[PM-5979] Refactor EnvironmentService (#8040)

Refactor environment service to emit a single observable. This required significant changes to how the environment service behaves and tackles much of the tech debt planned for it.

libs/common/src/state-migrations/migrations/45-merge-environment-state.ts

@@ -0,0 +1,83 @@
+import { KeyDefinitionLike, MigrationHelper, StateDefinitionLike } from "../migration-helper";
+import { Migrator } from "../migrator";
+
+const ENVIRONMENT_STATE: StateDefinitionLike = { name: "environment" };
+
+const ENVIRONMENT_REGION: KeyDefinitionLike = {
+  key: "region",
+  stateDefinition: ENVIRONMENT_STATE,
+};
+
+const ENVIRONMENT_URLS: KeyDefinitionLike = {
+  key: "urls",
+  stateDefinition: ENVIRONMENT_STATE,
+};
+
+const ENVIRONMENT_ENVIRONMENT: KeyDefinitionLike = {
+  key: "environment",
+  stateDefinition: ENVIRONMENT_STATE,
+};
+
+export class MergeEnvironmentState extends Migrator<44, 45> {
+  async migrate(helper: MigrationHelper): Promise<void> {
+    const accounts = await helper.getAccounts<unknown>();
+
+    async function migrateAccount(userId: string, account: unknown): Promise<void> {
+      const region = await helper.getFromUser(userId, ENVIRONMENT_REGION);
+      const urls = await helper.getFromUser(userId, ENVIRONMENT_URLS);
+
+      if (region == null && urls == null) {
+        return;
+      }
+
+      await helper.setToUser(userId, ENVIRONMENT_ENVIRONMENT, {
+        region,
+        urls,
+      });
+      await helper.removeFromUser(userId, ENVIRONMENT_REGION);
+      await helper.removeFromUser(userId, ENVIRONMENT_URLS);
+    }
+
+    await Promise.all([...accounts.map(({ userId, account }) => migrateAccount(userId, account))]);
+
+    const region = await helper.getFromGlobal(ENVIRONMENT_REGION);
+    const urls = await helper.getFromGlobal(ENVIRONMENT_URLS);
+
+    if (region == null && urls == null) {
+      return;
+    }
+
+    await helper.setToGlobal(ENVIRONMENT_ENVIRONMENT, {
+      region,
+      urls,
+    });
+    await helper.removeFromGlobal(ENVIRONMENT_REGION);
+    await helper.removeFromGlobal(ENVIRONMENT_URLS);
+  }
+
+  async rollback(helper: MigrationHelper): Promise<void> {
+    const accounts = await helper.getAccounts<unknown>();
+
+    async function rollbackAccount(userId: string, account: unknown): Promise<void> {
+      const state = (await helper.getFromUser(userId, ENVIRONMENT_ENVIRONMENT)) as {
+        region: string;
+        urls: string;
+      } | null;
+
+      await helper.setToUser(userId, ENVIRONMENT_REGION, state?.region);
+      await helper.setToUser(userId, ENVIRONMENT_URLS, state?.urls);
+      await helper.removeFromUser(userId, ENVIRONMENT_ENVIRONMENT);
+    }
+
+    await Promise.all([...accounts.map(({ userId, account }) => rollbackAccount(userId, account))]);
+
+    const state = (await helper.getFromGlobal(ENVIRONMENT_ENVIRONMENT)) as {
+      region: string;
+      urls: string;
+    } | null;
+
+    await helper.setToGlobal(ENVIRONMENT_REGION, state?.region);
+    await helper.setToGlobal(ENVIRONMENT_URLS, state?.urls);
+    await helper.removeFromGlobal(ENVIRONMENT_ENVIRONMENT);
+  }
+}