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cass_driver.cpp
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cass_driver.cpp
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#include "storage/cass_driver.h"
#include <cstdlib>
#include <string>
#include "thirdparty/gflags/gflags.h"
DEFINE_string(contact_ip_and_port, "127.0.0.1:9042",
"One of the Cassandra server IPs,"
"seperated by colon from the connect port");
DEFINE_string(log_level, "ERROR",
"Cassandra log level:TRACE, DEBUG, INFO, WARN, ERROR, CRITICAL");
DEFINE_int32(num_threads_io, 0,
"Number of threads that will handle query requests");
DEFINE_int32(queue_size_io, 4096,
"The size of queue that stores pending requests");
DEFINE_int32(pending_req_low, 256,
"The pending requests num below which writes will resume");
DEFINE_int32(pending_req_high, 512,
"The pending requests num beyond which writes will pause");
DEFINE_int32(core_connections, 2,
"Number of connections made to each server in each io thread");
DEFINE_int32(max_connections, 4,
"Max num of connections made to each server in each io thread");
DEFINE_int32(page_size, 100,
"Max count of CQL rows returned each select query");
namespace pushing {
CassDriver::CassDriver() {
InitLogLevelMap();
CreateCluster();
ConnectSession();
PrepareQuery();
}
CassDriver::~CassDriver() {
cass_prepared_free(insert_prepared_);
cass_prepared_free(select_prepared_);
cass_prepared_free(delete_prepared_);
CassFuture* close_future = cass_session_close(session_);
cass_future_wait(close_future);
cass_future_free(close_future);
cass_cluster_free(cluster_);
}
void CassDriver::InitLogLevelMap() {
#define XX(log_level, str) \ // X MACRO
log_level_map_.insert(std::pair<std::string, CassLogLevel>(str, log_level));
CASS_LOG_LEVEL_MAP(XX);
#undef XX
}
void CassDriver::CreateCluster() {
int pos = FLAGS_contact_ip_and_port.find(':');
if (pos == std::string::npos) {
printf("Wrong format in contact_ip_and_port, use ip:port !\n");
return;
}
std::string contact_point = FLAGS_contact_ip_and_port.substr(0, pos);
std::string str_port = FLAGS_contact_ip_and_port.substr(pos + 1);
int port = std::atoi(str_port.c_str());
cluster_ = cass_cluster_new();
cass_cluster_set_contact_points(cluster_, contact_point.c_str());
cass_cluster_set_port(cluster_, port);
cass_cluster_set_log_level(cluster_, ParseLogLevel(FLAGS_log_level));
cass_cluster_set_num_threads_io(cluster_, FLAGS_num_threads_io);
cass_cluster_set_queue_size_io(cluster_, FLAGS_queue_size_io);
cass_cluster_set_pending_requests_low_water_mark(cluster_,
FLAGS_pending_req_low);
cass_cluster_set_pending_requests_high_water_mark(cluster_,
FLAGS_pending_req_high);
cass_cluster_set_core_connections_per_host(cluster_, FLAGS_core_connections);
cass_cluster_set_max_connections_per_host(cluster_, FLAGS_max_connections);
}
CassLogLevel CassDriver::ParseLogLevel(std::string& log_level) {
auto it = log_level_map_.find(log_level);
return it->second;
}
void CassDriver::ConnectSession() {
CassError rc = CASS_OK;
CassFuture* future = cass_cluster_connect_keyspace(cluster_,
"offline_keyspace");
cass_future_wait(future);
rc = cass_future_error_code(future);
if (rc != CASS_OK) {
PrintError(future);
} else {
session_ = cass_future_get_session(future);
}
cass_future_free(future);
}
void CassDriver::PrintError(CassFuture* future) {
CassString message = cass_future_error_message(future);
fprintf(stderr, "Error: %.*s\n", (int)message.length, message.data);
}
void CassDriver::PrepareQuery() {
CassError rc = CASS_OK;
CassString insert_query = cass_string_init("INSERT INTO receiver_table "
"(receiver_id, ts, msg_id, group_id, msg, sender_id) "
"VALUES (?, ?, ?, ?, ?, ?);");
CassFuture* insert_future = cass_session_prepare(session_, insert_query);
cass_future_wait(insert_future);
rc = cass_future_error_code(insert_future);
if (rc != CASS_OK) {
PrintError(insert_future);
} else {
insert_prepared_ = cass_future_get_prepared(insert_future);
}
cass_future_free(insert_future);
rc = CASS_OK;
CassString select_query = cass_string_init("SELECT * FROM receiver_table "
"WHERE receiver_id = ?");
CassFuture* select_future = cass_session_prepare(session_, select_query);
cass_future_wait(select_future);
rc = cass_future_error_code(select_future);
if (rc != CASS_OK) {
PrintError(select_future);
} else {
select_prepared_ = cass_future_get_prepared(select_future);
}
cass_future_free(select_future);
rc = CASS_OK;
CassString delete_query = cass_string_init("DELETE FROM receiver_table "
"WHERE receiver_id = ?");
CassFuture* delete_future = cass_session_prepare(session_, delete_query);
cass_future_wait(delete_future);
rc = cass_future_error_code(delete_future);
if (rc != CASS_OK) {
PrintError(delete_future);
} else {
delete_prepared_ = cass_future_get_prepared(delete_future);
}
cass_future_free(delete_future);
}
void CassDriver::Store(void (*cob)(CassFuture* future, void* data),
const Message& message, void* cb_data) {
CassStatement* statement = cass_prepared_bind(insert_prepared_);
cass_statement_bind_string(statement, 0,
cass_string_init(message.receiver_id.c_str()));
cass_statement_bind_string(statement, 1,
cass_string_init(message.timestamp.c_str()));
cass_statement_bind_string(statement, 2,
cass_string_init(message.msg_id.c_str()));
cass_statement_bind_string(statement, 3,
cass_string_init(message.group_id.c_str()));
cass_statement_bind_string(statement, 4,
cass_string_init(message.msg.c_str()));
cass_statement_bind_string(statement, 5,
cass_string_init(message.sender_id.c_str()));
CassFuture* future = cass_session_execute(session_, statement);
cass_future_set_callback(future, cob, cb_data);
cass_future_free(future);
cass_statement_free(statement);
}
void CassDriver::Retrieve(
std::tr1::function<void(bool success, Wrapper* data)> cob,
const std::string& receiver_id, Wrapper* data_wrapper) {
CassStatement* statement = cass_prepared_bind(select_prepared_);
cass_statement_bind_string(statement, 0,
cass_string_init(receiver_id.c_str()));
cass_statement_set_paging_size(statement, FLAGS_page_size);
CassFuture* future = cass_session_execute(session_, statement);
auto retrieve_cb = [](CassFuture* future, void* data) {
CassError rc = cass_future_error_code(future);
Wrapper* wrapper = (Wrapper*)data;
if (rc == CASS_OK) {
const CassResult* result = cass_future_get_result(future);
if (cass_result_row_count(result)) {
CassIterator* iterator = cass_iterator_from_result(result);
CassString cass_receiver, cass_time, cass_msg_id,
cass_group_id, cass_msg, cass_sender;
while (cass_iterator_next(iterator)) {
const CassRow* row = cass_iterator_get_row(iterator);
cass_value_get_string(cass_row_get_column(row, 0), &cass_receiver);
cass_value_get_string(cass_row_get_column(row, 1), &cass_time);
cass_value_get_string(cass_row_get_column(row, 2), &cass_msg_id);
cass_value_get_string(cass_row_get_column(row, 3), &cass_group_id);
cass_value_get_string(cass_row_get_column(row, 4), &cass_msg);
cass_value_get_string(cass_row_get_column(row, 5), &cass_sender);
std::string receiver(cass_receiver.data, cass_receiver.length);
std::string time(cass_time.data, cass_time.length);
std::string msg_id(cass_msg_id.data, cass_msg_id.length);
std::string group_id(cass_group_id.data, cass_group_id.length);
std::string msg(cass_msg.data, cass_msg.length);
std::string sender(cass_sender.data, cass_sender.length);
boost::shared_ptr<Message> message(new Message());
message->__set_receiver_id(receiver);
message->__set_timestamp(time);
message->__set_msg_id(msg_id);
message->__set_group_id(group_id);
message->__set_msg(msg);
message->__set_sender_id(sender);
wrapper->pmsgs->push_back(message);
}
cass_bool_t has_more_pages = cass_result_has_more_pages(result);
if (has_more_pages) {
cass_statement_set_paging_state(wrapper->statement, result);
(wrapper->func)();
} else {
cass_statement_free(wrapper->statement);
CassStatement* statement =
cass_prepared_bind(wrapper->this_obj->delete_prepared_);
cass_statement_bind_string(statement, 0, cass_receiver);
CassFuture* delete_future =
cass_session_execute(wrapper->this_obj->session_, statement);
cass_future_free(delete_future);
cass_statement_free(statement);
(wrapper->cob)(true, wrapper);
}
cass_iterator_free(iterator);
} else {
cass_statement_free(wrapper->statement);
(wrapper->cob)(true, wrapper);
}
cass_result_free(result);
} else {
cass_statement_free(wrapper->statement);
wrapper->this_obj->PrintError(future);
(wrapper->cob)(false, wrapper);
}
};
data_wrapper->this_obj = this;
data_wrapper->cob = cob;
data_wrapper->statement = statement;
data_wrapper->func = [=]() {
CassFuture* future = cass_session_execute(session_, statement);
cass_future_set_callback(future, retrieve_cb, data_wrapper);
cass_future_free(future);
};
cass_future_set_callback(future, retrieve_cb, data_wrapper);
cass_future_free(future);
}
} // namespace pushing