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#include <fstream>
#include <drogon/HttpController.h>
#include <drogon/HttpRequest.h>
#include <drogon/RequestStream.h>
using namespace drogon;
class RequestStreamTestCtrl : public HttpController<RequestStreamTestCtrl>
{
public:
METHOD_LIST_BEGIN
ADD_METHOD_TO(RequestStreamTestCtrl::stream_status, "/stream_status", Get);
ADD_METHOD_TO(RequestStreamTestCtrl::stream_chunk, "/stream_chunk", Post);
ADD_METHOD_TO(RequestStreamTestCtrl::stream_upload_echo,
"/stream_upload_echo",
Post);
METHOD_LIST_END
void stream_status(
const HttpRequestPtr &,
std::function<void(const HttpResponsePtr &)> &&callback) const
{
auto resp = HttpResponse::newHttpResponse();
if (app().isRequestStreamEnabled())
{
resp->setBody("enabled");
}
else
{
resp->setBody("not enabled");
}
callback(resp);
}
void stream_chunk(
const HttpRequestPtr &,
RequestStreamPtr &&stream,
std::function<void(const HttpResponsePtr &)> &&callback) const
{
if (!stream)
{
LOG_INFO << "stream mode is not enabled";
auto resp = HttpResponse::newHttpResponse();
resp->setStatusCode(k400BadRequest);
resp->setBody("no stream");
callback(resp);
return;
}
auto respBody = std::make_shared<std::string>();
auto reader = RequestStreamReader::newReader(
[respBody](const char *data, size_t length) {
respBody->append(data, length);
},
[respBody, callback = std::move(callback)](std::exception_ptr ex) {
auto resp = HttpResponse::newHttpResponse();
if (ex)
{
try
{
std::rethrow_exception(std::move(ex));
}
catch (const std::exception &e)
{
LOG_ERROR << "stream error: " << e.what();
}
resp->setStatusCode(k400BadRequest);
resp->setBody("stream error");
callback(resp);
}
else
{
resp->setBody(*respBody);
callback(resp);
}
});
stream->setStreamReader(std::move(reader));
}
void stream_upload_echo(
const HttpRequestPtr &req,
RequestStreamPtr &&stream,
std::function<void(const HttpResponsePtr &)> &&callback) const
{
assert(drogon::app().isRequestStreamEnabled() || !stream);
if (!stream)
{
LOG_INFO << "stream mode is not enabled";
auto resp = HttpResponse::newHttpResponse();
resp->setStatusCode(k400BadRequest);
resp->setBody("no stream");
callback(resp);
return;
}
if (req->contentType() != CT_MULTIPART_FORM_DATA)
{
auto resp = HttpResponse::newHttpResponse();
resp->setStatusCode(k400BadRequest);
resp->setBody("should upload multipart");
callback(resp);
return;
}
struct Context
{
std::string firstFileContent;
size_t currentFileIndex_{0};
};
auto ctx = std::make_shared<Context>();
auto reader = RequestStreamReader::newMultipartReader(
req,
[ctx](MultipartHeader &&header) { ctx->currentFileIndex_++; },
[ctx](const char *data, size_t length) {
if (ctx->currentFileIndex_ == 1)
{
ctx->firstFileContent.append(data, length);
}
},
[ctx, callback = std::move(callback)](std::exception_ptr ex) {
auto resp = HttpResponse::newHttpResponse();
if (ex)
{
try
{
std::rethrow_exception(std::move(ex));
}
catch (const StreamError &e)
{
LOG_ERROR << "stream error: " << e.what();
}
catch (const std::exception &e)
{
LOG_ERROR << "multipart error: " << e.what();
}
resp->setStatusCode(k400BadRequest);
resp->setBody("error\n");
callback(resp);
}
else
{
resp->setBody(ctx->firstFileContent);
callback(resp);
}
});
stream->setStreamReader(std::move(reader));
}
};
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