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+/**************************************************************************//**
+ * @file
+ * Source module isolating the ECOMP Vendor Event Listener (EVEL) API.
+ *
+ * This file implements the EVEL library which is intended to provide a
+ * simple wrapper around the complexity of AT&T's Vendor Event Listener API so
+ * that VNFs can use it without worrying about details of:
+ *
+ * * The API's encoding into JSON.
+ * * The API's transport over HTTP/HTTPS.
+ *
+ * License
+ * -------
+ *
+ * Copyright(c) <2016>, AT&T Intellectual Property. All other rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement: This product includes
+ * software developed by the AT&T.
+ * 4. Neither the name of AT&T nor the names of its contributors may be used to
+ * endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY AT&T INTELLECTUAL PROPERTY ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL AT&T INTELLECTUAL PROPERTY BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+#include <string.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <sys/time.h>
+#include <curl/curl.h>
+
+#include "evel.h"
+#include "evel_internal.h"
+#include "evel_throttle.h"
+#include "metadata.h"
+
+/**************************************************************************//**
+ * The type of equipment represented by this VNF.
+ *****************************************************************************/
+EVEL_SOURCE_TYPES event_source_type = EVEL_SOURCE_OTHER;
+
+/**************************************************************************//**
+ * The Functional Role of the equipment represented by this VNF.
+ *****************************************************************************/
+char *functional_role = NULL;
+
+/**************************************************************************//**
+ * Library initialization.
+ *
+ * Initialize the EVEL library.
+ *
+ * @note This function initializes the cURL library. Applications making use
+ * of libcurl may need to pull the initialization out of here. Note
+ * also that this function is not threadsafe as a result - refer to
+ * libcurl's API documentation for relevant warnings.
+ *
+ * @sa Matching Term function.
+ *
+ * @param fqdn The API's FQDN or IP address.
+ * @param port The API's port.
+ * @param path The optional path (may be NULL).
+ * @param topic The optional topic part of the URL (may be NULL).
+ * @param secure Whether to use HTTPS (0=HTTP, 1=HTTPS)
+ * @param username Username for Basic Authentication of requests.
+ * @param password Password for Basic Authentication of requests.
+ * @param source_type The kind of node we represent.
+ * @param role The role this node undertakes.
+ * @param verbosity 0 for normal operation, positive values for chattier
+ * logs.
+ *
+ * @returns Status code
+ * @retval EVEL_SUCCESS On success
+ * @retval ::EVEL_ERR_CODES On failure.
+ *****************************************************************************/
+EVEL_ERR_CODES evel_initialize(const char * const fqdn,
+ int port,
+ const char * const path,
+ const char * const topic,
+ int secure,
+ const char * const username,
+ const char * const password,
+ EVEL_SOURCE_TYPES source_type,
+ const char * const role,
+ int verbosity
+ )
+{
+ EVEL_ERR_CODES rc = EVEL_SUCCESS;
+ char base_api_url[EVEL_MAX_URL_LEN + 1] = {0};
+ char event_api_url[EVEL_MAX_URL_LEN + 1] = {0};
+ char throt_api_url[EVEL_MAX_URL_LEN + 1] = {0};
+ char path_url[EVEL_MAX_URL_LEN + 1] = {0};
+ char topic_url[EVEL_MAX_URL_LEN + 1] = {0};
+ char version_string[10] = {0};
+ int offset;
+
+ /***************************************************************************/
+ /* Check assumptions. */
+ /***************************************************************************/
+ assert(fqdn != NULL);
+ assert(port > 0 && port <= 65535);
+ assert(source_type < EVEL_MAX_SOURCE_TYPES);
+ assert(role != NULL);
+
+ /***************************************************************************/
+ /* Start logging so we can report on progress. */
+ /***************************************************************************/
+ log_initialize(verbosity == 0 ? EVEL_LOG_INFO : EVEL_LOG_DEBUG, "EVEL");
+ EVEL_INFO("EVEL started");
+ EVEL_INFO("API server is: %s", fqdn);
+ EVEL_INFO("API port is: %d", port);
+
+ if (path != NULL)
+ {
+ EVEL_INFO("API path is: %s", path);
+ }
+ else
+ {
+ EVEL_INFO("No API path");
+ }
+
+ if (topic != NULL)
+ {
+ EVEL_INFO("API topic is: %s", topic);
+ }
+ else
+ {
+ EVEL_INFO("No API topic");
+ }
+
+ EVEL_INFO("API transport is: %s", secure ? "HTTPS" : "HTTP");
+ EVEL_INFO("Event Source Type is: %d", source_type);
+ EVEL_INFO("Functional Role is: %s", role);
+ EVEL_INFO("Log verbosity is: %d", verbosity);
+
+ /***************************************************************************/
+ /* Initialize event throttling to the default state. */
+ /***************************************************************************/
+ evel_throttle_initialize();
+
+ /***************************************************************************/
+ /* Save values we will need during operation. */
+ /***************************************************************************/
+ event_source_type = source_type;
+ functional_role = strdup(role);
+
+ /***************************************************************************/
+ /* Ensure there are no trailing zeroes and unnecessary decimal points in */
+ /* the version. */
+ /***************************************************************************/
+ offset = sprintf(version_string, "%d", EVEL_API_MAJOR_VERSION);
+
+ if (EVEL_API_MINOR_VERSION != 0)
+ {
+ sprintf(version_string + offset, ".%d", EVEL_API_MINOR_VERSION);
+ }
+
+ /***************************************************************************/
+ /* Build a common base of the API URLs. */
+ /***************************************************************************/
+ strcpy(path_url, "/");
+ snprintf(base_api_url,
+ EVEL_MAX_URL_LEN,
+ "%s://%s:%d%s/eventListener/v%s",
+ secure ? "https" : "http",
+ fqdn,
+ port,
+ (((path != NULL) && (strlen(path) > 0)) ?
+ strncat(path_url, path, EVEL_MAX_URL_LEN) : ""),
+ version_string);
+
+ /***************************************************************************/
+ /* Build the URL to the event API. */
+ /***************************************************************************/
+ strcpy(topic_url, "/");
+ snprintf(event_api_url,
+ EVEL_MAX_URL_LEN,
+ "%s%s",
+ base_api_url,
+ (((topic != NULL) && (strlen(topic) > 0)) ?
+ strncat(topic_url, topic, EVEL_MAX_URL_LEN) : ""));
+ EVEL_INFO("Vendor Event Listener API is located at: %s", event_api_url);
+
+ /***************************************************************************/
+ /* Build the URL to the throttling API. */
+ /***************************************************************************/
+ snprintf(throt_api_url,
+ EVEL_MAX_URL_LEN,
+ "%s/clientThrottlingState",
+ base_api_url);
+ EVEL_INFO("Vendor Event Throttling API is located at: %s", throt_api_url);
+
+ /***************************************************************************/
+ /* Spin-up the event-handler, which gets cURL readied for use. */
+ /***************************************************************************/
+ rc = event_handler_initialize(event_api_url,
+ throt_api_url,
+ username,
+ password,
+ verbosity);
+ if (rc != EVEL_SUCCESS)
+ {
+ log_error_state("Failed to initialize event handler (including cURL)");
+ goto exit_label;
+ }
+
+ /***************************************************************************/
+ /* Extract the metadata from OpenStack. If we fail to extract it, we */
+ /* record that in the logs, but carry on, assuming we're in a test */
+ /* without a metadata service. */
+ /***************************************************************************/
+ rc = openstack_metadata(verbosity);
+ if (rc != EVEL_SUCCESS)
+ {
+ EVEL_INFO("Failed to load OpenStack metadata - assuming test environment");
+ rc = EVEL_SUCCESS;
+ }
+
+ /***************************************************************************/
+ /* Start the event handler thread. */
+ /***************************************************************************/
+ rc = event_handler_run();
+ if (rc != EVEL_SUCCESS)
+ {
+ log_error_state("Failed to start event handler thread. "
+ "Error code=%d", rc);
+ goto exit_label;
+ }
+
+exit_label:
+ return(rc);
+}
+
+/**************************************************************************//**
+ * Clean up the EVEL library.
+ *
+ * @note that at present don't expect Init/Term cycling not to leak memory!
+ *
+ * @returns Status code
+ * @retval EVEL_SUCCESS On success
+ * @retval "One of ::EVEL_ERR_CODES" On failure.
+ *****************************************************************************/
+EVEL_ERR_CODES evel_terminate(void)
+{
+ int rc = EVEL_SUCCESS;
+
+ /***************************************************************************/
+ /* First terminate any pending transactions in the event-posting thread. */
+ /***************************************************************************/
+ rc = event_handler_terminate();
+ if (rc != EVEL_SUCCESS)
+ {
+ log_error_state("Failed to terminate EVEL library cleanly!");
+ }
+
+ /***************************************************************************/
+ /* Shut down the Event Handler library in a tidy manner. */
+ /***************************************************************************/
+ curl_global_cleanup();
+
+ /***************************************************************************/
+ /* Clean up allocated memory. */
+ /***************************************************************************/
+ free(functional_role);
+
+ /***************************************************************************/
+ /* Clean up event throttling. */
+ /***************************************************************************/
+ evel_throttle_terminate();
+
+ EVEL_INFO("EVEL stopped");
+ return(rc);
+}
+
+/**************************************************************************//**
+ * Free an event.
+ *
+ * Free off the event supplied. Will free all the contained allocated memory.
+ *
+ * @note It is safe to free a NULL pointer.
+ *****************************************************************************/
+void evel_free_event(void * event)
+{
+ EVENT_HEADER * evt_ptr = event;
+ EVEL_ENTER();
+
+ if (event != NULL)
+ {
+ /*************************************************************************/
+ /* Work out what kind of event we're dealing with so we can cast it */
+ /* appropriately. */
+ /*************************************************************************/
+ switch (evt_ptr->event_domain)
+ {
+ case EVEL_DOMAIN_INTERNAL:
+ EVEL_DEBUG("Event is an Internal event at %lp", evt_ptr);
+ evel_free_internal_event((EVENT_INTERNAL *) evt_ptr);
+ memset(evt_ptr, 0, sizeof(EVENT_INTERNAL));
+ free(evt_ptr);
+ break;
+
+ case EVEL_DOMAIN_HEARTBEAT:
+ EVEL_DEBUG("Event is a Heartbeat at %lp", evt_ptr);
+ evel_free_header(evt_ptr);
+ memset(evt_ptr, 0, sizeof(EVENT_HEADER));
+ free(evt_ptr);
+ break;
+
+ case EVEL_DOMAIN_FAULT:
+ EVEL_DEBUG("Event is a Fault at %lp", evt_ptr);
+ evel_free_fault((EVENT_FAULT *)evt_ptr);
+ memset(evt_ptr, 0, sizeof(EVENT_FAULT));
+ free(evt_ptr);
+ break;
+
+ case EVEL_DOMAIN_MEASUREMENT:
+ EVEL_DEBUG("Event is a Measurement at %lp", evt_ptr);
+ evel_free_measurement((EVENT_MEASUREMENT *)evt_ptr);
+ memset(evt_ptr, 0, sizeof(EVENT_MEASUREMENT));
+ free(evt_ptr);
+ break;
+
+ case EVEL_DOMAIN_MOBILE_FLOW:
+ EVEL_DEBUG("Event is a Mobile Flow at %lp", evt_ptr);
+ evel_free_mobile_flow((EVENT_MOBILE_FLOW *)evt_ptr);
+ memset(evt_ptr, 0, sizeof(EVENT_MOBILE_FLOW));
+ free(evt_ptr);
+ break;
+
+ case EVEL_DOMAIN_REPORT:
+ EVEL_DEBUG("Event is a Report at %lp", evt_ptr);
+ evel_free_report((EVENT_REPORT *)evt_ptr);
+ memset(evt_ptr, 0, sizeof(EVENT_REPORT));
+ free(evt_ptr);
+ break;
+
+ case EVEL_DOMAIN_SERVICE:
+ EVEL_DEBUG("Event is a Service Event at %lp", evt_ptr);
+ evel_free_service((EVENT_SERVICE *)evt_ptr);
+ memset(evt_ptr, 0, sizeof(EVENT_SERVICE));
+ free(evt_ptr);
+ break;
+
+ case EVEL_DOMAIN_SIGNALING:
+ EVEL_DEBUG("Event is a Signaling at %lp", evt_ptr);
+ evel_free_signaling((EVENT_SIGNALING *)evt_ptr);
+ memset(evt_ptr, 0, sizeof(EVENT_SIGNALING));
+ free(evt_ptr);
+ break;
+
+ case EVEL_DOMAIN_STATE_CHANGE:
+ EVEL_DEBUG("Event is a State Change at %lp", evt_ptr);
+ evel_free_state_change((EVENT_STATE_CHANGE *)evt_ptr);
+ memset(evt_ptr, 0, sizeof(EVENT_STATE_CHANGE));
+ free(evt_ptr);
+ break;
+
+ case EVEL_DOMAIN_SYSLOG:
+ EVEL_DEBUG("Event is a Syslog at %lp", evt_ptr);
+ evel_free_syslog((EVENT_SYSLOG *)evt_ptr);
+ memset(evt_ptr, 0, sizeof(EVENT_SYSLOG));
+ free(evt_ptr);
+ break;
+
+ case EVEL_DOMAIN_OTHER:
+ EVEL_DEBUG("Event is an Other at %lp", evt_ptr);
+ evel_free_other((EVENT_OTHER *)evt_ptr);
+ memset(evt_ptr, 0, sizeof(EVENT_OTHER));
+ free(evt_ptr);
+ break;
+
+ default:
+ EVEL_ERROR("Unexpected event domain (%d)", evt_ptr->event_domain);
+ assert(0);
+ }
+ }
+ EVEL_EXIT();
+}