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#ifndef SRC_STREAM_BASE_H_
#define SRC_STREAM_BASE_H_
#include "env.h"
#include "async-wrap.h"
#include "req-wrap.h"
#include "req-wrap-inl.h"
#include "node.h"
#include "v8.h"
namespace node {
// Forward declarations
class StreamBase;
template <class Req>
class StreamReq {
public:
typedef void (*DoneCb)(Req* req, int status);
explicit StreamReq(DoneCb cb) : cb_(cb) {
}
inline void Done(int status) {
cb_(static_cast<Req*>(this), status);
}
private:
DoneCb cb_;
};
class ShutdownWrap : public ReqWrap<uv_shutdown_t>,
public StreamReq<ShutdownWrap> {
public:
ShutdownWrap(Environment* env,
v8::Local<v8::Object> req_wrap_obj,
StreamBase* wrap,
DoneCb cb)
: ReqWrap(env, req_wrap_obj, AsyncWrap::PROVIDER_SHUTDOWNWRAP),
StreamReq<ShutdownWrap>(cb),
wrap_(wrap) {
Wrap(req_wrap_obj, this);
}
static void NewShutdownWrap(const v8::FunctionCallbackInfo<v8::Value>& args) {
CHECK(args.IsConstructCall());
}
inline StreamBase* wrap() const { return wrap_; }
private:
StreamBase* const wrap_;
};
class WriteWrap: public ReqWrap<uv_write_t>,
public StreamReq<WriteWrap> {
public:
WriteWrap(Environment* env,
v8::Local<v8::Object> obj,
StreamBase* wrap,
DoneCb cb)
: ReqWrap(env, obj, AsyncWrap::PROVIDER_WRITEWRAP),
StreamReq<WriteWrap>(cb),
wrap_(wrap) {
Wrap(obj, this);
}
void* operator new(size_t size, char* storage) { return storage; }
// This is just to keep the compiler happy. It should never be called, since
// we don't use exceptions in node.
void operator delete(void* ptr, char* storage) { UNREACHABLE(); }
inline StreamBase* wrap() const {
return wrap_;
}
static void NewWriteWrap(const v8::FunctionCallbackInfo<v8::Value>& args) {
CHECK(args.IsConstructCall());
}
private:
// People should not be using the non-placement new and delete operator on a
// WriteWrap. Ensure this never happens.
void* operator new(size_t size) { UNREACHABLE(); }
void operator delete(void* ptr) { UNREACHABLE(); }
StreamBase* const wrap_;
};
class StreamResource {
public:
typedef void (*AfterWriteCb)(WriteWrap* w, void* ctx);
typedef void (*AllocCb)(size_t size, uv_buf_t* buf, void* ctx);
typedef void (*ReadCb)(ssize_t nread,
const uv_buf_t* buf,
uv_handle_type pending,
void* ctx);
StreamResource() : after_write_cb_(nullptr),
alloc_cb_(nullptr),
read_cb_(nullptr) {
}
virtual ~StreamResource() = default;
virtual int DoShutdown(ShutdownWrap* req_wrap) = 0;
virtual int DoTryWrite(uv_buf_t** bufs, size_t* count) = 0;
virtual int DoWrite(WriteWrap* w,
uv_buf_t* bufs,
size_t count,
uv_stream_t* send_handle) = 0;
virtual const char* Error() const = 0;
virtual void ClearError() = 0;
// Events
inline void OnAfterWrite(WriteWrap* w) {
if (after_write_cb_ != nullptr)
after_write_cb_(w, after_write_ctx_);
}
inline void OnAlloc(size_t size, uv_buf_t* buf) {
if (alloc_cb_ != nullptr)
alloc_cb_(size, buf, alloc_ctx_);
}
inline void OnRead(size_t nread,
const uv_buf_t* buf,
uv_handle_type pending) {
if (read_cb_ != nullptr)
read_cb_(nread, buf, pending, read_ctx_);
}
inline void set_after_write_cb(AfterWriteCb cb, void* ctx) {
after_write_ctx_ = ctx;
after_write_cb_ = cb;
}
inline void set_alloc_cb(AllocCb cb, void* ctx) {
alloc_cb_ = cb;
alloc_ctx_ = ctx;
}
inline void set_read_cb(ReadCb cb, void* ctx) {
read_cb_ = cb;
read_ctx_ = ctx;
}
private:
AfterWriteCb after_write_cb_;
void* after_write_ctx_;
AllocCb alloc_cb_;
void* alloc_ctx_;
ReadCb read_cb_;
void* read_ctx_;
};
class StreamBase : public StreamResource {
public:
template <class Base>
static void AddMethods(Environment* env,
v8::Handle<v8::FunctionTemplate> target);
virtual void* Cast() = 0;
virtual bool IsAlive() const = 0;
virtual bool IsClosing() const = 0;
virtual bool IsIPCPipe() const = 0;
virtual int GetFD() const = 0;
virtual int ReadStart() = 0;
virtual int ReadStop() = 0;
inline void Consume() {
CHECK_EQ(consumed_, false);
consumed_ = true;
}
template <class Outer>
inline Outer* Cast() { return static_cast<Outer*>(Cast()); }
void EmitData(ssize_t nread,
v8::Local<v8::Object> buf,
v8::Local<v8::Object> handle);
protected:
explicit StreamBase(Environment* env) : env_(env), consumed_(false) {
}
virtual ~StreamBase() = default;
virtual AsyncWrap* GetAsyncWrap() = 0;
// Libuv callbacks
static void AfterShutdown(ShutdownWrap* req, int status);
static void AfterWrite(WriteWrap* req, int status);
// JS Methods
int ReadStart(const v8::FunctionCallbackInfo<v8::Value>& args);
int ReadStop(const v8::FunctionCallbackInfo<v8::Value>& args);
int Shutdown(const v8::FunctionCallbackInfo<v8::Value>& args);
int Writev(const v8::FunctionCallbackInfo<v8::Value>& args);
int WriteBuffer(const v8::FunctionCallbackInfo<v8::Value>& args);
template <enum encoding enc>
int WriteString(const v8::FunctionCallbackInfo<v8::Value>& args);
template <class Base>
static void GetFD(v8::Local<v8::String>,
const v8::PropertyCallbackInfo<v8::Value>&);
template <class Base,
int (StreamBase::*Method)( // NOLINT(whitespace/parens)
const v8::FunctionCallbackInfo<v8::Value>& args)>
static void JSMethod(const v8::FunctionCallbackInfo<v8::Value>& args);
private:
Environment* env_;
bool consumed_;
};
} // namespace node
#endif // SRC_STREAM_BASE_H_
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