/*
* run the request
*/
static HTTPResponse *_runRequest(WOAppReq *app, WOAppHandle woappHandle, WOInstanceHandle instHandle, HTTPRequest *req) {
WOConnection *c;
HTTPResponse *resp = NULL;
int send_status, keepConnection, retryRequest = 0;
const char *idString = NULL;
WOLog(WO_INFO,"Trying to contact %s:%s on %s(%d)", app->name,app->instance,app->host,app->port);
/* Tag the request with a unique identifier (if it hasn't been already) */
/* (It might already have been tagged if we are retrying the request due to refusing new sessions, for example) */
idString = req_HeaderForKey(req, REQUEST_ID_HEADER);
if (idString == NULL)
{
String *requestID = tr_uniqueID();
if (requestID)
{
req_addHeader(req, REQUEST_ID_HEADER, requestID->text, STR_COPYVALUE);
idString = req_HeaderForKey(req, REQUEST_ID_HEADER);
str_free(requestID);
}
}
do {
c = tr_open(instHandle); /* connect */
if (c == NULL) {
WOLog(WO_INFO,"%s:%s NOT LISTENING on %s(%d)", app->name,app->instance,app->host,app->port);
app->error = err_connect;
return NULL;
}
/*
* app found and is listening on port
*/
if (app->scheduler->beginTransaction)
app->scheduler->beginTransaction(app, instHandle);
/* Make sure that we're the only connection header, and we're explicit about the setting */
req_removeHeader(req,CONNECTION);
if (c->isPooled) {
req_addHeader(req,CONNECTION,HTTP_KEEP_ALIVE,0);
} else {
req_addHeader(req,CONNECTION,HTTP_CLOSE,0);
}
WOLog(WO_INFO,"%s:%s on %s(%d) connected [pooled: %s]", app->name, app->instance, app->host, app->port, c->isPooled ? "Yes" : "No");
/*
* send the request....
*/
send_status = req_sendRequest(req, c->fd);
if (send_status != 0) {
if ((send_status == TR_RESET) && (retryRequest == 0) && !req->haveReadStreamedData) {
/* If we get here the connection was reset. This means the instance has either quit or crashed. */
/* Bump the generation number so all pooled connections to this instance will be invalidated. */
/* Then retry the request with a new connection. If the instance is not running the retry will */
/* fail with a different error and the instance will be marked dead. */
_WOInstance *inst = ac_lockInstance(instHandle);
/* note: if we get here, keepConnection == 0 --> this connection will be closed */
if (inst)
{
ac_cycleInstance(inst, c->generation);
ac_unlockInstance(instHandle);
}
retryRequest++;
WOLog(WO_INFO, "retrying request due to connection reset");
/* Must close connection before continuing */
tr_close(c, instHandle, 0);
continue;
} else {
WOLog(WO_ERR,"Failed to send request");
tr_close(c, instHandle, 0); /* close app connection */
if (send_status == -1)
app->error = err_read;
else
app->error = err_send;
return NULL;
}
}
/* Note that we have a request queued */
WOLog(WO_INFO,"Request %s sent, awaiting response", req->request_str);
/* While the app is processing the request, take the opportunity to check/update the config. */
ac_readConfiguration();
/*
* now wait for the response...
*/
resp = resp_getResponseHeaders(c, instHandle);
/* go ahead and read the first chunk of response data */
if (resp && req->method != HTTP_HEAD_METHOD)
{
if (resp_getResponseContent(resp, 1) == -1)
{
resp_free(resp);
resp = NULL;
}
}
/* Validate the ID */
if (idString && resp)
{
const char *respID = st_valueFor(resp->headers, REQUEST_ID_HEADER);
if (respID != NULL)
{
if (strcmp(respID, idString) != 0)
{
WOLog(WO_ERR, "Got response with wrong ID! Dumping response. request ID = %s, response ID = %s", idString, respID);
/* note this will cause the connection to be closed below */
resp_free(resp);
resp = NULL;
} else
st_removeKey(resp->headers, REQUEST_ID_HEADER);
} else
WOLog(WO_WARN, "Got response with no ID.");
}
app->response = resp;
/*
* check if this connection can be kept open
*/
keepConnection = 0;
#ifndef CGI /* doesn't make sense to keep the connection for CGI */
if (resp && resp->headers)
{
const char *keepAlive;
keepAlive = st_valueFor(resp->headers, CONNECTION);
if (keepAlive)
{
/* if the keep alive header is set, honor the value */
if (strcasecmp(keepAlive, HTTP_KEEP_ALIVE) == 0)
keepConnection = 1;
} else {
/* no keep alive header - keep alive by default for HTTP/1.1 only */
if (resp->flags & RESP_HTTP11)
keepConnection = 1;
}
}
#endif
if (resp != NULL) {
if (app->scheduler->finalizeTransaction)
if (app->scheduler->finalizeTransaction(app, instHandle))
keepConnection = 0;
st_removeKey(resp->headers, REFUSING_SESSIONS_HEADER);
st_removeKey(resp->headers, LOAD_AVERAGE_HEADER);
st_removeKey(resp->headers, CONNECTION);
WOLog(WO_INFO,"received ->%d %s",resp->status,resp->statusMsg);
retryRequest = 0;
} else {
if (c != NULL && tr_connectionWasReset(c))
{
/* If we get here the connection was reset. This means the instance has either quit or crashed. */
/* Bump the generation number so all pooled connections to this instance will be invalidated. */
/* Then retry the request with a new connection. If the instance is not running the retry will */
/* fail with a different error and the instance will be marked dead. */
/* Note that only one retry due to a connection reset error is allowed. This is to prevent an */
/* infinite loop if the instance dies while processing the request and restarts quickly enough */
/* to process the retry. */
_WOInstance *inst = ac_lockInstance(instHandle);
/* note: if we get here, keepConnection == 0 --> this connection will be closed */
if (inst)
{
ac_cycleInstance(inst, c->generation);
ac_unlockInstance(instHandle);
}
retryRequest++;
if (retryRequest == 1)
WOLog(WO_INFO, "retrying request due to connection reset");
} else
app->error = err_response;
}
if (resp && resp->content_read < resp->content_length)
{
resp->keepConnection = keepConnection;
resp->instHandle = instHandle;
resp->flags |= RESP_CLOSE_CONNECTION;
} else {
tr_close(c, instHandle, keepConnection);
}
} while (retryRequest == 1);
return resp;
}
void req_removeHeader(HTTPRequest *req,const char *key)
{
st_removeKey((strtbl *)req->headers, key);
}