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Fixes #635 - bug in async server's connection read#637

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Fixes#635 - bug in async server's connection read
This changes the example file server to use the read handler forPOST/PUT requests. This currently assumes that there's a content-lengthheader (not much error handling is happening here, but it's meant as aproof of concept anyway).Using this code path in an example should be good enough for the momentuntil we have better tests and a better API for this functionality.
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@deanberris
deanberris committedApr 19, 2016
commit79aaa62dc8ae1f71cbb7ba8fac9c77b1f2a03de3
13 changes: 7 additions & 6 deletionsboost/network/protocol/http/server/async_connection.hpp
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Original file line numberDiff line numberDiff line change
Expand Up@@ -378,7 +378,7 @@ struct async_connection
boost::throw_exception(std::system_error(*error_encountered));
if (new_start != read_buffer_.begin()) {
input_range input =
boost::make_iterator_range(new_start,read_buffer_.end());
boost::make_iterator_range(new_start,data_end);
buffer_type::iterator start_tmp = new_start;
new_start = read_buffer_.begin();
auto self = this->shared_from_this();
Expand All@@ -389,11 +389,12 @@ struct async_connection
}

auto self = this->shared_from_this();

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You do not needself here anymore, since it is not used in the lambda (can also be removed from the capture section of the lambda).

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Actually, this "self" variable makes sure that the object is alive -- it ensures that there's a shared reference in the callback that depends on the state of the connection. It's a trick that's tied to how asynchronous programming is really hard to debug. 😀

socket().async_read_some(asio::buffer(read_buffer_),
strand.wrap([this, self, callback](
std::error_code ec, size_t bytes_transferred) {
callback(ec, bytes_transferred);
}));
socket().async_read_some(
asio::buffer(read_buffer_),
strand.wrap([this, self, callback](std::error_code ec,
size_t bytes_transferred) {
this->wrap_read_handler(callback, ec, bytes_transferred);
}));
}

/// Returns a reference to the underlying socket.
Expand Down
79 changes: 69 additions & 10 deletionslibs/network/example/http/fileserver.cpp
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Original file line numberDiff line numberDiff line change
Expand Up@@ -21,7 +21,6 @@ struct file_server;
typedef http::server<file_server> server;

struct file_cache {

typedef std::map<std::string, std::pair<void *, std::size_t> > region_map;
typedef std::map<std::string, std::vector<server::response_header> > meta_map;

Expand DownExpand Up@@ -66,7 +65,8 @@ struct file_cache {

regions.insert(std::make_pair(real_filename, std::make_pair(region, size)));
static server::response_header common_headers[] = {
{"Connection", "close"}, {"Content-Type", "x-application/octet-stream"},
{"Connection", "close"},
{"Content-Type", "x-application/octet-stream"},
{"Content-Length", "0"}};
std::vector<server::response_header> headers(common_headers,
common_headers + 3);
Expand All@@ -91,8 +91,7 @@ struct file_cache {
static std::vector<server::response_header> empty_vector;
auto headers = file_headers.find(doc_root_ + path);
if (headers != file_headers.end()) {
auto begin = headers->second.begin(),
end = headers->second.end();
auto begin = headers->second.begin(), end = headers->second.end();
return boost::make_iterator_range(begin, end);
} else
return boost::make_iterator_range(empty_vector);
Expand DownExpand Up@@ -138,22 +137,75 @@ struct connection_handler : std::enable_shared_from_this<connection_handler> {
asio::const_buffers_1(
static_cast<char const *>(mmaped_region.first) + offset,
rightmost_bound - offset),
[=](std::error_code const &ec) {
[=](std::error_code const &ec) {
self->handle_chunk(mmaped_region, rightmost_bound, connection, ec);
});
}

void handle_chunk(std::pair<void *, std::size_t> mmaped_region, off_t offset,
server::connection_ptr connection,
std::error_code const &ec) {
assert(offset>=0);
assert(offset >=0);
if (!ec && static_cast<std::size_t>(offset) < mmaped_region.second)
send_file(mmaped_region, offset, connection);
}

file_cache &file_cache_;
};

struct input_consumer : public std::enable_shared_from_this<input_consumer> {
// Maximum size for incoming request bodies.
static constexpr std::size_t MAX_INPUT_BODY_SIZE = 2 << 16;

explicit input_consumer(std::shared_ptr<connection_handler> h,
server::request r)
: request_(std::move(r)), handler_(std::move(h)), content_length_{0} {
for (const auto &header : request_.headers) {
if (boost::iequals(header.name, "content-length")) {
content_length_ = std::stoul(header.value);
std::cerr << "Content length: " << content_length_ << '\n';
break;
}
}
}

void operator()(server::connection::input_range input, std::error_code ec,
std::size_t bytes_transferred,
server::connection_ptr connection) {
std::cerr << "Callback: " << bytes_transferred << "; ec = " << ec << '\n';
if (ec == asio::error::eof) return;
if (!ec) {
if (empty(input))
return (*handler_)(request_.destination, connection, true);
request_.body.insert(request_.body.end(), boost::begin(input),
boost::end(input));
if (request_.body.size() > MAX_INPUT_BODY_SIZE) {
connection->set_status(server::connection::bad_request);
static server::response_header error_headers[] = {
{"Connection", "close"}};
connection->set_headers(
boost::make_iterator_range(error_headers, error_headers + 1));
connection->write("Body too large.");
return;
}
std::cerr << "Body: " << request_.body << '\n';
if (request_.body.size() == content_length_)
return (*handler_)(request_.destination, connection, true);
std::cerr << "Scheduling another read...\n";
auto self = this->shared_from_this();
connection->read([self](server::connection::input_range input,
std::error_code ec, std::size_t bytes_transferred,
server::connection_ptr connection) {
(*self)(input, ec, bytes_transferred, connection);
});
}
}

server::request request_;
std::shared_ptr<connection_handler> handler_;
size_t content_length_;
};

struct file_server {
explicit file_server(file_cache &cache) : cache_(cache) {}

Expand All@@ -165,6 +217,14 @@ struct file_server {
} else if (request.method == "GET") {
std::shared_ptr<connection_handler> h(new connection_handler(cache_));
(*h)(request.destination, connection, true);
} else if (request.method == "PUT" || request.method == "POST") {
auto h = std::make_shared<connection_handler>(cache_);
auto c = std::make_shared<input_consumer>(h, request);
connection->read([c](server::connection::input_range input,
std::error_code ec, std::size_t bytes_transferred,
server::connection_ptr connection) {
(*c)(input, ec, bytes_transferred, connection);
});
} else {
static server::response_header error_headers[] = {
{"Connection", "close"}};
Expand All@@ -184,11 +244,10 @@ int main(int, char *[]) {
file_server handler(cache);
server::options options(handler);
server instance(options.thread_pool(std::make_shared<utils::thread_pool>(4))
.address("0.0.0.0")
.port("8000"));
.address("0.0.0.0")
.port("8000"));
instance.run();
}
catch (std::exception &e) {
} catch (std::exception &e) {
std::cerr << e.what() << std::endl;
}
}
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