From e65bf621bac42f07f4a8af5c296f13584b779f60 Mon Sep 17 00:00:00 2001
From: f1ames <dr.odpowiedz@gmail.com>
Date: Thu, 28 Sep 2023 16:32:44 +0200
Subject: [PATCH] refactor: draft ValidatorManager class

---
 admission-webhook/src/index.ts                | 56 ++-----------------
 .../src/utils/validation-server.ts            | 14 ++---
 .../src/utils/validator-manager.ts            | 25 +++++++++
 3 files changed, 38 insertions(+), 57 deletions(-)
 create mode 100644 admission-webhook/src/utils/validator-manager.ts

diff --git a/admission-webhook/src/index.ts b/admission-webhook/src/index.ts
index 68cb5c3..ff49e3d 100644
--- a/admission-webhook/src/index.ts
+++ b/admission-webhook/src/index.ts
@@ -1,7 +1,8 @@
 import pino from 'pino';
-import {AnnotationSuppressor, FingerprintSuppressor, MonokleValidator, RemotePluginLoader, SchemaLoader, DisabledFixer, ResourceParser} from '@monokle/validation';
 import {getInformer} from './utils/get-informer.js';
 import {MonoklePolicy, MonoklePolicyBinding, PolicyManager} from './utils/policy-manager.js';
+import {ValidatorManager} from './utils/validator-manager.js';
+import {ValidationServer} from './utils/validation-server.js';
 
 const logger = pino({
   name: 'Monokle',
@@ -28,56 +29,11 @@ const logger = pino({
   );
 
   const policyManager = new PolicyManager(policyInformer, bindingsInformer, logger);
+  const validatorManager = new ValidatorManager(policyManager);
 
-  // POLICY MANAGER
+  await policyManager.start();
 
-  // // INFORMER
-  // const onPolicy = async (policy: MonoklePolicy) => {
-  //   logger.info({msg: 'Informer: Policy updated', policy});
+  const server = new ValidationServer(validatorManager, logger);
 
-  //   const policyNamespace = policy.metadata?.namespace;
-  //   if (!policyNamespace) {
-  //     logger.error({msg: 'Informer: Policy namespace is empty', metadata: policy.metadata});
-  //     return;
-  //   }
-
-  //   policies.set(policyNamespace, policy.spec);
-
-  //   if (!validators.has(policyNamespace)) {
-  //     validators.set(
-  //       policyNamespace,
-  //       new MonokleValidator(
-  //         {
-  //           loader: new RemotePluginLoader(),
-  //           parser: new ResourceParser(),
-  //           schemaLoader: new SchemaLoader(),
-  //           suppressors: [new AnnotationSuppressor(), new FingerprintSuppressor()],
-  //           fixer: new DisabledFixer(),
-  //         },
-  //         {}
-  //       )
-  //     );
-  //   }
-
-  //   await validators.get(policyNamespace)!.preload(policy.spec);
-  // }
-
-  // const onPolicyRemoval = async (policy: MonoklePolicy) => {
-  //   logger.info('Informer: Policy removed');
-
-  //   const policyNamespace = policy.metadata?.namespace;
-  //   if (!policyNamespace) {
-  //     logger.error({msg: 'Informer: Policy namespace is empty', metadata: policy.metadata});
-  //     return;
-  //   }
-
-  //   policies.delete(policyNamespace);
-  //   validators.delete(policyNamespace);
-  // }
-
-
-  // // SERVER
-  // const server = new ValidationServer(validators, logger);
-
-  // await server.start();
+  await server.start();
 })();
diff --git a/admission-webhook/src/utils/validation-server.ts b/admission-webhook/src/utils/validation-server.ts
index cdab3b1..2763ec2 100644
--- a/admission-webhook/src/utils/validation-server.ts
+++ b/admission-webhook/src/utils/validation-server.ts
@@ -2,8 +2,9 @@ import fastify from "fastify";
 import pino from 'pino';
 import path from "path";
 import {readFileSync} from "fs";
-import {MonokleValidator, Resource} from "@monokle/validation";
+import {Resource} from "@monokle/validation";
 import {V1ValidatingWebhookConfiguration, V1ObjectMeta} from "@kubernetes/client-node";
+import {ValidatorManager} from "./validator-manager";
 
 export type ValidationServerOptions = {
   port: number;
@@ -33,7 +34,7 @@ export class ValidationServer {
   private _shouldValidate: boolean
 
   constructor(
-    private readonly _validators: Map<string, MonokleValidator>,
+    private readonly _validators: ValidatorManager,
     private readonly _logger: ReturnType<typeof pino>,
     private readonly _options: ValidationServerOptions = {
       port: 8443,
@@ -113,10 +114,8 @@ export class ValidationServer {
         return response;
       }
 
-      const validator = this._validators.get(namespace);
-      if (!validator) {
-        this._logger.info({msg: 'No validator found for namespace', namespace});
-
+      const validators = this._validators.getMatchingValidators();
+      if (validators.length === 0) {
         return response;
       }
 
@@ -129,7 +128,8 @@ export class ValidationServer {
       }
 
       const resourceForValidation = this._createResourceForValidation(body);
-      const validationResponse = await validator.validate({ resources: [resourceForValidation] });
+      // @TODO iterate over validators and run them all
+      const validationResponse = await validators[0].validate({ resources: [resourceForValidation] });
 
       const warnings = [];
       const errors = [];
diff --git a/admission-webhook/src/utils/validator-manager.ts b/admission-webhook/src/utils/validator-manager.ts
new file mode 100644
index 0000000..28d7590
--- /dev/null
+++ b/admission-webhook/src/utils/validator-manager.ts
@@ -0,0 +1,25 @@
+import {MonokleValidator} from "@monokle/validation";
+import {PolicyManager} from "./policy-manager";
+
+export class ValidatorManager {
+  private _validators = new Map<string, MonokleValidator>(); // Map<policyName, validator>
+
+  constructor(
+    private readonly _policyManager: PolicyManager,
+  ) {
+    // @TODO implement this._policyManager.on(policyUpdated, this._reloadValidator)
+    // We should preload configuration here instead of in getMatchingValidators since
+    // it would affect performance of the admission webhook response time
+  }
+
+  getMatchingValidators(): MonokleValidator[] {
+    const matchingPolicies = this._policyManager.getMatchingPolicies();
+
+    if (matchingPolicies.length === 0) {
+      return [];
+    }
+
+    // @TODO
+    return [];
+  }
+}
\ No newline at end of file