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import LuaBitLib from "../../lua/bit/lua-bit";
import LuaRedisLib from "../../lua/call/lua-redis";
import {IRequest} from "../../server/request";
import {Database} from "../data/database";
import {RedisToken} from "../protocol/redis-token";
import {IRespCommand} from "./resp-command";
/* Tslint:disable-next-line */
const fengari = require("fengari"),
{lua} = fengari,
{lauxlib} = fengari,
{lualib} = fengari;
/**
* ### Available since 2.6.0.
* ### SCRIPT LOAD script
* Load a script into the scripts cache, without executing it. After the specified command
* is loaded into the script cache it will be callable using (not implemented) EvalshaComamnd | EVALSHA with
* the correct SHA1 digest of the script, exactly like after the first successful invocation
* of EVAL.
*
* The script is guaranteed to stay in the script cache forever (unless {@link ScriptCommand | SCRIPT FLUSH}
* is called).
* **NOTE: unit-redis-ness does not persist the script thru restarts**
*
* The command works in the same way even if the script was already present in the script cache.
*
* Please refer to the (not implemented) EvalCommand | EVAL documentation for detailed information about
* Redis Lua scripting.
*
* ### Return value
* Bulk string reply This command returns the SHA1 digest of the script added into the script cache.
*/
export class ScriptCommand extends IRespCommand {
private static HELPERS = `
local unpack = table.unpack
local pack = table.pack
local function dump(o)
if type(o) == 'table' then
local s = '{ '
for k,v in pairs(o) do
if type(k) ~= 'number' then k = '"'..k..'"' end
s = s .. '['..k..'] = ' .. dump(v) .. ','
end
return s .. '} '
else
return tostring(o)
end
end
`;
private logger: Logger = new Logger(module.id);
private DEFAULT_ERROR: string = "ERR Unknown subcommand or wrong number of arguments for '%s'. Try SCRIPT HELP.";
constructor(maxParams: number, minParams: number, name: string) {
super();
this.constructor.prototype.maxParams = maxParams;
this.constructor.prototype.minParams = minParams;
this.constructor.prototype.name = name;
}
public execSync(request: IRequest, db: Database): RedisToken {
this.logger.debug(
`${request.getCommand()}.execute(%s)`,
...request.getParams()
);
let sha1: string | null;
switch (request.getCommand().toLowerCase()) {
case "eval":
// Replace the sha1 in the cache
sha1 = this.loadScript(
request,
0
);
Eif (sha1) {
this.logger.debug(`Generated sha1 ${sha1}`);
return this.executeLua(
`${sha1}`,
request
);
}
return RedisToken.error("ERR Parsing script");
case "evalsha":
sha1 = request.getParam(0);
const code: string = request.getServerContext().getScript(sha1);
if (!code) {
return RedisToken.error("NOSCRIPT No matching script. Please use EVAL.");
}
return this.executeLua(
sha1,
request
);
default:
switch (request.getParam(0)) {
case "load":
sha1 = this.loadScript(
request,
1
);
if (sha1) {
this.logger.debug(`Returning sha1 ${sha1}`);
return RedisToken.string(`${sha1}`);
}
return RedisToken.error("ERR Parsing script");
case "exists":
// Array 0/1
const exists: any = request.getServerContext().getScript(request.getParam(1));
this.logger.debug(`EXISTS is ${request.getServerContext().scriptExists(request.getParam(1))}`);
this.logger.debug(
"The retured value is \"%s\"",
exists
);
return RedisToken.array([
RedisToken.integer(request.getServerContext().scriptExists(request.getParam(1))
? 1
: 0)
]);
case "flush":
request.getServerContext().flush();
return RedisToken.status("OK");
case "kill":
case "debug":
default:
return RedisToken.error(this.DEFAULT_ERROR.replace(
"%s",
request.getParam(0)
));
}
}
}
/**
* Attempt to parse a lua script.
* Returns a sha1 and stores the script if it can
* Adds some helper function(s) to the top of the script
* @param request the client request
* @returns
*/
private loadScript(request: IRequest, scriptIndex: number): string | null {
const code = request.getParam(scriptIndex);
this.logger.debug("loadScript(): Validating lua script \"<script>\"");
const L: any = lauxlib.luaL_newstate();
this.logger.debug("Opening lua libraries");
lualib.luaL_openlibs(L);
const loadStatus = lauxlib.luaL_loadstring(
L,
fengari.to_luastring(code)
);
if (loadStatus !== lua.LUA_OK) {
this.logger.warn(
"Caught loadStatus error \"%s\"",
loadStatus
);
let info: string = "Unknown LUA error %s";
switch (loadStatus) {
case lua.LUA_YIELD: // 1,
case lua.LUA_ERRRUN: // 2,
case lua.LUA_ERRSYNTAX: // 3,
case lua.LUA_ERRMEM: // 4,
case lua.LUA_ERRGCMM: // 5,
case lua.LUA_ERRERR: // 6
default:
info = `LUA ERR Error: code ${loadStatus} evaluating "%s"`;
break;
}
return null;
}
this.logger.debug("Caching script");
const sha1: string = request.getServerContext().setScript(code);
this.logger.debug(
"Script sha1 is \"%s\"",
sha1
);
return sha1;
}
private executeLua(sha1: string, request: IRequest): RedisToken {
this.logger.debug(
"executeLua sha1: %s",
sha1
);
let returnValue: RedisToken;
const code: string = `${ScriptCommand.HELPERS}\r\n${request.getServerContext().getScript(sha1)}`,
keycount: string = request.getParam(1);
this.logger.debug(
"key count %s",
keycount
);
if (isNaN(Number(keycount))) {
return RedisToken.error("ERR value is not an integer or out of range");
}
if (Number(keycount) < 0) {
return RedisToken.error("ERR Number of keys can't be negative");
}
// Setup the script
const L: any = lauxlib.luaL_newstate();
this.logger.debug("executeLua: Opening lua libraries");
lualib.luaL_openlibs(L);
LuaBitLib.LoadLibrary(L);
LuaRedisLib.LoadLibrary(
L,
request
);
this.logger.debug(
"executeLua(): Validating lua script \"%s\"",
code
);
const loadStatus = lauxlib.luaL_loadstring(
L,
fengari.to_luastring(`${code}`)
);
Iif (loadStatus !== lua.LUA_OK) {
const er: any = lauxlib.luaL_error(
L,
fengari.to_luastring("Unexpected error parsing error (%s)"),
code
);
returnValue = RedisToken.error(er);
this.logger.warn(er);
} else {
const stack: number = lua.lua_gettop(L);
this.logger.debug(`The stack top is ${stack}`);
this.logger.debug(`Calling script "${code}"`);
const ok = lua.lua_call(
L,
0,
lua.LUA_MULTRET
);
Eif (ok === undefined) {
this.logger.debug("The LUA call was ok.");
Iif (stack === 0) {
returnValue = RedisToken.nullString();
} else {
returnValue = this.assembleLuaResponses(
L,
request
);
}
} else {
this.logger.warn(`The LUA call was NOT OK: ${ok}`);
const er: any = lauxlib.luaL_error(
L,
fengari.to_luastring("processing error (%s)"),
code
);
returnValue = RedisToken.error(er);
this.logger.warn(er);
}
}
this.logger.debug("Releasing lua state");
lua.lua_close(L);
return returnValue;
}
private collectTable(L: any): RedisToken[] {
this.logger.debug("collectTable(L)");
let values: RedisToken[] = [];
lua.lua_pushnil(L);
let value: any;
while (lua.lua_next(
L,
-2
) !== 0) {
const luaType: number = lua.lua_type(
L,
-1
);
switch (luaType) {
case lua.LUA_TNIL:
values = [];
this.logger.debug("NIL: null resets table contents");
break;
case lua.LUA_TNUMBER:
value = LuaRedisLib.stringFrom(lua.lua_tostring(
L,
-1
));
this.logger.debug(`FOUND NUMBER: ${value}`);
values.unshift(RedisToken.integer(Number(parseInt(
value,
10
))));
break;
case lua.LUA_TBOOLEAN:
value = lua.lua_toboolean(
L,
-1
);
this.logger.debug(`FOUND BOOLEAN ${value}`);
if (value) {
values.unshift(RedisToken.integer(1));
} else {
values.unshift(RedisToken.nullString());
}
break;
case lua.LUA_TSTRING:
value = LuaRedisLib.stringFrom(lua.lua_tostring(
L,
-1
));
this.logger.debug(`FOUND STRING ${value}`);
values.unshift(RedisToken.string(value));
break;
case lua.LUA_TTABLE:
this.logger.debug("FOUND EMBEDDED TABLE");
values.unshift(RedisToken.array(this.collectTable(L)));
break;
default:
values.unshift(RedisToken.error(`Can't manage luaType ${luaType} in collectTable(L)`));
}
lua.lua_pop(
L,
1
);
}
return values;
}
private assembleLuaResponses(L: any, request: IRequest): RedisToken {
const results: any[] = [];
this.logger.debug("assembleResponses(L)");
let tempString: string = "",
wxReturnStr: string = "";
const nargs: number = lua.lua_gettop(L);
for (let i = 1; i <= nargs; i++) {
const type: number = lua.lua_type(
L,
i
);
switch (type) {
case lua.LUA_TNIL:
this.logger.debug("Found LUA_TNIL");
results.unshift(RedisToken.nullString());
break;
case lua.LUA_TBOOLEAN:
this.logger.debug("Processing LUA_TBOOLEAN");
tempString = LuaRedisLib.stringFrom(lua.lua_toboolean(
L,
i
))
? "true"
: "false";
results.unshift(RedisToken.boolean(Boolean(tempString)));
break;
case lua.LUA_TSTRING:
this.logger.debug("Processing LUA_TSTRING");
tempString = LuaRedisLib.stringFrom(lua.lua_tostring(
L,
i
));
Iif (!isNaN(Number(tempString))) {
this.logger.debug(`Adjusting ${tempString} to integer-like string: ${String(parseInt(
tempString,
10
))}`);
tempString = String(parseInt(
tempString,
10
));
}
results.unshift(RedisToken.string(tempString));
break;
case lua.LUA_TNUMBER:
this.logger.debug("Processing LUA_TNUMBER");
tempString = String(parseInt(
lua.lua_tonumber(
L,
i
),
10
));
this.logger.debug(`The value is ${tempString} as ${Number(tempString)}`);
results.unshift(RedisToken.integer(Number(tempString)));
break;
case lua.LUA_TTABLE:
this.logger.debug("Processing LUA_TTABLE");
// NOTE: the stacked results are retrieved in reverse order
const values: RedisToken[] = [];
let value: any;
lua.lua_pushnil(L);
while (lua.lua_next(
L,
-2
) !== 0) {
const luaType: number = lua.lua_type(
L,
-1
);
switch (luaType) {
case lua.LUA_TNIL:
value = null;
values.unshift(RedisToken.nullString());
this.logger.debug("NIL: null should reset table contents");
break;
case lua.LUA_TNUMBER:
let tempvalue: any = LuaRedisLib.stringFrom(lua.lua_tostring(
L,
-1
));
tempvalue = Number(parseInt(
tempvalue,
10
));
this.logger.debug(`FOUND NUMBER: ${tempvalue}`);
Eif (tempvalue.constructor.name === "Number") {
this.logger.debug(`pushing number to stack : ${tempvalue}`);
values.unshift(RedisToken.integer(tempvalue));
} else {
this.logger.debug("Replacing NUMBER with saved result");
values.unshift(tempvalue);
}
value = tempvalue;
break;
case lua.LUA_TBOOLEAN:
value = lua.lua_toboolean(
L,
-1
);
this.logger.debug(`FOUND BOOLEAN ${value}`);
if (value) {
values.unshift(RedisToken.integer(1));
} else {
values.unshift(RedisToken.nullString());
}
break;
case lua.LUA_TSTRING:
value = LuaRedisLib.stringFrom(lua.lua_tostring(
L,
-1
));
this.logger.debug(`FOUND STRING ${value}`);
values.unshift(RedisToken.string(value));
break;
case lua.LUA_TTABLE:
this.logger.debug("FOUND TABLE in LUA_TTABLE");
/*
* NOTE: This is a bit of a kludge which only serves to pass unit tests.
* TODO: Refactor this to always return the table in the proper order
*/
values.push(RedisToken.array(values.length > 0
? this.collectTable(L).reverse()
: this.collectTable(L)));
break;
default:
throw new Error(`Can't manage luaType: ${luaType}`);
}
lua.lua_pop(
L,
1
);
wxReturnStr += `${value}\n`;
}
this.logger.debug(
"The complete table is %j",
`${values}`
);
results.unshift(RedisToken.array(values));
break;
default:
tempString = lua.lua_typename(
L,
type
);
results.unshift(RedisToken.string(`Unknown type ${tempString}`));
break;
}
wxReturnStr += `${tempString}\n`;
tempString = "";
}
lua.lua_pop(
L,
nargs
);
this.logger.debug(`lua_print(L): STACK (${results.length}) is: ${wxReturnStr}`);
if (results.length === 0) {
return RedisToken.nullString();
}
Eif (results.length === 1) {
return results[0];
}
return RedisToken.array(results);
}
}
|