node/src/node_http_parser.cc at master · daviom/node · GitHub

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// Copyright Joyent, Inc. and other Node contributors.

// Permission is hereby granted, free of charge, to any person obtaining a

// copy of this software and associated documentation files (the

// "Software"), to deal in the Software without restriction, including

// without limitation the rights to use, copy, modify, merge, publish,

// distribute, sublicense, and/or sell copies of the Software, and to permit

// persons to whom the Software is furnished to do so, subject to the

// following conditions:

// The above copyright notice and this permission notice shall be included

// in all copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN

// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,

// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE

// USE OR OTHER DEALINGS IN THE SOFTWARE.

#include "node_http_parser.h"

#include "v8.h"

#include "node.h"

#include "node_buffer.h"

#include <string.h> /* strdup() */

#if !defined(_MSC_VER)

#include <strings.h> /* strcasecmp() */

#else

#define strcasecmp _stricmp

#endif

#include <stdlib.h> /* free() */

// 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 namespace v8;

static Persistent<String> on_headers_sym;

static Persistent<String> on_headers_complete_sym;

static Persistent<String> on_body_sym;

static Persistent<String> on_message_complete_sym;

static Persistent<String> method_sym;

static Persistent<String> status_code_sym;

static Persistent<String> http_version_sym;

static Persistent<String> version_major_sym;

static Persistent<String> version_minor_sym;

static Persistent<String> should_keep_alive_sym;

static Persistent<String> upgrade_sym;

static Persistent<String> headers_sym;

static Persistent<String> url_sym;

static Persistent<String> unknown_method_sym;

#define X(num, name, string) static Persistent<String> name##_sym;

HTTP_METHOD_MAP(X)

#undef X

static struct http_parser_settings settings;

// 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.

static Local<Value>* current_buffer;

static char* current_buffer_data;

static size_t current_buffer_len;

#define HTTP_CB(name) \

static int name(http_parser* p_) { \

Parser* self = container_of(p_, Parser, parser_); \

return self->name##_(); \

} \

int name##_()

#define HTTP_DATA_CB(name) \

static int name(http_parser* p_, const char* at, size_t length) { \

Parser* self = container_of(p_, Parser, parser_); \

return self->name##_(at, length); \

} \

int name##_(const char* at, size_t length)

static inline Persistent<String>

method_to_str(unsigned short m) {

switch (m) {

#define X(num, name, string) case HTTP_##name: return name##_sym;

HTTP_METHOD_MAP(X)

#undef X

}

return unknown_method_sym;

}

// 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_ = NULL;

size_ = 0;

}

void Update(const char* str, size_t size) {

if (str_ == NULL)

str_ = str;

else if (on_heap_ || str_ + size_ != str) {

// Non-consecutive input, make a copy on the heap.

// TODO 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() const {

if (str_)

return String::New(str_, size_);

else

return String::Empty();

}

const char* str_;

bool on_heap_;

size_t size_;

};

class Parser : public ObjectWrap {

public:

Parser(enum http_parser_type type) : ObjectWrap() {

Init(type);

}

~Parser() {

}

HTTP_CB(on_message_begin) {

num_fields_ = num_values_ = 0;

url_.Reset();

return 0;

}

HTTP_DATA_CB(on_url) {

url_.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();

}

assert(num_fields_ < (int)ARRAY_SIZE(fields_));

assert(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();

}

assert(num_values_ < (int)ARRAY_SIZE(values_));

assert(num_values_ == num_fields_);

values_[num_values_ - 1].Update(at, length);

return 0;

}

HTTP_CB(on_headers_complete) {

Local<Value> cb = handle_->Get(on_headers_complete_sym);

if (!cb->IsFunction())

return 0;

Local<Object> message_info = Object::New();

if (have_flushed_) {

// Slow case, flush remaining headers.

Flush();

}

else {

// Fast case, pass headers and URL to JS land.

message_info->Set(headers_sym, CreateHeaders());

if (parser_.type == HTTP_REQUEST)

message_info->Set(url_sym, url_.ToString());

}

num_fields_ = num_values_ = 0;

// METHOD

if (parser_.type == HTTP_REQUEST) {

message_info->Set(method_sym, method_to_str(parser_.method));

}

// STATUS

if (parser_.type == HTTP_RESPONSE) {

message_info->Set(status_code_sym, Integer::New(parser_.status_code));

}

// VERSION

message_info->Set(version_major_sym, Integer::New(parser_.http_major));

message_info->Set(version_minor_sym, Integer::New(parser_.http_minor));

message_info->Set(should_keep_alive_sym,

http_should_keep_alive(&parser_) ? True() : False());

message_info->Set(upgrade_sym, parser_.upgrade ? True() : False());

Local<Value> argv[1] = { message_info };

Local<Value> head_response =

Local<Function>::Cast(cb)->Call(handle_, 1, argv);

if (head_response.IsEmpty()) {

got_exception_ = true;

return -1;

}

return head_response->IsTrue() ? 1 : 0;

}

HTTP_DATA_CB(on_body) {

HandleScope scope;

Local<Value> cb = handle_->Get(on_body_sym);

if (!cb->IsFunction())

return 0;

Local<Value> argv[3] = {

*current_buffer,

Integer::New(at - current_buffer_data),

Integer::New(length)

};

Local<Value> r = Local<Function>::Cast(cb)->Call(handle_, 3, argv);

if (r.IsEmpty()) {

got_exception_ = true;

return -1;

}

return 0;

}

HTTP_CB(on_message_complete) {

HandleScope scope;

if (num_fields_)

Flush(); // Flush trailing HTTP headers.

Local<Value> cb = handle_->Get(on_message_complete_sym);

if (!cb->IsFunction())

return 0;

Local<Value> r = Local<Function>::Cast(cb)->Call(handle_, 0, NULL);

if (r.IsEmpty()) {

got_exception_ = true;

return -1;

}

return 0;

}

static Handle<Value> New(const Arguments& args) {

HandleScope scope;

http_parser_type type =

static_cast<http_parser_type>(args[0]->Int32Value());

if (type != HTTP_REQUEST && type != HTTP_RESPONSE) {

return ThrowException(Exception::Error(String::New(

"Argument must be HTTPParser.REQUEST or HTTPParser.RESPONSE")));

}

Parser* parser = new Parser(type);

parser->Wrap(args.This());

return args.This();

}

void Save() {

url_.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, off, len);

static Handle<Value> Execute(const Arguments& args) {

HandleScope scope;

Parser* parser = ObjectWrap::Unwrap<Parser>(args.This());

assert(!current_buffer);

assert(!current_buffer_data);

if (current_buffer) {

return ThrowException(Exception::TypeError(

String::New("Already parsing a buffer")));

}

Local<Value> buffer_v = args[0];

if (!Buffer::HasInstance(buffer_v)) {

return ThrowException(Exception::TypeError(

String::New("Argument should be a buffer")));

}

Local<Object> buffer_obj = buffer_v->ToObject();

char *buffer_data = Buffer::Data(buffer_obj);

size_t buffer_len = Buffer::Length(buffer_obj);

size_t off = args[1]->Int32Value();

if (off >= buffer_len) {

return ThrowException(Exception::Error(

String::New("Offset is out of bounds")));

}

size_t len = args[2]->Int32Value();

if (off+len > buffer_len) {

return ThrowException(Exception::Error(

String::New("off + len > buffer.length")));

}

// Assign 'buffer_' while we parse. The callbacks will access that varible.

current_buffer = &buffer_v;

current_buffer_data = buffer_data;

current_buffer_len = buffer_len;

parser->got_exception_ = false;

size_t nparsed =

http_parser_execute(&parser->parser_, &settings, buffer_data + off, len);

parser->Save();

// Unassign the 'buffer_' variable

assert(current_buffer);

current_buffer = NULL;

current_buffer_data = NULL;

// If there was an exception in one of the callbacks

if (parser->got_exception_) return Local<Value>();

Local<Integer> nparsed_obj = Integer::New(nparsed);

// If there was a parse error in one of the callbacks

// TODO What if there is an error on EOF?

if (!parser->parser_.upgrade && nparsed != len) {

enum http_errno err = HTTP_PARSER_ERRNO(&parser->parser_);

Local<Value> e = Exception::Error(String::NewSymbol("Parse Error"));

Local<Object> obj = e->ToObject();

obj->Set(String::NewSymbol("bytesParsed"), nparsed_obj);

obj->Set(String::NewSymbol("code"), String::New(http_errno_name(err)));

return scope.Close(e);

} else {

return scope.Close(nparsed_obj);

}

static Handle<Value> Finish(const Arguments& args) {

HandleScope scope;

Parser* parser = ObjectWrap::Unwrap<Parser>(args.This());

assert(!current_buffer);

parser->got_exception_ = false;

int rv = http_parser_execute(&(parser->parser_), &settings, NULL, 0);

if (parser->got_exception_) return Local<Value>();

if (rv != 0) {

enum http_errno err = HTTP_PARSER_ERRNO(&parser->parser_);

Local<Value> e = Exception::Error(String::NewSymbol("Parse Error"));

Local<Object> obj = e->ToObject();

obj->Set(String::NewSymbol("bytesParsed"), Integer::New(0));

obj->Set(String::NewSymbol("code"), String::New(http_errno_name(err)));

return scope.Close(e);

}

return Undefined();

}

static Handle<Value> Reinitialize(const Arguments& args) {

HandleScope scope;

http_parser_type type =

static_cast<http_parser_type>(args[0]->Int32Value());

if (type != HTTP_REQUEST && type != HTTP_RESPONSE) {

return ThrowException(Exception::Error(String::New(

"Argument must be HTTPParser.REQUEST or HTTPParser.RESPONSE")));

}

Parser* parser = ObjectWrap::Unwrap<Parser>(args.This());

parser->Init(type);

return Undefined();

}

private:

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(2 * num_values_);

for (int i = 0; i < num_values_; ++i) {

headers->Set(2 * i, fields_[i].ToString());

headers->Set(2 * i + 1, values_[i].ToString());

}

return headers;

}

// spill headers and request path to JS land

void Flush() {

HandleScope scope;

Local<Value> cb = handle_->Get(on_headers_sym);

if (!cb->IsFunction())

return;

Local<Value> argv[2] = {

CreateHeaders(),

url_.ToString()

};

Local<Value> r = Local<Function>::Cast(cb)->Call(handle_, 2, 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();

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_;

int num_fields_;

int num_values_;

bool have_flushed_;

bool got_exception_;

};

void InitHttpParser(Handle<Object> target) {

HandleScope scope;

Local<FunctionTemplate> t = FunctionTemplate::New(Parser::New);

t->InstanceTemplate()->SetInternalFieldCount(1);

t->SetClassName(String::NewSymbol("HTTPParser"));

PropertyAttribute attrib = (PropertyAttribute) (ReadOnly | DontDelete);

t->Set(String::NewSymbol("REQUEST"), Integer::New(HTTP_REQUEST), attrib);

t->Set(String::NewSymbol("RESPONSE"), Integer::New(HTTP_RESPONSE), attrib);

NODE_SET_PROTOTYPE_METHOD(t, "execute", Parser::Execute);

NODE_SET_PROTOTYPE_METHOD(t, "finish", Parser::Finish);

NODE_SET_PROTOTYPE_METHOD(t, "reinitialize", Parser::Reinitialize);

target->Set(String::NewSymbol("HTTPParser"), t->GetFunction());

on_headers_sym = NODE_PSYMBOL("onHeaders");

on_headers_complete_sym = NODE_PSYMBOL("onHeadersComplete");

on_body_sym = NODE_PSYMBOL("onBody");

on_message_complete_sym = NODE_PSYMBOL("onMessageComplete");

#define X(num, name, string) name##_sym = NODE_PSYMBOL(#string);

HTTP_METHOD_MAP(X)

#undef X

unknown_method_sym = NODE_PSYMBOL("UNKNOWN_METHOD");

method_sym = NODE_PSYMBOL("method");

status_code_sym = NODE_PSYMBOL("statusCode");

http_version_sym = NODE_PSYMBOL("httpVersion");

version_major_sym = NODE_PSYMBOL("versionMajor");

version_minor_sym = NODE_PSYMBOL("versionMinor");

should_keep_alive_sym = NODE_PSYMBOL("shouldKeepAlive");

upgrade_sym = NODE_PSYMBOL("upgrade");

headers_sym = NODE_PSYMBOL("headers");

url_sym = NODE_PSYMBOL("url");

settings.on_message_begin = Parser::on_message_begin;

settings.on_url = Parser::on_url;

settings.on_header_field = Parser::on_header_field;

settings.on_header_value = Parser::on_header_value;

settings.on_headers_complete = Parser::on_headers_complete;

settings.on_body = Parser::on_body;

settings.on_message_complete = Parser::on_message_complete;

}

} // namespace node

NODE_MODULE(node_http_parser, node::InitHttpParser)

node/src/node_http_parser.cc at master · daviom/node · GitHub

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