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download: async API

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moneromooo-monero 2017-02-26 12:00:45 +00:00
parent 9bf017edf2
commit 63f0e074eb
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GPG key ID: 686F07454D6CEFC3
2 changed files with 153 additions and 26 deletions
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169
src/common/download.cpp
View file

@ -40,27 +40,70 @@
namespace tools
{
static bool download_thread(const std::string &path, const std::string &url)
struct download_thread_control
{
const std::string path;
const std::string uri;
std::function<void(const std::string&, const std::string&, bool)> result_cb;
std::function<bool(const std::string&, const std::string&, size_t, ssize_t)> progress_cb;
bool stop;
bool stopped;
bool success;
boost::thread thread;
boost::mutex mutex;
download_thread_control(const std::string &path, const std::string &uri, std::function<void(const std::string&, const std::string&, bool)> result_cb, std::function<bool(const std::string&, const std::string&, size_t, ssize_t)> progress_cb):
path(path), uri(uri), result_cb(result_cb), progress_cb(progress_cb), stop(false), stopped(false), success(false) {}
~download_thread_control() { if (thread.joinable()) thread.detach(); }
};
static void download_thread(download_async_handle control)
{
struct stopped_setter
{
stopped_setter(const download_async_handle &control): control(control) {}
~stopped_setter() { control->stopped = true; }
download_async_handle control;
} stopped_setter(control);
try
{
MINFO("Downloading " << url << " to " << path);
boost::unique_lock<boost::mutex> lock(control->mutex);
MINFO("Downloading " << control->uri << " to " << control->path);
std::ofstream f;
f.open(path, std::ios_base::binary | std::ios_base::out | std::ios_base::trunc);
f.open(control->path, std::ios_base::binary | std::ios_base::out | std::ios_base::trunc);
if (!f.good()) {
MERROR("Failed to open file " << path);
return false;
MERROR("Failed to open file " << control->path);
control->result_cb(control->path, control->uri, control->success);
return;
}
class download_client: public epee::net_utils::http::http_simple_client
{
public:
download_client(std::ofstream &f): f(f) {}
download_client(download_async_handle control, std::ofstream &f):
control(control), f(f), content_length(-1), total(0) {}
virtual ~download_client() { f.close(); }
virtual bool on_header(const epee::net_utils::http::http_response_info &headers)
{
ssize_t length;
if (epee::string_tools::get_xtype_from_string(length, headers.m_header_info.m_content_length) && length >= 0)
{
MINFO("Content-Length: " << length);
content_length = length;
}
return true;
}
virtual bool handle_target_data(std::string &piece_of_transfer)
{
try
{
boost::lock_guard<boost::mutex> lock(control->mutex);
if (control->stop)
return false;
f << piece_of_transfer;
total += piece_of_transfer.size();
if (control->progress_cb && !control->progress_cb(control->path, control->uri, total, content_length))
return false;
return f.good();
}
catch (const std::exception &e)
@ -70,69 +113,145 @@ namespace tools
}
}
private:
download_async_handle control;
std::ofstream &f;
} client(f);
ssize_t content_length;
size_t total;
} client(control, f);
epee::net_utils::http::url_content u_c;
if (!epee::net_utils::parse_url(url, u_c))
if (!epee::net_utils::parse_url(control->uri, u_c))
{
MWARNING("Failed to parse URL " << url);
return false;
MERROR("Failed to parse URL " << control->uri);
control->result_cb(control->path, control->uri, control->success);
return;
}
if (u_c.host.empty())
{
MWARNING("Failed to determine address from URL " << url);
return false;
MERROR("Failed to determine address from URL " << control->uri);
control->result_cb(control->path, control->uri, control->success);
return;
}
lock.unlock();
uint16_t port = u_c.port ? u_c.port : 80;
MDEBUG("Connecting to " << u_c.host << ":" << port);
client.set_server(u_c.host, std::to_string(port), boost::none);
if (!client.connect(std::chrono::seconds(30)))
{
MERROR("Failed to connect to " << url);
return false;
boost::lock_guard<boost::mutex> lock(control->mutex);
MERROR("Failed to connect to " << control->uri);
control->result_cb(control->path, control->uri, control->success);
return;
}
MDEBUG("GETting " << u_c.uri);
const epee::net_utils::http::http_response_info *info = NULL;
if (!client.invoke_get(u_c.uri, std::chrono::seconds(30), "", &info))
{
MERROR("Failed to connect to " << url);
boost::lock_guard<boost::mutex> lock(control->mutex);
MERROR("Failed to connect to " << control->uri);
client.disconnect();
return false;
control->result_cb(control->path, control->uri, control->success);
return;
}
if (control->stop)
{
boost::lock_guard<boost::mutex> lock(control->mutex);
MDEBUG("Download cancelled");
client.disconnect();
control->result_cb(control->path, control->uri, control->success);
return;
}
if (!info)
{
MERROR("Failed invoking GET command to " << url << ", no status info returned");
boost::lock_guard<boost::mutex> lock(control->mutex);
MERROR("Failed invoking GET command to " << control->uri << ", no status info returned");
client.disconnect();
return false;
control->result_cb(control->path, control->uri, control->success);
return;
}
MDEBUG("response code: " << info->m_response_code);
MDEBUG("response length: " << info->m_header_info.m_content_length);
MDEBUG("response comment: " << info->m_response_comment);
MDEBUG("response body: " << info->m_body);
for (const auto &f: info->m_additional_fields)
MDEBUG("additional field: " << f.first << ": " << f.second);
if (info->m_response_code != 200)
{
boost::lock_guard<boost::mutex> lock(control->mutex);
MERROR("Status code " << info->m_response_code);
client.disconnect();
return false;
control->result_cb(control->path, control->uri, control->success);
return;
}
client.disconnect();
f.close();
MDEBUG("Download complete");
return true;
lock.lock();
control->success = true;
control->result_cb(control->path, control->uri, control->success);
return;
}
catch (const std::exception &e)
{
MERROR("Exception in download thread: " << e.what());
return false;
// fall through and call result_cb not from the catch block to avoid another exception
}
boost::lock_guard<boost::mutex> lock(control->mutex);
control->result_cb(control->path, control->uri, control->success);
}
bool download(const std::string &path, const std::string &url)
bool download(const std::string &path, const std::string &url, std::function<bool(const std::string&, const std::string&, size_t, ssize_t)> cb)
{
bool success;
std::unique_ptr<boost::thread> thread(new boost::thread([&](){ success = download_thread(path, url); }));
thread->join();
bool success = false;
download_async_handle handle = download_async(path, url, [&success](const std::string&, const std::string&, bool result) {success = result;}, cb);
download_wait(handle);
return success;
}
download_async_handle download_async(const std::string &path, const std::string &url, std::function<void(const std::string&, const std::string&, bool)> result, std::function<bool(const std::string&, const std::string&, size_t, ssize_t)> progress)
{
download_async_handle control = std::make_shared<download_thread_control>(path, url, result, progress);
control->thread = boost::thread([control](){ download_thread(control); });
return control;
}
bool download_finished(const download_async_handle &control)
{
CHECK_AND_ASSERT_MES(control != 0, false, "NULL async download handle");
boost::lock_guard<boost::mutex> lock(control->mutex);
return control->stopped;
}
bool download_error(const download_async_handle &control)
{
CHECK_AND_ASSERT_MES(control != 0, false, "NULL async download handle");
boost::lock_guard<boost::mutex> lock(control->mutex);
return !control->success;
}
bool download_wait(const download_async_handle &control)
{
CHECK_AND_ASSERT_MES(control != 0, false, "NULL async download handle");
{
boost::lock_guard<boost::mutex> lock(control->mutex);
if (control->stopped)
return true;
}
control->thread.join();
return true;
}
bool download_cancel(const download_async_handle &control)
{
CHECK_AND_ASSERT_MES(control != 0, false, "NULL async download handle");
{
boost::lock_guard<boost::mutex> lock(control->mutex);
if (control->stopped)
return true;
control->stop = true;
}
control->thread.join();
return true;
}
}

10
src/common/download.h
View file

@ -32,5 +32,13 @@
namespace tools
{
bool download(const std::string &path, const std::string &url);
struct download_thread_control;
typedef std::shared_ptr<download_thread_control> download_async_handle;
bool download(const std::string &path, const std::string &url, std::function<bool(const std::string&, const std::string&, size_t, ssize_t)> progress = NULL);
download_async_handle download_async(const std::string &path, const std::string &url, std::function<void(const std::string&, const std::string&, bool)> result, std::function<bool(const std::string&, const std::string&, size_t, ssize_t)> progress = NULL);
bool download_error(const download_async_handle &h);
bool download_finished(const download_async_handle &h);
bool download_wait(const download_async_handle &h);
bool download_cancel(const download_async_handle &h);
}