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import Parser = require("redis-parser");
const fengari = require("fengari");
import { DefaultRequest } from "../../server/default-request";
import { IRequest } from "../../server/request";
import { IRespCommand } from "../../resp/command/resp-command";
import { Logger } from "../../logger";
import { RespSerialize } from "../../resp/protocol/resp-serialize";
const { lua } = fengari;
export default class LuaRedisLib {
public static stringFrom(element: any[]): string {
let elementValue: string = "";
Eif (element) {
element.forEach((c) => {
elementValue += String.fromCharCode(c);
});
}
return elementValue;
}
public static LoadLibrary(L: any, request: IRequest): void {
this.logger.debug("Assembling lua redis library");
const argv: string[] = [],
keycount: string = request.getParam(1),
keys: string[] = [];
for (let index = 2; index < request.getParams().length; index++) {
if (index > Number(keycount) + 1) {
argv.push(request.getParam(index));
} else {
keys.push(request.getParam(index));
}
}
this.createLuaTable(
L,
"ARGV",
argv
);
this.createLuaTable(
L,
"KEYS",
keys
);
const redis: any = {
"call": () => {
const n = lua.lua_gettop(L);
const args : string[] = new Array(n - 1);
let cmd: any = null;
this.logger.debug(`CALL pushing ${n} args`);
let returned: any = null;
for (let i = 0; i < n; i++) {
let value: any = null;
switch (lua.lua_type(
L,
i + 1
)) {
case lua.LUA_TNIL:
this.logger.debug("RCALL: LUA_TNIL");
value = null;
break;
case lua.LUA_TNUMBER:
value = lua.lua_tonumber(
L,
i + 1
);
value = String(Number(parseInt(
value,
10
)));
this.logger.debug(`RCALL: LUA_TNUMBER: ${value}`);
break;
case lua.LUA_TBOOLEAN:
value = lua.lua_toboolean(
L,
i + 1
);
this.logger.debug(`RCALL: LUA_TBOOLEAN: ${value}`);
break;
case lua.LUA_TSTRING:
value = lua.lua_tojsstring(
L,
i + 1
);
this.logger.debug(`RCALL: LUA_TSTRING: ${value}`);
break;
case lua.LUA_TTABLE:
default:
this.logger.warn("Not prepared to readtable");
// Value = this.flua_readtable(L, i + 1);
break;
}
if (i === 0) {
cmd = value;
this.logger.debug(`pushjs setting cmd to ${cmd}`);
} else {
args[i - 1] = value;
this.logger.debug(
`pushjs setting arg[${i - 1}] to "%s"`,
value
);
}
}
this.logger.debug(`LUA starting call to ${cmd} (${args})`);
this.logger.debug(
`RCALL redis with ${cmd} and %s`,
...args
);
const execcommand: IRespCommand = request.getServerContext().getCommand(cmd),
rqst: IRequest = new DefaultRequest(
request.getServerContext(),
request.getSession(),
cmd,
args
);
const response: any = execcommand.execSync(rqst);
this.logger.debug(`Type of response is ${response.constructor.name}`);
const parser: Parser = new Parser({
"returnBuffers": false,
"returnError": (err: any) => {
this.logger.warn(
"returnError: \"%j\"",
err
);
return err;
},
"returnReply": (result: any) => {
this.logger.debug(`Replying with: ${result}`);
returned = result;
},
// Force numbers from double precision to integer
"stringNumbers": true
}),
serializedResponse: string = new RespSerialize(response).serialize();
parser.execute(Buffer.from(serializedResponse));
this.logger.debug(
"parsedReply is %s",
returned
);
this.logger.debug(
`LUA call returned ${returned}: %j`,
returned
);
Eif (returned) {
this.logger.debug(`return value is ${returned.constructor.name}`);
Iif (returned.constructor.name === "Number") {
this.logger.debug(`Adjusting Number (${returned}) to Integer`);
returned = String(parseInt(
String(returned),
10
));
}
} else {
this.logger.debug("return value is null or undefined");
}
Iif (Array.isArray(returned) && returned.length === 0) {
this.logger.debug("Pushing NIL into empty returned array");
returned.push(null);
}
/*
* If (Array.isArray(returned)) {
* This.logger.debug(`Preserving returned value(s) %j`, returned);
* Request.getResponses().push(returned);
* }
*/
this.pushany(
L,
returned
);
this.logger.debug(`returned.length is ${Array.isArray(returned)
? returned.length
: 1}`);
this.logger.debug(`Returning ${Array.isArray(returned)
? returned.length
: 1}`);
return String(Array.isArray(returned)
? returned.length
: 1);
}
};
lua.lua_createtable(
L,
0,
Object.keys(redis).length
);
// For (const key of Object.keys(redis)) {
this.logger.debug("Registering redis lib function \"call\"");
lua.lua_pushstring(
L,
"call"
);
lua.lua_pushjsfunction(
L,
(LIB: any) => {
/*
* This is the entry point for redis.call()
* Which we call below with redis['call'].call(null, ...args);
*/
const n = lua.lua_gettop(LIB);
const args = new Array(n),
stringArgs = new Array(n - 1);
let cmd: string = "";
for (let i = 0; i < n; i++) {
const value: any = lua.lua_tonumber(
LIB,
i + 1
);
args[i] = value;
if (i === 0) {
cmd = LuaRedisLib.stringFrom(lua.lua_tostring(
LIB,
i + 1
));
} else {
stringArgs[i - 1] = LuaRedisLib.stringFrom(lua.lua_tostring(
LIB,
i + 1
));
}
}
this.logger.debug(
`lua_pushjsfunction: REDIS calling '${cmd}' with %j`,
...stringArgs
);
const callReturn: any = redis.call.call(
null,
...args
);
// CallReturn is the number of arguments that were pushed to the stack by lua
this.logger.debug(
`lua_pushjsfunction: REDIS "call" returned ${callReturn}: %j`,
callReturn
);
this.logger.debug(`lua_pushjsfunction: return value is ${callReturn
? callReturn.constructor.name
: "not defined"}`);
switch (true) {
case callReturn && callReturn.constructor.name === "Number":
// CallReturn is the number of arguments that were pushed to the stack by lua
this.logger.debug(`lua_pushjsfunction: Pushing returned argument count ${callReturn} as number`);
lua.lua_pushnumber(
LIB,
callReturn
);
break;
default:
this.logger.warn(
`Ignore: Not pushing type "${callReturn
? callReturn.constructor.name
: "null or undefined"} %j`,
callReturn
);
}
this.logger.debug(`lua_pushjsfunction: callReturn.length is ${Array.isArray(callReturn)
? callReturn.length
: 1}`);
return Array.isArray(callReturn)
? callReturn.length
: 1;
}
);
lua.lua_rawset(
L,
-3
);
// }
this.logger.debug("Setting \"redis\" global");
lua.lua_setglobal(
L,
"redis"
);
}
private static logger: Logger = new Logger(module.id);
private static createLuaTable(L: any, tableName: string, tableArray: string[]) {
this.logger.debug(`Creating ${tableName} table`);
lua.lua_createtable(
L,
tableArray.length,
0
);
// Reverse the value array
for (let index = tableArray.length - 1; index > -1; index--) {
lua.lua_pushstring(
L,
tableArray[index]
);
lua.lua_seti(
L,
-2,
index + 1
);
}
lua.lua_setglobal(
L,
fengari.to_luastring(tableName)
);
}
private static pushany(L: any, element: any) {
switch (true) {
case !element || element === null:
this.logger.debug("Push nil");
lua.lua_pushnil(L);
break;
case element.constructor.name === "String":
this.logger.debug(`Push string ${element}`);
if (!isNaN(Number(element))) {
this.logger.debug(`Converting ${element} to integer`);
// eslint-disable-next-line no-param-reassign
element = String(parseInt(
element,
10
));
}
lua.lua_pushstring(
L,
element
);
break;
case element.constructor.name === "Number":
// eslint-disable-next-line no-param-reassign
element = String(parseInt(
String(element),
10
));
this.logger.debug(`Push number: ${element} as string`);
lua.lua_pushstring(
L,
element
);
break;
case element.constructor.name === "Boolean":
this.logger.debug(`Push boolean: ${element}`);
lua.lua_pushboolean(
L,
element
);
break;
case element.constructor.name === "Array":
this.pushtable(
L,
element
);
break;
default:
this.logger.warn(
`Not prepared to push type "${element.constructor.name}": %j`,
element
);
throw new Error(`Not prepared to push type "${element.constructor.name}": ${element}`);
}
}
private static pushtable(L: any, table: any[]) {
this.logger.debug(
"pushtable(L, %j)",
...table
);
this.logger.debug(`Table length is ${table.length}`);
lua.lua_createtable(
L,
0,
table.length
);
for (let counter = 0; counter < table.length; counter++) {
this.pushany(
L,
table[counter]
);
lua.lua_rawseti(
L,
-2,
counter + 1
);
}
}
}
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