diff options
Diffstat (limited to '')
| -rw-r--r-- | exporting/mongodb/mongodb.c | 387 |
1 files changed, 387 insertions, 0 deletions
diff --git a/exporting/mongodb/mongodb.c b/exporting/mongodb/mongodb.c new file mode 100644 index 0000000..44922a2 --- /dev/null +++ b/exporting/mongodb/mongodb.c @@ -0,0 +1,387 @@ +// SPDX-License-Identifier: GPL-3.0-or-later + +#define EXPORTING_INTERNALS +#include "mongodb.h" + +#define CONFIG_FILE_LINE_MAX ((CONFIG_MAX_NAME + CONFIG_MAX_VALUE + 1024) * 2) + +/** + * Initialize MongoDB connector specific data, including a ring buffer + * + * @param instance an instance data structure. + * @return Returns 0 on success, 1 on failure. + */ +int mongodb_init(struct instance *instance) +{ + struct mongodb_specific_config *connector_specific_config = instance->config.connector_specific_config; + mongoc_uri_t *uri; + bson_error_t bson_error; + + if (unlikely(!connector_specific_config->collection || !*connector_specific_config->collection)) { + error("EXPORTING: collection name is a mandatory MongoDB parameter, but it is not configured"); + return 1; + } + + uri = mongoc_uri_new_with_error(instance->config.destination, &bson_error); + if (unlikely(!uri)) { + error( + "EXPORTING: failed to parse URI: %s. Error message: %s", instance->config.destination, bson_error.message); + return 1; + } + + int32_t socket_timeout = + mongoc_uri_get_option_as_int32(uri, MONGOC_URI_SOCKETTIMEOUTMS, instance->config.timeoutms); + if (!mongoc_uri_set_option_as_int32(uri, MONGOC_URI_SOCKETTIMEOUTMS, socket_timeout)) { + error("EXPORTING: failed to set %s to the value %d", MONGOC_URI_SOCKETTIMEOUTMS, socket_timeout); + return 1; + }; + + struct mongodb_specific_data *connector_specific_data = + (struct mongodb_specific_data *)instance->connector_specific_data; + + connector_specific_data->client = mongoc_client_new_from_uri(uri); + if (unlikely(!connector_specific_data->client)) { + error("EXPORTING: failed to create a new client"); + return 1; + } + + if (!mongoc_client_set_appname(connector_specific_data->client, "netdata")) { + error("EXPORTING: failed to set client appname"); + }; + + connector_specific_data->collection = mongoc_client_get_collection( + connector_specific_data->client, connector_specific_config->database, connector_specific_config->collection); + + mongoc_uri_destroy(uri); + + // create a ring buffer + struct bson_buffer *first_buffer = NULL; + + if (instance->config.buffer_on_failures < 2) + instance->config.buffer_on_failures = 1; + else + instance->config.buffer_on_failures -= 1; + + for (int i = 0; i < instance->config.buffer_on_failures; i++) { + struct bson_buffer *current_buffer = callocz(1, sizeof(struct bson_buffer)); + + if (!connector_specific_data->first_buffer) + first_buffer = current_buffer; + else + current_buffer->next = connector_specific_data->first_buffer; + + connector_specific_data->first_buffer = current_buffer; + } + + first_buffer->next = connector_specific_data->first_buffer; + connector_specific_data->last_buffer = connector_specific_data->first_buffer; + + return 0; +} + +/** + * Initialize a MongoDB connector instance + * + * @param instance an instance data structure. + * @return Returns 0 on success, 1 on failure. + */ +int init_mongodb_instance(struct instance *instance) +{ + instance->worker = mongodb_connector_worker; + + instance->start_batch_formatting = NULL; + instance->start_host_formatting = format_host_labels_json_plaintext; + instance->start_chart_formatting = NULL; + + if (EXPORTING_OPTIONS_DATA_SOURCE(instance->config.options) == EXPORTING_SOURCE_DATA_AS_COLLECTED) + instance->metric_formatting = format_dimension_collected_json_plaintext; + else + instance->metric_formatting = format_dimension_stored_json_plaintext; + + instance->end_chart_formatting = NULL; + instance->end_host_formatting = flush_host_labels; + instance->end_batch_formatting = format_batch_mongodb; + + instance->prepare_header = NULL; + instance->check_response = NULL; + + instance->buffer = (void *)buffer_create(0); + if (!instance->buffer) { + error("EXPORTING: cannot create buffer for MongoDB exporting connector instance %s", instance->config.name); + return 1; + } + if (uv_mutex_init(&instance->mutex)) + return 1; + if (uv_cond_init(&instance->cond_var)) + return 1; + + struct mongodb_specific_data *connector_specific_data = callocz(1, sizeof(struct mongodb_specific_data)); + instance->connector_specific_data = (void *)connector_specific_data; + + instance->config.timeoutms = + (instance->config.update_every >= 2) ? (instance->engine->config.update_every * MSEC_PER_SEC - 500) : 1000; + + if (!instance->engine->mongoc_initialized) { + mongoc_init(); + instance->engine->mongoc_initialized = 1; + } + + if (unlikely(mongodb_init(instance))) { + error("EXPORTING: cannot initialize MongoDB exporting connector"); + return 1; + } + + return 0; +} + +/** + * Free an array of BSON structures + * + * @param insert an array of documents. + * @param documents_inserted the number of documents inserted. + */ +void free_bson(bson_t **insert, size_t documents_inserted) +{ + size_t i; + + for (i = 0; i < documents_inserted; i++) + bson_destroy(insert[i]); + + freez(insert); +} + +/** + * Format a batch for the MongoDB connector + * + * @param instance an instance data structure. + * @return Returns 0 on success, 1 on failure. + */ +int format_batch_mongodb(struct instance *instance) +{ + struct mongodb_specific_data *connector_specific_data = + (struct mongodb_specific_data *)instance->connector_specific_data; + struct stats *stats = &instance->stats; + + bson_t **insert = connector_specific_data->last_buffer->insert; + if (insert) { + // ring buffer is full, reuse the oldest element + connector_specific_data->first_buffer = connector_specific_data->first_buffer->next; + free_bson(insert, connector_specific_data->last_buffer->documents_inserted); + connector_specific_data->total_documents_inserted -= connector_specific_data->last_buffer->documents_inserted; + stats->buffered_bytes -= connector_specific_data->last_buffer->buffered_bytes; + } + insert = callocz((size_t)stats->buffered_metrics, sizeof(bson_t *)); + connector_specific_data->last_buffer->insert = insert; + + BUFFER *buffer = (BUFFER *)instance->buffer; + char *start = (char *)buffer_tostring(buffer); + char *end = start; + + size_t documents_inserted = 0; + + while (*end && documents_inserted <= (size_t)stats->buffered_metrics) { + while (*end && *end != '\n') + end++; + + if (likely(*end)) { + *end = '\0'; + end++; + } else { + break; + } + + bson_error_t bson_error; + insert[documents_inserted] = bson_new_from_json((const uint8_t *)start, -1, &bson_error); + + if (unlikely(!insert[documents_inserted])) { + error( + "EXPORTING: Failed creating a BSON document from a JSON string \"%s\" : %s", start, bson_error.message); + free_bson(insert, documents_inserted); + return 1; + } + + start = end; + + documents_inserted++; + } + + stats->buffered_bytes += connector_specific_data->last_buffer->buffered_bytes = buffer_strlen(buffer); + + buffer_flush(buffer); + + // The stats->buffered_metrics is used in the MongoDB batch formatting as a variable for the number + // of metrics, added in the current iteration, so we are clearing it here. We will use the + // connector_specific_data->total_documents_inserted in the worker to show the statistics. + stats->buffered_metrics = 0; + connector_specific_data->total_documents_inserted += documents_inserted; + + connector_specific_data->last_buffer->documents_inserted = documents_inserted; + connector_specific_data->last_buffer = connector_specific_data->last_buffer->next; + + return 0; +} + +/** + * Clean a MongoDB connector instance up + * + * @param instance an instance data structure. + */ +void mongodb_cleanup(struct instance *instance) +{ + info("EXPORTING: cleaning up instance %s ...", instance->config.name); + + struct mongodb_specific_data *connector_specific_data = + (struct mongodb_specific_data *)instance->connector_specific_data; + + mongoc_collection_destroy(connector_specific_data->collection); + mongoc_client_destroy(connector_specific_data->client); + if (instance->engine->mongoc_initialized) { + mongoc_cleanup(); + instance->engine->mongoc_initialized = 0; + } + + buffer_free(instance->buffer); + + struct bson_buffer *next_buffer = connector_specific_data->first_buffer; + for (int i = 0; i < instance->config.buffer_on_failures; i++) { + struct bson_buffer *current_buffer = next_buffer; + next_buffer = next_buffer->next; + + if (current_buffer->insert) + free_bson(current_buffer->insert, current_buffer->documents_inserted); + freez(current_buffer); + } + + freez(connector_specific_data); + + struct mongodb_specific_config *connector_specific_config = + (struct mongodb_specific_config *)instance->config.connector_specific_config; + freez(connector_specific_config->database); + freez(connector_specific_config->collection); + freez(connector_specific_config); + + info("EXPORTING: instance %s exited", instance->config.name); + instance->exited = 1; + + return; +} + +/** + * MongoDB connector worker + * + * Runs in a separate thread for every instance. + * + * @param instance_p an instance data structure. + */ +void mongodb_connector_worker(void *instance_p) +{ + struct instance *instance = (struct instance *)instance_p; + struct mongodb_specific_config *connector_specific_config = instance->config.connector_specific_config; + struct mongodb_specific_data *connector_specific_data = + (struct mongodb_specific_data *)instance->connector_specific_data; + + while (!instance->engine->exit) { + struct stats *stats = &instance->stats; + + uv_mutex_lock(&instance->mutex); + if (!connector_specific_data->first_buffer->insert || + !connector_specific_data->first_buffer->documents_inserted) { + while (!instance->data_is_ready) + uv_cond_wait(&instance->cond_var, &instance->mutex); + instance->data_is_ready = 0; + } + + if (unlikely(instance->engine->exit)) { + uv_mutex_unlock(&instance->mutex); + break; + } + + // reset the monitoring chart counters + stats->received_bytes = + stats->sent_bytes = + stats->sent_metrics = + stats->lost_metrics = + stats->receptions = + stats->transmission_successes = + stats->transmission_failures = + stats->data_lost_events = + stats->lost_bytes = + stats->reconnects = 0; + + bson_t **insert = connector_specific_data->first_buffer->insert; + size_t documents_inserted = connector_specific_data->first_buffer->documents_inserted; + size_t buffered_bytes = connector_specific_data->first_buffer->buffered_bytes; + + connector_specific_data->first_buffer->insert = NULL; + connector_specific_data->first_buffer->documents_inserted = 0; + connector_specific_data->first_buffer->buffered_bytes = 0; + connector_specific_data->first_buffer = connector_specific_data->first_buffer->next; + + uv_mutex_unlock(&instance->mutex); + + size_t data_size = 0; + for (size_t i = 0; i < documents_inserted; i++) { + data_size += insert[i]->len; + } + + debug( + D_BACKEND, + "EXPORTING: mongodb_insert(): destination = %s, database = %s, collection = %s, data size = %zu", + instance->config.destination, + connector_specific_config->database, + connector_specific_config->collection, + data_size); + + if (likely(documents_inserted != 0)) { + bson_error_t bson_error; + if (likely(mongoc_collection_insert_many( + connector_specific_data->collection, + (const bson_t **)insert, + documents_inserted, + NULL, + NULL, + &bson_error))) { + stats->sent_metrics = documents_inserted; + stats->sent_bytes += data_size; + stats->transmission_successes++; + stats->receptions++; + } else { + // oops! we couldn't send (all or some of the) data + error("EXPORTING: %s", bson_error.message); + error( + "EXPORTING: failed to write data to the database '%s'. " + "Willing to write %zu bytes, wrote %zu bytes.", + instance->config.destination, data_size, 0UL); + + stats->transmission_failures++; + stats->data_lost_events++; + stats->lost_bytes += buffered_bytes; + stats->lost_metrics += documents_inserted; + } + } + + free_bson(insert, documents_inserted); + + if (unlikely(instance->engine->exit)) + break; + + uv_mutex_lock(&instance->mutex); + + stats->buffered_metrics = connector_specific_data->total_documents_inserted; + + send_internal_metrics(instance); + + connector_specific_data->total_documents_inserted -= documents_inserted; + + stats->buffered_metrics = 0; + stats->buffered_bytes -= buffered_bytes; + + uv_mutex_unlock(&instance->mutex); + +#ifdef UNIT_TESTING + return; +#endif + } + + mongodb_cleanup(instance); +} |