[QA] Canonical Code Coverage Teams and CODEOWNERS Assignment

Add the first draft of the TEAMS assignments,
including defaults for code coverage and teams.
After this PR, we will add a CI check to verify
all defined paths have CODEOWNERship,
and possibly code coverage teams.

Resovles #72692

.ci/Jenkinsfile_coverage

@@ -12,9 +12,10 @@ kibanaPipeline(timeoutMinutes: 240) {
     ]) {
       workers.base(name: 'coverage-worker', size: 'l', ramDisk: false, bootstrapped: false) {
         catchError {
-          kibanaCoverage.runTests()
-          kibanaTeamAssign.load('team_assignment', "### Upload Team Assignment JSON")
-          handleIngestion(TIME_STAMP)
+//          kibanaCoverage.runTests()
+//          kibanaTeamAssign.load('team_assignment', "### Upload Team Assignment JSON")
+//          handleIngestion(TIME_STAMP)
+          kibanaTeamAssign.defineCodeOwners("### Define CODEOWNERS")
         }
         handleFail()
       }

scripts/canonical_codeowners.js

@@ -0,0 +1,21 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+require('../src/setup_node_env');
+require('../src/dev/code_owners').defineCodeOwners();

src/dev/code_coverage/ingest_coverage/__tests__/maybe.test.js

@@ -0,0 +1,42 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { fromNullable } from '../maybe';
+
+describe(`maybe algebraic datatype functions`, () => {
+  const pluck = (x) => (obj) => obj[x];
+  const attempt = (obj) => fromNullable(obj).map(pluck('detail'));
+  describe(`helpers`, () => {
+    it(`'fromNullable' should be a fn`, () => {
+      expect(typeof fromNullable).toBe('function');
+    });
+  });
+  describe(`'fromNullable`, () => {
+    it(`should continue processing if a truthy is calculated`, () => {
+      expect(attempt({ detail: 'x' }).value()).toBe('x');
+    });
+    it(`should drop processing if a falsey is calculated`, () => {
+      const obj = {
+        a: 'abc',
+      };
+
+      expect(fromNullable(obj.b).inspect()).toBe('[Nothing]');
+    });
+  });
+});

src/dev/code_coverage/ingest_coverage/either.js

@@ -20,11 +20,14 @@
 /* eslint new-cap: 0 */
 /* eslint no-unused-vars: 0 */
 
+import { pretty } from './utils';
+
 export const Right = (x) => ({
   chain: (f) => f(x),
   map: (f) => Right(f(x)),
   fold: (leftFn, rightFn) => rightFn(x),
   inspect: () => `Right(${x})`,
+  inspectPretty: () => `Right(${pretty(x)})`,
 });
 
 Right.of = function of(x) {
@@ -40,6 +43,7 @@ export const Left = (x) => ({
   map: (f) => Left(x),
   fold: (leftFn, rightFn) => leftFn(x),
   inspect: () => `Left(${x})`,
+  inspectPretty: () => `Left(${pretty(x)})`,
 });
 
 Left.of = function of(x) {

src/dev/code_coverage/ingest_coverage/maybe.js

@@ -20,6 +20,8 @@
 /* eslint new-cap: 0 */
 /* eslint no-unused-vars: 0 */
 
+import { pretty } from './utils';
+
 /**
  * Just monad used for valid values
  */
@@ -29,6 +31,7 @@ export function Just(x) {
     map: (f) => Maybe.of(f(x)),
     isJust: () => true,
     inspect: () => `Just(${x})`,
+    inspectPretty: () => `Just(${pretty(x)})`,
   };
 }
 Just.of = function of(x) {
@@ -48,6 +51,7 @@ export function Maybe(x) {
     chain: (f) => f(x),
     map: (f) => Maybe(f(x)),
     inspect: () => `Maybe(${x})`,
+    inspectPretty: () => `Maybe(${pretty(x)})`,
     nothing: () => Nothing(),
     isNothing: () => false,
     isJust: () => false,
@@ -60,9 +64,8 @@ Maybe.of = function of(x) {
 export function maybe(x) {
   return Maybe.of(x);
 }
-export function fromNullable(x) {
-  return x !== null && x !== undefined && x !== false && x !== 'undefined' ? just(x) : nothing();
-}
+export const fromNullable = (x) =>
+  x !== null && x !== undefined && x !== false && x !== 'undefined' ? just(x) : nothing();
 
 /**
  * Nothing wraps undefined or null values and prevents errors

src/dev/code_owners/__tests__/code_owners.test.js

@@ -0,0 +1,34 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import expect from '@kbn/expect';
+import { hasPath } from '../';
+
+describe(`Code Owners`, () => {
+  describe(`hasPath predicate fn`, () => {
+    const iterable = new Map();
+    iterable.set('a', 'b');
+    it(`should return true if the iterable has the path`, () => {
+      expect(hasPath('a')(iterable)).to.be(true);
+    });
+    it(`should return false if the iterable does not have the path`, () => {
+      expect(hasPath('b')(iterable)).to.be(false);
+    });
+  });
+});

src/dev/code_owners/flush.js

@@ -0,0 +1,37 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { createWriteStream } from 'fs';
+
+const preamble = `# GitHub CODEOWNERS definition
+# Identify which groups will be pinged by changes to different parts of the codebase.
+# For more info, see https://help.github.com/articles/about-codeowners/\n\n`;
+
+export const flush = (codeOwnersPath) => (log) => (ownersMap) => {
+  log.info(`\n### Flushing to codeOwnersPath: \n\t${codeOwnersPath}`);
+  const file = createWriteStream(codeOwnersPath);
+
+  file.write(preamble);
+
+  ownersMap.forEach(({ owners /* review, teams */ }, key) => {
+    file.write(`${key} ${owners.join(' ')}\n`);
+  });
+
+  file.end();
+};

src/dev/code_owners/helpers.js

@@ -0,0 +1,47 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { pretty } from '../code_coverage/ingest_coverage/utils';
+
+export function teamName(githubHandle) {
+  const prefix = /elastic\//;
+  const dropElastic = dropPrefix(prefix);
+  const prefixedWithES = prefixed(prefix);
+
+  return prefixedWithES(githubHandle) ? dropElastic(githubHandle) : githubHandle;
+}
+
+export function hasPath(path) {
+  return (iterable) => !!iterable.has(path);
+}
+
+function prefixed(prefix) {
+  return (x) => prefix.test(x);
+}
+
+function dropPrefix(prefix) {
+  return (x) => x.replace(prefix, '');
+}
+export function hasOverrides(xs) {
+  return !!Array.isArray(xs[0]);
+}
+
+export function printMap(map) {
+  map.forEach((value, key) => console.log(key + ' -> ' + pretty(value)));
+}

src/dev/code_owners/index.js

@@ -0,0 +1,37 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { resolve } from 'path';
+import { run } from '@kbn/dev-utils';
+import { parseSourceOfTruth } from './parse';
+import { sourceOfTruth as sot } from './owners_source_of_truth';
+import { flush } from './flush';
+
+const ROOT = resolve(__dirname, '../../..');
+const resolveFromRoot = resolve.bind(null, ROOT);
+const codeownersPath = resolveFromRoot('.github/draft_CODEOWNERS');
+const description = `
+
+Create .github/CODEOWNERS file from authoritative source
+
+`;
+
+export const defineCodeOwners = () => {
+  run(({ log }) => flush(codeownersPath)(log)(parseSourceOfTruth(log)(sot)), { description });
+};