messages_1.BackendKeyDataMessage(LATEINIT_LENGTH, processID, secretKey);
|
||
};
|
||
const parseAuthenticationResponse = (reader, length) => {
|
||
const code = reader.int32();
|
||
// TODO(bmc): maybe better types here
|
||
const message = {
|
||
name: 'authenticationOk',
|
||
length,
|
||
};
|
||
switch (code) {
|
||
case 0: // AuthenticationOk
|
||
break;
|
||
case 3: // AuthenticationCleartextPassword
|
||
if (message.length === 8) {
|
||
message.name = 'authenticationCleartextPassword';
|
||
}
|
||
break;
|
||
case 5: // AuthenticationMD5Password
|
||
if (message.length === 12) {
|
||
message.name = 'authenticationMD5Password';
|
||
const salt = reader.bytes(4);
|
||
return new messages_1.AuthenticationMD5Password(LATEINIT_LENGTH, salt);
|
||
}
|
||
break;
|
||
case 10: // AuthenticationSASL
|
||
{
|
||
message.name = 'authenticationSASL';
|
||
message.mechanisms = [];
|
||
let mechanism;
|
||
do {
|
||
mechanism = reader.cstring();
|
||
if (mechanism) {
|
||
message.mechanisms.push(mechanism);
|
||
}
|
||
} while (mechanism);
|
||
}
|
||
break;
|
||
case 11: // AuthenticationSASLContinue
|
||
message.name = 'authenticationSASLContinue';
|
||
message.data = reader.string(length - 8);
|
||
break;
|
||
case 12: // AuthenticationSASLFinal
|
||
message.name = 'authenticationSASLFinal';
|
||
message.data = reader.string(length - 8);
|
||
break;
|
||
default:
|
||
throw new Error('Unknown authenticationOk message type ' + code);
|
||
}
|
||
return message;
|
||
};
|
||
const parseErrorMessage = (reader, name) => {
|
||
const fields = {};
|
||
let fieldType = reader.string(1);
|
||
while (fieldType !== '\0') {
|
||
fields[fieldType] = reader.cstring();
|
||
fieldType = reader.string(1);
|
||
}
|
||
const messageValue = fields.M;
|
||
const message = name === 'notice'
|
||
? new messages_1.NoticeMessage(LATEINIT_LENGTH, messageValue)
|
||
: new messages_1.DatabaseError(messageValue, LATEINIT_LENGTH, name);
|
||
message.severity = fields.S;
|
||
message.code = fields.C;
|
||
message.detail = fields.D;
|
||
message.hint = fields.H;
|
||
message.position = fields.P;
|
||
message.internalPosition = fields.p;
|
||
message.internalQuery = fields.q;
|
||
message.where = fields.W;
|
||
message.schema = fields.s;
|
||
message.table = fields.t;
|
||
message.column = fields.c;
|
||
message.dataType = fields.d;
|
||
message.constraint = fields.n;
|
||
message.file = fields.F;
|
||
message.line = fields.L;
|
||
message.routine = fields.R;
|
||
return message;
|
||
};
|
||
//# sourceMappingURL=parser.js.map
|