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#
include
"
js_stream.h
"
#
include
"
async_wrap.h
"
#
include
"
env-inl.h
"
#
include
"
node_errors.h
"
#
include
"
stream_base-inl.h
"
#
include
"
util-inl.h
"
#
include
"
v8.h
"
namespace
node
{
using
errors::TryCatchScope;
using
v8::Array;
using
v8::Context;
using
v8::FunctionCallbackInfo;
using
v8::FunctionTemplate;
using
v8::HandleScope;
using
v8::Int32;
using
v8::Isolate;
using
v8::Local;
using
v8::Object;
using
v8::Value;
JSStream::JSStream
(Environment* env, Local<Object> obj)
: AsyncWrap(env, obj, AsyncWrap::
PROVIDER_JSSTREAM
),
StreamBase
(env) {
MakeWeak
();
StreamBase::AttachToObject
(obj);
}
AsyncWrap*
JSStream::GetAsyncWrap
() {
return
static_cast
<AsyncWrap*>(
this
);
}
bool
JSStream::IsAlive
() {
return
true
;
}
bool
JSStream::IsClosing
() {
HandleScope
scope
(
env
()->
isolate
());
Context::Scope
context_scope
(
env
()->
context
());
TryCatchScope
try_catch
(
env
());
Local<Value> value;
if
(!
MakeCallback
(
env
()->
isclosing_string
(),
0
,
nullptr
).
ToLocal
(&value)) {
if
(try_catch.
HasCaught
() && !try_catch.
HasTerminated
())
errors::TriggerUncaughtException
(
env
()->
isolate
(), try_catch);
return
true
;
}
return
value->
IsTrue
();
}
int
JSStream::ReadStart
() {
HandleScope
scope
(
env
()->
isolate
());
Context::Scope
context_scope
(
env
()->
context
());
TryCatchScope
try_catch
(
env
());
Local<Value> value;
int
value_int =
UV_EPROTO
;
if
(!
MakeCallback
(
env
()->
onreadstart_string
(),
0
,
nullptr
).
ToLocal
(&value) ||
!value->
Int32Value
(
env
()->
context
()).
To
(&value_int)) {
if
(try_catch.
HasCaught
() && !try_catch.
HasTerminated
())
errors::TriggerUncaughtException
(
env
()->
isolate
(), try_catch);
}
return
value_int;
}
int
JSStream::ReadStop
() {
HandleScope
scope
(
env
()->
isolate
());
Context::Scope
context_scope
(
env
()->
context
());
TryCatchScope
try_catch
(
env
());
Local<Value> value;
int
value_int =
UV_EPROTO
;
if
(!
MakeCallback
(
env
()->
onreadstop_string
(),
0
,
nullptr
).
ToLocal
(&value) ||
!value->
Int32Value
(
env
()->
context
()).
To
(&value_int)) {
if
(try_catch.
HasCaught
() && !try_catch.
HasTerminated
())
errors::TriggerUncaughtException
(
env
()->
isolate
(), try_catch);
}
return
value_int;
}
int
JSStream::DoShutdown
(ShutdownWrap* req_wrap) {
HandleScope
scope
(
env
()->
isolate
());
Context::Scope
context_scope
(
env
()->
context
());
Local<Value> argv[] = {
req_wrap->
object
()
};
TryCatchScope
try_catch
(
env
());
Local<Value> value;
int
value_int =
UV_EPROTO
;
if
(!
MakeCallback
(
env
()->
onshutdown_string
(),
arraysize
(argv),
argv).
ToLocal
(&value) ||
!value->
Int32Value
(
env
()->
context
()).
To
(&value_int)) {
if
(try_catch.
HasCaught
() && !try_catch.
HasTerminated
())
errors::TriggerUncaughtException
(
env
()->
isolate
(), try_catch);
}
return
value_int;
}
int
JSStream::DoWrite
(WriteWrap* w,
uv_buf_t
* bufs,
size_t
count,
uv_stream_t
* send_handle) {
CHECK_NULL
(send_handle);
HandleScope
scope
(
env
()->
isolate
());
Context::Scope
context_scope
(
env
()->
context
());
MaybeStackBuffer<Local<Value>,
16
>
bufs_arr
(count);
for
(
size_t
i =
0
; i < count; i++) {
bufs_arr[i] =
Buffer::Copy
(
env
(), bufs[i].
base
, bufs[i].
len
).
ToLocalChecked
();
}
Local<Value> argv[] = {
w->
object
(),
Array::New
(
env
()->
isolate
(), bufs_arr.
out
(), count)
};
TryCatchScope
try_catch
(
env
());
Local<Value> value;
int
value_int =
UV_EPROTO
;
if
(!
MakeCallback
(
env
()->
onwrite_string
(),
arraysize
(argv),
argv).
ToLocal
(&value) ||
!value->
Int32Value
(
env
()->
context
()).
To
(&value_int)) {
if
(try_catch.
HasCaught
() && !try_catch.
HasTerminated
())
errors::TriggerUncaughtException
(
env
()->
isolate
(), try_catch);
}
return
value_int;
}
void
JSStream::New
(
const
FunctionCallbackInfo<Value>& args) {
//
This constructor should not be exposed to public javascript.
//
Therefore we assert that we are not trying to call this as a
//
normal function.
CHECK
(args.
IsConstructCall
());
Environment* env =
Environment::GetCurrent
(args);
new
JSStream
(env, args.
This
());
}
template
<
class
Wrap
>
void
JSStream::Finish
(
const
FunctionCallbackInfo<Value>& args) {
CHECK
(args[
0
]->
IsObject
());
Wrap* w =
static_cast
<Wrap*>(
StreamReq::FromObject
(args[
0
].
As
<Object>()));
CHECK
(args[
1
]->
IsInt32
());
w->
Done
(args[
1
].
As
<Int32>()->
Value
());
}
void
JSStream::ReadBuffer
(
const
FunctionCallbackInfo<Value>& args) {
JSStream* wrap;
ASSIGN_OR_RETURN_UNWRAP
(&wrap, args.
Holder
());
ArrayBufferViewContents<
char
>
buffer
(args[
0
]);
const
char
* data = buffer.
data
();
int
len = buffer.
length
();
//
Repeatedly ask the stream's owner for memory, copy the data that we
//
just read from JS into those buffers and emit them as reads.
while
(len !=
0
) {
uv_buf_t
buf = wrap->
EmitAlloc
(len);
ssize_t
avail = len;
if
(
static_cast
<
ssize_t
>(buf.
len
) < avail)
avail = buf.
len
;
memcpy
(buf.
base
, data, avail);
data += avail;
len -=
static_cast
<
int
>(avail);
wrap->
EmitRead
(avail, buf);
}
}
void
JSStream::EmitEOF
(
const
FunctionCallbackInfo<Value>& args) {
JSStream* wrap;
ASSIGN_OR_RETURN_UNWRAP
(&wrap, args.
Holder
());
wrap->
EmitRead
(
UV_EOF
);
}
void
JSStream::Initialize
(Local<Object> target,
Local<Value> unused,
Local<Context> context,
void
* priv) {
Environment* env =
Environment::GetCurrent
(context);
Isolate* isolate = env->
isolate
();
Local<FunctionTemplate> t =
NewFunctionTemplate
(isolate, New);
t->
InstanceTemplate
()
->
SetInternalFieldCount
(StreamBase::
kInternalFieldCount
);
t->
Inherit
(
AsyncWrap::GetConstructorTemplate
(env));
SetProtoMethod
(isolate, t,
"
finishWrite
"
, Finish<WriteWrap>);
SetProtoMethod
(isolate, t,
"
finishShutdown
"
, Finish<ShutdownWrap>);
SetProtoMethod
(isolate, t,
"
readBuffer
"
, ReadBuffer);
SetProtoMethod
(isolate, t,
"
emitEOF
"
, EmitEOF);
StreamBase::AddMethods
(env, t);
SetConstructorFunction
(context, target,
"
JSStream
"
, t);
}
}
//
namespace node
NODE_BINDING_CONTEXT_AWARE_INTERNAL
(js_stream, node::JSStream::Initialize)
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