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#include "stream_base-inl.h"
#include "stream_wrap.h"
#include "node.h"
#include "node_buffer.h"
#include "node_internals.h"
#include "env-inl.h"
#include "js_stream.h"
#include "string_bytes.h"
#include "util-inl.h"
#include "v8.h"
#include <limits.h> // INT_MAX
namespace node {
using v8::Array;
using v8::Boolean;
using v8::Context;
using v8::FunctionCallbackInfo;
using v8::HandleScope;
using v8::Integer;
using v8::Local;
using v8::Number;
using v8::Object;
using v8::String;
using v8::Value;
template int StreamBase::WriteString<ASCII>(
const FunctionCallbackInfo<Value>& args);
template int StreamBase::WriteString<UTF8>(
const FunctionCallbackInfo<Value>& args);
template int StreamBase::WriteString<UCS2>(
const FunctionCallbackInfo<Value>& args);
template int StreamBase::WriteString<LATIN1>(
const FunctionCallbackInfo<Value>& args);
struct Free {
void operator()(char* ptr) const { free(ptr); }
};
int StreamBase::ReadStartJS(const FunctionCallbackInfo<Value>& args) {
return ReadStart();
}
int StreamBase::ReadStopJS(const FunctionCallbackInfo<Value>& args) {
return ReadStop();
}
int StreamBase::Shutdown(const FunctionCallbackInfo<Value>& args) {
CHECK(args[0]->IsObject());
Local<Object> req_wrap_obj = args[0].As<Object>();
return Shutdown(req_wrap_obj);
}
inline void SetWriteResultPropertiesOnWrapObject(
Environment* env,
Local<Object> req_wrap_obj,
const StreamWriteResult& res) {
req_wrap_obj->Set(
env->context(),
env->bytes_string(),
Number::New(env->isolate(), res.bytes)).FromJust();
req_wrap_obj->Set(
env->context(),
env->async(),
Boolean::New(env->isolate(), res.async)).FromJust();
}
int StreamBase::Writev(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
CHECK(args[0]->IsObject());
CHECK(args[1]->IsArray());
Local<Object> req_wrap_obj = args[0].As<Object>();
Local<Array> chunks = args[1].As<Array>();
bool all_buffers = args[2]->IsTrue();
size_t count;
if (all_buffers)
count = chunks->Length();
else
count = chunks->Length() >> 1;
MaybeStackBuffer<uv_buf_t, 16> bufs(count);
size_t storage_size = 0;
size_t offset;
if (!all_buffers) {
// Determine storage size first
for (size_t i = 0; i < count; i++) {
Local<Value> chunk = chunks->Get(i * 2);
if (Buffer::HasInstance(chunk))
continue;
// Buffer chunk, no additional storage required
// String chunk
Local<String> string = chunk->ToString(env->context()).ToLocalChecked();
enum encoding encoding = ParseEncoding(env->isolate(),
chunks->Get(i * 2 + 1));
size_t chunk_size;
if (encoding == UTF8 && string->Length() > 65535)
chunk_size = StringBytes::Size(env->isolate(), string, encoding);
else
chunk_size = StringBytes::StorageSize(env->isolate(), string, encoding);
storage_size += chunk_size;
}
if (storage_size > INT_MAX)
return UV_ENOBUFS;
} else {
for (size_t i = 0; i < count; i++) {
Local<Value> chunk = chunks->Get(i);
bufs[i].base = Buffer::Data(chunk);
bufs[i].len = Buffer::Length(chunk);
}
}
std::unique_ptr<char[], Free> storage;
if (storage_size > 0)
storage = std::unique_ptr<char[], Free>(Malloc(storage_size));
offset = 0;
if (!all_buffers) {
for (size_t i = 0; i < count; i++) {
Local<Value> chunk = chunks->Get(i * 2);
// Write buffer
if (Buffer::HasInstance(chunk)) {
bufs[i].base = Buffer::Data(chunk);
bufs[i].len = Buffer::Length(chunk);
continue;
}
// Write string
CHECK_LE(offset, storage_size);
char* str_storage = storage.get() + offset;
size_t str_size = storage_size - offset;
Local<String> string = chunk->ToString(env->context()).ToLocalChecked();
enum encoding encoding = ParseEncoding(env->isolate(),
chunks->Get(i * 2 + 1));
str_size = StringBytes::Write(env->isolate(),
str_storage,
str_size,
string,
encoding);
bufs[i].base = str_storage;
bufs[i].len = str_size;
offset += str_size;
}
}
StreamWriteResult res = Write(*bufs, count, nullptr, req_wrap_obj);
SetWriteResultPropertiesOnWrapObject(env, req_wrap_obj, res);
if (res.wrap != nullptr && storage) {
res.wrap->SetAllocatedStorage(storage.release(), storage_size);
}
return res.err;
}
int StreamBase::WriteBuffer(const FunctionCallbackInfo<Value>& args) {
CHECK(args[0]->IsObject());
Environment* env = Environment::GetCurrent(args);
if (!args[1]->IsUint8Array()) {
env->ThrowTypeError("Second argument must be a buffer");
return 0;
}
Local<Object> req_wrap_obj = args[0].As<Object>();
uv_buf_t buf;
buf.base = Buffer::Data(args[1]);
buf.len = Buffer::Length(args[1]);
StreamWriteResult res = Write(&buf, 1, nullptr, req_wrap_obj);
if (res.async)
req_wrap_obj->Set(env->context(), env->buffer_string(), args[1]).FromJust();
SetWriteResultPropertiesOnWrapObject(env, req_wrap_obj, res);
return res.err;
}
template <enum encoding enc>
int StreamBase::WriteString(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
CHECK(args[0]->IsObject());
CHECK(args[1]->IsString());
Local<Object> req_wrap_obj = args[0].As<Object>();
Local<String> string = args[1].As<String>();
Local<Object> send_handle_obj;
if (args[2]->IsObject())
send_handle_obj = args[2].As<Object>();
int err;
// Compute the size of the storage that the string will be flattened into.
// For UTF8 strings that are very long, go ahead and take the hit for
// computing their actual size, rather than tripling the storage.
size_t storage_size;
if (enc == UTF8 && string->Length() > 65535)
storage_size = StringBytes::Size(env->isolate(), string, enc);
else
storage_size = StringBytes::StorageSize(env->isolate(), string, enc);
if (storage_size > INT_MAX)
return UV_ENOBUFS;
// Try writing immediately if write size isn't too big
char stack_storage[16384]; // 16kb
size_t data_size;
size_t synchronously_written = 0;
uv_buf_t buf;
bool try_write = storage_size <= sizeof(stack_storage) &&
(!IsIPCPipe() || send_handle_obj.IsEmpty());
if (try_write) {
data_size = StringBytes::Write(env->isolate(),
stack_storage,
storage_size,
string,
enc);
buf = uv_buf_init(stack_storage, data_size);
uv_buf_t* bufs = &buf;
size_t count = 1;
err = DoTryWrite(&bufs, &count);
// Keep track of the bytes written here, because we're taking a shortcut
// by using `DoTryWrite()` directly instead of using the utilities
// provided by `Write()`.
synchronously_written = count == 0 ? data_size : data_size - buf.len;
bytes_written_ += synchronously_written;
// Immediate failure or success
if (err != 0 || count == 0) {
req_wrap_obj->Set(env->context(), env->async(), False(env->isolate()))
.FromJust();
req_wrap_obj->Set(env->context(),
env->bytes_string(),
Integer::NewFromUnsigned(env->isolate(), data_size))
.FromJust();
return err;
}
// Partial write
CHECK_EQ(count, 1);
}
std::unique_ptr<char[], Free> data;
if (try_write) {
// Copy partial data
data = std::unique_ptr<char[], Free>(Malloc(buf.len));
memcpy(data.get(), buf.base, buf.len);
data_size = buf.len;
} else {
// Write it
data = std::unique_ptr<char[], Free>(Malloc(storage_size));
data_size = StringBytes::Write(env->isolate(),
data.get(),
storage_size,
string,
enc);
}
CHECK_LE(data_size, storage_size);
buf = uv_buf_init(data.get(), data_size);
uv_stream_t* send_handle = nullptr;
if (IsIPCPipe() && !send_handle_obj.IsEmpty()) {
// TODO(addaleax): This relies on the fact that HandleWrap comes first
// as a superclass of each individual subclass.
// There are similar assumptions in other places in the code base.
// A better idea would be having all BaseObject's internal pointers
// refer to the BaseObject* itself; this would require refactoring
// throughout the code base but makes Node rely much less on C++ quirks.
HandleWrap* wrap;
ASSIGN_OR_RETURN_UNWRAP(&wrap, send_handle_obj, UV_EINVAL);
send_handle = reinterpret_cast<uv_stream_t*>(wrap->GetHandle());
// Reference LibuvStreamWrap instance to prevent it from being garbage
// collected before `AfterWrite` is called.
req_wrap_obj->Set(env->handle_string(), send_handle_obj);
}
StreamWriteResult res = Write(&buf, 1, send_handle, req_wrap_obj);
res.bytes += synchronously_written;
SetWriteResultPropertiesOnWrapObject(env, req_wrap_obj, res);
if (res.wrap != nullptr) {
res.wrap->SetAllocatedStorage(data.release(), data_size);
}
return res.err;
}
void StreamBase::CallJSOnreadMethod(ssize_t nread, Local<Object> buf) {
Environment* env = env_;
Local<Value> argv[] = {
Integer::New(env->isolate(), nread),
buf
};
if (argv[1].IsEmpty())
argv[1] = Undefined(env->isolate());
AsyncWrap* wrap = GetAsyncWrap();
CHECK_NE(wrap, nullptr);
wrap->MakeCallback(env->onread_string(), arraysize(argv), argv);
}
bool StreamBase::IsIPCPipe() {
return false;
}
int StreamBase::GetFD() {
return -1;
}
Local<Object> StreamBase::GetObject() {
return GetAsyncWrap()->object();
}
int StreamResource::DoTryWrite(uv_buf_t** bufs, size_t* count) {
// No TryWrite by default
return 0;
}
const char* StreamResource::Error() const {
return nullptr;
}
void StreamResource::ClearError() {
// No-op
}
uv_buf_t StreamListener::OnStreamAlloc(size_t suggested_size) {
return uv_buf_init(Malloc(suggested_size), suggested_size);
}
void EmitToJSStreamListener::OnStreamRead(ssize_t nread, const uv_buf_t& buf) {
CHECK_NE(stream_, nullptr);
StreamBase* stream = static_cast<StreamBase*>(stream_);
Environment* env = stream->stream_env();
HandleScope handle_scope(env->isolate());
Context::Scope context_scope(env->context());
if (nread <= 0) {
free(buf.base);
if (nread < 0)
stream->CallJSOnreadMethod(nread, Local<Object>());
return;
}
CHECK_LE(static_cast<size_t>(nread), buf.len);
Local<Object> obj = Buffer::New(env, buf.base, nread).ToLocalChecked();
stream->CallJSOnreadMethod(nread, obj);
}
void ReportWritesToJSStreamListener::OnStreamAfterReqFinished(
StreamReq* req_wrap, int status) {
StreamBase* stream = static_cast<StreamBase*>(stream_);
Environment* env = stream->stream_env();
AsyncWrap* async_wrap = req_wrap->GetAsyncWrap();
HandleScope handle_scope(env->isolate());
Context::Scope context_scope(env->context());
Local<Object> req_wrap_obj = async_wrap->object();
Local<Value> argv[] = {
Integer::New(env->isolate(), status),
stream->GetObject(),
Undefined(env->isolate())
};
const char* msg = stream->Error();
if (msg != nullptr) {
argv[2] = OneByteString(env->isolate(), msg);
stream->ClearError();
}
if (req_wrap_obj->Has(env->context(), env->oncomplete_string()).FromJust())
async_wrap->MakeCallback(env->oncomplete_string(), arraysize(argv), argv);
}
void ReportWritesToJSStreamListener::OnStreamAfterWrite(
WriteWrap* req_wrap, int status) {
OnStreamAfterReqFinished(req_wrap, status);
}
void ReportWritesToJSStreamListener::OnStreamAfterShutdown(
ShutdownWrap* req_wrap, int status) {
OnStreamAfterReqFinished(req_wrap, status);
}
} // namespace node
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