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Copy pathmodule.cpp
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426 lines (363 loc) · 12.9 KB
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#include "js.h"
#include "redismodule.h"
#include <limits.h>
#include <vector>
#include <v8.h>
#include <math.h>
#include <fstream>
#include <streambuf>
#include <dlfcn.h>
#include <experimental/filesystem>
RedisModuleCtx *g_ctx = nullptr;
JSContext *g_jscontext = nullptr;
bool g_fInStartup = true;
class KeyDBContext
{
RedisModuleCtx *m_ctxSave;
public:
KeyDBContext(RedisModuleCtx *ctxSet)
{
m_ctxSave = g_ctx;
g_ctx = ctxSet;
}
~KeyDBContext()
{
g_ctx = m_ctxSave;
}
};
static void processResult(RedisModuleCtx *ctx, v8::Isolate *isolate, v8::Local<v8::Context> &v8ctx, v8::Local<v8::Value> &result)
{
if (result->IsArray())
{
v8::Local<v8::Array> array = v8::Local<v8::Array>::Cast(result);
RedisModule_ReplyWithArray(g_ctx, array->Length());
for (size_t ielem = 0; ielem < array->Length(); ++ielem)
{
auto maybe = array->Get(v8ctx, ielem);
v8::Local<v8::Value> val;
if (maybe.ToLocal(&val))
processResult(ctx, isolate, v8ctx, val);
else
RedisModule_ReplyWithNull(ctx);
}
}
else if (result->IsInt32())
{
v8::Local<v8::Int32> num = v8::Local<v8::Int32>::Cast(result);
int32_t val = num->Value();
RedisModule_ReplyWithLongLong(ctx, val);
}
else if (result->IsNumber())
{
v8::Local<v8::Number> num = v8::Local<v8::Number>::Cast(result);
double dv = num->Value();
RedisModule_ReplyWithDouble(ctx, dv);
}
else if (result->IsString())
{
v8::String::Utf8Value utf8(isolate, result);
RedisModule_ReplyWithCString(ctx, *utf8);
}
else
{
RedisModule_ReplyWithNull(ctx);
}
}
static void ProcessCallReply(v8::Local<v8::Value> &dst, v8::Isolate* isolate, RedisModuleCallReply *reply)
{
const char *rgchReply;
size_t cchReply;
switch (RedisModule_CallReplyType(reply))
{
case REDISMODULE_REPLY_STRING:
rgchReply = RedisModule_CallReplyStringPtr(reply, &cchReply);
dst = v8::String::NewFromUtf8(isolate, rgchReply, v8::NewStringType::kNormal, cchReply).ToLocalChecked();
break;
case REDISMODULE_REPLY_INTEGER:
{
long long val = RedisModule_CallReplyInteger(reply);
dst = v8::Number::New(isolate, (double)val);
break;
}
case REDISMODULE_REPLY_ARRAY:
{
size_t celem = RedisModule_CallReplyLength(reply);
auto array = v8::Array::New(isolate, celem);
for (size_t ielem = 0; ielem < celem; ++ielem)
{
RedisModuleCallReply *replyArray = RedisModule_CallReplyArrayElement(reply, ielem);
v8::Local<v8::Value> val;
ProcessCallReply(val, isolate, replyArray);
v8::Maybe<bool> result = array->Set(isolate->GetCurrentContext(), ielem, val);
bool fResult;
if (!result.To(&fResult) || !fResult)
{
RedisModule_Log(g_ctx, "warning", "Failed to process array result");
}
}
dst = array;
break;
}
default:
rgchReply = RedisModule_CallReplyProto(reply, &cchReply);
dst = v8::String::NewFromUtf8(isolate, rgchReply, v8::NewStringType::kNormal, cchReply).ToLocalChecked();
}
}
void KeyDBExecuteCallback(const v8::FunctionCallbackInfo<v8::Value>& args)
{
if (args.Length() < 1) return;
v8::Isolate* isolate = args.GetIsolate();
v8::HandleScope scope(isolate);
v8::Local<v8::Value> vfnName = args[0];
v8::String::Utf8Value fnName(isolate, vfnName);
std::vector<RedisModuleString*> vecstrs;
for (int iarg = 1; iarg < args.Length(); ++iarg)
{
v8::String::Utf8Value argument(isolate, args[iarg]);
vecstrs.push_back(RedisModule_CreateString(g_ctx, *argument, argument.length()));
}
RedisModuleCallReply *reply = RedisModule_Call(g_ctx, *fnName, "v", vecstrs.data(), vecstrs.size());
if (reply != nullptr)
{
v8::Local<v8::Value> result;
ProcessCallReply(result, isolate, reply);
args.GetReturnValue().Set(result);
RedisModule_FreeCallReply(reply);
}
else
{
isolate->ThrowException(v8::String::NewFromUtf8(isolate, "Invalid Command").ToLocalChecked());
}
for (auto str : vecstrs)
RedisModule_FreeString(g_ctx, str);
}
void LogCallback(const v8::FunctionCallbackInfo<v8::Value>& args)
{
v8::Isolate* isolate = args.GetIsolate();
v8::HandleScope scope(isolate);
if (args.Length() != 2)
{
isolate->ThrowException(v8::String::NewFromUtf8(isolate, "Log expects two parameters").ToLocalChecked());
return;
}
v8::String::Utf8Value level(isolate, args[0]);
v8::String::Utf8Value message(isolate, args[1]);
RedisModule_Log(g_ctx, *level, "%s", *message);
}
int js_command(RedisModuleCtx *ctx, RedisModuleString **argv, int argc)
{
KeyDBContext ctxsav(ctx);
v8::Locker locker(g_jscontext->getIsolate());
v8::HandleScope scope(g_jscontext->getIsolate());
if (argc < 1)
return REDISMODULE_ERR;
v8::Local<v8::Context> context = g_jscontext->getCurrentContext();
v8::Context::Scope context_scope(context);
try
{
size_t cchName;
const char *rgchName = RedisModule_StringPtrLen(argv[0], &cchName);
v8::Handle<v8::Object> global = context->Global();
v8::Isolate *isolate = g_jscontext->getIsolate();
auto strFn = v8::String::NewFromUtf8(isolate, rgchName, v8::NewStringType::kNormal, cchName).ToLocalChecked();
auto mvfnCall = global->Get(context, v8::Local<v8::Value>::Cast(strFn));
v8::Handle<v8::Value> vfnCall;
if (!mvfnCall.ToLocal(&vfnCall))
return REDISMODULE_ERR;
if (!vfnCall->IsFunction())
return REDISMODULE_ERR;
v8::Handle<v8::Function> fnCall = v8::Handle<v8::Function>::Cast(vfnCall);
std::vector<v8::Local<v8::Value>> vecargs;
vecargs.reserve(argc);
for (int iarg = 1; iarg < argc; ++iarg)
{
size_t cch;
const char *rgch = RedisModule_StringPtrLen(argv[iarg], &cch);
auto str = v8::String::NewFromUtf8(isolate, rgch, v8::NewStringType::kNormal, cch).ToLocalChecked();
vecargs.push_back(str);
}
auto maybeResult = fnCall->Call(context, global, (int)vecargs.size(), vecargs.data());
v8::Local<v8::Value> result;
if (!maybeResult.ToLocal(&result))
{
RedisModule_ReplyWithNull(ctx);
return REDISMODULE_OK;
}
processResult(ctx, g_jscontext->getIsolate(), context, result);
}
catch (std::string strerr)
{
RedisModule_ReplyWithError(ctx, strerr.c_str());
return REDISMODULE_ERR;
}
catch (std::nullptr_t)
{
RedisModule_ReplyWithError(ctx, "Unknown Error");
return REDISMODULE_ERR;
}
return REDISMODULE_OK;
}
void RegisterCommandCallback(const v8::FunctionCallbackInfo<v8::Value>& args)
{
if (args.Length() < 1) return;
v8::Isolate* isolate = args.GetIsolate();
v8::HandleScope scope(isolate);
if (!g_fInStartup)
{
isolate->ThrowException(v8::String::NewFromUtf8(isolate, "New commands may only be registered during startup").ToLocalChecked());
return;
}
v8::Local<v8::Value> vfn = args[0];
if (!vfn->IsFunction())
return;
v8::Local<v8::Function> fn = v8::Local<v8::Function>::Cast(vfn);
v8::Local<v8::Value> vfnName = fn->GetName();
v8::String::Utf8Value fnName(isolate, vfnName);
std::string flags = "write deny-oom random";
if (args.Length() >= 2)
{
// They passed in their own flags
v8::Local<v8::Value> vFlags = args[1];
if (vFlags->IsString())
{
auto utfFlags = v8::String::Utf8Value(isolate, vFlags);
flags = *utfFlags;
}
}
int keyFirst = 0;
int keyLast = 0;
int keyStep = 0;
if (args.Length() > 2)
{
if (args.Length() != 5)
{
isolate->ThrowException(v8::String::NewFromUtf8(isolate, "incorrect number of arguments to register()").ToLocalChecked());
return;
}
if (!args[2]->IsInt32() || !args[3]->IsInt32() || !args[4]->IsInt32())
{
isolate->ThrowException(v8::String::NewFromUtf8(isolate, "expected integer argument").ToLocalChecked());
return;
}
keyFirst = v8::Local<v8::Int32>::Cast(args[2])->Value();
keyLast = v8::Local<v8::Int32>::Cast(args[3])->Value();
keyStep = v8::Local<v8::Int32>::Cast(args[4])->Value();
}
if (RedisModule_CreateCommand(g_ctx, *fnName, js_command, flags.c_str(), keyFirst, keyLast, keyStep) == REDISMODULE_ERR) {
isolate->ThrowException(v8::String::NewFromUtf8(isolate, "failed to register command").ToLocalChecked());
}
RedisModule_Log(g_ctx, "verbose", "Function %s registered", *fnName);
}
int evaljs_command(RedisModuleCtx *ctx, RedisModuleString **argv, int argc)
{
KeyDBContext ctxsav(ctx);
if (argc != 2)
{
RedisModule_WrongArity(ctx);
return REDISMODULE_ERR;
}
if (g_jscontext == nullptr)
{
g_jscontext = new JSContext();
g_jscontext->initialize();
}
v8::Locker locker(g_jscontext->getIsolate());
size_t cch = 0;
const char *rgch = RedisModule_StringPtrLen(argv[1], &cch);
try
{
v8::HandleScope scope(g_jscontext->getIsolate());
v8::Local<v8::Value> result = g_jscontext->run(rgch, cch);
auto context = g_jscontext->getCurrentContext();
processResult(ctx, g_jscontext->getIsolate(), context, result);
}
catch (std::string strerr)
{
RedisModule_ReplyWithError(ctx, strerr.c_str());
return REDISMODULE_ERR;
}
catch (std::nullptr_t)
{
RedisModule_ReplyWithError(ctx, "Unknown Error");
return REDISMODULE_ERR;
}
return REDISMODULE_OK;
}
int run_startup_script(RedisModuleCtx *ctx, const char *szPath)
{
KeyDBContext ctxsav(ctx);
std::ifstream file(szPath, std::ios::binary | std::ios::ate);
std::streamsize size = file.tellg();
if (size == -1)
{
RedisModule_Log(ctx, "warning", "startup script does not exist");
return REDISMODULE_ERR; // Failed to read file
}
file.seekg(0, std::ios::beg);
std::vector<char> buffer(size);
if (!file.read(buffer.data(), size))
{
RedisModule_Log(ctx, "warning", "failed to read startup script");
return REDISMODULE_ERR; // Failed to read file
}
v8::HandleScope scope(g_jscontext->getIsolate());
try
{
g_jscontext->run(buffer.data(), buffer.size(), true /* don't cache */);
}
catch (std::string str)
{
RedisModule_Log(ctx, "warning", "%s", str.c_str());
return REDISMODULE_ERR;
}
return REDISMODULE_OK;
}
int ReplyWithCString(RedisModuleCtx *ctx, const char *sz)
{
return RedisModule_ReplyWithStringBuffer(ctx, sz, strlen(sz));
}
extern "C" int __attribute__((visibility("default"))) RedisModule_OnLoad(RedisModuleCtx *ctx, RedisModuleString **argv, int argc)
{
if (RedisModule_Init(ctx,"modjs",1,REDISMODULE_APIVER_1) == REDISMODULE_ERR)
return REDISMODULE_ERR;
if (RedisModule_ReplyWithCString == nullptr)
RedisModule_ReplyWithCString = ReplyWithCString;
if (RedisModule_CreateCommand(ctx,"evaljs", evaljs_command,"write deny-oom random",0,0,0) == REDISMODULE_ERR)
return REDISMODULE_ERR;
javascript_initialize();
g_jscontext = new JSContext();
g_jscontext->initialize();
RedisModule_Log(g_ctx, "warning", "Initialized ModJS v0.1.0");
// Run our bootstrap.js code
{
Dl_info dlInfo;
dladdr((const void*)RedisModule_OnLoad, &dlInfo);
if (dlInfo.dli_sname != NULL && dlInfo.dli_saddr != NULL)
{
std::experimental::filesystem::path path(dlInfo.dli_fname);
path.remove_filename();
path /= "bootstrap.js";
std::string strPath = path.string();
if (run_startup_script(ctx, strPath.c_str()) == REDISMODULE_ERR)
{
RedisModule_Log(ctx, "warning", "failed to run bootstrap.js, ensure this is located in the same location as the .so");
return REDISMODULE_ERR;
}
}
else
{
RedisModule_Log(ctx, "warning", "failed to locate bootstrap script");
return REDISMODULE_ERR;
}
}
for (int iarg = 0; iarg < argc; ++iarg)
{
// Process the startup script
size_t cchPath;
const char *rgchPath = RedisModule_StringPtrLen(argv[iarg], &cchPath);
if (run_startup_script(ctx, rgchPath) == REDISMODULE_ERR)
return REDISMODULE_ERR;
}
g_fInStartup = false;
return REDISMODULE_OK;
}