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Introduced new chunked transfer encoding parser to remove chunk markers by umennel · Pull Request #720 · cpp-netlib/cpp-netlib · GitHub
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Merged
deanberris merged 7 commits into from
Mar 31, 2017
Merged

Introduced new chunked transfer encoding parser to remove chunk markers #720

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673b853
Introduced new chunked transfer encoding parser to remove chunk marke…
umennel Dec 14, 2016
c4d758a
Applied new remove chunk markers option to tests.
umennel Dec 14, 2016
e9bf5f7
Nicer formatting
umennel Dec 15, 2016
9586a81
Use strongly typed enum.
umennel Dec 15, 2016
c70f774
Clarified and commented expression.
umennel Dec 16, 2016
ff5c7c8
Removed commented lines.
umennel Dec 18, 2016
192d520
Nicer formatting and clean ups
umennel Mar 23, 2017
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3 changes: 2 additions & 1 deletion boost/network/protocol/http/client/async_impl.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -39,14 +39,15 @@ struct async_client

async_client(bool cache_resolved, bool follow_redirect,
bool always_verify_peer, int timeout,
bool remove_chunk_markers,
std::shared_ptr<boost::asio::io_service> service,
optional<string_type> certificate_filename,
optional<string_type> verify_path,
optional<string_type> certificate_file,
optional<string_type> private_key_file,
optional<string_type> ciphers,
optional<string_type> sni_hostname, long ssl_options)
: connection_base(cache_resolved, follow_redirect, timeout),
: connection_base(cache_resolved, follow_redirect, timeout, remove_chunk_markers),
service_ptr(service.get() ? service
: std::make_shared<boost::asio::io_service>()),
service_(*service_ptr),
Expand Down
4 changes: 2 additions & 2 deletions boost/network/protocol/http/client/connection/async_base.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -43,7 +43,7 @@ struct async_connection_base {
// tag.
static connection_ptr new_connection(
resolve_function resolve, resolver_type &resolver, bool follow_redirect,
bool always_verify_peer, bool https, int timeout,
bool always_verify_peer, bool https, int timeout, bool remove_chunk_markers,
optional<string_type> certificate_filename = optional<string_type>(),
optional<string_type> const &verify_path = optional<string_type>(),
optional<string_type> certificate_file = optional<string_type>(),
Expand All @@ -59,7 +59,7 @@ struct async_connection_base {
certificate_filename, verify_path, certificate_file, private_key_file,
ciphers, sni_hostname, ssl_options);
auto temp = std::make_shared<async_connection>(
resolver, resolve, follow_redirect, timeout, std::move(delegate));
resolver, resolve, follow_redirect, timeout, remove_chunk_markers, std::move(delegate));
BOOST_ASSERT(temp != nullptr);
return temp;
}
Expand Down
171 changes: 134 additions & 37 deletions boost/network/protocol/http/client/connection/async_normal.hpp
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Expand Up @@ -11,6 +11,7 @@

#include <iterator>
#include <cstdint>
#include <iostream>
#include <boost/algorithm/string/trim.hpp>
#include <boost/asio/steady_timer.hpp>
#include <boost/asio/placeholders.hpp>
Expand All @@ -37,6 +38,77 @@ namespace network {
namespace http {
namespace impl {

template <class Tag>
struct chunk_encoding_parser {

chunk_encoding_parser() : state(state_t::header), chunk_size(0) {}

enum state_t { header, header_end, data, data_end };

@deanberris deanberris Dec 15, 2016

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I think you can use an enum class here instead.


state_t state;
size_t chunk_size;
std::array<typename char_<Tag>::type, 1024> buffer;

void update_chunk_size(boost::iterator_range<typename std::array<typename char_<Tag>::type, 1024>::const_iterator> const& range) {

@deanberris deanberris Dec 15, 2016

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Yeah, this is a really long line. We prefer using clang-format to make sure we have consistent formatting in the project, so if you don't mind running this patch through it, that would be really good for readability.

if (range.empty())
return;
std::stringstream ss;
ss << std::hex << range;
size_t size;
ss >> size;
chunk_size = (chunk_size << (range.size()*4)) + size;

@deanberris deanberris Dec 15, 2016

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Can you help me understand this math?

If range has a size of 1024, this means chunk_size is shifted left 4096 times?

@umennel umennel Dec 18, 2016

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Yes, but range must correspond to the number of digits and 1024 digits would be an unrealistically large number (it would not throw an error though cause there is no overflow checking). I replaced the '+' with a '|' to make it more clear that this expression is just about appending the new bits to the lower end (and shifting the existing bits by the number of the new bits). Every hex digit corresponds to a quadruple of bits, that's why i multiply the number of digits by four. I didn't want to introduce another char buffer to accumulate the hex digits, so I decided to incrementally compute the chunk size.

}

boost::iterator_range<typename std::array<typename char_<Tag>::type, 1024>::const_iterator> operator()(boost::iterator_range<typename std::array<typename char_<Tag>::type, 1024>::const_iterator> const& range) {
auto iter = boost::begin(range);
auto begin = iter;
auto pos = boost::begin(buffer);

while (iter != boost::end(range))
switch(state) {
case state_t::header:
iter = std::find(iter, boost::end(range), '\r');
update_chunk_size(boost::make_iterator_range(begin, iter));
if (iter != boost::end(range)) {
state = state_t::header_end;
++iter;
}
break;

case state_t::header_end:
BOOST_ASSERT(*iter == '\n');
++iter;
state = state_t::data;
break;

case state_t::data:
if (chunk_size == 0) {
BOOST_ASSERT(*iter == '\r');
++iter;
state = state_t::data_end;
} else {
auto len = std::min(chunk_size, (size_t)std::distance(iter, boost::end(range)));
begin = iter;
iter = std::next(iter, len);
pos = std::copy(begin, iter, pos);
chunk_size -= len;
}
break;

case state_t::data_end:
BOOST_ASSERT (*iter == '\n');
++iter;
begin = iter;
state = state_t::header;
break;

default:
BOOST_ASSERT(false && "Bug, report this to the developers!");
}
return boost::make_iterator_range(boost::begin(buffer), pos);
}
};

template <class Tag, unsigned version_major, unsigned version_minor>
struct async_connection_base;

Expand Down Expand Up @@ -72,8 +144,10 @@ struct http_async_connection

http_async_connection(resolver_type& resolver, resolve_function resolve,
bool follow_redirect, int timeout,
bool remove_chunk_markers,
connection_delegate_ptr delegate)
: timeout_(timeout),
remove_chunk_markers_(remove_chunk_markers),
timer_(resolver.get_io_service()),
is_timedout_(false),
follow_redirect_(follow_redirect),
Expand Down Expand Up @@ -348,8 +422,11 @@ struct http_async_connection

// The invocation of the callback is synchronous to allow us to
// wait before scheduling another read.
callback(make_iterator_range(begin, end), ec);

if (this->is_chunk_encoding && remove_chunk_markers_) {
callback(parse_chunk_encoding(make_iterator_range(begin, end)), ec);
} else {
callback(make_iterator_range(begin, end), ec);
}
auto self = this->shared_from_this();
delegate_->read_some(
boost::asio::mutable_buffers_1(this->part.data(),
Expand Down Expand Up @@ -388,14 +465,28 @@ struct http_async_connection
// We call the callback function synchronously passing the error
// condition (in this case, end of file) so that it can handle it
// appropriately.
callback(make_iterator_range(begin, end), ec);
if (this->is_chunk_encoding && remove_chunk_markers_) {
callback(parse_chunk_encoding(make_iterator_range(begin, end)), ec);
} else {
callback(make_iterator_range(begin, end), ec);
}
} else {
string_type body_string;
std::swap(body_string, this->partial_parsed);
body_string.append(this->part.begin(), this->part.begin() + bytes_transferred);
if (this->is_chunk_encoding) {
this->body_promise.set_value(parse_chunk_encoding(body_string));
if (this->is_chunk_encoding && remove_chunk_markers_) {

@igorpeshansky igorpeshansky Mar 7, 2018 •
edited
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@umennel Careful -- this actually breaks previous behavior. Now, unless you set remove_chunk_markers to true, the following code will produce a chunked-encoded string:

http::client client;
http::client::request request("http://www.boost.org:80/");
http::client::response response = client.get(request);
std::cerr << body(response) << std::endl;

@deanberris Is this what we want?

To put it another way, can you think of a case where we wouldn't want remove_chunk_markers to default to true?

@umennel umennel Mar 15, 2018

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@igorpeshansky, indeed, the default should be true. Otherwise it is hard to keep the behavior consistent. We should decide on this before merging into 0.13.

@igorpeshansky igorpeshansky Mar 15, 2018

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Great, I'll send a PR shortly.

@igorpeshansky igorpeshansky Mar 15, 2018

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Sent #830.

for (size_t i = 0; i < this->partial_parsed.size(); i += 1024) {
auto range = parse_chunk_encoding(
boost::make_iterator_range(this->partial_parsed.data() + i,
this->partial_parsed.data() + std::min(i+1024, this->partial_parsed.size())));
body_string.append(boost::begin(range), boost::end(range));
}
this->partial_parsed.clear();
auto range = parse_chunk_encoding(boost::make_iterator_range(this->part.begin(),
this->part.begin() + bytes_transferred));
body_string.append(boost::begin(range), boost::end(range));
this->body_promise.set_value(body_string);
} else {
std::swap(body_string, this->partial_parsed);
body_string.append(this->part.begin(), this->part.begin() + bytes_transferred);
this->body_promise.set_value(body_string);
}
}
Expand All @@ -417,7 +508,11 @@ struct http_async_connection
this->part.begin();
typename protocol_base::buffer_type::const_iterator end = begin;
std::advance(end, bytes_transferred);
callback(make_iterator_range(begin, end), ec);
if (this->is_chunk_encoding && remove_chunk_markers_) {
callback(parse_chunk_encoding(make_iterator_range(begin, end)), ec);
} else {
callback(make_iterator_range(begin, end), ec);
}
auto self = this->shared_from_this();
delegate_->read_some(
boost::asio::mutable_buffers_1(this->part.data(),
Expand Down Expand Up @@ -476,38 +571,39 @@ struct http_async_connection
}
}

string_type parse_chunk_encoding(string_type& body_string) {
string_type body;
string_type crlf = "\r\n";

typename string_type::iterator begin = body_string.begin();
for (typename string_type::iterator iter =
std::search(begin, body_string.end(), crlf.begin(), crlf.end());
iter != body_string.end();
iter =
std::search(begin, body_string.end(), crlf.begin(), crlf.end())) {
string_type line(begin, iter);
if (line.empty()) {
break;
}
std::stringstream stream(line);
int len;
stream >> std::hex >> len;
std::advance(iter, 2);
if (len == 0) {
break;
}
if (len <= body_string.end() - iter) {
body.insert(body.end(), iter, iter + len);
std::advance(iter, len + 2);
}
begin = iter;
}
// string_type parse_chunk_encoding(string_type& body_string) {
// string_type body;
// string_type crlf = "\r\n";

return body;
}
// typename string_type::iterator begin = body_string.begin();
// for (typename string_type::iterator iter =
// std::search(begin, body_string.end(), crlf.begin(), crlf.end());
// iter != body_string.end();
// iter =
// std::search(begin, body_string.end(), crlf.begin(), crlf.end())) {
// string_type line(begin, iter);
// if (line.empty()) {
// break;
// }
// std::stringstream stream(line);
// int len;
// stream >> std::hex >> len;
// std::advance(iter, 2);
// if (len == 0) {
// break;
// }
// if (len <= body_string.end() - iter) {
// body.insert(body.end(), iter, iter + len);
// std::advance(iter, len + 2);
// }
// begin = iter;
// }

// return body;
// }

@deanberris deanberris Dec 15, 2016

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Consider just removing these lines?


int timeout_;
bool remove_chunk_markers_;
boost::asio::steady_timer timer_;
bool is_timedout_;
bool follow_redirect_;
Expand All @@ -517,6 +613,7 @@ struct http_async_connection
connection_delegate_ptr delegate_;
boost::asio::streambuf command_streambuf;
string_type method;
chunk_encoding_parser<Tag> parse_chunk_encoding;
};

} // namespace impl
Expand Down
3 changes: 2 additions & 1 deletion boost/network/protocol/http/client/facade.hpp
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Expand Up @@ -303,7 +303,8 @@ class basic_client_facade {
options.openssl_verify_path(), options.openssl_certificate_file(),
options.openssl_private_key_file(), options.openssl_ciphers(),
options.openssl_sni_hostname(), options.openssl_options(),
options.io_service(), options.timeout()));
options.io_service(), options.timeout(),
options.remove_chunk_markers()));
}
};

Expand Down
16 changes: 14 additions & 2 deletions boost/network/protocol/http/client/options.hpp
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Expand Up @@ -34,7 +34,8 @@ class client_options {
openssl_options_(0),
io_service_(),
always_verify_peer_(true),
timeout_(0) {}
timeout_(0),
remove_chunk_markers_(false) {}

client_options(client_options const& other)
: cache_resolved_(other.cache_resolved_),
Expand All @@ -48,7 +49,8 @@ class client_options {
openssl_options_(other.openssl_options_),
io_service_(other.io_service_),
always_verify_peer_(other.always_verify_peer_),
timeout_(other.timeout_) {}
timeout_(other.timeout_),
remove_chunk_markers_(other.remove_chunk_markers) {}

client_options& operator=(client_options other) {
other.swap(*this);
Expand All @@ -69,6 +71,7 @@ class client_options {
swap(io_service_, other.io_service_);
swap(always_verify_peer_, other.always_verify_peer_);
swap(timeout_, other.timeout_);
swap(remove_chunk_markers_, other.remove_chunk_markers_);
}

/// Specify whether the client should cache resolved endpoints.
Expand Down Expand Up @@ -154,6 +157,12 @@ class client_options {
return *this;
}

/// Set an overall timeout for HTTP requests.
client_options& remove_chunk_markers(bool v) {
remove_chunk_markers_ = v;
return *this;
}

bool cache_resolved() const { return cache_resolved_; }

bool follow_redirects() const { return follow_redirects_; }
Expand Down Expand Up @@ -190,6 +199,8 @@ class client_options {

int timeout() const { return timeout_; }

bool remove_chunk_markers() const { return remove_chunk_markers_; }

private:
bool cache_resolved_;
bool follow_redirects_;
Expand All @@ -203,6 +214,7 @@ class client_options {
std::shared_ptr<boost::asio::io_service> io_service_;
bool always_verify_peer_;
int timeout_;
bool remove_chunk_markers_;
};

template <class Tag>
Expand Down
10 changes: 6 additions & 4 deletions boost/network/protocol/http/client/pimpl.hpp
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Expand Up @@ -74,10 +74,12 @@ struct basic_client_impl
optional<string_type> const& private_key_file,
optional<string_type> const& ciphers,
optional<string_type> const& sni_hostname, long ssl_options,
std::shared_ptr<boost::asio::io_service> service, int timeout)
: base_type(cache_resolved, follow_redirect, always_verify_peer, timeout,
service, certificate_filename, verify_path, certificate_file,
private_key_file, ciphers, sni_hostname, ssl_options) {}
std::shared_ptr<boost::asio::io_service> service, int timeout,
bool remove_chunk_markers)
: base_type(cache_resolved, follow_redirect, always_verify_peer, timeout,
remove_chunk_markers, service, certificate_filename, verify_path,
certificate_file, private_key_file, ciphers, sni_hostname,
ssl_options) {}

~basic_client_impl() = default;
};
Expand Down
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