Rewrite middlewares to sagas (#117)

* Replace middlewares with sagas

* Remove import-project middleeare from prod store configuration

* Add flow-typed redux-saga, review fixes

* review fixes

package.json

@@ -44,7 +44,8 @@
     "fix-path": "2.1.0",
     "gatsby-cli": "1.1.58",
     "ps-tree": "1.1.0",
-    "yarn": "1.9.2"
+    "yarn": "1.9.2",
+    "redux-saga": "0.16.0"
   },
   "devDependencies": {
     "@babel/core": "7.0.0-rc.1",

src/sagas/dependency.saga.js

@@ -0,0 +1,81 @@
+import { select, call, put, takeEvery } from 'redux-saga/effects';
+import { getPathForProjectId } from '../reducers/paths.reducer';
+import {
+  installDependency,
+  uninstallDependency,
+} from '../services/dependencies.service';
+import { loadProjectDependency } from '../services/read-from-disk.service';
+import {
+  ADD_DEPENDENCY_START,
+  UPDATE_DEPENDENCY_START,
+  DELETE_DEPENDENCY_START,
+  addDependencyFinish,
+  addDependencyError,
+  updateDependencyFinish,
+  updateDependencyError,
+  deleteDependencyFinish,
+  deleteDependencyError,
+} from '../actions';
+
+/**
+ * Trying to install new dependency, if success dispatching "finish" action
+ * if not - dispatching "error" ection
+ */
+export function* addDependency({ projectId, dependencyName, version }) {
+  const projectPath = yield select(getPathForProjectId, projectId);
+  try {
+    yield call(installDependency, projectPath, dependencyName, version);
+    const dependency = yield call(
+      loadProjectDependency,
+      projectPath,
+      dependencyName
+    );
+    yield put(addDependencyFinish(projectId, dependency));
+  } catch (err) {
+    yield call([console, 'error'], 'Failed to install dependency', err);
+    yield put(addDependencyError(projectId, dependencyName));
+  }
+}
+
+/**
+ * Trying to update existing dependency, if success dispatching "finish" action,
+ * if not - dispatching "error" action
+ */
+export function* updateDependency({
+  projectId,
+  dependencyName,
+  latestVersion,
+}) {
+  const projectPath = yield select(getPathForProjectId, projectId);
+  try {
+    yield call(installDependency, projectPath, dependencyName, latestVersion);
+    yield put(updateDependencyFinish(projectId, dependencyName, latestVersion));
+  } catch (err) {
+    yield call([console, 'error'], 'Failed to update dependency', err);
+    yield put(updateDependencyError(projectId, dependencyName));
+  }
+}
+
+/**
+ * Trying to delete dependency, if success dispatching "finish" action,
+ * if not - dispatching "error" action
+ */
+export function* deleteDependency({ projectId, dependencyName }) {
+  const projectPath = yield select(getPathForProjectId, projectId);
+  try {
+    yield call(uninstallDependency, projectPath, dependencyName);
+    yield put(deleteDependencyFinish(projectId, dependencyName));
+  } catch (err) {
+    yield call([console, 'error'], 'Failed to delete dependency', err);
+    yield put(deleteDependencyError(projectId, dependencyName));
+  }
+}
+
+/**
+ * Root dependencies saga, watching for "start" actions
+ */
+export default function* rootSaga() {
+  yield takeEvery(ADD_DEPENDENCY_START, addDependency);
+  yield takeEvery(UPDATE_DEPENDENCY_START, updateDependency);
+  yield takeEvery(DELETE_DEPENDENCY_START, deleteDependency);
+}