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SocketStream.ts
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238 lines (206 loc) · 6.48 KB
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'use strict';
import * as net from 'net';
// tslint:disable:no-var-requires no-require-imports member-ordering no-any
const uint64be = require('uint64be');
enum DataType {
string,
int32,
int64
}
export class SocketStream {
constructor(socket: net.Socket, buffer: Buffer) {
this.buffer = buffer;
this.socket = socket;
}
private socket: net.Socket;
public WriteInt32(num: number) {
this.WriteInt64(num);
}
public WriteInt64(num: number) {
const buffer = uint64be.encode(num);
this.socket.write(buffer);
}
public WriteString(value: string) {
const stringBuffer = new Buffer(value, 'utf-8');
this.WriteInt32(stringBuffer.length);
if (stringBuffer.length > 0) {
this.socket.write(stringBuffer);
}
}
public Write(buffer: Buffer) {
this.socket.write(buffer);
}
private buffer: Buffer;
private isInTransaction!: boolean;
private bytesRead: number = 0;
public get Buffer(): Buffer {
return this.buffer;
}
public BeginTransaction() {
this.isInTransaction = true;
this.bytesRead = 0;
this.ClearErrors();
}
public EndTransaction() {
this.isInTransaction = false;
this.buffer = this.buffer.slice(this.bytesRead);
this.bytesRead = 0;
this.ClearErrors();
}
public RollBackTransaction() {
this.isInTransaction = false;
this.bytesRead = 0;
this.ClearErrors();
}
public ClearErrors() {
this.hasInsufficientDataForReading = false;
}
private hasInsufficientDataForReading: boolean = false;
public get HasInsufficientDataForReading(): boolean {
return this.hasInsufficientDataForReading;
}
public toString(): string {
return this.buffer.toString();
}
public get Length(): number {
return this.buffer.length;
}
public Append(additionalData: Buffer) {
if (this.buffer.length === 0) {
this.buffer = additionalData;
return;
}
const newBuffer = new Buffer(this.buffer.length + additionalData.length);
this.buffer.copy(newBuffer);
additionalData.copy(newBuffer, this.buffer.length);
this.buffer = newBuffer;
}
private isSufficientDataAvailable(length: number): boolean {
if (this.buffer.length < this.bytesRead + length) {
this.hasInsufficientDataForReading = true;
}
return !this.hasInsufficientDataForReading;
}
public ReadByte(): number {
if (!this.isSufficientDataAvailable(1)) {
return null as any;
}
const value = this.buffer.slice(this.bytesRead, this.bytesRead + 1)[0];
if (this.isInTransaction) {
this.bytesRead += 1;
} else {
this.buffer = this.buffer.slice(1);
}
return value;
}
public ReadString(): string {
const byteRead = this.ReadByte();
if (this.HasInsufficientDataForReading) {
return null as any;
}
if (byteRead < 0) {
throw new Error('IOException() - Socket.ReadString failed to read string type;');
}
const type = new Buffer([byteRead]).toString();
let isUnicode = false;
switch (type) {
case 'N': // null string
return null as any;
case 'U':
isUnicode = true;
break;
case 'A': {
isUnicode = false;
break;
}
default: {
throw new Error(`IOException(); Socket.ReadString failed to parse unknown string type ${type}`);
}
}
const len = this.ReadInt32();
if (this.HasInsufficientDataForReading) {
return null as any;
}
if (!this.isSufficientDataAvailable(len)) {
return null as any;
}
const stringBuffer = this.buffer.slice(this.bytesRead, this.bytesRead + len);
if (this.isInTransaction) {
this.bytesRead = this.bytesRead + len;
} else {
this.buffer = this.buffer.slice(len);
}
return isUnicode ? stringBuffer.toString('utf-8') : stringBuffer.toString();
}
public ReadInt32(): number {
return this.ReadInt64();
}
public ReadInt64(): number {
if (!this.isSufficientDataAvailable(8)) {
return null as any;
}
const buf = this.buffer.slice(this.bytesRead, this.bytesRead + 8);
if (this.isInTransaction) {
this.bytesRead = this.bytesRead + 8;
} else {
this.buffer = this.buffer.slice(8);
}
return uint64be.decode(buf);
}
public ReadAsciiString(length: number): string {
if (!this.isSufficientDataAvailable(length)) {
return null as any;
}
const stringBuffer = this.buffer.slice(this.bytesRead, this.bytesRead + length);
if (this.isInTransaction) {
this.bytesRead = this.bytesRead + length;
} else {
this.buffer = this.buffer.slice(length);
}
return stringBuffer.toString('ascii');
}
private readValueInTransaction<T>(dataType: DataType): T {
let startedTransaction = false;
if (!this.isInTransaction) {
this.BeginTransaction();
startedTransaction = true;
}
let data: any;
switch (dataType) {
case DataType.string: {
data = this.ReadString();
break;
}
case DataType.int32: {
data = this.ReadInt32();
break;
}
case DataType.int64: {
data = this.ReadInt64();
break;
}
default: {
break;
}
}
if (this.HasInsufficientDataForReading) {
if (startedTransaction) {
this.RollBackTransaction();
}
return undefined as any;
}
if (startedTransaction) {
this.EndTransaction();
}
return data;
}
public readStringInTransaction(): string {
return this.readValueInTransaction<string>(DataType.string);
}
public readInt32InTransaction(): number {
return this.readValueInTransaction<number>(DataType.int32);
}
public readInt64InTransaction(): number {
return this.readValueInTransaction<number>(DataType.int64);
}
}