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#include "node.h"
#include "node_buffer.h"
#include "node_http_parser.h"
#include "async-wrap.h"
#include "async-wrap-inl.h"
#include "env.h"
#include "env-inl.h"
#include "stream_base.h"
#include "stream_base-inl.h"
#include "util.h"
#include "util-inl.h"
#include "v8.h"
#include <stdlib.h> // free()
#include <string.h> // strdup()
#if defined(_MSC_VER)
#define strcasecmp _stricmp
#else
#include <strings.h> // strcasecmp()
#endif
// This is a binding to http_parser (https://github.com/joyent/http-parser)
// The goal is to decouple sockets from parsing for more javascript-level
// agility. A Buffer is read from a socket and passed to parser.execute().
// The parser then issues callbacks with slices of the data
// parser.onMessageBegin
// parser.onPath
// parser.onBody
// ...
// No copying is performed when slicing the buffer, only small reference
// allocations.
namespace node {
using v8::Array;
using v8::Boolean;
using v8::Context;
using v8::EscapableHandleScope;
using v8::Exception;
using v8::Function;
using v8::FunctionCallbackInfo;
using v8::FunctionTemplate;
using v8::HandleScope;
using v8::Integer;
using v8::Local;
using v8::Object;
using v8::String;
using v8::Uint32;
using v8::Undefined;
using v8::Value;
const uint32_t kOnHeaders = 0;
const uint32_t kOnHeadersComplete = 1;
const uint32_t kOnBody = 2;
const uint32_t kOnMessageComplete = 3;
const uint32_t kOnExecute = 4;
#define HTTP_CB(name) \
static int name(http_parser* p_) { \
Parser* self = ContainerOf(&Parser::parser_, p_); \
return self->name##_(); \
} \
int name##_()
#define HTTP_DATA_CB(name) \
static int name(http_parser* p_, const char* at, size_t length) { \
Parser* self = ContainerOf(&Parser::parser_, p_); \
return self->name##_(at, length); \
} \
int name##_(const char* at, size_t length)
// helper class for the Parser
struct StringPtr {
StringPtr() {
on_heap_ = false;
Reset();
}
~StringPtr() {
Reset();
}
// If str_ does not point to a heap string yet, this function makes it do
// so. This is called at the end of each http_parser_execute() so as not
// to leak references. See issue #2438 and test-http-parser-bad-ref.js.
void Save() {
if (!on_heap_ && size_ > 0) {
char* s = new char[size_];
memcpy(s, str_, size_);
str_ = s;
on_heap_ = true;
}
}
void Reset() {
if (on_heap_) {
delete[] str_;
on_heap_ = false;
}
str_ = nullptr;
size_ = 0;
}
void Update(const char* str, size_t size) {
if (str_ == nullptr)
str_ = str;
else if (on_heap_ || str_ + size_ != str) {
// Non-consecutive input, make a copy on the heap.
// TODO(bnoordhuis) Use slab allocation, O(n) allocs is bad.
char* s = new char[size_ + size];
memcpy(s, str_, size_);
memcpy(s + size_, str, size);
if (on_heap_)
delete[] str_;
else
on_heap_ = true;
str_ = s;
}
size_ += size;
}
Local<String> ToString(Environment* env) const {
if (str_)
return OneByteString(env->isolate(), str_, size_);
else
return String::Empty(env->isolate());
}
const char* str_;
bool on_heap_;
size_t size_;
};
class Parser : public AsyncWrap {
public:
Parser(Environment* env, Local<Object> wrap, enum http_parser_type type)
: AsyncWrap(env, wrap, AsyncWrap::PROVIDER_HTTPPARSER),
current_buffer_len_(0),
current_buffer_data_(nullptr) {
Wrap(object(), this);
Init(type);
}
~Parser() override {
ClearWrap(object());
persistent().Reset();
}
size_t self_size() const override {
return sizeof(*this);
}
HTTP_CB(on_message_begin) {
num_fields_ = num_values_ = 0;
url_.Reset();
status_message_.Reset();
return 0;
}
HTTP_DATA_CB(on_url) {
url_.Update(at, length);
return 0;
}
HTTP_DATA_CB(on_status) {
status_message_.Update(at, length);
return 0;
}
HTTP_DATA_CB(on_header_field) {
if (num_fields_ == num_values_) {
// start of new field name
num_fields_++;
if (num_fields_ == ARRAY_SIZE(fields_)) {
// ran out of space - flush to javascript land
Flush();
num_fields_ = 1;
num_values_ = 0;
}
fields_[num_fields_ - 1].Reset();
}
CHECK_LT(num_fields_, static_cast<int>(ARRAY_SIZE(fields_)));
CHECK_EQ(num_fields_, num_values_ + 1);
fields_[num_fields_ - 1].Update(at, length);
return 0;
}
HTTP_DATA_CB(on_header_value) {
if (num_values_ != num_fields_) {
// start of new header value
num_values_++;
values_[num_values_ - 1].Reset();
}
CHECK_LT(num_values_, static_cast<int>(ARRAY_SIZE(values_)));
CHECK_EQ(num_values_, num_fields_);
values_[num_values_ - 1].Update(at, length);
return 0;
}
HTTP_CB(on_headers_complete) {
// Arguments for the on-headers-complete javascript callback. This
// list needs to be kept in sync with the actual argument list for
// `parserOnHeadersComplete` in lib/_http_common.js.
enum on_headers_complete_arg_index {
A_VERSION_MAJOR = 0,
A_VERSION_MINOR,
A_HEADERS,
A_METHOD,
A_URL,
A_STATUS_CODE,
A_STATUS_MESSAGE,
A_UPGRADE,
A_SHOULD_KEEP_ALIVE,
A_MAX
};
Local<Value> argv[A_MAX];
Local<Object> obj = object();
Local<Value> cb = obj->Get(kOnHeadersComplete);
if (!cb->IsFunction())
return 0;
Local<Value> undefined = Undefined(env()->isolate());
for (size_t i = 0; i < ARRAY_SIZE(argv); i++)
argv[i] = undefined;
if (have_flushed_) {
// Slow case, flush remaining headers.
Flush();
} else {
// Fast case, pass headers and URL to JS land.
argv[A_HEADERS] = CreateHeaders();
if (parser_.type == HTTP_REQUEST)
argv[A_URL] = url_.ToString(env());
}
num_fields_ = 0;
num_values_ = 0;
// METHOD
if (parser_.type == HTTP_REQUEST) {
argv[A_METHOD] =
Uint32::NewFromUnsigned(env()->isolate(), parser_.method);
}
// STATUS
if (parser_.type == HTTP_RESPONSE) {
argv[A_STATUS_CODE] =
Integer::New(env()->isolate(), parser_.status_code);
argv[A_STATUS_MESSAGE] = status_message_.ToString(env());
}
// VERSION
argv[A_VERSION_MAJOR] = Integer::New(env()->isolate(), parser_.http_major);
argv[A_VERSION_MINOR] = Integer::New(env()->isolate(), parser_.http_minor);
argv[A_SHOULD_KEEP_ALIVE] =
Boolean::New(env()->isolate(), http_should_keep_alive(&parser_));
argv[A_UPGRADE] = Boolean::New(env()->isolate(), parser_.upgrade);
Environment::AsyncCallbackScope callback_scope(env());
Local<Value> head_response =
MakeCallback(cb.As<Function>(), ARRAY_SIZE(argv), argv);
if (head_response.IsEmpty()) {
got_exception_ = true;
return -1;
}
return head_response->IsTrue() ? 1 : 0;
}
HTTP_DATA_CB(on_body) {
EscapableHandleScope scope(env()->isolate());
Local<Object> obj = object();
Local<Value> cb = obj->Get(kOnBody);
if (!cb->IsFunction())
return 0;
// We came from consumed stream
if (current_buffer_.IsEmpty()) {
// Make sure Buffer will be in parent HandleScope
current_buffer_ = scope.Escape(Buffer::Copy(
env()->isolate(),
current_buffer_data_,
current_buffer_len_).ToLocalChecked());
}
Local<Value> argv[3] = {
current_buffer_,
Integer::NewFromUnsigned(env()->isolate(), at - current_buffer_data_),
Integer::NewFromUnsigned(env()->isolate(), length)
};
Local<Value> r = MakeCallback(cb.As<Function>(), ARRAY_SIZE(argv), argv);
if (r.IsEmpty()) {
got_exception_ = true;
return -1;
}
return 0;
}
HTTP_CB(on_message_complete) {
HandleScope scope(env()->isolate());
if (num_fields_)
Flush(); // Flush trailing HTTP headers.
Local<Object> obj = object();
Local<Value> cb = obj->Get(kOnMessageComplete);
if (!cb->IsFunction())
return 0;
Environment::AsyncCallbackScope callback_scope(env());
Local<Value> r = MakeCallback(cb.As<Function>(), 0, nullptr);
if (r.IsEmpty()) {
got_exception_ = true;
return -1;
}
return 0;
}
static void New(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
http_parser_type type =
static_cast<http_parser_type>(args[0]->Int32Value());
CHECK(type == HTTP_REQUEST || type == HTTP_RESPONSE);
new Parser(env, args.This(), type);
}
static void Close(const FunctionCallbackInfo<Value>& args) {
Parser* parser = Unwrap<Parser>(args.Holder());
if (--parser->refcount_ == 0)
delete parser;
}
void Save() {
url_.Save();
status_message_.Save();
for (int i = 0; i < num_fields_; i++) {
fields_[i].Save();
}
for (int i = 0; i < num_values_; i++) {
values_[i].Save();
}
}
// var bytesParsed = parser->execute(buffer);
static void Execute(const FunctionCallbackInfo<Value>& args) {
Parser* parser = Unwrap<Parser>(args.Holder());
CHECK(parser->current_buffer_.IsEmpty());
CHECK_EQ(parser->current_buffer_len_, 0);
CHECK_EQ(parser->current_buffer_data_, nullptr);
CHECK_EQ(Buffer::HasInstance(args[0]), true);
Local<Object> buffer_obj = args[0].As<Object>();
char* buffer_data = Buffer::Data(buffer_obj);
size_t buffer_len = Buffer::Length(buffer_obj);
// This is a hack to get the current_buffer to the callbacks with the least
// amount of overhead. Nothing else will run while http_parser_execute()
// runs, therefore this pointer can be set and used for the execution.
parser->current_buffer_ = buffer_obj;
Local<Value> ret = parser->Execute(buffer_data, buffer_len);
if (!ret.IsEmpty())
args.GetReturnValue().Set(ret);
}
static void Finish(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
Parser* parser = Unwrap<Parser>(args.Holder());
CHECK(parser->current_buffer_.IsEmpty());
parser->got_exception_ = false;
int rv = http_parser_execute(&(parser->parser_), &settings, nullptr, 0);
if (parser->got_exception_)
return;
if (rv != 0) {
enum http_errno err = HTTP_PARSER_ERRNO(&parser->parser_);
Local<Value> e = Exception::Error(env->parse_error_string());
Local<Object> obj = e->ToObject(env->isolate());
obj->Set(env->bytes_parsed_string(), Integer::New(env->isolate(), 0));
obj->Set(env->code_string(),
OneByteString(env->isolate(), http_errno_name(err)));
args.GetReturnValue().Set(e);
}
}
static void Reinitialize(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
http_parser_type type =
static_cast<http_parser_type>(args[0]->Int32Value());
CHECK(type == HTTP_REQUEST || type == HTTP_RESPONSE);
Parser* parser = Unwrap<Parser>(args.Holder());
// Should always be called from the same context.
CHECK_EQ(env, parser->env());
parser->Init(type);
}
template <bool should_pause>
static void Pause(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
Parser* parser = Unwrap<Parser>(args.Holder());
// Should always be called from the same context.
CHECK_EQ(env, parser->env());
http_parser_pause(&parser->parser_, should_pause);
}
static void Consume(const FunctionCallbackInfo<Value>& args) {
Parser* parser = Unwrap<Parser>(args.Holder());
Local<External> stream_obj = args[0].As<External>();
StreamBase* stream = static_cast<StreamBase*>(stream_obj->Value());
CHECK_NE(stream, nullptr);
stream->Consume();
parser->prev_alloc_cb_ = stream->alloc_cb();
parser->prev_read_cb_ = stream->read_cb();
stream->set_alloc_cb({ OnAllocImpl, parser });
stream->set_read_cb({ OnReadImpl, parser });
}
static void Unconsume(const FunctionCallbackInfo<Value>& args) {
Parser* parser = Unwrap<Parser>(args.Holder());
// Already unconsumed
if (parser->prev_alloc_cb_.is_empty())
return;
// Restore stream's callbacks
if (args.Length() == 1 && args[0]->IsExternal()) {
Local<External> stream_obj = args[0].As<External>();
StreamBase* stream = static_cast<StreamBase*>(stream_obj->Value());
CHECK_NE(stream, nullptr);
stream->set_alloc_cb(parser->prev_alloc_cb_);
stream->set_read_cb(parser->prev_read_cb_);
}
parser->prev_alloc_cb_.clear();
parser->prev_read_cb_.clear();
}
static void GetCurrentBuffer(const FunctionCallbackInfo<Value>& args) {
Parser* parser = Unwrap<Parser>(args.Holder());
Local<Object> ret = Buffer::Copy(
parser->env(),
parser->current_buffer_data_,
parser->current_buffer_len_).ToLocalChecked();
args.GetReturnValue().Set(ret);
}
protected:
class ScopedRetainParser {
public:
explicit ScopedRetainParser(Parser* p) : p_(p) {
CHECK_GT(p_->refcount_, 0);
p_->refcount_++;
}
~ScopedRetainParser() {
if (0 == --p_->refcount_)
delete p_;
}
private:
Parser* const p_;
};
static const size_t kAllocBufferSize = 64 * 1024;
static void OnAllocImpl(size_t suggested_size, uv_buf_t* buf, void* ctx) {
Parser* parser = static_cast<Parser*>(ctx);
Environment* env = parser->env();
if (env->http_parser_buffer() == nullptr)
env->set_http_parser_buffer(new char[kAllocBufferSize]);
buf->base = env->http_parser_buffer();
buf->len = kAllocBufferSize;
}
static void OnReadImpl(ssize_t nread,
const uv_buf_t* buf,
uv_handle_type pending,
void* ctx) {
Parser* parser = static_cast<Parser*>(ctx);
HandleScope scope(parser->env()->isolate());
if (nread < 0) {
uv_buf_t tmp_buf;
tmp_buf.base = nullptr;
tmp_buf.len = 0;
parser->prev_read_cb_.fn(nread,
&tmp_buf,
pending,
parser->prev_read_cb_.ctx);
return;
}
// Ignore, empty reads have special meaning in http parser
if (nread == 0)
return;
ScopedRetainParser retain(parser);
parser->current_buffer_.Clear();
Local<Value> ret = parser->Execute(buf->base, nread);
// Exception
if (ret.IsEmpty())
return;
Local<Object> obj = parser->object();
Local<Value> cb = obj->Get(kOnExecute);
if (!cb->IsFunction())
return;
Environment::AsyncCallbackScope callback_scope(parser->env());
// Hooks for GetCurrentBuffer
parser->current_buffer_len_ = nread;
parser->current_buffer_data_ = buf->base;
parser->MakeCallback(cb.As<Function>(), 1, &ret);
parser->current_buffer_len_ = 0;
parser->current_buffer_data_ = nullptr;
parser->env()->KickNextTick(&callback_scope);
}
Local<Value> Execute(char* data, size_t len) {
EscapableHandleScope scope(env()->isolate());
current_buffer_len_ = len;
current_buffer_data_ = data;
got_exception_ = false;
size_t nparsed =
http_parser_execute(&parser_, &settings, data, len);
Save();
// Unassign the 'buffer_' variable
current_buffer_.Clear();
current_buffer_len_ = 0;
current_buffer_data_ = nullptr;
// If there was an exception in one of the callbacks
if (got_exception_)
return scope.Escape(Local<Value>());
Local<Integer> nparsed_obj = Integer::New(env()->isolate(), nparsed);
// If there was a parse error in one of the callbacks
// TODO(bnoordhuis) What if there is an error on EOF?
if (!parser_.upgrade && nparsed != len) {
enum http_errno err = HTTP_PARSER_ERRNO(&parser_);
Local<Value> e = Exception::Error(env()->parse_error_string());
Local<Object> obj = e->ToObject(env()->isolate());
obj->Set(env()->bytes_parsed_string(), nparsed_obj);
obj->Set(env()->code_string(),
OneByteString(env()->isolate(), http_errno_name(err)));
return scope.Escape(e);
}
return scope.Escape(nparsed_obj);
}
Local<Array> CreateHeaders() {
// num_values_ is either -1 or the entry # of the last header
// so num_values_ == 0 means there's a single header
Local<Array> headers = Array::New(env()->isolate());
Local<Function> fn = env()->push_values_to_array_function();
Local<Value> argv[NODE_PUSH_VAL_TO_ARRAY_MAX * 2];
int i = 0;
do {
size_t j = 0;
while (i < num_values_ && j < ARRAY_SIZE(argv) / 2) {
argv[j * 2] = fields_[i].ToString(env());
argv[j * 2 + 1] = values_[i].ToString(env());
i++;
j++;
}
if (j > 0) {
fn->Call(env()->context(), headers, j * 2, argv).ToLocalChecked();
}
} while (i < num_values_);
return headers;
}
// spill headers and request path to JS land
void Flush() {
HandleScope scope(env()->isolate());
Local<Object> obj = object();
Local<Value> cb = obj->Get(kOnHeaders);
if (!cb->IsFunction())
return;
Local<Value> argv[2] = {
CreateHeaders(),
url_.ToString(env())
};
Local<Value> r = MakeCallback(cb.As<Function>(), ARRAY_SIZE(argv), argv);
if (r.IsEmpty())
got_exception_ = true;
url_.Reset();
have_flushed_ = true;
}
void Init(enum http_parser_type type) {
http_parser_init(&parser_, type);
url_.Reset();
status_message_.Reset();
num_fields_ = 0;
num_values_ = 0;
have_flushed_ = false;
got_exception_ = false;
}
http_parser parser_;
StringPtr fields_[32]; // header fields
StringPtr values_[32]; // header values
StringPtr url_;
StringPtr status_message_;
int num_fields_;
int num_values_;
bool have_flushed_;
bool got_exception_;
Local<Object> current_buffer_;
size_t current_buffer_len_;
char* current_buffer_data_;
StreamResource::Callback<StreamResource::AllocCb> prev_alloc_cb_;
StreamResource::Callback<StreamResource::ReadCb> prev_read_cb_;
int refcount_ = 1;
static const struct http_parser_settings settings;
friend class ScopedRetainParser;
};
const struct http_parser_settings Parser::settings = {
Parser::on_message_begin,
Parser::on_url,
Parser::on_status,
Parser::on_header_field,
Parser::on_header_value,
Parser::on_headers_complete,
Parser::on_body,
Parser::on_message_complete,
nullptr, // on_chunk_header
nullptr // on_chunk_complete
};
void InitHttpParser(Local<Object> target,
Local<Value> unused,
Local<Context> context,
void* priv) {
Environment* env = Environment::GetCurrent(context);
Local<FunctionTemplate> t = env->NewFunctionTemplate(Parser::New);
t->InstanceTemplate()->SetInternalFieldCount(1);
t->SetClassName(FIXED_ONE_BYTE_STRING(env->isolate(), "HTTPParser"));
t->Set(FIXED_ONE_BYTE_STRING(env->isolate(), "REQUEST"),
Integer::New(env->isolate(), HTTP_REQUEST));
t->Set(FIXED_ONE_BYTE_STRING(env->isolate(), "RESPONSE"),
Integer::New(env->isolate(), HTTP_RESPONSE));
t->Set(FIXED_ONE_BYTE_STRING(env->isolate(), "kOnHeaders"),
Integer::NewFromUnsigned(env->isolate(), kOnHeaders));
t->Set(FIXED_ONE_BYTE_STRING(env->isolate(), "kOnHeadersComplete"),
Integer::NewFromUnsigned(env->isolate(), kOnHeadersComplete));
t->Set(FIXED_ONE_BYTE_STRING(env->isolate(), "kOnBody"),
Integer::NewFromUnsigned(env->isolate(), kOnBody));
t->Set(FIXED_ONE_BYTE_STRING(env->isolate(), "kOnMessageComplete"),
Integer::NewFromUnsigned(env->isolate(), kOnMessageComplete));
t->Set(FIXED_ONE_BYTE_STRING(env->isolate(), "kOnExecute"),
Integer::NewFromUnsigned(env->isolate(), kOnExecute));
Local<Array> methods = Array::New(env->isolate());
#define V(num, name, string) \
methods->Set(num, FIXED_ONE_BYTE_STRING(env->isolate(), #string));
HTTP_METHOD_MAP(V)
#undef V
t->Set(FIXED_ONE_BYTE_STRING(env->isolate(), "methods"), methods);
env->SetProtoMethod(t, "close", Parser::Close);
env->SetProtoMethod(t, "execute", Parser::Execute);
env->SetProtoMethod(t, "finish", Parser::Finish);
env->SetProtoMethod(t, "reinitialize", Parser::Reinitialize);
env->SetProtoMethod(t, "pause", Parser::Pause<true>);
env->SetProtoMethod(t, "resume", Parser::Pause<false>);
env->SetProtoMethod(t, "consume", Parser::Consume);
env->SetProtoMethod(t, "unconsume", Parser::Unconsume);
env->SetProtoMethod(t, "getCurrentBuffer", Parser::GetCurrentBuffer);
target->Set(FIXED_ONE_BYTE_STRING(env->isolate(), "HTTPParser"),
t->GetFunction());
}
} // namespace node
NODE_MODULE_CONTEXT_AWARE_BUILTIN(http_parser, node::InitHttpParser)