WIP

package.json

@@ -1,14 +1,17 @@
 {
-  "name": "scraping-server",
+  "name": "srap",
   "version": "1.0.0",
   "main": "index.js",
-  "repository": "git@git.cryto.net:joepie91/scraping-server.git",
+  "repository": "git@git.cryto.net:joepie91/srap.git",
   "author": "Sven Slootweg <admin@cryto.net>",
   "license": "WTFPL OR CC0-1.0",
   "dependencies": {
     "@promistream/buffer": "^0.1.1",
     "@promistream/map": "^0.1.1",
+    "@promistream/map-filter": "^0.1.0",
+    "@promistream/parallelize": "^0.1.0",
     "@promistream/pipe": "^0.1.2",
+    "@promistream/rate-limit": "^1.0.1",
     "@promistream/simple-sink": "^0.1.1",
     "@promistream/simple-source": "^0.1.3",
     "@validatem/any-property": "^0.1.3",

src/dependency-map.js

@@ -0,0 +1,48 @@
+"use strict";
+
+const defaultValue = require("default-value");
+const mapObj = require("map-obj");
+
+module.exports = function createDependencyMap(configuration) {
+	let dependencyMap = mapObj(configuration.tasks, (task, definition) => {
+		return [
+			task,
+			defaultValue(definition.dependsOn, []).map((dependencyName) => {
+				let dependency = configuration.tasks[dependencyName];
+
+				if (dependency != null) {
+					return {
+						task: dependencyName,
+						// TODO: Do defaults processing in configuration loading/validation instead
+						taskVersion: defaultValue(dependency.version, "0")
+					};
+				} else {
+					throw new Error(`Invalid dependency specified, task does not exist: ${dependencyName}`);
+				}
+			})
+		];
+	});
+
+	// NOTE: When inverting the dependencyMap, we totally ignore the taskVersion of dependencies when keying this mapping. While the taskVersion of specific tasks *may* matter to the code that uses these mappings, we don't support more than one version of a task simultaneously existing, and so keying by the task name alone is sufficient.
+	let dependentMap = {};
+
+	for (let [ task, dependencies ] of Object.entries(dependencyMap)) {
+		let taskDefinition = configuration.tasks[task];
+
+		for (let dependency of dependencies) {
+			if (dependentMap[dependency.task] == null) {
+				dependentMap[dependency.task] = [];
+			}
+
+			dependentMap[dependency.task].push({
+				task: task,
+				taskVersion: defaultValue(taskDefinition.version, "0")
+			});
+		}
+	}
+
+	return {
+		dependencyMap,
+		dependentMap
+	};
+};

src/kernel.js

@@ -6,13 +6,16 @@ const chalk = require("chalk");
 const util = require("util");
 const syncpipe = require("syncpipe");
 
-const rateLimit = require("@ppstreams/rate-limit");
+const rateLimit = require("@promistream/rate-limit");
 const simpleSink = require("@promistream/simple-sink");
 const pipe = require("@promistream/pipe");
-const parallelize = require("@ppstreams/parallelize");
+const parallelize = require("@promistream/parallelize");
 
 const initialize = require("./initialize");
 const logStatus = require("./log-status");
+const createDependencyMap = require("./dependency-map");
+
+// FIXME: *Require* a taskInterval to be set, even if explicitly null, to prevent accidentally forgetting it
 
 // TODO: Publish this as a separate package
 // Inverts an object of arrays, eg. {a: [x, y], b: [x, z]} becomes {x: [a, b], y: [a], z: [b]}
@@ -33,11 +36,6 @@ function invertMapping(object) {
 	return newObject;
 }
 
-function log(value) {
-	console.log(value);
-	return value;
-}
-
 module.exports = function createKernel(configuration) {
 	return Promise.try(() => {
 		return initialize({
@@ -51,6 +49,7 @@ module.exports = function createKernel(configuration) {
 		const createTaskStream = require("./task-stream")(state);
 
 		let { knex } = state;
+		let { dependencyMap, dependentMap } = createDependencyMap(configuration);
 	
 		function insertSeeds() {
 			return Promise.map(configuration.seed, (item) => {
@@ -89,6 +88,8 @@ module.exports = function createKernel(configuration) {
 						task: task,
 						tags: tags,
 						taskVersion: defaultValue(taskConfiguration.version, "0"),
+						taskInterval: taskConfiguration.taskInterval,
+						parallelTasks: taskConfiguration.parallelTasks,
 						ttl: taskConfiguration.ttl,
 						run: taskConfiguration.run,
 						globalRateLimiter: (attachToGlobalRateLimit != null)
@@ -97,12 +98,8 @@ module.exports = function createKernel(configuration) {
 						globalParallelize: (configuration.parallelTasks != null)
 							? parallelize(configuration.parallelTasks)
 							: null,
-						taskDependencies: defaultValue(taskConfiguration.dependsOn, []).map((task) => {
+						taskDependencies: dependencyMap[task],
-							return {
+						taskDependents: dependentMap[task]
-								task: task,
-								taskVersion: defaultValue(configuration.tasks[task].taskVersion, "0")
-							};
-						})
 					});
 
 					return pipe([

src/mutation-api/database.js

@@ -21,6 +21,7 @@ module.exports = function (state) {
 				return queries.renameItem(tx, options);
 			},
 			mergeItem: function (options) {
+				// FIXME: Move default
 				return queries.mergeItem(tx, {
 					...options,
 					from: defaultValue(options.from, item.id)
@@ -28,10 +29,11 @@ module.exports = function (state) {
 			},
 			deleteItem: function (options) {
 				return queries.deleteItem(tx, {
-					id: defaultValue(options.id, item.id)
+					id: options.id
 				});
 			},
 			createAlias: function (options) {
+				// FIXME: Move default
 				return queries.createAlias(tx, {
 					...options,
 					to: defaultValue(options.to, item.id)

src/mutation-api/wrapper.js

@@ -1,17 +1,21 @@
 "use strict";
 
+const Promise = require("bluebird");
+
 const wrapValueAsOption = require("@validatem/wrap-value-as-option");
 const required = require("@validatem/required");
 const isString = require("@validatem/is-string");
 const defaultTo = require("@validatem/default-to");
 const validateOptions = require("@validatem/core/src/api/validate-options");
 const isFunction = require("@validatem/is-function");
+const arrayOf = require("@validatem/array-of");
 
 // FIXME: Remaining validators
 
-module.exports = function wrapMutationAPI({ item, task }, api) {
+module.exports = function wrapMutationAPI({ item, task, taskDependents }, api) {
 	return {
 		createItem: function (options) {
+			// FIXME: Require tags to be set, even if to an empty array, to avoid accidentally forgetting the tags
 			return api.createItem(options);
 		},
 		renameItem: function (_options) {
@@ -27,7 +31,14 @@ module.exports = function wrapMutationAPI({ item, task }, api) {
 		mergeItem: function (options) {
 			return api.mergeItem(options);
 		},
-		deleteItem: function (options = {}) {
+		deleteItem: function (_options) {
+			let options = validateOptions(arguments, [
+				defaultTo({}),
+				wrapValueAsOption("id"), {
+					id: [ defaultTo(item.id), isString ]
+				}
+			]);
+
 			return api.deleteItem(options);
 		},
 		createAlias: function (options) {
@@ -68,6 +79,30 @@ module.exports = function wrapMutationAPI({ item, task }, api) {
 			]);
 
 			return api.expire(options);
+		},
+		expireDependents: function (_options) {
+			let options = validateOptions(arguments, [
+				defaultTo({}),
+				wrapValueAsOption("dependents"), {
+					id: [ defaultTo(item.id), isString ],
+					dependents: [ arrayOf(isString) ]
+				}
+			]);
+
+			let selectedDependents = (options.dependents != null)
+				? new Set(options.dependents)
+				: null;
+
+			let affectedDependents = (selectedDependents != null)
+				? taskDependents.filter((dependent) => selectedDependents.has(dependent.task))
+				: taskDependents;
+
+			return Promise.map(affectedDependents, (dependent) => {
+				return this.expire({
+					id: options.id,
+					taskName: dependent.task
+				});
+			});
 		}
 	};
 };

src/queries.js

@@ -355,10 +355,13 @@ module.exports = function ({ db }) {
 				}]
 			});
 
-			return db.Alias
+			return Promise.try(() => {
-				.relatedQuery("item.taskResults", tx).for(id)
+				return db.Alias.query(tx).findById(id);
-				.where({ taskName: taskName })
+			}).then((alias) => {
-				.patch({ isInvalidated: true });
+				return db.TaskResult.query(tx)
+					.where({ task: taskName, itemId: alias.itemId })
+					.patch({ isInvalidated: true });
+			});
 		},
 		setTTL: function (options) {
 			// options = ttl || { id, taskName, ttl }

src/task-stream.js

@@ -9,10 +9,12 @@ const debug = require("debug")("scrapingserver");
 const simpleSource = require("@promistream/simple-source");
 const buffer = require("@promistream/buffer");
 const pipe = require("@promistream/pipe");
+const rateLimit = require("@promistream/rate-limit");
 
 const createMutationAPIWrapper = require("./mutation-api/wrapper");
 const logStatus = require("./log-status");
 const chalk = require("chalk");
+const parallelize = require("@promistream/parallelize");
 
 // FIXME: Revert inlining of task_states once switched to PostgreSQL 12+, which can do this automatically using NOT MATERIALIZED
 let query = `
@@ -90,7 +92,7 @@ module.exports = function (state) {
 
 	// FIXME: Transaction support!
 	
-	return function createTaskStream({ task, taskVersion, taskDependencies, tags, run, ttl, globalRateLimiter, globalParallelize }) {
+	return function createTaskStream({ task, taskVersion, taskDependencies, taskDependents, taskInterval, tags, run, ttl, globalRateLimiter, globalParallelize, parallelTasks }) {
 		// TODO: Make nicer
 		let ttlInSeconds = (ttl != null)
 			? (typeof ttl === "number")
@@ -123,23 +125,27 @@ module.exports = function (state) {
 						// console.log("rows:", result.rows);
 						return result.rows;
 					} else {
-						return Promise.resolve([]).delay(1000);
+						// FIXME: Make this delay configurable, or maybe even use LISTEN/NOTIFY
+						return Promise.resolve([]).delay(30000);
 					}
 				});
 			}),
 			buffer(),
 			globalRateLimiter,
+			(taskInterval != null)
+				? rateLimit(taskInterval)
+				: null,
 			processTaskSafely(task, (item, tx) => {
 				logStatus(task, chalk.bold.cyan, "started", item.id);
 
-				let context = { tx, item, task, taskVersion };
+				let context = { tx, item, task, taskVersion, taskDependents, taskDependencies };
 
 				let databaseMutationAPI = createDatabaseMutationAPI(context);
 				let mutationAPI = createMutationAPIWrapper(context, databaseMutationAPI);
 
 				let queue = [];
 
-				let methods = [ "createItem", "renameItem", "mergeItem", "deleteItem", "createAlias", "deleteAlias", "updateData", "updateMetadata", "expire" ];
+				let methods = [ "createItem", "renameItem", "mergeItem", "deleteItem", "createAlias", "deleteAlias", "updateData", "updateMetadata", "expire", "expireDependents" ];
 				let queueMethods = syncpipe(methods, [
 					(_) => _.map((method) => [ method, function() { queue.push([ method, arguments ]); } ]),
 					(_) => Object.fromEntries(_)
@@ -170,10 +176,12 @@ module.exports = function (state) {
 					return db.TaskResult.query(tx).findById([ task, item.id ]).patch({
 						is_successful: true,
 						updated_at: new Date(),
-						expires_at: dateFns.add(new Date(), { seconds: ttlInSeconds })
+						expires_at: (ttlInSeconds != null)
+							? dateFns.add(new Date(), { seconds: ttlInSeconds })
+							: null
 					});
 				}).catch((error) => {
-					logStatus(task, chalk.bold.red, "failed", item.id);
+					logStatus(task, chalk.bold.red, "failed", `${item.id}: ${error.stack}`);
 
 					return Promise.try(() => {
 						// Task failed -- note, cannot use tx here because it has failed
@@ -185,7 +193,10 @@ module.exports = function (state) {
 					});
 				});
 			}),
-			globalParallelize
+			// TODO: Sort out a cleaner way to organize local vs. global parallelization
+			(parallelTasks != null)
+				? parallelize(parallelTasks)
+				: globalParallelize
 		]);
 	};
 };

yarn.lock

@@ -43,6 +43,11 @@
   resolved "https://registry.yarnpkg.com/@joepie91/eslint-config/-/eslint-config-1.1.0.tgz#9397e6ce0a010cb57dcf8aef8754d3a5ce0ae36a"
   integrity sha512-XliasRSUfOz1/bAvTBaUlCjWDbceCW4y1DnvFfW7Yw9p2FbNRR0w8WoPdTxTCjKuoZ7/OQMeBxIe2y9Qy6rbYw==
 
+"@joepie91/promise-delay-every@^1.0.0":
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/@joepie91/promise-delay-every/-/promise-delay-every-1.0.1.tgz#d30035ef3150a6f7247dfd8a1a03a7a136167b2e"
+  integrity sha512-sMPFngDo7xsfBZWQ9dqARaC+UZdRnvoU6j4LaIPqnf1JmeHL6Bhlm+Nc9hOvrmulAhV0HWoEydJaAxAFTCRapA==
+
 "@joepie91/unreachable@^1.0.0":
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/@joepie91/unreachable/-/unreachable-1.0.0.tgz#8032bb8a5813e81bbbe516cb3031d60818526687"
@@ -83,6 +88,18 @@
   resolved "https://registry.yarnpkg.com/@promistream/is-end-of-stream/-/is-end-of-stream-0.1.1.tgz#7f84e630c9e49a92739df6a8c574eff99dd4c09d"
   integrity sha512-GZn7W0wrUen7kkgWCcwFFgr0g/ftfuddnuK/Tp0MLWCCJA4hyAboglCZP0JzEJdi34gClEP8lCfDwGekw18LHg==
 
+"@promistream/map-filter@^0.1.0":
+  version "0.1.0"
+  resolved "https://registry.yarnpkg.com/@promistream/map-filter/-/map-filter-0.1.0.tgz#2bb4988b386a2e520f2d1cc1b6f7d333a24266d0"
+  integrity sha512-kHO1NvwuxEB4tTZ9b4XR9iBBJftHxT/857KbkWRe0kSt6zvFIVYHSzmKz/cipUx1f2FrmpQC+R6R84MlHD+ugQ==
+  dependencies:
+    "@promistream/propagate-abort" "^0.1.6"
+    "@promistream/propagate-peek" "^0.1.1"
+    "@validatem/core" "^0.3.15"
+    "@validatem/is-function" "^0.1.0"
+    "@validatem/required" "^0.1.1"
+    bluebird "^3.7.2"
+
 "@promistream/map@^0.1.1":
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/@promistream/map/-/map-0.1.1.tgz#2f771372e5d1dd12f41b6efd57874014d406f123"
@@ -95,11 +112,39 @@
     "@validatem/required" "^0.1.1"
     bluebird "^3.5.4"
 
+"@promistream/parallelize@^0.1.0":
+  version "0.1.0"
+  resolved "https://registry.yarnpkg.com/@promistream/parallelize/-/parallelize-0.1.0.tgz#0f261c15e58acc141605a88d01ecce6a7a27612c"
+  integrity sha512-kbu2aheDxOl+PxvZWMkiU5WJdpnR3A+4s3/B9ky1W74tSt40Cl1/Qa+5sQtdmMuuqwhdhDFwjhhSlNJx4LwLJw==
+  dependencies:
+    "@promistream/is-aborted" "^0.1.1"
+    "@promistream/is-end-of-stream" "^0.1.1"
+    "@promistream/pipe" "^0.1.4"
+    "@promistream/propagate-abort" "^0.1.2"
+    "@promistream/sequentialize" "^0.1.0"
+    bluebird "^3.5.4"
+    debug "^4.1.1"
+    default-value "^1.0.0"
+
 "@promistream/pipe@^0.1.2":
   version "0.1.3"
   resolved "https://registry.yarnpkg.com/@promistream/pipe/-/pipe-0.1.3.tgz#8a937cb6f7c42de6afd7ff5657cfef82493e7aed"
   integrity sha512-P3X1xzTO41TfDoRF6kMcsu0yttPaJB14r18jKM4KNpeuafhi7KYP6Vp5Vsnsx5bd90wBhhxDw82zz4xZHuMjMQ==
 
+"@promistream/pipe@^0.1.4":
+  version "0.1.4"
+  resolved "https://registry.yarnpkg.com/@promistream/pipe/-/pipe-0.1.4.tgz#ef05fe582a33768c7eb56ad20635e1b7b48ac95b"
+  integrity sha512-4js6lhu/aTNEMosIBFcCz8Rkxc1S2V4zzI2QvZp9HqglhL5UTuxnv5VbU2ZlPFAFVID1aJOurZ8KdiVagHfOCw==
+  dependencies:
+    "@validatem/allow-extra-properties" "^0.1.0"
+    "@validatem/anything" "^0.1.0"
+    "@validatem/array-of" "^0.1.2"
+    "@validatem/core" "^0.3.15"
+    "@validatem/error" "^1.1.0"
+    "@validatem/remove-nullish-items" "^0.1.0"
+    "@validatem/required" "^0.1.1"
+    "@validatem/wrap-error" "^0.3.0"
+
 "@promistream/propagate-abort@^0.1.2", "@promistream/propagate-abort@^0.1.6":
   version "0.1.6"
   resolved "https://registry.yarnpkg.com/@promistream/propagate-abort/-/propagate-abort-0.1.6.tgz#dfc3c78c2e22662b9e5d548afce2180c40584ef5"
@@ -110,6 +155,28 @@
   resolved "https://registry.yarnpkg.com/@promistream/propagate-peek/-/propagate-peek-0.1.1.tgz#c7dd69efcd894c408d7a3e9713b6a9036f70a501"
   integrity sha512-4xfkSmtPQzlvL4+KCquPHX7sPXiAACGJac/y7fB3Sv6ZKXAT/cjTfms1nEjlDGn1nroN0MzReBza2HnpF59deg==
 
+"@promistream/rate-limit@^1.0.1":
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/@promistream/rate-limit/-/rate-limit-1.0.1.tgz#e7fc1baf231df34d014d89594acc6f95626c4628"
+  integrity sha512-miBc4WR1xhcliAMzO04tetxsDNgVTlP96amf3pomxhScQiazLtX4U+oHFRcaCKscC82kkQFSZOCcRTDE+yw+Sw==
+  dependencies:
+    "@joepie91/promise-delay-every" "^1.0.0"
+    "@promistream/propagate-abort" "^0.1.6"
+    "@promistream/propagate-peek" "^0.1.1"
+    bluebird "^3.5.4"
+    debug "^4.3.1"
+    ms "^2.1.1"
+
+"@promistream/sequentialize@^0.1.0":
+  version "0.1.0"
+  resolved "https://registry.yarnpkg.com/@promistream/sequentialize/-/sequentialize-0.1.0.tgz#8cab499c2518ee856fcb1e13943859ca5b77ba71"
+  integrity sha512-lm7wJmlOSmBvHq49zLfs3cghOt9kcRhLezCbuhXQUXhhiaKLCvYuyA1AGId0kiJDPX2SggrU3Ojb+TOcxPEAqw==
+  dependencies:
+    "@joepie91/unreachable" "^1.0.0"
+    "@promistream/propagate-abort" "^0.1.2"
+    bluebird "^3.5.4"
+    p-defer "^3.0.0"
+
 "@promistream/simple-sink@^0.1.1":
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/@promistream/simple-sink/-/simple-sink-0.1.1.tgz#e3808179102ffe4bc10d70d681f19c649e1f3811"
@@ -363,6 +430,11 @@
   dependencies:
     "@validatem/error" "^1.0.0"
 
+"@validatem/remove-nullish-items@^0.1.0":
+  version "0.1.0"
+  resolved "https://registry.yarnpkg.com/@validatem/remove-nullish-items/-/remove-nullish-items-0.1.0.tgz#fe1a8b64d11276b506fae2bd2c41da4985a5b5ff"
+  integrity sha512-cs4YSF47TA/gHnV5muSUUqGi5PwybP5ztu5SYnPKxQVTyubvcbrFat51nOvJ2PmUasyrIccoYMmATiviXkTi6g==
+
 "@validatem/require-either@^0.1.0":
   version "0.1.0"
   resolved "https://registry.yarnpkg.com/@validatem/require-either/-/require-either-0.1.0.tgz#250e35ab06f124ea90f3925d74b5f53a083923b0"
@@ -412,6 +484,19 @@
     default-value "^1.0.0"
     split-filter-n "^1.1.2"
 
+"@validatem/wrap-error@^0.3.0":
+  version "0.3.0"
+  resolved "https://registry.yarnpkg.com/@validatem/wrap-error/-/wrap-error-0.3.0.tgz#f8d170e79b6fdd68321d82c60581ad345be7d6b9"
+  integrity sha512-km5v6F/Xm7j8W/tmCmht2BTzxMLSpBUJ5MdhJD7ABEut/fdO0tNca1u1imTnWCULCJcdDHbNtpSmDMvXFg3E7Q==
+  dependencies:
+    "@validatem/combinator" "^0.1.1"
+    "@validatem/error" "^1.0.0"
+    "@validatem/match-validation-error" "^0.1.0"
+    "@validatem/validation-result" "^0.1.2"
+    as-expression "^1.0.0"
+    default-value "^1.0.0"
+    split-filter-n "^1.1.2"
+
 "@validatem/wrap-value-as-option@^0.1.0":
   version "0.1.0"
   resolved "https://registry.yarnpkg.com/@validatem/wrap-value-as-option/-/wrap-value-as-option-0.1.0.tgz#57fa8d535f6cdf40cf8c8846ad45f4dd68f44568"
@@ -1934,7 +2019,7 @@ ms@2.1.2:
   resolved "https://registry.yarnpkg.com/ms/-/ms-2.1.2.tgz#d09d1f357b443f493382a8eb3ccd183872ae6009"
   integrity sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==
 
-ms@^2.1.3:
+ms@^2.1.1, ms@^2.1.3:
   version "2.1.3"
   resolved "https://registry.yarnpkg.com/ms/-/ms-2.1.3.tgz#574c8138ce1d2b5861f0b44579dbadd60c6615b2"
   integrity sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==
@@ -2041,6 +2126,11 @@ optionator@^0.9.1:
     type-check "^0.4.0"
     word-wrap "^1.2.3"
 
+p-defer@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/p-defer/-/p-defer-3.0.0.tgz#d1dceb4ee9b2b604b1d94ffec83760175d4e6f83"
+  integrity sha512-ugZxsxmtTln604yeYd29EGrNhazN2lywetzpKhfmQjW/VJmhpDmWbiX+h0zL8V91R0UXkhb3KtPmyq9PZw3aYw==
+
 packet-reader@1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/packet-reader/-/packet-reader-1.0.0.tgz#9238e5480dedabacfe1fe3f2771063f164157d74"