Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import {RESP} from './constants';
import {RespAttributes, RespPush} from './extensions';
import type {IReader, IReaderResettable} from '@jsonjoy.com/buffers/lib';
import type {BinaryJsonDecoder, PackValue} from '../types';
import {isUtf8} from '@jsonjoy.com/buffers/lib/utf8/isUtf8';
export class RespDecoder<R extends IReader & IReaderResettable = IReader & IReaderResettable>
implements BinaryJsonDecoder
{
/**
* When set to true, the decoder will attempt to decode RESP Bulk strings
* (which are binary strings, i.e. Uint8Array) as UTF-8 strings. If the
* string is not valid UTF-8, it will be returned as a Uint8Array.
*
* You can toggle this setting at any time, before each call to `decode()`
* or `read()`, or other methods.
*/
public tryUtf8 = false;
public constructor(public reader: R = new Reader() as any) {}
public read(uint8: Uint8Array): PackValue {
this.reader.reset(uint8);
return this.readAny() as PackValue;
}
/** @deprecated */
public decode(uint8: Uint8Array): unknown {
this.reader.reset(uint8);
return this.readAny();
}
// -------------------------------------------------------- Any value reading
public val(): unknown {
return this.readAny();
}
public readAny(): unknown {
const reader = this.reader;
const type = reader.u8();
switch (type) {
case RESP.INT:
return this.readInt();
case RESP.FLOAT:
return this.readFloat();
case RESP.STR_SIMPLE:
return this.readStrSimple();
case RESP.STR_BULK:
return this.readStrBulk();
case RESP.BOOL:
return this.readBool();
case RESP.NULL:
return reader.skip(2), null;
case RESP.OBJ:
return this.readObj();
case RESP.ARR:
return this.readArr();
case RESP.STR_VERBATIM:
return this.readStrVerbatim();
case RESP.PUSH:
return new RespPush(this.readArr() || []);
case RESP.BIG:
return this.readBigint();
case RESP.SET:
return this.readSet();
case RESP.ERR_SIMPLE:
return this.readErrSimple();
case RESP.ERR_BULK:
return this.readErrBulk();
case RESP.ATTR:
return new RespAttributes(this.readObj());
}
throw new Error('UNKNOWN_TYPE');
}
protected readLength(): number {
const reader = this.reader;
let number: number = 0;
while (true) {
const c = reader.u8();
if (c === RESP.R) return reader.skip(1), number;
number = number * 10 + (c - 48);
}
}
public readCmd(): [cmd: string, ...args: Uint8Array[]] {
const reader = this.reader;
const type = reader.u8();
Iif (type !== RESP.ARR) throw new Error('INVALID_COMMAND');
const c = reader.peak();
Iif (c === RESP.MINUS) throw new Error('INVALID_COMMAND');
const length = this.readLength();
Iif (length === 0) throw new Error('INVALID_COMMAND');
const cmd = this.readAsciiAsStrBulk().toUpperCase();
const args: [cmd: string, ...args: Uint8Array[]] = [cmd];
this.tryUtf8 = false;
for (let i = 1; i < length; i++) {
const type = reader.u8();
Iif (type !== RESP.STR_BULK) throw new Error('INVALID_COMMAND');
args.push(this.readStrBulk() as Uint8Array);
}
return args;
}
// ---------------------------------------------------------- Boolean reading
public readBool(): boolean {
const reader = this.reader;
const c = reader.u8();
reader.skip(2); // Skip "\r\n".
return c === 116; // t
}
// ----------------------------------------------------------- Number reading
public readInt(): number {
const reader = this.reader;
let negative = false;
let c = reader.u8();
let number: number = 0;
if (c === RESP.MINUS) {
negative = true;
} else if (c !== RESP.PLUS) number = c - 48;
while (true) {
c = reader.u8();
if (c === RESP.R) {
reader.skip(1); // Skip "\n".
return negative ? -number : number;
}
number = number * 10 + (c - 48);
}
}
public readFloat(): number {
const reader = this.reader;
const x = reader.x;
while (true) {
const c = reader.u8();
if (c !== RESP.R) continue;
const length = reader.x - x - 1;
reader.x = x;
const str = reader.ascii(length);
switch (length) {
case 3:
switch (str) {
case 'inf':
return reader.skip(2), Infinity;
case 'nan':
return reader.skip(2), NaN;
}
break;
case 4:
if (str === '-inf') {
return reader.skip(2), -Infinity;
}
break;
}
reader.skip(2); // Skip "\n".
return Number(str);
}
}
public readBigint(): bigint {
const reader = this.reader;
const x = reader.x;
while (true) {
const c = reader.u8();
if (c !== RESP.R) continue;
const length = reader.x - x;
reader.x = x;
const str = reader.ascii(length);
reader.skip(1); // Skip "\n".
return BigInt(str);
}
}
// ----------------------------------------------------------- String reading
public readStrSimple(): string {
const reader = this.reader;
const x = reader.x;
while (true) {
const c = reader.u8();
if (c !== RESP.R) continue;
const size = reader.x - x - 1;
reader.x = x;
const str = reader.utf8(size);
reader.skip(2); // Skip "\r\n".
return str;
}
}
public readStrBulk(): Uint8Array | string | null {
const reader = this.reader;
if (reader.peak() === RESP.MINUS) {
reader.skip(4); // Skip "-1\r\n".
return null;
}
const length = this.readLength();
let res: Uint8Array | string;
if (this.tryUtf8 && isUtf8(reader.uint8, reader.x, length)) res = reader.utf8(length);
else res = reader.buf(length);
reader.skip(2); // Skip "\r\n".
return res;
}
public readAsciiAsStrBulk(): string {
const reader = this.reader;
reader.skip(1); // Skip "$".
const length = this.readLength();
const buf = reader.ascii(length);
reader.skip(2); // Skip "\r\n".
return buf;
}
public readStrVerbatim(): string | Uint8Array {
const reader = this.reader;
const length = this.readLength();
const u32 = reader.u32();
const isTxt = u32 === 1954051130; // "txt:"
Eif (isTxt) {
const str = reader.utf8(length - 4);
reader.skip(2); // Skip "\r\n".
return str;
}
const buf = reader.buf(length - 4);
reader.skip(2); // Skip "\r\n".
return buf;
}
// ------------------------------------------------------------ Error reading
public readErrSimple(): Error {
const reader = this.reader;
const x = reader.x;
while (true) {
const c = reader.u8();
if (c !== RESP.R) continue;
const size = reader.x - x - 1;
reader.x = x;
const str = reader.utf8(size);
reader.skip(2); // Skip "\r\n".
return new Error(str);
}
}
public readErrBulk(): Error {
const reader = this.reader;
const length = this.readLength();
const message = reader.utf8(length);
reader.skip(2); // Skip "\r\n".
return new Error(message);
}
// ------------------------------------------------------------ Array reading
public readArr(): unknown[] | null {
const reader = this.reader;
const c = reader.peak();
if (c === RESP.MINUS) {
reader.skip(4); // Skip "-1\r\n".
return null;
}
const length = this.readLength();
const arr: unknown[] = [];
for (let i = 0; i < length; i++) arr.push(this.readAny());
return arr;
}
public readSet(): Set<unknown> {
const length = this.readLength();
const set = new Set();
for (let i = 0; i < length; i++) set.add(this.readAny());
return set;
}
// ----------------------------------------------------------- Object reading
public readObj(): Record<string, unknown> {
const length = this.readLength();
const obj: Record<string, unknown> = {};
for (let i = 0; i < length; i++) {
const key = this.readAny() + '';
obj[key] = this.readAny();
}
return obj;
}
// ----------------------------------------------------------------- Skipping
public skipN(n: number): void {
for (let i = 0; i < n; i++) this.skipAny();
}
public skipAny(): void {
const reader = this.reader;
const type = reader.u8();
switch (type) {
case RESP.INT:
return this.skipInt();
case RESP.FLOAT:
return this.skipFloat();
case RESP.STR_SIMPLE:
return this.skipStrSimple();
case RESP.STR_BULK:
return this.skipStrBulk();
case RESP.BOOL:
return this.skipBool();
case RESP.NULL:
return reader.skip(2);
case RESP.OBJ:
return this.skipObj();
case RESP.ARR:
return this.skipArr();
case RESP.STR_VERBATIM:
return this.skipStrVerbatim();
case RESP.PUSH:
return this.skipArr();
case RESP.BIG:
return this.skipBigint();
case RESP.SET:
return this.skipSet();
case RESP.ERR_SIMPLE:
return this.skipErrSimple();
case RESP.ERR_BULK:
return this.skipErrBulk();
case RESP.ATTR:
return this.skipObj();
}
throw new Error('UNKNOWN_TYPE');
}
public skipBool(): void {
this.reader.skip(3);
}
public skipInt(): void {
const reader = this.reader;
while (true) {
if (reader.u8() !== RESP.R) continue;
reader.skip(1); // Skip "\n".
return;
}
}
public skipFloat(): void {
const reader = this.reader;
while (true) {
if (reader.u8() !== RESP.R) continue;
reader.skip(1); // Skip "\n".
return;
}
}
public skipBigint(): void {
const reader = this.reader;
while (true) {
if (reader.u8() !== RESP.R) continue;
reader.skip(1); // Skip "\n".
return;
}
}
public skipStrSimple(): void {
const reader = this.reader;
while (true) {
if (reader.u8() !== RESP.R) continue;
reader.skip(1); // Skip "\n".
return;
}
}
public skipStrBulk(): void {
const reader = this.reader;
Iif (reader.peak() === RESP.MINUS) {
reader.skip(4); // Skip "-1\r\n".
return;
}
reader.skip(this.readLength() + 2); // Skip "\r\n".
}
public skipStrVerbatim(): void {
const length = this.readLength();
this.reader.skip(length + 2); // Skip "\r\n".
}
public skipErrSimple(): void {
const reader = this.reader;
while (true) {
if (reader.u8() !== RESP.R) continue;
reader.skip(1); // Skip "\n".
return;
}
}
public skipErrBulk(): void {
const length = this.readLength();
this.reader.skip(length + 2); // Skip "\r\n".
}
public skipArr(): void {
const reader = this.reader;
const c = reader.peak();
Iif (c === RESP.MINUS) {
reader.skip(4); // Skip "-1\r\n".
return;
}
const length = this.readLength();
for (let i = 0; i < length; i++) this.skipAny();
}
public skipSet(): void {
const length = this.readLength();
for (let i = 0; i < length; i++) this.skipAny();
}
public skipObj(): void {
const length = this.readLength();
for (let i = 0; i < length; i++) {
this.skipAny();
this.skipAny();
}
}
}
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