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"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;
};
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