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web: only issue a single call to lws_write() per LWS_*_WRITABLE callback

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This commit is contained in:
Steffen Vogel 2019-01-14 10:08:04 +01:00
parent daf72cd0bd
commit 70faba9fd9
3 changed files with 43 additions and 30 deletions
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3
include/villas/api/sessions/http.hpp
View file

@ -39,6 +39,9 @@ namespace sessions {
class Http : public Wsi {
protected:
bool headersSent;
public:
Http(Api *s, lws *w);
virtual ~Http() { };

66
lib/api/sessions/http.cpp
View file

@ -35,7 +35,8 @@ using namespace villas::node;
using namespace villas::node::api::sessions;
Http::Http(Api *a, lws *w) :
Wsi(a, w)
Wsi(a, w),
headersSent(false)
{
int hdrlen, options = -1, version;
char *uri;
@ -86,37 +87,47 @@ int Http::complete()
int Http::write()
{
int ret;
json_t *resp;
resp = response.queue.pop();
if (!headersSent) {
std::stringstream headers;
response.buffer.clear();
response.buffer.encode(resp);
json_t *resp = response.queue.pop();
json_decref(resp);
response.buffer.clear();
response.buffer.encode(resp);
std::stringstream headers;
json_decref(resp);
headers << "HTTP/1.1 200 OK\r\n"
<< "Content-type: application/json\r\n"
<< "User-agent: " USER_AGENT "\r\n"
<< "Connection: close\r\n"
<< "Content-Length: " << response.buffer.size() << "\r\n"
<< "Access-Control-Allow-Origin: *\r\n"
<< "Access-Control-Allow-Methods: GET, POST, OPTIONS\r\n"
<< "Access-Control-Allow-Headers: Content-Type\r\n"
<< "Access-Control-Max-Age: 86400\r\n"
<< "\r\n";
headers << "HTTP/1.1 200 OK\r\n"
<< "Content-type: application/json\r\n"
<< "User-agent: " USER_AGENT "\r\n"
<< "Connection: close\r\n"
<< "Content-Length: " << response.buffer.size() << "\r\n"
<< "Access-Control-Allow-Origin: *\r\n"
<< "Access-Control-Allow-Methods: GET, POST, OPTIONS\r\n"
<< "Access-Control-Allow-Headers: Content-Type\r\n"
<< "Access-Control-Max-Age: 86400\r\n"
<< "\r\n";
ret = lws_write(wsi, (unsigned char *) headers.str().data(), headers.str().size(), LWS_WRITE_HTTP_HEADERS);
if (ret < 0)
return -1;
ret = lws_write(wsi, (unsigned char *) headers.str().data(), headers.str().size(), LWS_WRITE_HTTP_HEADERS);
if (ret < 0)
return -1;
ret = lws_write(wsi, (unsigned char *) response.buffer.data(), response.buffer.size(), LWS_WRITE_HTTP);
if (ret < 0)
return -1;
/* No wait, until we can send the body */
headersSent = true;
lws_callback_on_writable(wsi);
return 1;
return 0;
}
else {
ret = lws_write(wsi, (unsigned char *) response.buffer.data(), response.buffer.size(), LWS_WRITE_HTTP_FINAL);
if (ret < 0)
return -1;
headersSent = false;
return 1;
}
}
std::string Http::getName()
@ -175,9 +186,10 @@ int api_http_protocol_cb(struct lws *wsi, enum lws_callback_reasons reason, void
case LWS_CALLBACK_HTTP_WRITEABLE:
ret = s->write();
if (lws_http_transaction_completed(wsi))
return -1;
if (ret) {
if (lws_http_transaction_completed(wsi))
return -1;
}
return 0;

4
lib/api/sessions/websocket.cpp
View file

@ -85,9 +85,7 @@ int WebSocket::write()
json_decref(resp);
lws_write(wsi, (unsigned char *) response.buffer.data() + LWS_PRE, response.buffer.size() - LWS_PRE, LWS_WRITE_TEXT);
return 0;
return lws_write(wsi, (unsigned char *) response.buffer.data() + LWS_PRE, response.buffer.size() - LWS_PRE, LWS_WRITE_TEXT);
}
std::string WebSocket::getName()