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| 1 | <?php |
| 2 | // This file is part of Moodle - https://moodle.org/ |
| 3 | // |
| 4 | // Moodle is free software: you can redistribute it and/or modify |
| 5 | // it under the terms of the GNU General Public License as published by |
| 6 | // the Free Software Foundation, either version 3 of the License, or |
| 7 | // (at your option) any later version. |
| 8 | // |
| 9 | // Moodle is distributed in the hope that it will be useful, |
| 10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | // GNU General Public License for more details. |
| 13 | // |
| 14 | // You should have received a copy of the GNU General Public License |
| 15 | // along with Moodle. If not, see <https://www.gnu.org/licenses/>. |
| 16 | |
| 17 | namespace tool_autoflow\local; |
| 18 | |
| 19 | use tool_autoflow\local\engine\executor; |
| 20 | use tool_autoflow\local\engine\graph; |
| 21 | use tool_autoflow\local\engine\invalid_graph; |
| 22 | use tool_autoflow\task\run_workflow; |
| 23 | |
| 24 | /** |
| 25 | * Queues workflow runs as ad hoc tasks and runs them. |
| 26 | * |
| 27 | * Every run carries a depth. A run started by an event that another run fired is |
| 28 | * one level deeper. Past MAX_DEPTH nothing is queued, so a workflow that triggers |
| 29 | * itself stops instead of looping, while ordinary chains of workflows still work. |
| 30 | * |
| 31 | * @package tool_autoflow |
| 32 | * @copyright 2026 DevLMS <contact@devlms.com> |
| 33 | * @license https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later |
| 34 | */ |
| 35 | final class runner { |
| 36 | /** Deepest allowed chain of runs started by other runs. */ |
| 37 | public const MAX_DEPTH = 3; |
| 38 | |
| 39 | /** @var int|null Depth of the run executing in this process, or null. */ |
| 40 | private static ?int $depth = null; |
| 41 | |
| 42 | /** |
| 43 | * Queue a run. |
| 44 | * |
| 45 | * @param int $workflowid |
| 46 | * @param array $trigger Data about what started it. |
| 47 | * @param string $triggertype manual, schedule or event. |
| 48 | * @param int $depth 0 unless another run caused this one. |
| 49 | * @return bool False when the chain is already too deep. |
| 50 | */ |
| 51 | public static function queue(int $workflowid, array $trigger, string $triggertype, int $depth = 0): bool { |
| 52 | global $DB; |
| 53 | if ($depth > self::MAX_DEPTH) { |
| 54 | return false; |
| 55 | } |
| 56 | $runas = $DB->get_field('tool_autoflow_workflow', 'runasuserid', ['id' => $workflowid]); |
| 57 | $task = new run_workflow(); |
| 58 | $task->set_custom_data(['workflowid' => $workflowid, 'trigger' => $trigger, 'triggertype' => $triggertype, |
| 59 | 'depth' => $depth]); |
| 60 | $task->set_userid($runas ?: get_admin()->id); |
| 61 | \core\task\manager::queue_adhoc_task($task); |
| 62 | return true; |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * Depth of the run executing now, or null when no run is executing. |
| 67 | * |
| 68 | * @return int|null |
| 69 | */ |
| 70 | public static function current_depth(): ?int { |
| 71 | return self::$depth; |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * Run a workflow now and record the result. |
| 76 | * |
| 77 | * @param int $workflowid |
| 78 | * @param array $trigger |
| 79 | * @param string $triggertype |
| 80 | * @param int $depth |
| 81 | * @return \stdClass|null The run record, or null when the workflow is gone or disabled. |
| 82 | */ |
| 83 | public static function run(int $workflowid, array $trigger, string $triggertype, int $depth): ?\stdClass { |
| 84 | global $DB; |
| 85 | $workflow = $DB->get_record('tool_autoflow_workflow', ['id' => $workflowid]); |
| 86 | if (!$workflow || (!$workflow->enabled && $triggertype !== 'manual')) { |
| 87 | return null; |
| 88 | } |
| 89 | $run = (object) [ |
| 90 | 'workflowid' => $workflowid, |
| 91 | 'status' => 'running', |
| 92 | 'triggertype' => $triggertype, |
| 93 | 'userid' => self::trigger_user($trigger), |
| 94 | 'timecreated' => time(), |
| 95 | ]; |
| 96 | $run->id = $DB->insert_record('tool_autoflow_run', $run); |
| 97 | |
| 98 | $previous = self::$depth; |
| 99 | self::$depth = $depth; |
| 100 | try { |
| 101 | $result = (new executor(node_catalogue::registry()))->run(graph::from_json($workflow->graph), $trigger); |
| 102 | $run->status = $result->status; |
| 103 | $run->log = json_encode($result->steps); |
| 104 | $run->error = $result->error; |
| 105 | } catch (invalid_graph $e) { |
| 106 | $run->status = 'failed'; |
| 107 | $run->log = '[]'; |
| 108 | $run->error = $e->getMessage(); |
| 109 | } finally { |
| 110 | self::$depth = $previous; |
| 111 | } |
| 112 | $run->timefinished = time(); |
| 113 | $DB->update_record('tool_autoflow_run', $run); |
| 114 | return $DB->get_record('tool_autoflow_run', ['id' => $run->id]); |
| 115 | } |
| 116 | |
| 117 | /** |
| 118 | * The user a trigger is about, if any. |
| 119 | * |
| 120 | * @param array $trigger |
| 121 | * @return int|null |
| 122 | */ |
| 123 | private static function trigger_user(array $trigger): ?int { |
| 124 | $userid = $trigger['relateduserid'] ?? $trigger['userid'] ?? null; |
| 125 | return $userid ? (int) $userid : null; |
| 126 | } |
| 127 | } |