1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
#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)
|
