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driver-cassandra.c
2265 lines (1968 loc) · 66.7 KB
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driver-cassandra.c
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/* Copyright (c) 2015-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "array.h"
#include "hostpid.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 <stdio.h>
#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,
CASSANDRA_QUERY_TYPE_COUNT
};
static const char *cassandra_query_type_names[CASSANDRA_QUERY_TYPE_COUNT] = {
"read", "read-more", "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_sql_prepared_statement *) pending_prepares;
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;
cass_int64_t timestamp;
pool_t row_pool;
ARRAY_TYPE(const_string) fields;
ARRAY(size_t) field_sizes;
sql_query_callback_t *callback;
void *context;
bool is_prepared:1;
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;
struct cassandra_sql_statement *stmt;
char *query;
cass_int64_t query_timestamp;
char *error;
bool begin_succeeded:1;
bool begin_failed:1;
bool failed:1;
};
struct cassandra_sql_arg {
unsigned int column_idx;
char *value_str;
const unsigned char *value_binary;
size_t value_binary_size;
int64_t value_int64;
};
struct cassandra_sql_statement {
struct sql_statement stmt;
struct cassandra_sql_prepared_statement *prep;
CassStatement *cass_stmt;
ARRAY(struct cassandra_sql_arg) pending_args;
cass_int64_t timestamp;
struct cassandra_result *result;
};
struct cassandra_sql_prepared_statement {
struct sql_prepared_statement prep_stmt;
char *query_template;
/* NULL, until the prepare is asynchronously finished */
const CassPrepared *prepared;
/* statements waiting for prepare to finish */
ARRAY(struct cassandra_sql_statement *) pending_statements;
/* an error here will cause the prepare to be retried on the next
execution attempt. */
char *error;
bool pending;
};
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, "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_prepare_pending(struct cassandra_db *db);
static void
prepare_finish_pending_statements(struct cassandra_sql_prepared_statement *prep_stmt);
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 void
driver_cassandra_log_handler(const CassLogMessage* message,
void *data ATTR_UNUSED)
{
enum log_type log_type = LOG_TYPE_ERROR;
const char *log_level_str = "";
switch (message->severity) {
case CASS_LOG_DISABLED:
case CASS_LOG_LAST_ENTRY:
i_unreached();
case CASS_LOG_CRITICAL:
log_type = LOG_TYPE_PANIC;
break;
case CASS_LOG_ERROR:
log_type = LOG_TYPE_ERROR;
break;
case CASS_LOG_WARN:
log_type = LOG_TYPE_WARNING;
break;
case CASS_LOG_INFO:
log_type = LOG_TYPE_INFO;
break;
case CASS_LOG_TRACE:
log_level_str = "[TRACE] ";
/* fall through */
case CASS_LOG_DEBUG:
log_type = LOG_TYPE_DEBUG;
break;
}
/* NOTE: We may not be in the main thread. We can't use the
standard Dovecot functions that may use data stack. That's why
we can't use i_log_type() in here, but have to re-implement the
internal logging protocol. Otherwise preserve Cassandra's own
logging format. */
fprintf(stderr, "\001%c%s %u.%03u %s(%s:%d:%s): %s\n",
log_type+1, my_pid,
(unsigned int)(message->time_ms / 1000),
(unsigned int)(message->time_ms % 1000),
log_level_str,
message->file, message->line, message->function,
message->message);
}
static void driver_cassandra_init_log(void)
{
failure_callback_t *fatal_callback, *error_callback;
failure_callback_t *info_callback, *debug_callback;
i_get_failure_handlers(&fatal_callback, &error_callback,
&info_callback, &debug_callback);
if (i_failure_handler_is_internal(debug_callback)) {
/* Using internal logging protocol. Use it ourself to set log
levels correctly. */
cass_log_set_callback(driver_cassandra_log_handler, NULL);
}
}
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_sql_prepared_statement *const *prep_stmtp;
struct cassandra_result *const *resultp;
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);
array_foreach(&db->pending_prepares, prep_stmtp) {
(*prep_stmtp)->pending = FALSE;
(*prep_stmtp)->error = i_strdup(error);
prepare_finish_pending_statements(*prep_stmtp);
}
array_clear(&db->pending_prepares);
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_prepare_pending(db);
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 int driver_cassandra_parse_connect_string(struct cassandra_db *db,
const char *connect_string,
const char **error_r)
{
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) {
*error_r = t_strdup_printf("Missing value in connect string: %s",
*args);
return -1;
}
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) {
*error_r = t_strdup_printf("Invalid port: %s", value);
return -1;
}
} 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) {
*error_r = t_strdup_printf("Unknown read_consistency: %s", value);
return -1;
}
} else if (strcmp(key, "read_fallback_consistency") == 0) {
if (consistency_parse(value, &db->read_fallback_consistency) < 0) {
*error_r = t_strdup_printf("Unknown read_fallback_consistency: %s", value);
return -1;
}
read_fallback_set = TRUE;
} else if (strcmp(key, "write_consistency") == 0) {
if (consistency_parse(value, &db->write_consistency) < 0) {
*error_r = t_strdup_printf("Unknown write_consistency: %s", value);
return -1;
}
} else if (strcmp(key, "write_fallback_consistency") == 0) {
if (consistency_parse(value, &db->write_fallback_consistency) < 0) {
*error_r = t_strdup_printf("Unknown write_fallback_consistency: %s", value);
return -1;
}
write_fallback_set = TRUE;
} else if (strcmp(key, "delete_consistency") == 0) {
if (consistency_parse(value, &db->delete_consistency) < 0) {
*error_r = t_strdup_printf("Unknown delete_consistency: %s", value);
return -1;
}
} else if (strcmp(key, "delete_fallback_consistency") == 0) {
if (consistency_parse(value, &db->delete_fallback_consistency) < 0) {
*error_r = t_strdup_printf("Unknown delete_fallback_consistency: %s", value);
return -1;
}
delete_fallback_set = TRUE;
} else if (strcmp(key, "log_level") == 0) {
if (log_level_parse(value, &db->log_level) < 0) {
*error_r = t_strdup_printf("Unknown log_level: %s", value);
return -1;
}
} 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) {
*error_r = t_strdup_printf("Invalid version: %s", value);
return -1;
}
} else if (strcmp(key, "num_threads") == 0) {
if (str_to_uint(value, &db->num_threads) < 0) {
*error_r = t_strdup_printf("Invalid num_threads: %s", value);
return -1;
}
} else if (strcmp(key, "heartbeat_interval") == 0) {
if (settings_get_time(value, &db->heartbeat_interval_secs, &error) < 0) {
*error_r = t_strdup_printf("Invalid heartbeat_interval '%s': %s", value, error);
return -1;
}
} else if (strcmp(key, "idle_timeout") == 0) {
if (settings_get_time(value, &db->idle_timeout_secs, &error) < 0) {
*error_r = t_strdup_printf("Invalid idle_timeout '%s': %s", value, error);
return -1;
}
} else if (strcmp(key, "connect_timeout") == 0) {
if (settings_get_time_msecs(value, &db->connect_timeout_msecs, &error) < 0) {
*error_r = t_strdup_printf("Invalid connect_timeout '%s': %s", value, error);
return -1;
}
} else if (strcmp(key, "request_timeout") == 0) {
if (settings_get_time_msecs(value, &db->request_timeout_msecs, &error) < 0) {
*error_r = t_strdup_printf("Invalid request_timeout '%s': %s", value, error);
return -1;
}
} else if (strcmp(key, "warn_timeout") == 0) {
if (settings_get_time_msecs(value, &db->warn_timeout_msecs, &error) < 0) {
*error_r = t_strdup_printf("Invalid warn_timeout '%s': %s", value, error);
return -1;
}
} 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) {
*error_r = t_strdup_printf("Invalid execution_retry_interval '%s': %s", value, error);
return -1;
}
#ifndef HAVE_CASSANDRA_SPECULATIVE_POLICY
*error_r = t_strdup_printf("This cassandra version does not support execution_retry_interval");
return -1;
#endif
} else if (strcmp(key, "execution_retry_times") == 0) {
if (str_to_uint(value, &db->execution_retry_times) < 0) {
*error_r = t_strdup_printf("Invalid execution_retry_times %s", value);
return -1;
}
#ifndef HAVE_CASSANDRA_SPECULATIVE_POLICY
*error_r = t_strdup_printf("This cassandra version does not support execution_retry_times");
return -1;
#endif
} else if (strcmp(key, "page_size") == 0) {
if (str_to_uint(value, &db->page_size) < 0) {
*error_r = t_strdup_printf("Invalid page_size: %s", value);
return -1;
}
} else {
*error_r = t_strdup_printf("Unknown connect string: %s", key);
return -1;
}
}
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) {
*error_r = t_strdup_printf("No hosts given in connect string");
return -1;
}
if (db->keyspace == NULL) {
*error_r = t_strdup_printf("No dbname given in connect string");
return -1;
}
db->hosts = i_strdup(str_c(hosts));
return 0;
}
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\": %"PRIu64",", counter_names[i],
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 void driver_cassandra_free(struct cassandra_db **_db)
{
struct cassandra_db *db = *_db;
*_db = NULL;
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->api.module_contexts);
i_free(db);
}
static int driver_cassandra_init_full_v(const struct sql_settings *set,
struct sql_db **db_r, const char **error_r)
{
struct cassandra_db *db;
char *error = NULL;
int ret;
db = i_new(struct cassandra_db, 1);
db->api = driver_cassandra_db;
db->fd_pipe[0] = db->fd_pipe[1] = -1;
T_BEGIN {
const char *tmp;
if ((ret = driver_cassandra_parse_connect_string(db, set->connect_string,
&tmp)) < 0) {
error = i_strdup(tmp);
}
} T_END;
if (ret < 0) {
*error_r = t_strdup(error);
i_free(error);
driver_cassandra_free(&db);
return -1;
}
driver_cassandra_init_log();
cass_log_set_level(db->log_level);
if (db->protocol_version > 0 && db->protocol_version < 4) {
/* binding with column indexes requires v4 */
db->api.v.prepared_statement_init = NULL;
db->api.v.prepared_statement_deinit = NULL;
db->api.v.statement_init_prepared = NULL;
}
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);
i_array_init(&db->pending_prepares, 16);
*db_r = &db->api;
return 0;
}
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);
i_assert(array_count(&db->pending_prepares) == 0);
array_free(&db->pending_prepares);
cass_session_free(db->session);
cass_cluster_free(db->cluster);
cass_timestamp_gen_free(db->timestamp_gen);
timeout_remove(&db->to_metrics);
driver_cassandra_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 %squery '%s' (",
result->is_prepared ? "prepared " : "", result->query);
if (result->timestamp != 0)
str_printfa(str, "timestamp=%"PRId64", ", result->timestamp);
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);
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);
}