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driver-cassandra.c
1666 lines (1440 loc) · 49.3 KB
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driver-cassandra.c
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/* Copyright (c) 2015-2017 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "array.h"
#include "hex-binary.h"
#include "str.h"
#include "ioloop.h"
#include "net.h"
#include "write-full.h"
#include "time-util.h"
#include "var-expand.h"
#include "settings-parser.h"
#include "sql-api-private.h"
#ifdef BUILD_CASSANDRA
#include <fcntl.h>
#include <unistd.h>
#include <cassandra.h>
#define IS_CONNECTED(db) \
((db)->api.state != SQL_DB_STATE_DISCONNECTED && \
(db)->api.state != SQL_DB_STATE_CONNECTING)
#define CASSANDRA_FALLBACK_WARN_INTERVAL_SECS 60
#define CASSANDRA_FALLBACK_FIRST_RETRY_MSECS 50
#define CASSANDRA_FALLBACK_MAX_RETRY_MSECS (1000*60)
#define CASS_QUERY_DEFAULT_WARN_TIMEOUT_MSECS (5*1000)
typedef void driver_cassandra_callback_t(CassFuture *future, void *context);
enum cassandra_counter_type {
CASSANDRA_COUNTER_TYPE_QUERY_SENT,
CASSANDRA_COUNTER_TYPE_QUERY_RECV_OK,
CASSANDRA_COUNTER_TYPE_QUERY_RECV_ERR_NO_HOSTS,
CASSANDRA_COUNTER_TYPE_QUERY_RECV_ERR_QUEUE_FULL,
CASSANDRA_COUNTER_TYPE_QUERY_RECV_ERR_CLIENT_TIMEOUT,
CASSANDRA_COUNTER_TYPE_QUERY_RECV_ERR_SERVER_TIMEOUT,
CASSANDRA_COUNTER_TYPE_QUERY_RECV_ERR_SERVER_UNAVAILABLE,
CASSANDRA_COUNTER_TYPE_QUERY_RECV_ERR_OTHER,
CASSANDRA_COUNTER_TYPE_QUERY_SLOW,
CASSANDRA_COUNTER_COUNT
};
static const char *counter_names[CASSANDRA_COUNTER_COUNT] = {
"sent",
"recv_ok",
"recv_err_no_hosts",
"recv_err_queue_full",
"recv_err_client_timeout",
"recv_err_server_timeout",
"recv_err_server_unavailable",
"recv_err_other",
"slow",
};
enum cassandra_query_type {
CASSANDRA_QUERY_TYPE_READ,
CASSANDRA_QUERY_TYPE_READ_MORE,
CASSANDRA_QUERY_TYPE_WRITE,
CASSANDRA_QUERY_TYPE_DELETE
};
#define CASSANDRA_QUERY_TYPE_COUNT 3
static const char *cassandra_query_type_names[CASSANDRA_QUERY_TYPE_COUNT] = {
"read", "write", "delete"
};
struct cassandra_callback {
unsigned int id;
CassFuture *future;
struct cassandra_db *db;
driver_cassandra_callback_t *callback;
void *context;
};
struct cassandra_db {
struct sql_db api;
char *hosts, *keyspace, *user, *password;
CassConsistency read_consistency, write_consistency, delete_consistency;
CassConsistency read_fallback_consistency, write_fallback_consistency, delete_fallback_consistency;
CassLogLevel log_level;
bool debug_queries;
bool latency_aware_routing;
unsigned int protocol_version;
unsigned int num_threads;
unsigned int connect_timeout_msecs, request_timeout_msecs;
unsigned int warn_timeout_msecs;
unsigned int heartbeat_interval_secs, idle_timeout_secs;
unsigned int execution_retry_interval_msecs, execution_retry_times;
unsigned int page_size;
in_port_t port;
CassCluster *cluster;
CassSession *session;
CassTimestampGen *timestamp_gen;
int fd_pipe[2];
struct io *io_pipe;
ARRAY(struct cassandra_callback *) callbacks;
ARRAY(struct cassandra_result *) results;
unsigned int callback_ids;
char *metrics_path;
struct timeout *to_metrics;
uint64_t counters[CASSANDRA_COUNTER_COUNT];
struct timeval primary_query_last_sent[CASSANDRA_QUERY_TYPE_COUNT];
time_t last_fallback_warning[CASSANDRA_QUERY_TYPE_COUNT];
unsigned int fallback_failures[CASSANDRA_QUERY_TYPE_COUNT];
/* for synchronous queries: */
struct ioloop *ioloop, *orig_ioloop;
struct sql_result *sync_result;
char *error;
};
struct cassandra_result {
struct sql_result api;
CassStatement *statement;
const CassResult *result;
CassIterator *iterator;
char *query;
char *error;
CassConsistency consistency, fallback_consistency;
enum cassandra_query_type query_type;
struct timeval page0_start_time, start_time, finish_time;
unsigned int row_count, total_row_count, page_num;
pool_t row_pool;
ARRAY_TYPE(const_string) fields;
ARRAY(size_t) field_sizes;
sql_query_callback_t *callback;
void *context;
bool query_sent:1;
bool finished:1;
bool paging_continues:1;
};
struct cassandra_transaction_context {
struct sql_transaction_context ctx;
int refcount;
sql_commit_callback_t *callback;
void *context;
pool_t query_pool;
char *error;
bool begin_succeeded:1;
bool begin_failed:1;
bool failed:1;
};
extern const struct sql_db driver_cassandra_db;
extern const struct sql_result driver_cassandra_result;
static struct {
CassConsistency consistency;
const char *name;
} cass_consistency_names[] = {
{ CASS_CONSISTENCY_ANY, "any" },
{ CASS_CONSISTENCY_ONE, "one" },
{ CASS_CONSISTENCY_TWO, "two" },
{ CASS_CONSISTENCY_THREE, "three" },
{ CASS_CONSISTENCY_QUORUM, "" },
{ CASS_CONSISTENCY_ALL, "all" },
{ CASS_CONSISTENCY_QUORUM, "" },
{ CASS_CONSISTENCY_ALL, "all" },
{ CASS_CONSISTENCY_LOCAL_QUORUM, "local-quorum" },
{ CASS_CONSISTENCY_EACH_QUORUM, "each-quorum" },
{ CASS_CONSISTENCY_SERIAL, "serial" },
{ CASS_CONSISTENCY_LOCAL_SERIAL, "local-serial" },
{ CASS_CONSISTENCY_LOCAL_ONE, "local-one" }
};
static struct {
CassLogLevel log_level;
const char *name;
} cass_log_level_names[] = {
{ CASS_LOG_CRITICAL, "critical" },
{ CASS_LOG_ERROR, "error" },
{ CASS_LOG_WARN, "warn" },
{ CASS_LOG_INFO, "info" },
{ CASS_LOG_DEBUG, "debug" },
{ CASS_LOG_TRACE, "trace" }
};
static void driver_cassandra_result_send_query(struct cassandra_result *result);
static void driver_cassandra_send_queries(struct cassandra_db *db);
static void result_finish(struct cassandra_result *result);
static int consistency_parse(const char *str, CassConsistency *consistency_r)
{
unsigned int i;
for (i = 0; i < N_ELEMENTS(cass_consistency_names); i++) {
if (strcmp(cass_consistency_names[i].name, str) == 0) {
*consistency_r = cass_consistency_names[i].consistency;
return 0;
}
}
return -1;
}
static int log_level_parse(const char *str, CassLogLevel *log_level_r)
{
unsigned int i;
for (i = 0; i < N_ELEMENTS(cass_log_level_names); i++) {
if (strcmp(cass_log_level_names[i].name, str) == 0) {
*log_level_r = cass_log_level_names[i].log_level;
return 0;
}
}
return -1;
}
static void driver_cassandra_set_state(struct cassandra_db *db, enum sql_db_state state)
{
/* switch back to original ioloop in case the caller wants to
add/remove timeouts */
if (db->ioloop != NULL)
io_loop_set_current(db->orig_ioloop);
sql_db_set_state(&db->api, state);
if (db->ioloop != NULL)
io_loop_set_current(db->ioloop);
}
static void driver_cassandra_close(struct cassandra_db *db, const char *error)
{
struct cassandra_result *const *resultp;
if (db->io_pipe != NULL)
io_remove(&db->io_pipe);
if (db->fd_pipe[0] != -1) {
i_close_fd(&db->fd_pipe[0]);
i_close_fd(&db->fd_pipe[1]);
}
driver_cassandra_set_state(db, SQL_DB_STATE_DISCONNECTED);
while (array_count(&db->results) > 0) {
resultp = array_idx(&db->results, 0);
if ((*resultp)->error == NULL)
(*resultp)->error = i_strdup(error);
result_finish(*resultp);
}
if (db->ioloop != NULL) {
/* running a sync query, stop it */
io_loop_stop(db->ioloop);
}
}
static void driver_cassandra_log_error(CassFuture *future, const char *str)
{
const char *message;
size_t size;
cass_future_error_message(future, &message, &size);
i_error("cassandra: %s: %.*s", str, (int)size, message);
}
static void driver_cassandra_future_callback(CassFuture *future ATTR_UNUSED,
void *context)
{
struct cassandra_callback *cb = context;
/* this isn't the main thread - communicate with main thread by
writing the callback id to the pipe. note that we must not use
almost any dovecot functions here because most of them are using
data-stack, which isn't thread-safe. especially don't use
i_error() here. */
if (write_full(cb->db->fd_pipe[1], &cb->id, sizeof(cb->id)) < 0) {
const char *str = t_strdup_printf(
"cassandra: write(pipe) failed: %s\n",
strerror(errno));
(void)write_full(STDERR_FILENO, str, strlen(str));
}
}
static void cassandra_callback_run(struct cassandra_callback *cb)
{
cb->callback(cb->future, cb->context);
cass_future_free(cb->future);
i_free(cb);
}
static void driver_cassandra_input_id(struct cassandra_db *db, unsigned int id)
{
struct cassandra_callback *cb, *const *cbp;
/* usually there are only a few callbacks, so don't bother with using
a hash table */
array_foreach(&db->callbacks, cbp) {
cb = *cbp;
if (cb->id == id) {
array_delete(&db->callbacks,
array_foreach_idx(&db->callbacks, cbp), 1);
cassandra_callback_run(cb);
return;
}
}
i_panic("cassandra: Received unknown ID %u", id);
}
static void driver_cassandra_input(struct cassandra_db *db)
{
unsigned int ids[1024];
ssize_t ret;
ret = read(db->fd_pipe[0], ids, sizeof(ids));
if (ret < 0)
i_error("cassandra: read(pipe) failed: %m");
else if (ret == 0)
i_error("cassandra: read(pipe) failed: EOF");
else if (ret % sizeof(ids[0]) != 0)
i_error("cassandra: read(pipe) returned wrong amount of data");
else {
/* success */
unsigned int i, count = ret / sizeof(ids[0]);
for (i = 0; i < count && db->api.state != SQL_DB_STATE_DISCONNECTED; i++)
driver_cassandra_input_id(db, ids[i]);
return;
}
driver_cassandra_close(db, "IPC pipe closed");
}
static void
driver_cassandra_set_callback(CassFuture *future, struct cassandra_db *db,
driver_cassandra_callback_t *callback,
void *context)
{
struct cassandra_callback *cb;
cb = i_new(struct cassandra_callback, 1);
cb->id = ++db->callback_ids;
cb->future = future;
cb->callback = callback;
cb->context = context;
cb->db = db;
array_append(&db->callbacks, &cb, 1);
cass_future_set_callback(future, driver_cassandra_future_callback, cb);
}
static void connect_callback(CassFuture *future, void *context)
{
struct cassandra_db *db = context;
CassError rc;
if ((rc = cass_future_error_code(future)) != CASS_OK) {
driver_cassandra_log_error(future,
"Couldn't connect to Cassandra");
driver_cassandra_close(db, "Couldn't connect to Cassandra");
return;
}
driver_cassandra_set_state(db, SQL_DB_STATE_IDLE);
if (db->ioloop != NULL) {
/* driver_cassandra_sync_init() waiting for connection to
finish */
io_loop_stop(db->ioloop);
}
driver_cassandra_send_queries(db);
}
static int driver_cassandra_connect(struct sql_db *_db)
{
struct cassandra_db *db = (struct cassandra_db *)_db;
CassFuture *future;
i_assert(db->api.state == SQL_DB_STATE_DISCONNECTED);
if (pipe(db->fd_pipe) < 0) {
i_error("pipe() failed: %m");
return -1;
}
db->io_pipe = io_add(db->fd_pipe[0], IO_READ,
driver_cassandra_input, db);
driver_cassandra_set_state(db, SQL_DB_STATE_CONNECTING);
future = cass_session_connect_keyspace(db->session, db->cluster, db->keyspace);
driver_cassandra_set_callback(future, db, connect_callback, db);
return 0;
}
static void driver_cassandra_disconnect(struct sql_db *_db)
{
struct cassandra_db *db = (struct cassandra_db *)_db;
driver_cassandra_close(db, "Disconnected");
}
static const char *
driver_cassandra_escape_string(struct sql_db *db ATTR_UNUSED,
const char *string)
{
string_t *escaped;
unsigned int i;
if (strchr(string, '\'') == NULL)
return string;
escaped = t_str_new(strlen(string)+10);
for (i = 0; string[i] != '\0'; i++) {
if (string[i] == '\'')
str_append_c(escaped, '\'');
str_append_c(escaped, string[i]);
}
return str_c(escaped);
}
static void driver_cassandra_parse_connect_string(struct cassandra_db *db,
const char *connect_string)
{
const char *const *args, *key, *value, *error;
string_t *hosts = t_str_new(64);
bool read_fallback_set = FALSE, write_fallback_set = FALSE, delete_fallback_set = FALSE;
db->log_level = CASS_LOG_WARN;
db->read_consistency = CASS_CONSISTENCY_LOCAL_QUORUM;
db->write_consistency = CASS_CONSISTENCY_LOCAL_QUORUM;
db->delete_consistency = CASS_CONSISTENCY_LOCAL_QUORUM;
db->connect_timeout_msecs = SQL_CONNECT_TIMEOUT_SECS*1000;
db->request_timeout_msecs = SQL_QUERY_TIMEOUT_SECS*1000;
db->warn_timeout_msecs = CASS_QUERY_DEFAULT_WARN_TIMEOUT_MSECS;
args = t_strsplit_spaces(connect_string, " ");
for (; *args != NULL; args++) {
value = strchr(*args, '=');
if (value == NULL) {
i_fatal("cassandra: Missing value in connect string: %s",
*args);
}
key = t_strdup_until(*args, value++);
if (strcmp(key, "host") == 0) {
if (str_len(hosts) > 0)
str_append_c(hosts, ',');
str_append(hosts, value);
} else if (strcmp(key, "port") == 0) {
if (net_str2port(value, &db->port) < 0)
i_fatal("cassandra: Invalid port: %s", value);
} else if (strcmp(key, "dbname") == 0 ||
strcmp(key, "keyspace") == 0) {
i_free(db->keyspace);
db->keyspace = i_strdup(value);
} else if (strcmp(key, "user") == 0) {
i_free(db->user);
db->user = i_strdup(value);
} else if (strcmp(key, "password") == 0) {
i_free(db->password);
db->password = i_strdup(value);
} else if (strcmp(key, "read_consistency") == 0) {
if (consistency_parse(value, &db->read_consistency) < 0)
i_fatal("cassandra: Unknown read_consistency: %s", value);
} else if (strcmp(key, "read_fallback_consistency") == 0) {
if (consistency_parse(value, &db->read_fallback_consistency) < 0)
i_fatal("cassandra: Unknown read_fallback_consistency: %s", value);
read_fallback_set = TRUE;
} else if (strcmp(key, "write_consistency") == 0) {
if (consistency_parse(value, &db->write_consistency) < 0)
i_fatal("cassandra: Unknown write_consistency: %s", value);
} else if (strcmp(key, "write_fallback_consistency") == 0) {
if (consistency_parse(value, &db->write_fallback_consistency) < 0)
i_fatal("cassandra: Unknown write_fallback_consistency: %s", value);
write_fallback_set = TRUE;
} else if (strcmp(key, "delete_consistency") == 0) {
if (consistency_parse(value, &db->delete_consistency) < 0)
i_fatal("cassandra: Unknown delete_consistency: %s", value);
} else if (strcmp(key, "delete_fallback_consistency") == 0) {
if (consistency_parse(value, &db->delete_fallback_consistency) < 0)
i_fatal("cassandra: Unknown delete_fallback_consistency: %s", value);
delete_fallback_set = TRUE;
} else if (strcmp(key, "log_level") == 0) {
if (log_level_parse(value, &db->log_level) < 0)
i_fatal("cassandra: Unknown log_level: %s", value);
} else if (strcmp(key, "debug_queries") == 0) {
db->debug_queries = TRUE;
} else if (strcmp(key, "latency_aware_routing") == 0) {
db->latency_aware_routing = TRUE;
} else if (strcmp(key, "version") == 0) {
if (str_to_uint(value, &db->protocol_version) < 0)
i_fatal("cassandra: Invalid version: %s", value);
} else if (strcmp(key, "num_threads") == 0) {
if (str_to_uint(value, &db->num_threads) < 0)
i_fatal("cassandra: Invalid num_threads: %s", value);
} else if (strcmp(key, "heartbeat_interval") == 0) {
if (settings_get_time(value, &db->heartbeat_interval_secs, &error) < 0)
i_fatal("cassandra: Invalid heartbeat_interval '%s': %s", value, error);
} else if (strcmp(key, "idle_timeout") == 0) {
if (settings_get_time(value, &db->idle_timeout_secs, &error) < 0)
i_fatal("cassandra: Invalid idle_timeout '%s': %s", value, error);
} else if (strcmp(key, "connect_timeout") == 0) {
if (settings_get_time_msecs(value, &db->connect_timeout_msecs, &error) < 0)
i_fatal("cassandra: Invalid connect_timeout '%s': %s", value, error);
} else if (strcmp(key, "request_timeout") == 0) {
if (settings_get_time_msecs(value, &db->request_timeout_msecs, &error) < 0)
i_fatal("cassandra: Invalid request_timeout '%s': %s", value, error);
} else if (strcmp(key, "warn_timeout") == 0) {
if (settings_get_time_msecs(value, &db->warn_timeout_msecs, &error) < 0)
i_fatal("cassandra: Invalid warn_timeout '%s': %s", value, error);
} else if (strcmp(key, "metrics") == 0) {
i_free(db->metrics_path);
db->metrics_path = i_strdup(value);
} else if (strcmp(key, "execution_retry_interval") == 0) {
if (settings_get_time_msecs(value, &db->execution_retry_interval_msecs, &error) < 0)
i_fatal("cassandra: Invalid execution_retry_interval '%s': %s", value, error);
#ifndef HAVE_CASSANDRA_SPECULATIVE_POLICY
i_fatal("cassandra: This cassandra version does not support execution_retry_interval");
#endif
} else if (strcmp(key, "execution_retry_times") == 0) {
if (str_to_uint(value, &db->execution_retry_times) < 0)
i_fatal("cassandra: Invalid execution_retry_times %s", value);
#ifndef HAVE_CASSANDRA_SPECULATIVE_POLICY
i_fatal("cassandra: This cassandra version does not support execution_retry_times");
#endif
} else if (strcmp(key, "page_size") == 0) {
if (str_to_uint(value, &db->page_size) < 0)
i_fatal("cassandra: Invalid page_size: %s", value);
} else {
i_fatal("cassandra: Unknown connect string: %s", key);
}
}
if (!read_fallback_set)
db->read_fallback_consistency = db->read_consistency;
if (!write_fallback_set)
db->write_fallback_consistency = db->write_consistency;
if (!delete_fallback_set)
db->delete_fallback_consistency = db->delete_consistency;
if (str_len(hosts) == 0)
i_fatal("cassandra: No hosts given in connect string");
if (db->keyspace == NULL)
i_fatal("cassandra: No dbname given in connect string");
db->hosts = i_strdup(str_c(hosts));
}
static void
driver_cassandra_get_metrics_json(struct cassandra_db *db, string_t *dest)
{
#define ADD_UINT64(_struct, _field) \
str_printfa(dest, "\""#_field"\": %llu,", (unsigned long long)metrics._struct._field);
#define ADD_DOUBLE(_struct, _field) \
str_printfa(dest, "\""#_field"\": %02lf,", metrics._struct._field);
CassMetrics metrics;
cass_session_get_metrics(db->session, &metrics);
str_append(dest, "{ \"requests\": {");
ADD_UINT64(requests, min);
ADD_UINT64(requests, max);
ADD_UINT64(requests, mean);
ADD_UINT64(requests, stddev);
ADD_UINT64(requests, median);
ADD_UINT64(requests, percentile_75th);
ADD_UINT64(requests, percentile_95th);
ADD_UINT64(requests, percentile_98th);
ADD_UINT64(requests, percentile_99th);
ADD_UINT64(requests, percentile_999th);
ADD_DOUBLE(requests, mean_rate);
ADD_DOUBLE(requests, one_minute_rate);
ADD_DOUBLE(requests, five_minute_rate);
ADD_DOUBLE(requests, fifteen_minute_rate);
str_truncate(dest, str_len(dest)-1);
str_append(dest, "}, \"stats\": {");
ADD_UINT64(stats, total_connections);
ADD_UINT64(stats, available_connections);
ADD_UINT64(stats, exceeded_pending_requests_water_mark);
ADD_UINT64(stats, exceeded_write_bytes_water_mark);
str_truncate(dest, str_len(dest)-1);
str_append(dest, "}, \"errors\": {");
ADD_UINT64(errors, connection_timeouts);
ADD_UINT64(errors, pending_request_timeouts);
ADD_UINT64(errors, request_timeouts);
str_truncate(dest, str_len(dest)-1);
str_append(dest, "}, \"queries\": {");
for (unsigned int i = 0; i < CASSANDRA_COUNTER_COUNT; i++) {
str_printfa(dest, "\"%s\": %llu,", counter_names[i],
(unsigned long long)db->counters[i]);
}
str_truncate(dest, str_len(dest)-1);
str_append(dest, "}}");
}
static void driver_cassandra_metrics_write(struct cassandra_db *db)
{
struct var_expand_table tab[] = {
{ '\0', NULL, NULL }
};
string_t *path = t_str_new(64);
string_t *data;
const char *error;
int fd;
if (var_expand(path, db->metrics_path, tab, &error) <= 0) {
i_error("cassandra: Failed to expand metrics_path=%s: %s",
db->metrics_path, error);
return;
}
fd = open(str_c(path), O_WRONLY | O_CREAT | O_TRUNC | O_NONBLOCK, 0600);
if (fd == -1) {
i_error("creat(%s) failed: %m", str_c(path));
return;
}
data = t_str_new(1024);
driver_cassandra_get_metrics_json(db, data);
if (write_full(fd, str_data(data), str_len(data)) < 0)
i_error("write(%s) failed: %m", str_c(path));
i_close_fd(&fd);
}
static struct sql_db *driver_cassandra_init_v(const char *connect_string)
{
struct cassandra_db *db;
db = i_new(struct cassandra_db, 1);
db->api = driver_cassandra_db;
db->fd_pipe[0] = db->fd_pipe[1] = -1;
T_BEGIN {
driver_cassandra_parse_connect_string(db, connect_string);
} T_END;
cass_log_set_level(db->log_level);
db->timestamp_gen = cass_timestamp_gen_monotonic_new();
db->cluster = cass_cluster_new();
cass_cluster_set_timestamp_gen(db->cluster, db->timestamp_gen);
cass_cluster_set_connect_timeout(db->cluster, db->connect_timeout_msecs);
cass_cluster_set_request_timeout(db->cluster, db->request_timeout_msecs);
cass_cluster_set_contact_points(db->cluster, db->hosts);
if (db->user != NULL && db->password != NULL)
cass_cluster_set_credentials(db->cluster, db->user, db->password);
if (db->port != 0)
cass_cluster_set_port(db->cluster, db->port);
if (db->protocol_version != 0)
cass_cluster_set_protocol_version(db->cluster, db->protocol_version);
if (db->num_threads != 0)
cass_cluster_set_num_threads_io(db->cluster, db->num_threads);
if (db->latency_aware_routing)
cass_cluster_set_latency_aware_routing(db->cluster, cass_true);
if (db->heartbeat_interval_secs != 0)
cass_cluster_set_connection_heartbeat_interval(db->cluster, db->heartbeat_interval_secs);
if (db->idle_timeout_secs != 0)
cass_cluster_set_connection_idle_timeout(db->cluster, db->idle_timeout_secs);
#ifdef HAVE_CASSANDRA_SPECULATIVE_POLICY
if (db->execution_retry_times > 0 && db->execution_retry_interval_msecs > 0)
cass_cluster_set_constant_speculative_execution_policy(db->cluster, db->execution_retry_interval_msecs, db->execution_retry_times);
#endif
db->session = cass_session_new();
if (db->metrics_path != NULL)
db->to_metrics = timeout_add(1000, driver_cassandra_metrics_write, db);
i_array_init(&db->results, 16);
i_array_init(&db->callbacks, 16);
return &db->api;
}
static void driver_cassandra_deinit_v(struct sql_db *_db)
{
struct cassandra_db *db = (struct cassandra_db *)_db;
driver_cassandra_close(db, "Deinitialized");
i_assert(array_count(&db->callbacks) == 0);
array_free(&db->callbacks);
i_assert(array_count(&db->results) == 0);
array_free(&db->results);
cass_session_free(db->session);
cass_cluster_free(db->cluster);
cass_timestamp_gen_free(db->timestamp_gen);
if (db->to_metrics != NULL)
timeout_remove(&db->to_metrics);
i_free(db->metrics_path);
i_free(db->hosts);
i_free(db->error);
i_free(db->keyspace);
i_free(db->user);
i_free(db->password);
array_free(&_db->module_contexts);
i_free(db);
}
static void driver_cassandra_result_unlink(struct cassandra_db *db,
struct cassandra_result *result)
{
struct cassandra_result *const *results;
unsigned int i, count;
results = array_get(&db->results, &count);
for (i = 0; i < count; i++) {
if (results[i] == result) {
array_delete(&db->results, i, 1);
return;
}
}
i_unreached();
}
static void driver_cassandra_log_result(struct cassandra_result *result,
bool all_pages, long long reply_usecs)
{
struct cassandra_db *db = (struct cassandra_db *)result->api.db;
struct timeval now;
unsigned int row_count;
if (db->log_level < CASS_LOG_DEBUG && !db->debug_queries &&
reply_usecs/1000 < db->warn_timeout_msecs)
return;
if (gettimeofday(&now, NULL) < 0)
i_fatal("gettimeofday() failed: %m");
string_t *str = t_str_new(128);
str_printfa(str, "cassandra: Finished query '%s' (", result->query);
if (all_pages) {
str_printfa(str, "%u pages in total, ", result->page_num);
row_count = result->total_row_count;
} else {
if (result->page_num > 0 || result->paging_continues)
str_printfa(str, "page %u, ", result->page_num);
row_count = result->row_count;
}
str_printfa(str, "%u rows, %lld+%lld us): %s", row_count, reply_usecs,
timeval_diff_usecs(&now, &result->finish_time),
result->error != NULL ? result->error : "success");
if (reply_usecs/1000 >= db->warn_timeout_msecs) {
db->counters[CASSANDRA_COUNTER_TYPE_QUERY_SLOW]++;
i_warning("%s", str_c(str));
} else {
i_debug("%s", str_c(str));
}
}
static void driver_cassandra_result_free(struct sql_result *_result)
{
struct cassandra_db *db = (struct cassandra_db *)_result->db;
struct cassandra_result *result = (struct cassandra_result *)_result;
long long reply_usecs;
i_assert(!result->api.callback);
i_assert(result->callback == NULL);
if (_result == db->sync_result)
db->sync_result = NULL;
reply_usecs = timeval_diff_usecs(&result->finish_time, &result->start_time);
driver_cassandra_log_result(result, FALSE, reply_usecs);
if (result->page_num > 0 && !result->paging_continues) {
/* Multi-page query finishes now. Log a debug/warning summary
message about it separate from the per-page messages. */
reply_usecs = timeval_diff_usecs(&result->finish_time,
&result->page0_start_time);
driver_cassandra_log_result(result, TRUE, reply_usecs);
}
if (result->result != NULL)
cass_result_free(result->result);
if (result->iterator != NULL)
cass_iterator_free(result->iterator);
if (result->statement != NULL)
cass_statement_free(result->statement);
if (result->row_pool != NULL)
pool_unref(&result->row_pool);
i_free(result->query);
i_free(result->error);
i_free(result);
}
static void result_finish(struct cassandra_result *result)
{
struct cassandra_db *db = (struct cassandra_db *)result->api.db;
bool free_result = TRUE;
result->finished = TRUE;
result->finish_time = ioloop_timeval;
driver_cassandra_result_unlink(db, result);
i_assert((result->error != NULL) == (result->iterator == NULL));
result->api.callback = TRUE;
T_BEGIN {
result->callback(&result->api, result->context);
} T_END;
result->api.callback = FALSE;
free_result = db->sync_result != &result->api;
if (db->ioloop != NULL)
io_loop_stop(db->ioloop);
i_assert(!free_result || result->api.refcount > 0);
result->callback = NULL;
if (free_result)
sql_result_unref(&result->api);
}
static void query_resend_with_fallback(struct cassandra_result *result)
{
struct cassandra_db *db = (struct cassandra_db *)result->api.db;
time_t last_warning =
ioloop_time - db->last_fallback_warning[result->query_type];
if (last_warning >= CASSANDRA_FALLBACK_WARN_INTERVAL_SECS) {
i_warning("%s - retrying future %s queries with consistency %s (instead of %s)",
result->error, cassandra_query_type_names[result->query_type],
cass_consistency_string(result->fallback_consistency),
cass_consistency_string(result->consistency));
db->last_fallback_warning[result->query_type] = ioloop_time;
}
i_free_and_null(result->error);
db->fallback_failures[result->query_type]++;
result->consistency = result->fallback_consistency;
driver_cassandra_result_send_query(result);
}
static void counters_inc_error(struct cassandra_db *db, CassError error)
{
switch (error) {
case CASS_ERROR_LIB_NO_HOSTS_AVAILABLE:
db->counters[CASSANDRA_COUNTER_TYPE_QUERY_RECV_ERR_NO_HOSTS]++;
break;
case CASS_ERROR_LIB_REQUEST_QUEUE_FULL:
db->counters[CASSANDRA_COUNTER_TYPE_QUERY_RECV_ERR_QUEUE_FULL]++;
break;
case CASS_ERROR_LIB_REQUEST_TIMED_OUT:
db->counters[CASSANDRA_COUNTER_TYPE_QUERY_RECV_ERR_CLIENT_TIMEOUT]++;
break;
case CASS_ERROR_SERVER_WRITE_TIMEOUT:
db->counters[CASSANDRA_COUNTER_TYPE_QUERY_RECV_ERR_SERVER_TIMEOUT]++;
break;
case CASS_ERROR_SERVER_UNAVAILABLE:
db->counters[CASSANDRA_COUNTER_TYPE_QUERY_RECV_ERR_SERVER_UNAVAILABLE]++;
break;
default:
db->counters[CASSANDRA_COUNTER_TYPE_QUERY_RECV_ERR_OTHER]++;
break;
}
}
static void query_callback(CassFuture *future, void *context)
{
struct cassandra_result *result = context;
struct cassandra_db *db = (struct cassandra_db *)result->api.db;
CassError error = cass_future_error_code(future);
if (error != CASS_OK) {
const char *errmsg;
size_t errsize;
int msecs;
cass_future_error_message(future, &errmsg, &errsize);
i_free(result->error);
msecs = timeval_diff_msecs(&ioloop_timeval, &result->start_time);
counters_inc_error(db, error);
/* Timeouts bring uncertainty whether the query succeeded or
not. Also _SERVER_UNAVAILABLE could have actually written
enough copies of the data for the query to succeed. */
result->api.error_type = error == CASS_ERROR_SERVER_WRITE_TIMEOUT ||
error == CASS_ERROR_SERVER_UNAVAILABLE ||
error == CASS_ERROR_LIB_REQUEST_TIMED_OUT ?
SQL_RESULT_ERROR_TYPE_WRITE_UNCERTAIN :
SQL_RESULT_ERROR_TYPE_UNKNOWN;
result->error = i_strdup_printf("Query '%s' failed: %.*s (in %u.%03u secs%s)",
result->query, (int)errsize, errmsg, msecs/1000, msecs%1000,
result->page_num == 0 ? "" : t_strdup_printf(", page %u", result->page_num));
/* unavailable = cassandra server knows that there aren't
enough nodes available. "All hosts in current policy
attempted and were either unavailable or failed"
no hosts available = The client library couldn't connect to
enough cassanra nodes. Error message is the same as for
"unavailable".
write timeout = cassandra server couldn't reach all the
needed nodes. this may be because it hasn't yet detected
that the servers are down, or because the servers are just
too busy. we'll try the fallback consistency to avoid
unnecessary temporary errors. */
if ((error == CASS_ERROR_SERVER_UNAVAILABLE ||
error == CASS_ERROR_LIB_NO_HOSTS_AVAILABLE ||
error == CASS_ERROR_SERVER_WRITE_TIMEOUT) &&
result->fallback_consistency != result->consistency) {
/* retry with fallback consistency */
query_resend_with_fallback(result);
return;
}
result_finish(result);
return;
}
db->counters[CASSANDRA_COUNTER_TYPE_QUERY_RECV_OK]++;
if (result->fallback_consistency != result->consistency) {
/* non-fallback query finished successfully. if there had been
any fallbacks, reset them. */
db->fallback_failures[result->query_type] = 0;
}
result->result = cass_future_get_result(future);
result->iterator = cass_iterator_from_result(result->result);
result_finish(result);
}
static void driver_cassandra_init_statement(struct cassandra_result *result)
{
struct cassandra_db *db = (struct cassandra_db *)result->api.db;
if (result->statement != NULL) {
/* continuing a paged result */
return;
}
result->statement = cass_statement_new(result->query, 0);
cass_statement_set_consistency(result->statement, result->consistency);
#ifdef HAVE_CASSANDRA_SPECULATIVE_POLICY
cass_statement_set_is_idempotent(result->statement, cass_true);
#endif
if (db->page_size > 0)
cass_statement_set_paging_size(result->statement, db->page_size);
}
static void driver_cassandra_result_send_query(struct cassandra_result *result)
{
struct cassandra_db *db = (struct cassandra_db *)result->api.db;
CassFuture *future;
db->counters[CASSANDRA_COUNTER_TYPE_QUERY_SENT]++;
driver_cassandra_init_statement(result);
future = cass_session_execute(db->session, result->statement);
driver_cassandra_set_callback(future, db, query_callback, result);
}
static bool
driver_cassandra_want_fallback_query(struct cassandra_result *result)
{
struct cassandra_db *db = (struct cassandra_db *)result->api.db;
unsigned int failure_count = db->fallback_failures[result->query_type];
unsigned int i, msecs = CASSANDRA_FALLBACK_FIRST_RETRY_MSECS;
struct timeval tv;
if (failure_count == 0)
return FALSE;
/* double the retries every time. */
for (i = 1; i < failure_count; i++) {
msecs *= 2;
if (msecs >= CASSANDRA_FALLBACK_MAX_RETRY_MSECS) {
msecs = CASSANDRA_FALLBACK_MAX_RETRY_MSECS;
break;
}
}
/* If last primary query sent timestamp + msecs is older than current
time, we need to retry the primary query. Note that this practically
prevents multiple primary queries from being attempted
simultaneously, because the caller updates primary_query_last_sent
immediately when returning.
The only time when multiple primary queries can be running in
parallel is when the earlier query is being slow and hasn't finished
early enough. This could even be a wanted feature, since while the
first query might have to wait for a timeout, Cassandra could have
been fixed in the meantime and the second query finishes
successfully. */
tv = db->primary_query_last_sent[result->query_type];
timeval_add_msecs(&tv, msecs);
return timeval_cmp(&ioloop_timeval, &tv) < 0;
}
static int driver_cassandra_send_query(struct cassandra_result *result)
{
struct cassandra_db *db = (struct cassandra_db *)result->api.db;
int ret;
if (!SQL_DB_IS_READY(&db->api)) {
if ((ret = sql_connect(&db->api)) <= 0) {
if (ret < 0)
driver_cassandra_close(db, "Couldn't connect to Cassandra");
return ret;
}
}
if (result->page0_start_time.tv_sec == 0)
result->page0_start_time = ioloop_timeval;
result->start_time = ioloop_timeval;
result->row_pool = pool_alloconly_create("cassandra result", 512);
switch (result->query_type) {
case CASSANDRA_QUERY_TYPE_READ:
result->consistency = db->read_consistency;