/* Sends an ismaster command to the server and returns an array of new
* connectable nodes
*
* Returns:
* 0: when an error occurred
* 1: when is master was run and worked
* 2: when is master wasn't run due to the time-out limit
* 3: when it all worked, but we need to remove the seed host (due to its name
* not being what the server thought it is) - in that case, the server in
* the last argument is changed
* 4: when the call worked, but wasn't within our supported wire version range */
int mongo_connection_ismaster(mongo_con_manager *manager, mongo_connection *con, mongo_server_options *options, char **repl_set_name, int *nr_hosts, char ***found_hosts, char **error_message, mongo_server_def *server)
{
mcon_str *packet;
char *data_buffer;
int32_t max_bson_size = 0, max_message_size = 0, max_write_batch_size = 0;
int32_t min_wire_version = 0, max_wire_version = 0;
char *set = NULL; /* For replicaset in return */
char *hosts, *passives = NULL, *ptr, *string;
char *msg; /* If set and its value is "isdbgrid", it signals we connected to a mongos */
unsigned char ismaster = 0, secondary = 0, arbiter = 0;
char *connected_name, *we_think_we_are;
char *tags;
struct timeval now;
int retval = 1;
gettimeofday(&now, NULL);
if (((server ? con->last_replcheck : con->last_ismaster) + manager->ismaster_interval) > now.tv_sec) {
mongo_manager_log(manager, MLOG_CON, MLOG_FINE, "ismaster: skipping: last ran at %ld, now: %ld, time left: %ld", con->last_ismaster, now.tv_sec, con->last_ismaster + manager->ismaster_interval - now.tv_sec);
return 2;
}
mongo_manager_log(manager, MLOG_CON, MLOG_INFO, "ismaster: start");
packet = bson_create_ismaster_packet(con);
if (!mongo_connect_send_packet(manager, con, options, packet, &data_buffer, error_message)) {
return 0;
}
/* Find data fields */
ptr = data_buffer + sizeof(int32_t); /* Skip the length */
/* Find [min|max]WireVersion */
if (bson_find_field_as_int32(ptr, "minWireVersion", &min_wire_version)) {
mongo_manager_log(manager, MLOG_CON, MLOG_FINE, "ismaster: setting minWireVersion to %d", min_wire_version);
con->min_wire_version = min_wire_version;
} else {
mongo_manager_log(manager, MLOG_CON, MLOG_FINE, "ismaster: can't find minWireVersion, defaulting to %d", con->min_wire_version);
}
if (bson_find_field_as_int32(ptr, "maxWireVersion", &max_wire_version)) {
mongo_manager_log(manager, MLOG_CON, MLOG_FINE, "ismaster: setting maxWireVersion to %d", max_wire_version);
con->max_wire_version = max_wire_version;
} else {
mongo_manager_log(manager, MLOG_CON, MLOG_FINE, "ismaster: can't find maxWireVersion, defaulting to %d", con->max_wire_version);
}
if (!manager->supports_wire_version(con->min_wire_version, con->max_wire_version, error_message)) {
/* Error message set by supports_wire_version */
free(data_buffer);
return 4;
}
/* Find max bson size */
if (bson_find_field_as_int32(ptr, "maxBsonObjectSize", &max_bson_size)) {
mongo_manager_log(manager, MLOG_CON, MLOG_FINE, "ismaster: setting maxBsonObjectSize to %d", max_bson_size);
con->max_bson_size = max_bson_size;
} else {
mongo_manager_log(manager, MLOG_CON, MLOG_FINE, "ismaster: can't find maxBsonObjectSize, defaulting to %d", con->max_bson_size);
}
/* Find max message size */
if (bson_find_field_as_int32(ptr, "maxMessageSizeBytes", &max_message_size)) {
mongo_manager_log(manager, MLOG_CON, MLOG_FINE, "ismaster: setting maxMessageSizeBytes to %d", max_message_size);
con->max_message_size = max_message_size;
} else {
mongo_manager_log(manager, MLOG_CON, MLOG_FINE, "ismaster: can't find maxMessageSizeBytes, defaulting to %d", con->max_message_size);
}
/* Find max batch item size */
if (bson_find_field_as_int32(ptr, "maxWriteBatchSize", &max_write_batch_size)) {
mongo_manager_log(manager, MLOG_CON, MLOG_FINE, "ismaster: setting maxWriteBatchSize to %d", max_write_batch_size);
con->max_write_batch_size = max_write_batch_size;
} else {
mongo_manager_log(manager, MLOG_CON, MLOG_FINE, "ismaster: can't find maxWriteBatchSize, defaulting to %d", con->max_write_batch_size);
}
/* Check for flags */
bson_find_field_as_bool(ptr, "ismaster", &ismaster);
bson_find_field_as_bool(ptr, "secondary", &secondary);
bson_find_field_as_bool(ptr, "arbiterOnly", &arbiter);
bson_find_field_as_string(ptr, "setName", &set);
mongo_manager_log(manager, MLOG_CON, MLOG_INFO, "ismaster: set name: %s, ismaster: %d, secondary: %d, is_arbiter: %d", set, ismaster, secondary, arbiter);
/* Set connection type depending on flags */
if (ismaster) {
/* Find msg and whether it contains "isdbgrid" */
if (bson_find_field_as_string(ptr, "msg", (char**) &msg) && strcmp(msg, "isdbgrid") == 0) {
mongo_manager_log(manager, MLOG_CON, MLOG_FINE, "ismaster: msg contains 'isdbgrid' - we're connected to a mongos");
con->connection_type = MONGO_NODE_MONGOS;
} else if(set) {
con->connection_type = MONGO_NODE_PRIMARY;
} else {
con->connection_type = MONGO_NODE_STANDALONE;
}
} else if (secondary) {
con->connection_type = MONGO_NODE_SECONDARY;
} else if (arbiter) {
con->connection_type = MONGO_NODE_ARBITER;
} else if (!set) {
/* If there is no set, we assume this is an "old style" "slave" node */
con->connection_type = MONGO_NODE_SECONDARY;
} else {
con->connection_type = MONGO_NODE_INVALID;
}
if (con->connection_type == MONGO_NODE_INVALID) {
*error_message = strdup("ismaster: got unknown node type");
free(data_buffer);
return 0;
}
/* Find read preferences tags */
con->tag_count = 0;
con->tags = NULL;
if (bson_find_field_as_document(ptr, "tags", (char**) &tags)) {
char *it, *name, *value;
int length;
it = tags;
while (bson_array_find_next_string(&it, &name, &value)) {
con->tags = realloc(con->tags, (con->tag_count + 1) * sizeof(char*));
length = strlen(name) + strlen(value) + 2;
con->tags[con->tag_count] = malloc(length);
snprintf(con->tags[con->tag_count], length, "%s:%s", name, value);
free(name);
mongo_manager_log(manager, MLOG_CON, MLOG_FINE, "ismaster: added tag %s", con->tags[con->tag_count]);
con->tag_count++;
}
}
/* If we get passed in a server it means we want to validate this node against it, along with discovery ReplicaSet stuff */
if (!server) {
goto done;
}
/* We find out whether the machine we connected too, is actually the
* one we thought we were connecting too */
/* MongoDB 1.8.x doesn't have the "me" field.
* The replicaset verification is done next step (setName). */
if (bson_find_field_as_string(ptr, "me", &connected_name)) {
we_think_we_are = mongo_server_hash_to_server(con->hash);
if (strcmp(connected_name, we_think_we_are) == 0) {
mongo_manager_log(manager, MLOG_CON, MLOG_FINE, "ismaster: the server name matches what we thought it'd be (%s).", we_think_we_are);
} else {
mongo_manager_log(manager, MLOG_CON, MLOG_WARN, "ismaster: the server name (%s) did not match with what we thought it'd be (%s).", connected_name, we_think_we_are);
/* We reset the name as the server responded with a different name than
* what we thought it was */
free(server->host);
server->host = mcon_strndup(connected_name, strchr(connected_name, ':') - connected_name);
server->port = atoi(strchr(connected_name, ':') + 1);
retval = 3;
}
free(we_think_we_are);
} else {
mongo_manager_log(manager, MLOG_CON, MLOG_WARN, "Can't find 'me' in ismaster response, possibly not a replicaset (%s)", mongo_server_hash_to_server(con->hash));
}
/* Do replica set name test */
if (!set) {
char *errmsg = NULL;
bson_find_field_as_string(ptr, "errmsg", &errmsg);
if (errmsg) {
*error_message = strdup(errmsg);
} else {
*error_message = strdup("Not a replicaset member");
}
free(data_buffer);
return 0;
} else if (*repl_set_name) {
if (strcmp(set, *repl_set_name) != 0) {
struct mcon_str *tmp;
mcon_str_ptr_init(tmp);
mcon_str_add(tmp, "Host does not match replicaset name. Expected: ", 0);
mcon_str_add(tmp, *repl_set_name, 0);
mcon_str_add(tmp, "; Found: ", 0);
mcon_str_add(tmp, set, 0);
*error_message = strdup(tmp->d);
mcon_str_ptr_dtor(tmp);
free(data_buffer);
return 0;
} else {
mongo_manager_log(manager, MLOG_CON, MLOG_FINE, "ismaster: the found replicaset name matches the expected one (%s).", set);
}
} else if (*repl_set_name == NULL) {
/* This can happen, in case the replicaset name was not given, but just
* bool(true) (or string("1")) in the connection options. */
mongo_manager_log(manager, MLOG_CON, MLOG_WARN, "ismaster: the replicaset name is not set, so we're using %s.", set);
*repl_set_name = strdup(set);
}
/* If the server definition has not set the repl_set_name member yet, set it here */
if (!server->repl_set_name) {
server->repl_set_name = strdup(set);
}
/* Find all hosts */
bson_find_field_as_array(ptr, "hosts", &hosts);
bson_find_field_as_array(ptr, "passives", &passives);
*nr_hosts = 0;
/* Iterate over the "hosts" document */
ptr = hosts;
while (bson_array_find_next_string(&ptr, NULL, &string)) {
(*nr_hosts)++;
*found_hosts = realloc(*found_hosts, (*nr_hosts) * sizeof(char*));
(*found_hosts)[*nr_hosts-1] = strdup(string);
mongo_manager_log(manager, MLOG_CON, MLOG_INFO, "found host: %s", string);
}
/* Iterate over the "passives" document (priority=0) */
if (passives) {
ptr = passives;
while (bson_array_find_next_string(&ptr, NULL, &string)) {
(*nr_hosts)++;
*found_hosts = realloc(*found_hosts, (*nr_hosts) * sizeof(char*));
(*found_hosts)[*nr_hosts-1] = strdup(string);
mongo_manager_log(manager, MLOG_CON, MLOG_INFO, "found host: %s (passive)", string);
}
}
con->last_replcheck = now.tv_sec;
done:
free(data_buffer);
con->last_ismaster = now.tv_sec;
mongo_manager_log(manager, MLOG_CON, MLOG_INFO, "ismaster: last ran at %ld", con->last_ismaster);
return retval;
}
/**
* Sends an ismaster command to the server and returns an array of new
* connectable nodes
*
* Returns:
* 0: when an error occurred
* 1: when is master was run and worked
* 2: when is master wasn't run due to the time-out limit
* 3: when it all worked, but we need to remove the seed host (due to its name
* not being what the server thought it is) - in that case, the server in
* the last argument is changed
*/
int mongo_connection_ismaster(mongo_con_manager *manager, mongo_connection *con, char **repl_set_name, int *nr_hosts, char ***found_hosts, char **error_message, mongo_server_def *server)
{
mcon_str *packet;
char *data_buffer;
char *set = NULL; /* For replicaset in return */
char *hosts, *ptr, *string;
unsigned char ismaster = 0, arbiter = 0;
char *connected_name, *we_think_we_are;
struct timeval now;
int retval = 1;
gettimeofday(&now, NULL);
if ((con->last_ismaster + manager->ismaster_interval) > now.tv_sec) {
mongo_manager_log(manager, MLOG_CON, MLOG_FINE, "ismaster: skipping: last ran at %ld, now: %ld, time left: %ld", con->last_ismaster, now.tv_sec, con->last_ismaster + manager->ismaster_interval - now.tv_sec);
return 2;
}
mongo_manager_log(manager, MLOG_CON, MLOG_INFO, "ismaster: start");
packet = bson_create_ismaster_packet(con);
if (!mongo_connect_send_packet(manager, con, packet, &data_buffer, error_message)) {
return 0;
}
/* Find data fields */
ptr = data_buffer + sizeof(int32_t); /* Skip the length */
/* We find out whether the machine we connected too, is actually the
* one we thought we were connecting too */
if (!bson_find_field_as_string(ptr, "me", &connected_name)) {
struct mcon_str *tmp;
mcon_str_ptr_init(tmp);
mcon_str_add(tmp, "Host does not seem to be a replicaset member (", 0);
mcon_str_add(tmp, mongo_server_hash_to_server(con->hash), 1);
mcon_str_add(tmp, ")", 0);
*error_message = strdup(tmp->d);
mcon_str_ptr_dtor(tmp);
mongo_manager_log(manager, MLOG_CON, MLOG_WARN, *error_message);
free(data_buffer);
return 0;
}
we_think_we_are = mongo_server_hash_to_server(con->hash);
if (strcmp(connected_name, we_think_we_are) == 0) {
mongo_manager_log(manager, MLOG_CON, MLOG_FINE, "ismaster: the server name matches what we thought it'd be (%s).", we_think_we_are);
} else {
mongo_manager_log(manager, MLOG_CON, MLOG_WARN, "ismaster: the server name (%s) did not match with what we thought it'd be (%s).", connected_name, we_think_we_are);
/* We reset the name as the server responded with a different name than
* what we thought it was */
free(server->host);
server->host = mcon_strndup(connected_name, strchr(connected_name, ':') - connected_name);
server->port = atoi(strchr(connected_name, ':') + 1);
retval = 3;
}
free(we_think_we_are);
/* Do replica set name test */
bson_find_field_as_string(ptr, "setName", &set);
if (!set) {
char *errmsg = NULL;
bson_find_field_as_string(ptr, "errmsg", &errmsg);
if (errmsg) {
*error_message = strdup(errmsg);
} else {
*error_message = strdup("Not a replicaset member");
}
free(data_buffer);
return 0;
} else if (*repl_set_name) {
if (strcmp(set, *repl_set_name) != 0) {
struct mcon_str *tmp;
mcon_str_ptr_init(tmp);
mcon_str_add(tmp, "Host does not match replicaset name. Expected: ", 0);
mcon_str_add(tmp, *repl_set_name, 0);
mcon_str_add(tmp, "; Found: ", 0);
mcon_str_add(tmp, set, 0);
*error_message = strdup(tmp->d);
mcon_str_ptr_dtor(tmp);
free(data_buffer);
return 0;
} else {
mongo_manager_log(manager, MLOG_CON, MLOG_FINE, "ismaster: the found replicaset name matches the expected one (%s).", set);
}
} else if (*repl_set_name == NULL) {
/* This can happen, in case the replicaset name was not given, but just
* bool(true) (or string("1")) in the connection options. */
mongo_manager_log(manager, MLOG_CON, MLOG_WARN, "ismaster: the replicaset name is not set, so we're using %s.", set);
*repl_set_name = strdup(set);
}
/* If the server definition has not set the repl_set_name member yet, set it here */
if (!server->repl_set_name) {
server->repl_set_name = strdup(set);
}
/* Check for flags */
bson_find_field_as_bool(ptr, "ismaster", &ismaster);
bson_find_field_as_bool(ptr, "arbiterOnly", &arbiter);
/* Find all hosts */
bson_find_field_as_array(ptr, "hosts", &hosts);
mongo_manager_log(manager, MLOG_CON, MLOG_INFO, "ismaster: set name: %s, ismaster: %d, is_arbiter: %d", set, ismaster, arbiter);
*nr_hosts = 0;
ptr = hosts;
while (bson_array_find_next_string(&ptr, NULL, &string)) {
(*nr_hosts)++;
*found_hosts = realloc(*found_hosts, (*nr_hosts) * sizeof(char*));
(*found_hosts)[*nr_hosts-1] = strdup(string);
mongo_manager_log(manager, MLOG_CON, MLOG_INFO, "found host: %s", string);
}
/* Set connection type depending on flags */
if (ismaster) {
con->connection_type = MONGO_NODE_PRIMARY;
} else if (arbiter) {
con->connection_type = MONGO_NODE_ARBITER;
} else {
con->connection_type = MONGO_NODE_SECONDARY;
} /* TODO: case for mongos */
free(data_buffer);
con->last_ismaster = now.tv_sec;
mongo_manager_log(manager, MLOG_CON, MLOG_INFO, "ismaster: last ran at %ld", con->last_ismaster);
return retval;
}
/* Sends an ismaster command to the server and returns an array of new
* connectable nodes
*
* Returns:
* 0: when an error occurred
* 1: when is master was run and worked
* 2: when is master wasn't run due to the time-out limit
* 3: when it all worked, but we need to remove the seed host (due to its name
* not being what the server thought it is) - in that case, the server in
* the last argument is changed */
int mongo_connection_ismaster(mongo_con_manager *manager, mongo_connection *con, mongo_server_options *options, char **repl_set_name, int *nr_hosts, char ***found_hosts, char **error_message, mongo_server_def *server)
{
mcon_str *packet;
char *data_buffer;
char *set = NULL; /* For replicaset in return */
char *hosts, *passives = NULL, *ptr, *string;
char *connected_name, *we_think_we_are;
struct timeval now;
int retval = 1;
gettimeofday(&now, NULL);
if ((con->last_ismaster + manager->ismaster_interval) > now.tv_sec) {
mongo_manager_log(manager, MLOG_CON, MLOG_FINE, "ismaster: skipping: last ran at %ld, now: %ld, time left: %ld", con->last_ismaster, now.tv_sec, con->last_ismaster + manager->ismaster_interval - now.tv_sec);
return 2;
}
mongo_manager_log(manager, MLOG_CON, MLOG_INFO, "ismaster: start");
packet = bson_create_ismaster_packet(con);
if (!mongo_connect_send_packet(manager, con, options, packet, &data_buffer, error_message)) {
return 0;
}
/* Find data fields */
ptr = data_buffer + sizeof(int32_t); /* Skip the length */
/* We find out whether the machine we connected too, is actually the
* one we thought we were connecting too */
/* MongoDB 1.8.x doesn't have the "me" field.
* The replicaset verification is done next step (setName). */
if (bson_find_field_as_string(ptr, "me", &connected_name)) {
we_think_we_are = mongo_server_hash_to_server(con->hash);
if (strcmp(connected_name, we_think_we_are) == 0) {
mongo_manager_log(manager, MLOG_CON, MLOG_FINE, "ismaster: the server name matches what we thought it'd be (%s).", we_think_we_are);
} else {
mongo_manager_log(manager, MLOG_CON, MLOG_WARN, "ismaster: the server name (%s) did not match with what we thought it'd be (%s).", connected_name, we_think_we_are);
/* We reset the name as the server responded with a different name than
* what we thought it was */
free(server->host);
server->host = mcon_strndup(connected_name, strchr(connected_name, ':') - connected_name);
server->port = atoi(strchr(connected_name, ':') + 1);
retval = 3;
}
free(we_think_we_are);
} else {
mongo_manager_log(manager, MLOG_CON, MLOG_WARN, "Can't find 'me' in ismaster response, possibly not a replicaset (%s)", mongo_server_hash_to_server(con->hash));
}
/* Do replica set name test */
bson_find_field_as_string(ptr, "setName", &set);
if (!set) {
char *errmsg = NULL;
bson_find_field_as_string(ptr, "errmsg", &errmsg);
if (errmsg) {
*error_message = strdup(errmsg);
} else {
*error_message = strdup("Not a replicaset member");
}
free(data_buffer);
return 0;
} else if (*repl_set_name) {
if (strcmp(set, *repl_set_name) != 0) {
struct mcon_str *tmp;
mcon_str_ptr_init(tmp);
mcon_str_add(tmp, "Host does not match replicaset name. Expected: ", 0);
mcon_str_add(tmp, *repl_set_name, 0);
mcon_str_add(tmp, "; Found: ", 0);
mcon_str_add(tmp, set, 0);
*error_message = strdup(tmp->d);
mcon_str_ptr_dtor(tmp);
free(data_buffer);
return 0;
} else {
mongo_manager_log(manager, MLOG_CON, MLOG_FINE, "ismaster: the found replicaset name matches the expected one (%s).", set);
}
} else if (*repl_set_name == NULL) {
/* This can happen, in case the replicaset name was not given, but just
* bool(true) (or string("1")) in the connection options. */
mongo_manager_log(manager, MLOG_CON, MLOG_WARN, "ismaster: the replicaset name is not set, so we're using %s.", set);
*repl_set_name = strdup(set);
}
/* If the server definition has not set the repl_set_name member yet, set it here */
if (!server->repl_set_name) {
server->repl_set_name = strdup(set);
}
/* Find all hosts */
bson_find_field_as_array(ptr, "hosts", &hosts);
bson_find_field_as_array(ptr, "passives", &passives);
*nr_hosts = 0;
/* Iterate over the "hosts" document */
ptr = hosts;
while (bson_array_find_next_string(&ptr, NULL, &string)) {
(*nr_hosts)++;
*found_hosts = (char**) realloc(*found_hosts, (*nr_hosts) * sizeof(char*));
(*found_hosts)[*nr_hosts-1] = strdup(string);
mongo_manager_log(manager, MLOG_CON, MLOG_INFO, "found host: %s", string);
}
/* Iterate over the "passives" document (priority=0) */
if (passives) {
ptr = passives;
while (bson_array_find_next_string(&ptr, NULL, &string)) {
(*nr_hosts)++;
*found_hosts = (char**) realloc(*found_hosts, (*nr_hosts) * sizeof(char*));
(*found_hosts)[*nr_hosts-1] = strdup(string);
mongo_manager_log(manager, MLOG_CON, MLOG_INFO, "found host: %s (passive)", string);
}
}
free(data_buffer);
con->last_ismaster = now.tv_sec;
mongo_manager_log(manager, MLOG_CON, MLOG_INFO, "ismaster: last ran at %ld", con->last_ismaster);
return retval;
}