/*
* Thread main loop.
*/
void *thread_main(void *arg)
{
while (1) {
int want_get = (random() % 100) < probability_get;
int fd = unused_fd();
int usec;
if (want_get)
send_get(fd);
else
send_delete(fd);
release_fd(fd);
pthread_mutex_lock(&stats_mutex);
iteration_count++;
pthread_mutex_unlock(&stats_mutex);
}
}
int Cache(int csd, char *url){
FILE *infile;
int MAX_LENGTH;
infile = fopen("website", "ab+");
if (infile == NULL){
perror("Could not read cache!\n");
return 0;
/* char new[strlen(url)+1];*/
/* memset(&new, 0, sizeof(new));*/
/* memcpy(&new, url, strlen(url));*/
/* new[strlen(url)]='\n';*/
/* */
/* if (fputs(new, infile) == -1) {*/
/* return 0;*/
/* }*/
}
else {
fseek(infile, 0, SEEK_END);
MAX_LENGTH = ftell(infile);
rewind(infile);
char buf[MAX_LENGTH];
if (fread(buf, 1, MAX_LENGTH, infile) != MAX_LENGTH){
perror("Could not copy data from cache!\n");
fclose(infile);
}
else {
fclose(infile);
if (strstr(buf, url) != NULL) {//read from cache
if (ReadCache(csd, url) != 1) {
perror("send cache error!\n");
return 0;
}
} else {// connect to web server
char host[256];
char page[256];
char *get;
char *tran = url;
int k = 0;
while (url[k] != '_'){
k++;
if (url[k] == '\0')
break;
}
memset(host, 0, strlen(host));
memcpy(host, tran, strlen(tran));
host[k]='\0';
memset(page, 0, strlen(page));
page[0]='/';
memcpy(page+1, tran+k+1, strlen(tran)-k);
page[strlen(tran)-k] = '\0';
get = build_get(host, page);
fprintf(stderr, "Query is:\n<<START>>\n%s<<END>>\n", get);
if (send_get(csd, get) != 1) {
perror("Send ERROR!\n");
exit(EXIT_FAILURE);
}
}
}
}
if (ModifyCache(url) != 1) {
perror("ModifyCache() error!\n");
return 0;
}
return 1;
}
HTTPCode ChronosInternalConnection::resynchronise_with_single_node(
const std::string server_to_sync,
std::vector<std::string> cluster_nodes,
std::string localhost)
{
TRC_DEBUG("Querying %s for timers", server_to_sync.c_str());
// Get the cluster view ID from the global configuration
std::string cluster_view_id;
__globals->get_cluster_view_id(cluster_view_id);
std::string response;
HTTPCode rc;
// Loop sending GETs to the server while the response is a 206
do
{
std::map<TimerID, int> delete_map;
rc = send_get(server_to_sync,
localhost,
PARAM_SYNC_MODE_VALUE_SCALE,
cluster_view_id,
MAX_TIMERS_IN_RESPONSE,
response);
if ((rc == HTTP_PARTIAL_CONTENT) ||
(rc == HTTP_OK))
{
// Parse the GET response
rapidjson::Document doc;
doc.Parse<0>(response.c_str());
if (doc.HasParseError())
{
// We've failed to parse the document as JSON. This suggests that
// there's something seriously wrong with the node we're trying
// to query so don't retry
TRC_WARNING("Failed to parse document as JSON");
rc = HTTP_BAD_REQUEST;
break;
}
try
{
JSON_ASSERT_CONTAINS(doc, JSON_TIMERS);
JSON_ASSERT_ARRAY(doc[JSON_TIMERS]);
const rapidjson::Value& ids_arr = doc[JSON_TIMERS];
int total_timers = ids_arr.Size();
int count_invalid_timers = 0;
for (rapidjson::Value::ConstValueIterator ids_it = ids_arr.Begin();
ids_it != ids_arr.End();
++ids_it)
{
try
{
const rapidjson::Value& id_arr = *ids_it;
JSON_ASSERT_OBJECT(id_arr);
// Get the timer ID
TimerID timer_id;
JSON_GET_INT_MEMBER(id_arr, JSON_TIMER_ID, timer_id);
// Get the old replicas
std::vector<std::string> old_replicas;
JSON_ASSERT_CONTAINS(id_arr, JSON_OLD_REPLICAS);
JSON_ASSERT_ARRAY(id_arr[JSON_OLD_REPLICAS]);
const rapidjson::Value& old_repl_arr = id_arr[JSON_OLD_REPLICAS];
for (rapidjson::Value::ConstValueIterator repl_it = old_repl_arr.Begin();
repl_it != old_repl_arr.End();
++repl_it)
{
JSON_ASSERT_STRING(*repl_it);
old_replicas.push_back(repl_it->GetString());
}
// Get the timer.
JSON_ASSERT_CONTAINS(id_arr, JSON_TIMER);
JSON_ASSERT_OBJECT(id_arr[JSON_TIMER]);
const rapidjson::Value& timer_obj = id_arr[JSON_TIMER];
bool store_timer = false;
std::string error_str;
bool replicated_timer;
Timer* timer = Timer::from_json_obj(timer_id,
0,
error_str,
replicated_timer,
(rapidjson::Value&)timer_obj);
if (!timer)
{
count_invalid_timers++;
TRC_INFO("Unable to create timer - error: %s", error_str.c_str());
continue;
}
else if (!replicated_timer)
{
count_invalid_timers++;
TRC_INFO("Unreplicated timer in response - ignoring");
delete timer; timer = NULL;
continue;
}
// Decide what we're going to do with this timer.
int old_level = 0;
bool in_old_replica_list = get_replica_level(old_level,
localhost,
old_replicas);
int new_level = 0;
bool in_new_replica_list = get_replica_level(new_level,
localhost,
timer->replicas);
// Add the timer to the delete map we're building up
delete_map.insert(std::pair<TimerID, int>(timer_id, new_level));
if (in_new_replica_list)
{
// Add the timer to my store if I can.
if (in_old_replica_list)
{
if (old_level >= new_level)
{
// Add/update timer
// LCOV_EXCL_START - Adding timer paths are tested elsewhere
store_timer = true;
// LCOV_EXCL_STOP
}
}
else
{
// Add/update timer
store_timer = true;
}
// Now loop through the new replicas.
int index = 0;
for (std::vector<std::string>::iterator it = timer->replicas.begin();
it != timer->replicas.end();
++it, ++index)
{
if (index <= new_level)
{
// Do nothing. We've covered adding the timer to the store above
}
else
{
// We can potentially replicate the timer to one of these nodes.
// Check whether the new replica was involved previously
int old_rep_level = 0;
bool is_new_rep_in_old_rep = get_replica_level(old_rep_level,
*it,
old_replicas);
if (is_new_rep_in_old_rep)
{
if (old_rep_level >= new_level)
{
_replicator->replicate_timer_to_node(timer, *it);
}
}
else
{
_replicator->replicate_timer_to_node(timer, *it);
}
}
}
// Now loop through the old replicas. We can send a tombstone
// replication to any node that used to be a replica and was
// higher in the replica list than the new replica.
index = 0;
for (std::vector<std::string>::iterator it = old_replicas.begin();
it != old_replicas.end();
++it, ++index)
{
if (index >= new_level)
{
// We can potentially tombstone the timer to one of these nodes.
bool old_rep_in_new_rep = get_replica_presence(*it,
timer->replicas);
if (!old_rep_in_new_rep)
{
Timer* timer_copy = new Timer(*timer);
timer_copy->become_tombstone();
_replicator->replicate_timer_to_node(timer_copy, *it);
delete timer_copy; timer_copy = NULL;
}
}
}
}
// Add the timer to the store if we can. This is done
// last so we don't invalidate the pointer to the timer.
if (store_timer)
{
_handler->add_timer(timer);
}
else
{
delete timer; timer = NULL;
}
// Finally, note that we processed the timer
_timers_processed_stat->increment();
}
catch (JsonFormatError err)
{
// A single entry is badly formatted. This is unexpected but we'll try
// to keep going and process the rest of the timers.
count_invalid_timers++;
_invalid_timers_processed_stat->increment();
TRC_INFO("JSON entry was invalid (hit error at %s:%d)",
err._file, err._line);
}
}
// Check if we were able to successfully process any timers - if not
// then bail out as there's something wrong with the node we're
// querying
if ((total_timers != 0) &&
(count_invalid_timers == total_timers))
{
TRC_WARNING("Unable to process any timer entries in GET response");
rc = HTTP_BAD_REQUEST;
}
}
catch (JsonFormatError err)
{
// We've failed to find the Timers array. This suggests that
// there's something seriously wrong with the node we're trying
// to query so don't retry
TRC_WARNING("JSON body didn't contain the Timers array");
rc = HTTP_BAD_REQUEST;
}
// Send a DELETE to all the nodes to update their timer references
if (delete_map.size() > 0)
{
std::string delete_body = create_delete_body(delete_map);
for (std::vector<std::string>::iterator it = cluster_nodes.begin();
it != cluster_nodes.end();
++it)
{
HTTPCode delete_rc = send_delete(*it, delete_body);
if (delete_rc != HTTP_ACCEPTED)
{
// We've received an error response to the DELETE request. There's
// not much more we can do here (a timeout will have already
// been retried). A failed DELETE won't prevent the scaling operation
// from finishing, it just means that we'll tell other nodes
// about timers inefficiently.
TRC_INFO("Error response (%d) to DELETE request to %s",
delete_rc,
(*it).c_str());
}
}
}
}
else
{
// We've received an error response to the GET request. A timeout
// will already have been retried by the underlying HTTPConnection,
// so don't retry again
TRC_WARNING("Error response (%d) to GET request to %s",
rc,
server_to_sync.c_str());
}
}
while (rc == HTTP_PARTIAL_CONTENT);
return rc;
}
