<?php
/**
 * adminBrokerOut.php
 *
 * This is the admin-out broker and is, currently, a placeholder for future work.
 *
 * This broker is intended to be used to fetch data/reports from the admin-side.  As it stands today, only base
 * events are supported.
 *
 * This broker is pretty old requires refactoring to bring up-to standards.   As it is now, it is simply a placeholder
 * service.
 *
 * @author  mike@givingassistant.org
 * @version  1.0.0
 *
 * HISTORY:
 * ========
 * 06-15-17     mks     original coding
 * 08-24-17     mks     CORE-500: broker events
 * 02-06-18     mks     _INF-139: migration event coding, PHP 7.2 exception handling
 * 05-31-18     mks     CORE-1011: update for new XML broker services configuration
 * 06-07-18     mks     CORE-1013: remote fetch event added
 * 07-09-18     mks     CORE-1017: pedigree fetch event added
 * 07-28-20     mks     DB-156: broker self-registration installed
 *
 */
use  PhpAmqpLib\Connection\AMQPStreamConnection;
use /** @noinspection PhpUnusedAliasInspection */ PhpAmqpLib\Channel\AMQPChannel;
use  PhpAmqpLib\Message\AMQPMessage;
use /** @noinspection PhpUnusedAliasInspection */ PhpAmqpLib\Exception\AMQPTimeoutException;

pcntl_async_signals(true);                                      // enable asynchronous signal handling (PHP 7.1)
$myPid = getmypid();
$_REDIRECT = true;
$topDir = dirname(__DIR__);
$thisWatcher = basename(__FILE__);
$thisWatcher = rtrim($thisWatcher, ".php");

// load the framework
@require_once($topDir . '/config/sneakerstrap.inc');                  // can't be constants b/c this loads the constants

$childrenPidList = null;
$pidDir = $topDir . DIR_PIDS;
$eos = (isset($_SERVER['HTTP_USER_AGENT'])) ? '<br />' : PHP_EOL;
$res = 'ADMO: ';
// event management for children
$adminServiceConfig = gasConfig::$settings[CONFIG_BROKER_SERVICES][CONFIG_ADMIN];
$numberChildren = $adminServiceConfig[CONFIG_BROKER_INSTANCES][CONFIG_ADMIN_BROKER_OUT];
$requestsPerInstance = (empty($adminServiceConfig[CONFIG_BROKER_REQUEST_LIMIT])) ? NUMBER_C : $adminServiceConfig[CONFIG_BROKER_REQUEST_LIMIT];
$numberChildren = ($numberChildren < 1) ? 1 : $numberChildren;  // todo -- should this be = 2??
$runningBrokers = $numberChildren;
$requestCounter = 0;
$myRequestsPerInstance = 0;
$startingMemory = 0;
// create the root guid
$groot = rtrim($res, COLON) . UDASH . guid();                 // root guid
consoleLog($res, CON_SUCCESS, sprintf(INFO_BROKER_STARTUP, substr(basename(__FILE__), 0, -4), $groot));

/** @var gacErrorLogger $parentLog */
$parentLog = new gacErrorLogger();
$errors = null;
$file = rtrim(basename(__FILE__), DOT . FILE_TYPE_PHP);
$service = ENV_ADMIN;

if (!validateService($service, $errors)) {
    $hdr = sprintf(INFO_LOC, $file, __LINE__);
    $msg = sprintf(ERROR_SERVICE_REG, $file, $service);
    $parentLog->fatal($hdr . $msg);
    $parentLog->__destruct();
    unset($parentLog);
    exit(1);
}

//////////////////////////////////////////////////////////////////////////////////
// set-up the replacement signal handler that will be called on a child's death //
//////////////////////////////////////////////////////////////////////////////////
//declare( ticks = 1);
function sigHandler($_sig) {
    global $numberChildren;
    switch ($_sig) {
        case SIGCHLD :
            $numberChildren--;
            while (($pid = pcntl_wait($_sig, WNOHANG)) > 0) {
                @pcntl_wexitstatus($_sig);
            }
            break;
    }
}
pcntl_signal(SIGCLD, 'sigHandler');

/////////////////////////////////////////////////////////////////////////////////////////
// set-up the forking function so that it can be called initially or on a SIGCLD event //
/////////////////////////////////////////////////////////////////////////////////////////
function forkMe()
{
    global $thisWatcher, $eos, $res, $parentLog, $requestsPerInstance, $myRequestsPerInstance, $groot;
//    $startingMemory = memory_get_usage(true);
    // todo -- when this broker becomes active, add the systemEvent for calculating memory consumption on SIGCLD
    $myRequestsPerInstance = $requestsPerInstance + (mt_rand(0, 2) * 10) + mt_rand(1, 9);
    $thisPid = pcntl_fork();

    switch ($thisPid) {
        case -1 :   // error
            $cmsg = ERROR_FORK_FAILED . $thisWatcher;
            $parentLog->fatal($cmsg);
            die(getDateTime() . CON_ERROR . $res . $cmsg . $eos);
            break;
        case 0 :    // child (broker daemon)
            try {
                // replace the sigcld signal handler
                pcntl_signal(SIGCLD, SIG_DFL);
                $thisPid = getmypid();

                // create the child logger object
                /** @var gacErrorLogger $childLog */
                $childLog = new gacErrorLogger();

                // generate a child guid for the forked child...
                $childGUID = rtrim($res, COLON) . UDASH . guid();

                // toss the childGUID unto cache because it does not propagate down to the callback method
                gasCache::sysAdd(($groot . UDASH . $thisPid), $childGUID);

                $queueTag = gasConfig::$settings[CONFIG_BROKER_SERVICES][CONFIG_BROKER_QUEUE_TAG];
                $queue = $queueTag . BROKER_QUEUE_AO;

                /** @var AMQPStreamConnection $brokerConnection */
                $brokerConnection = gasResourceManager::fetchResource(RESOURCE_ADMIN);
                if (is_null($brokerConnection)) {
                    $parentLog->fatal(ERROR_RESOURCE_404 . RESOURCE_ADMIN);
                    consoleLog($res, CON_ERROR, ERROR_RESOURCE_404 . RESOURCE_ADMIN);
                    exit(1);                                                    // shell-script exit value for fail
                }
                $brokerChannel = $brokerConnection->channel();
                // params:  queue name, passive, durable, exclusive, auto-delete
                $brokerChannel->queue_declare($queue, BROKER_QUEUE_DECLARE_PASSIVE, false, false, true);
            } catch (PhpAmqpLib\Exception\AMQPRuntimeException | Throwable | TypeError $t) {
                $hdr = basename(__FILE__) . AT . __LINE__ . COLON;
                @handleExceptionMessaging($hdr, $t->getMessage(), $foo, true);
                exit(1);
            }

            // register the child-spawn event
            $data = [
                SYSTEM_EVENT_NAME => SYSEV_NAME_CHILD_REG,
                SYSTEM_EVENT_TYPE => SYSEV_TYPE_BROKER,
                SYSTEM_EVENT_BROKER_ROOT_GUID => $groot,
                SYSTEM_EVENT_BROKER_GUID => $childGUID,
                SYSTEM_EVENT_KEY => SYSEV_CHILD_RPI,
                SYSTEM_EVENT_VAL => $myRequestsPerInstance,
                SYSTEM_EVENT_CODE_LOC => basename(__FILE__) . COLON . __LINE__
            ];
            @postSystemEvent($data, $childGUID, $childLog);

            register_shutdown_function(BROKER_SHUTDOWN_FUNCTION, $brokerChannel, $brokerConnection, $res);
            $callback = function($_request)
            {
                $startTime = gasStatic::doingTime();
                global $requestCounter, $res, $eos, $myRequestsPerInstance, $startingMemory, $groot, $service;
                $errorList = array();
                $requestCounter++;
                $aryRetData = null;
                $retData = null;
                $request = null;
                $eos = (isset($_SERVER['HTTP_USER_AGENT'])) ? '<br />' : PHP_EOL;
                $eventSuccess = false;
                $conMsg = '';
                $eventGUID = guid();
                $thisPid = getmypid();
                $eventTimer = false;   // certain events will toggle to true to log timer recording for the broker event
                $childGUID = gasCache::sysGet(($groot . UDASH . getmypid()));

                // set-up the call-back logger
                /** @var gacErrorLogger $callBackLog */
                $callBackLog = new gacErrorLogger($eventGUID);
                if (!firstPassPayloadValidation($_request, $service, $msg, $request, $eventGUID)) {
                    $conMsg = $msg;
                    $callBackLog->info($msg);
                    $aryRetData = buildReturnPayload([false, STATE_FAIL, null, $msg, null]);
                    $event = BROKER_QUEUE_AO . '(' . ERROR_DATA_VALIDATION_FIRST_PASS . ')';
                } elseif (!validateMetaData($request, $errorList)) {
                    for ($index = 0, $last = count($errorList); $index < $last; $index++) {
                        $conMsg .= $errorList[$index] . $eos;
                        $callBackLog->error($errorList[$index]);
                    }
                    $conMsg = rtrim($conMsg, $eos);
                    $aryRetData = buildReturnPayload([false, STATE_META_ERROR, $msg, null, null]);
                    $event = BROKER_QUEUE_AO . '(' . ERROR_META_VALIDATION_SECOND_PASS . ')';
                } else {
                    $event = BROKER_QUEUE_AO . '(' . $request[BROKER_REQUEST] . ')';
                    if (is_null($request)) consoleLog($res, CON_ERROR, ERROR_BROKER_REQUEST_BAD . BROKER_REQUEST);

                    switch ($request[BROKER_REQUEST]) {
                        case BROKER_REQUEST_SHUTDOWN :
                            $_request->delivery_info[BROKER_CHANNEL]->basic_cancel($_request->delivery_info[BROKER_DELIVERY_TAG]);
                            $conMsg = SUCCESS_SHUTDOWN;
                            $aryRetData = buildReturnPayload([true, STATE_SUCCESS, null, BROKER_REQUEST_SHUTDOWN, null]);
                            $eventSuccess = true;
                        break;

                        // test broker responsiveness
                        case BROKER_REQUEST_PING :
                            $conMsg = SUCCESS_PING . BROKER_QUEUE_AO;
                            $aryRetData = buildReturnPayload([true, STATE_SUCCESS, null, (SUCCESS_PING . BROKER_QUEUE_AO), null]);
                            $eventSuccess = true;
                        break;

                        case BROKER_REQUEST_PEDIGREE :
                            $conMsg = SUCCESS_EVENT . BROKER_REQUEST_PEDIGREE;
                            $aryRetData = buildReturnPayload([true, STATE_SUCCESS, null, gasConfig::getPedigree()]);
                            $eventSuccess = true;
                        break;

                        case BROKER_REQUEST_ADMIN_MWH_EVENT_CREATE :
                            $eventTimer = true;
                            $errors = array();
                            if (!isset($request[BROKER_META_DATA][META_CLIENT])) {
                                $msg = ERROR_META_CLIENT_404;
                                $conMsg = $msg;
                                $callBackLog->data($msg);
                            } elseif ($request[BROKER_META_DATA][META_CLIENT] != CLIENT_SYSTEM) {
                                $msg = ERROR_BROKER_CLIENT_NOT_AUTH . COLON . $request[BROKER_META_DATA][META_CLIENT];
                                $conMsg = $msg;
                                $callBackLog->data($msg);
                            } elseif ($request[BROKER_META_DATA][META_TEMPLATE] != TEMPLATE_CLASS_MIGRATIONS
                                  and $request[BROKER_META_DATA][META_TEMPLATE] != TEMPLATE_CLASS_WAREHOUSE) {
                                $msg = ERROR_TEMPLATE_WRONG;
                                $conMsg = $msg;
                                $callBackLog->error($msg);
                            } else {
                                /** @var gacMongoDB $widget */
                                if (is_null($widget = grabWidget($request[BROKER_META_DATA], '', $errorList))) {
                                    foreach ($errorList as $error)
                                        $callBackLog->error($error);
                                } else {
                                    $widget->_createRecord($request[BROKER_DATA]);
                                    if (!$widget->status) {
                                        $msg = FAIL_EVENT . BROKER_REQUEST_ADMIN_MWH_EVENT_CREATE;
                                        $conMsg = $msg;
                                        $callBackLog->error($msg);
                                        $aryRetData = buildReturnPayload([false, $widget->state, $widget->eventMessages, null]);
                                    } else {
                                        $eventSuccess = true;
                                        $conMsg = SUCCESS_EVENT . BROKER_REQUEST_ADMIN_MWH_EVENT_CREATE;
                                        $aryRetData = buildReturnPayload([true, $widget->state, $widget->eventMessages, $widget->getData()]);
                                    }
                                    if (is_object($widget)) $widget->__destruct();
                                    unset($widget);
                                }
                            }
                        break;

                        case BROKER_REQUEST_ADMIN_MWH_EVENT_FETCH :
                            $eventTimer = true;
//                            try {             // if debugging, turn on the exception trapper
                            $errors = [];
                            if (empty($request[BROKER_DATA]) or !is_array($request[BROKER_DATA])) {
                                $msg = ERROR_DATA_MISSING_ARRAY . BROKER_DATA;
                                $conMsg = $msg;
                                $aryRetData = buildReturnPayload([false, STATE_DATA_ERROR, $msg]);
                            } elseif (!array_key_exists(META_TEMPLATE, $request[BROKER_META_DATA])
                                or ($request[BROKER_META_DATA][META_TEMPLATE] != TEMPLATE_CLASS_MIGRATIONS
                                and $request[BROKER_META_DATA][META_TEMPLATE] != TEMPLATE_CLASS_WAREHOUSE)) {
                                $msg = sprintf(ERROR_TEMPLATE_BAD, TEMPLATE_CLASS_MIGRATIONS);
                                $conMsg = $msg;
                                $aryRetData = buildReturnPayload([false, STATE_META_ERROR, $msg, null]);
                            } else {
                                /** @var gacMongoDB $widget */
                                if (is_null($widget = grabWidget($request[BROKER_META_DATA], '', $errorList))) {
                                    foreach ($errorList as $error)
                                        $callBackLog->error($error);
                                } else {
                                    $widget->_fetchRecords($request[BROKER_DATA]);
                                    if (!$widget->status) {
                                        // fetch failed
                                        $conMsg = FAIL_EVENT . BROKER_REQUEST_ADMIN_MWH_EVENT_FETCH;
                                        $aryRetData = buildReturnPayload([false, $widget->state, $widget->eventMessages, null]);
                                    } else {
                                        // update successful
                                        $eventSuccess = true;
                                        $conMsg = SUCCESS_EVENT . BROKER_REQUEST_ADMIN_MWH_EVENT_FETCH;
                                        // ReturnPayload - a query that returns no data will show success - eval the return
                                        //                 state and return either a "no data found" message or the query
                                        //                 results to the calling client
                                        $rp = ($widget->state == STATE_NOT_FOUND) ? $widget->eventMessages : $widget->queryResults;
                                        $aryRetData = buildReturnPayload([true, $widget->state, $rp, $widget->getData()]);
                                    }
                                    if (is_object($widget)) $widget->__destruct();
                                    unset($widget);
                                }
                            }
//                            } catch (Throwable | TypeError $t) {
//                                $eLine = $t->getLine();
//                                $eFile = $t->getFile();
//                                $eMsg = $t->getMessage();
//                                $msg = $eFile . COLON_NS . $eLine . COLON . $eMsg;
//                                consoleLog($res, CON_ERROR, $msg);
//                                $conMsg = $hdrConE . FAIL_EVENT . BROKER_REQUEST_ADMIN_MIGRATE_FETCH_EVENT;
//                                $aryRetData = buildReturnPayload([false, STATE_FAIL, $eMsg, null]);
//                            }
                        break;

                        case BROKER_REQUEST_REMOTE_FETCH :
                            $eventTimer = true;
                            $errors = array();
                            /** @var gacMongoDB $widget */
                            if (is_null($widget = grabWidget($request[BROKER_META_DATA], '', $errorList))) {
                                foreach ($errorList as $error)
                                    $callBackLog->error($error);
                            } else {
                                $widget->_fetchRecords($request[BROKER_DATA]);
                                if ($widget->status) {
                                    $eventSuccess = true;
                                    $widget->eventMessages[] = STRING_REC_COUNT_RET . $widget->recordsReturned;
                                    $conMsg = SUCCESS_EVENT . BROKER_REQUEST_FETCH;
                                    $queryMeta = [
                                        STRING_REC_COUNT_RET => $widget->recordsReturned,
                                        STRING_REC_COUNT_TOT => $widget->recordsInCollection
                                    ];
                                    // recordsInQuery is a PDO thing so let's see if it exists in the class object
                                    if (isset($widget->recordsInQuery) and $widget->recordsInQuery) {
                                        $queryMeta[STRING_REC_COUNT_QUERY] = $widget->recordsInQuery;
                                    }
                                    if (isset($request[BROKER_META_DATA][META_DONUT_FILTER]) and $request[BROKER_META_DATA][META_DONUT_FILTER] == 1) {
                                        $queryResults = $widget->getData();
                                    } elseif ($widget->useCache or (isset($request[BROKER_META_DATA][META_DO_CACHE]) and $request[BROKER_META_DATA][META_DO_CACHE])) {
                                        $queryResults = $widget->getCK();
                                    } else {
                                        $queryResults = $widget->getData();
                                    }
                                    $retData = [STRING_QUERY_RESULTS => $queryResults, STRING_QUERY_DATA => $queryMeta];
                                    $aryRetData = buildReturnPayload([true, STATE_SUCCESS, $widget->eventMessages, $retData]);
                                } else {
                                    $conMsg = FAIL_EVENT . BROKER_REQUEST_FETCH;
                                    $aryRetData = buildReturnPayload([false, $widget->state, $widget->eventMessages, null]);
                                }
                                if (is_object($widget)) $widget->__destruct();
                                unset($widget);
                            }
                        break;

                        case BROKER_REQUEST_AUDIT_RESTORE :
                            $eventTimer = true;
                            $errors = [];
                            if (!isset($request[BROKER_DATA]) or empty($request[BROKER_DATA])) {
                                $msg = ERROR_DATA_MISSING_ARRAY . STRING_DATA;
                                $conMsg = $msg;
                                $callBackLog->data($msg);
                                $errors[] = $msg;
                            } elseif (!is_array($request[BROKER_DATA])) {
                                $msg = ERROR_DATA_ARRAY_NOT_ARRAY . STRING_DATA;
                                $conMsg = $msg;
                                $callBackLog->data($msg);
                                $errors[] = $msg;
                            } elseif (!isset($request[BROKER_DATA][STRING_KEY])) {
                                $msg = ERROR_ARRAY_KEY_404 . BROKER_DATA . COLON . STRING_KEY;
                                $conMsg = $msg;
                                $callBackLog->data($msg);
                                $errors[] = $msg;
                            } else {
                                $key = $request[BROKER_DATA][STRING_KEY];
                                if (!validateGUID($key)) {
                                    $msg = ERROR_INVALID_GUID . $key;
                                    $conMsg = $msg;
                                    $callBackLog->data($msg);
                                    $errors[] = $msg;
                                } else {
                                    // inject a key into the metaPayload to flag all requests as audit requests
                                    $request[BROKER_META_DATA][META_AUDIT_EVENT] = 1;
                                    /** @var gacMongoDB $widget */
                                    if (is_null($widget = grabWidget($request[BROKER_META_DATA], $key, $errorList))) {
                                        foreach ($errorList as $error)
                                            $callBackLog->error($error);
                                    } else {
                                        try {
                                            $data = [];     // for the return payload containing original and changed records
                                            $rc = $widget->restoreAuditRecord($data);
                                            switch ($rc) {
                                                case true :
                                                    $eventSuccess = true;
                                                    $aryRetData = buildReturnPayload([true, STATE_SUCCESS, $widget->eventMessages, SUCCESS_DB_RECORD_RESTORED]);
                                                    $conMsg = SUCCESS_EVENT . BROKER_REQUEST_AUDIT_RESTORE;
                                                break;
                                                case false :
                                                default    :
                                                    if (!empty($errors)) $widget->eventMessages = array_merge($widget->eventMessages, $errors);
                                                    $conMsg = FAIL_EVENT . BROKER_REQUEST_AUDIT_RESTORE;
                                                    $aryRetData = buildReturnPayload([false, STATE_FAIL, $widget->eventMessages, null]);
                                                break;
                                            }
                                        } catch (TypeError | Throwable $t) {
                                            $msg = ERROR_TYPE_EXCEPTION . $t->getMessage();
                                            $conMsg = $msg;
                                            $callBackLog->error($msg);
                                        }
                                        if (is_object($widget)) $widget->__destruct();
                                        unset($widget);
                                    }
                                }
                            }
                        break;

                        case BROKER_REQUEST_ADMIN_MWH_EVENT_UPDATE :
                            $eventTimer = true;
                            $errors = array();
                            if (!isset($request[BROKER_DATA]) or empty($request[BROKER_DATA])) {
                                $msg = ERROR_DATA_MISSING_ARRAY . STRING_DATA;
                                $conMsg = $msg;
                                $callBackLog->data($msg);
                            } elseif (!isset($request[BROKER_META_DATA][META_CLIENT])) {
                                $msg = ERROR_META_CLIENT_404;
                                $conMsg = $msg;
                                $callBackLog->data($msg);
                            } elseif ($request[BROKER_META_DATA][META_CLIENT] != CLIENT_SYSTEM) {
                                $msg = ERROR_BROKER_CLIENT_NOT_AUTH . COLON . $request[BROKER_META_DATA][META_CLIENT];
                                $conMsg = $msg;
                                $callBackLog->data($msg);
                            } elseif ($request[BROKER_META_DATA][META_TEMPLATE] != TEMPLATE_CLASS_MIGRATIONS
                                and $request[BROKER_META_DATA][META_TEMPLATE] != TEMPLATE_CLASS_WAREHOUSE) {
                                $msg = ERROR_TEMPLATE_WRONG;
                                $conMsg = $msg;
                                $callBackLog->error($msg);
                            } else {
                                /** @var gacMongoDB $widget */
                                if (is_null($widget = grabWidget($request[BROKER_META_DATA], '', $errorList))) {
                                    foreach ($errorList as $error)
                                        $callBackLog->error($error);
                                } else {
                                    $widget->_updateRecord($request[BROKER_DATA]);
                                    if (!$widget->status) {
                                        $msg = FAIL_EVENT . BROKER_REQUEST_ADMIN_MWH_EVENT_UPDATE;
                                        $conMsg = $msg;
                                        $callBackLog->error($msg);
                                        $aryRetData = buildReturnPayload([false, $widget->state, $widget->eventMessages, null]);
                                    } else {
                                        $eventSuccess = true;
                                        $conMsg = SUCCESS_EVENT . BROKER_REQUEST_ADMIN_MWH_EVENT_UPDATE;
                                        $aryRetData = buildReturnPayload([true, $widget->state, $widget->eventMessages, $widget->getData()]);
                                    }
                                    if (is_object($widget)) $widget->__destruct();
                                    unset($widget);
                                }
                            }
                        break;
                    }
                    unset($aryRetData[PAYLOAD_CM]);
                }
                // ensure we have a return-payload and a console message
                if (empty($aryRetData)) {
                    $msg = ERROR_NO_RET_DATA . '-' . __FILE__ . '-' . $request[BROKER_REQUEST];
                    $conMsg = BROKER_QUEUE_AO . ' - ' . $msg;
                    $errorList = (empty($errors)) ? null : $errors;
                    $aryRetData = buildReturnPayload([false, STATE_FRAMEWORK_FAIL, $msg, $errorList]);
                } elseif ($eventSuccess and empty($conMsg)) {
                    $callBackLog->warn(ERROR_NO_CON_MSG);
                    $conMsg = $request[BROKER_REQUEST] . ' - ' . STATE_SUCCESS;
                }
                // prepare the return payload...
                /** @noinspection PhpUndefinedMethodInspection */
                $msg = new AMQPMessage(gzcompress(json_encode($aryRetData)), array(BROKER_CORRELATION_ID => $_request->get(BROKER_CORRELATION_ID)));
                try {
                    /** @noinspection PhpUndefinedMethodInspection */
                    $_request->delivery_info[BROKER_CHANNEL]->basic_publish($msg, '', $_request->get(BROKER_REPLY_TO));
                } catch (PhpAmqpLib\Exception\AMQPTimeoutException |
                         PhpAmqpLib\Exception\AMQPRuntimeException |
                         Throwable $e) {
                    $logMsg = ERROR_BROKER_EXCEPTION . $e->getMessage();
                    $callBackLog->fatal($logMsg);
                    consoleLog($res, CON_ERROR, $logMsg);
                }

                // if the event processing failed, reject the message, otherwise ack removing it from the queue
                if (!$eventSuccess) {
                    $_request->delivery_info[BROKER_CHANNEL]->basic_reject($_request->delivery_info[BROKER_DELIVERY_TAG], false);
                } else {
                    $_request->delivery_info[BROKER_CHANNEL]->basic_ack($_request->delivery_info[BROKER_DELIVERY_TAG]);
                }
                unset($msg);
                if (!empty($conMsg)) {
                    consoleLog($res, (($eventSuccess) ? CON_SUCCESS : CON_ERROR), $conMsg . sprintf(ERROR_EVENT_COUNT, $requestCounter, $myRequestsPerInstance));
                }

                // publish event metrics if we've toggled the switch on
                if ($eventTimer) {
                    // get the broker-event processing time
                    $eventTime = gasStatic::doingTime($startTime);
                    $data = [
                        SYSTEM_EVENT_NAME => SYSEV_NAME_EVENT_TIMER,
                        SYSTEM_EVENT_TYPE => SYSEV_TYPE_BROKER,
                        SYSTEM_EVENT_BROKER_ROOT_GUID => $groot,
                        SYSTEM_EVENT_BROKER_GUID => $childGUID,
                        DB_EVENT_GUID => $eventGUID,
                        SYSTEM_EVENT_COUNT => $requestCounter,
                        SYSTEM_EVENT_COUNT_TOTAL => $myRequestsPerInstance,
                        SYSTEM_EVENT_TIMER => $eventTime,
                        SYSTEM_EVENT_BROKER_EVENT => $event,
                        SYSTEM_EVENT_META_DATA => $request[BROKER_META_DATA],
                        SYSTEM_EVENT_CODE_LOC => basename(__FILE__) . COLON . __LINE__
                    ];
                    if (!empty($childGUID)) $data[SYSTEM_EVENT_OGUID] = $childGUID;
                    @postSystemEvent($data, $childGUID, $callBackLog);
                }

                // exit the child if we've reached the request limit
                if ($requestCounter >= $myRequestsPerInstance) {
                    if (getmypid() == $thisPid) {
                        $meta = [
                            META_SESSION_IP => STRING_SESSION_HOME,
                            META_SESSION_DAEMON => 1,
                            META_SESSION_MISC => INFO_BROKER_RECYCLE,
                            META_EVENT_GUID => $eventGUID
                        ];
                        $data = [
                            SYSTEM_EVENT_NAME => SYSEV_NAME_BROKER_RECYCLE,
                            SYSTEM_EVENT_TYPE => SYSEV_TYPE_BROKER,
                            SYSTEM_EVENT_BROKER_ROOT_GUID => $groot,
                            SYSTEM_EVENT_BROKER_GUID => $childGUID,
                            DB_EVENT_GUID => $eventGUID,
                            SYSTEM_EVENT_START => $startingMemory,
                            SYSTEM_EVENT_PEAK => memory_get_peak_usage(true),
                            SYSTEM_EVENT_END => memory_get_usage(true),
                            SYSTEM_EVENT_BROKER_EVENT => $event,
                            SYSTEM_EVENT_COUNT => $requestCounter,
                            SYSTEM_EVENT_COUNT_TOTAL => $myRequestsPerInstance,
                            SYSTEM_EVENT_META_DATA => $meta,
                            SYSTEM_EVENT_CODE_LOC => basename(__FILE__) . COLON . __LINE__
                        ];
                        @postSystemEvent($data, $eventGUID, $callBackLog);
                    }
                    consoleLog($res, CON_SYSTEM, INFO_BROKER_REQ_COUNT);
                    exit(0);
                }
            };
            consoleLog($res, CON_SYSTEM, sprintf(INFO_BROKER_QUEUE_ESTABLISHED, BROKER_QUEUE_AO, $thisPid, $myRequestsPerInstance));
            $brokerChannel->basic_qos(null, 1, null);
            $brokerChannel->basic_consume($queue, '', false, false, false, false, $callback);
            while (count($brokerChannel->callbacks)) {
                try {
                    $brokerChannel->wait();
                } catch (Throwable $t) {
                    $hdr = basename(__FILE__) . AT . __LINE__ . COLON;
                    @handleExceptionMessaging($hdr, $t->getMessage(), $foo, true);
                }
            }
            break;

        case 1 :    // parent
                    // does nothing
            break;
    }
    return($thisPid);
}

for ($numBrokers = 0; $numBrokers < $runningBrokers; $numBrokers++) {
    $childrenPidList[] = forkMe();
}
consoleLog($res, CON_SUCCESS, sprintf(INFO_BROKER_PARENT_STARTED, count($childrenPidList), BROKER_QUEUE_AO));

// "register" the broker instantiation event
$data = [
    SYSTEM_EVENT_NAME => SYSEV_NAME_GROOT_REG,
    SYSTEM_EVENT_TYPE => SYSEV_TYPE_BROKER,
    SYSTEM_EVENT_BROKER_ROOT_GUID => $groot,
    SYSTEM_EVENT_KEY => STRING_NUMBER_CHILDREN,
    SYSTEM_EVENT_VAL => $numberChildren,
    SYSTEM_EVENT_CODE_LOC => basename(__FILE__) . COLON . __LINE__,
    SYSTEM_EVENT_NOTES => BROKER_SYSEV_REG . rtrim($res, ": ")
];
@postSystemEvent($data, $groot, $parentLog);

// the parent process continues to run, waking-up every second to monitor it's children...
// when a child dies, it's death-rattle is caught and the child is replaced with a new process.
while (count($childrenPidList)) {
    $lastPid = 0;
    $newPidList = null;
    $result = pcntl_waitpid(0, $status);        // detect any sigchld from the parent-group
    if (in_array($result, $childrenPidList)) {
        $key = array_search($result, $childrenPidList);
        array_splice($childrenPidList, $key, 1);
        // process has already exited -- restart it
        $childrenPidList[] = forkMe();
    }
}