feat(build): add build context

packages/build/src/context/context.js

@@ -0,0 +1,30 @@
+/*
+  Copyright 2020 Lowdefy, Inc
+
+  Licensed 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 createFileLoader from './fileLoader';
+import createFileSetter from './fileSetter';
+
+function createContext(bootstrapContext) {
+  const context = {
+    logger: bootstrapContext.logger,
+    configLoader: createFileLoader({ baseDir: bootstrapContext.configBaseDir }),
+    artifactSetter: createFileSetter({ baseDir: bootstrapContext.outputBaseDir }),
+  };
+
+  return context;
+}
+
+export default createContext;

packages/build/src/context/fileLoader.js

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+/*
+  Copyright 2020 Lowdefy, Inc
+
+  Licensed 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 { get } from '@lowdefy/helpers';
+import path from 'path';
+import Dataloader from 'dataloader';
+import getFile from '../utils/files/getFile';
+
+function createFileBatchLoader({ baseDir }) {
+  async function loader(keys) {
+    const fetched = [];
+    const promises = keys.map(async (filePath) => {
+      const item = await getFile(path.resolve(baseDir, filePath));
+      fetched.push(item);
+    });
+    await Promise.all(promises);
+    const returned = keys
+      .map((filePath) =>
+        fetched.find((item) => {
+          return get(item, 'filePath') === filePath;
+        })
+      )
+      .map((obj) => obj.content);
+    return returned;
+  }
+  return loader;
+}
+
+function createFileLoader(options) {
+  return new Dataloader(createFileBatchLoader(options));
+}
+
+export default createFileLoader;

packages/build/src/context/fileSetter.js

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+/*
+  Copyright 2020 Lowdefy, Inc
+
+  Licensed 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 path from 'path';
+import writeFile from '../utils/files/writeFile';
+
+class FileSetter {
+  constructor({ baseDir }) {
+    this.baseDir = baseDir;
+  }
+
+  async set({ filePath, content }) {
+    return writeFile({ filePath: path.resolve(this.baseDir, filePath), content });
+  }
+}
+
+function createFileSetter(options) {
+  return new FileSetter(options);
+}
+
+export default createFileSetter;