feat(response-cache): added getScope callback in buildResponseCacheKey

Author: k-i-k-s

.changeset/sour-cars-hang.md

@@ -0,0 +1,5 @@
+---
+'@envelop/response-cache': minor
+---
+
+Added `getScope` callback in `buildResponseCacheKey` params

packages/plugins/response-cache/README.md

@@ -818,3 +818,55 @@ mutation SetNameMutation {
   }
 }
 ```
+
+#### Get scope of the query
+
+Useful for building a cache key that is shared across all sessions when `PUBLIC`.
+
+```ts
+import jsonStableStringify from 'fast-json-stable-stringify'
+import { execute, parse, subscribe, validate } from 'graphql'
+import { envelop } from '@envelop/core'
+import { hashSHA256, useResponseCache } from '@envelop/response-cache'
+
+const getEnveloped = envelop({
+  parse,
+  validate,
+  execute,
+  subscribe,
+  plugins: [
+    // ... other plugins ...
+    useResponseCache({
+      ttl: 2000,
+      session: request => getSessionId(request),
+      buildResponseCacheKey: ({
+        getScope,
+        sessionId,
+        documentString,
+        operationName,
+        variableValues
+      }) =>
+        // Use `getScope()` to put a unique key for every session when `PUBLIC`
+        hashSHA256(
+          [
+            getScope() === 'PUBLIC' ? 'PUBLIC' : sessionId,
+            documentString,
+            operationName ?? '',
+            jsonStableStringify(variableValues ?? {})
+          ].join('|')
+        ),
+      scopePerSchemaCoordinate: {
+        // Set scope for an entire query
+        'Query.getProfile': 'PRIVATE',
+        // Set scope for an entire type
+        PrivateProfile: 'PRIVATE',
+        // Set scope for a single field
+        'Profile.privateData': 'PRIVATE'
+      }
+    })
+  ]
+})
+```
+
+> Note: The use of this callback will increase the ram usage since it memoizes the scope for each
+> query in a weak map.

packages/plugins/response-cache/src/get-scope.ts

@@ -0,0 +1,104 @@
+import {
+  FieldNode,
+  GraphQLList,
+  GraphQLNonNull,
+  GraphQLObjectType,
+  GraphQLOutputType,
+  GraphQLSchema,
+  Kind,
+  parse,
+  SelectionNode,
+  visit,
+} from 'graphql';
+import { memoize1 } from '@graphql-tools/utils';
+import { CacheControlDirective, isPrivate } from './plugin';
+
+/** Parse the selected query fields */
+function parseSelections(
+  selections: ReadonlyArray<SelectionNode> = [],
+  record: Record<string, any>,
+) {
+  for (const selection of selections) {
+    if (selection.kind === Kind.FIELD) {
+      record[selection.name.value] = {};
+      parseSelections(selection.selectionSet?.selections, record[selection.name.value]);
+    }
+  }
+}
+
+/** Iterate over record and parse its fields with schema type */
+function parseRecordWithSchemaType(
+  type: GraphQLOutputType,
+  record: Record<string, any>,
+  prefix?: string,
+): Set<string> {
+  let fields: Set<string> = new Set();
+  if (type instanceof GraphQLNonNull || type instanceof GraphQLList) {
+    fields = new Set([...fields, ...parseRecordWithSchemaType(type.ofType, record, prefix)]);
+  }
+
+  if (type instanceof GraphQLObjectType) {
+    const newPrefixes = [...(prefix ?? []), type.name];
+    fields.add(newPrefixes.join('.'));
+
+    const typeFields = type.getFields();
+    for (const key of Object.keys(record)) {
+      const field = typeFields[key];
+      if (!field) {
+        continue;
+      }
+
+      fields.add([...newPrefixes, field.name].join('.'));
+      if (Object.keys(record[key]).length > 0) {
+        fields = new Set([...fields, ...parseRecordWithSchemaType(field.type, record[key])]);
+      }
+    }
+  }
+
+  return fields;
+}
+
+function getSchemaCoordinatesFromQuery(schema: GraphQLSchema, query: string): Set<string> {
+  const ast = parse(query);
+  let fields: Set<string> = new Set();
+
+  const visitField = (node: FieldNode) => {
+    const record: Record<string, any> = {};
+    const queryFields = schema.getQueryType()?.getFields()[node.name.value];
+
+    if (queryFields) {
+      record[node.name.value] = {};
+      parseSelections(node.selectionSet?.selections, record[node.name.value]);
+
+      fields.add(`Query.${node.name.value}`);
+      fields = new Set([
+        ...fields,
+        ...parseRecordWithSchemaType(queryFields.type, record[node.name.value]),
+      ]);
+    }
+  };
+
+  // Launch the field visitor
+  visit(ast, {
+    Field: visitField,
+  });
+
+  return fields;
+}
+
+export const getScopeFromQuery = (
+  schema: GraphQLSchema,
+  query: string,
+): NonNullable<CacheControlDirective['scope']> => {
+  const fn = memoize1(({ query }: { query: string }) => {
+    const schemaCoordinates = getSchemaCoordinatesFromQuery(schema, query);
+
+    for (const coordinate of schemaCoordinates) {
+      if (isPrivate(coordinate)) {
+        return 'PRIVATE';
+      }
+    }
+    return 'PUBLIC';
+  });
+  return fn({ query });
+};

packages/plugins/response-cache/src/index.ts

@@ -2,3 +2,4 @@ export * from './in-memory-cache.js';
 export * from './plugin.js';
 export * from './cache.js';
 export * from './hash-sha256.js';
+export * from './get-scope.js';

packages/plugins/response-cache/src/plugin.ts

@@ -4,7 +4,7 @@ import {
   DocumentNode,
   ExecutionArgs,
   getOperationAST,
-  GraphQLDirective,
+  GraphQLSchema,
   Kind,
   print,
   TypeInfo,
@@ -30,6 +30,7 @@ import {
   mergeIncrementalResult,
 } from '@graphql-tools/utils';
 import type { Cache, CacheEntityRecord } from './cache.js';
+import { getScopeFromQuery } from './get-scope.js';
 import { hashSHA256 } from './hash-sha256.js';
 import { createInMemoryCache } from './in-memory-cache.js';
 
@@ -47,6 +48,8 @@ export type BuildResponseCacheKeyFunction = (params: {
   sessionId: Maybe<string>;
   /** GraphQL Context */
   context: ExecutionArgs['contextValue'];
+  /** Callback to get the scope */
+  getScope: () => NonNullable<CacheControlDirective['scope']>;
 }) => Promise<string>;
 
 export type GetDocumentStringFunction = (executionArgs: ExecutionArgs) => string;
@@ -76,8 +79,8 @@ export type UseResponseCacheParameter<PluginContext extends Record<string, any>
    * In the unusual case where you actually want to cache introspection query operations,
    * you need to provide the value `{ 'Query.__schema': undefined }`.
    */
-  ttlPerSchemaCoordinate?: Record<string, number | undefined>;
-  scopePerSchemaCoordinate?: Record<string, 'PRIVATE' | 'PUBLIC' | undefined>;
+  ttlPerSchemaCoordinate?: Record<string, CacheControlDirective['maxAge']>;
+  scopePerSchemaCoordinate?: Record<string, CacheControlDirective['scope']>;
   /**
    * Allows to cache responses based on the resolved session id.
    * Return a unique value for each session.
@@ -215,11 +218,11 @@ const getDocumentWithMetadataAndTTL = memoize4(function addTypeNameToDocument(
     ttlPerSchemaCoordinate,
   }: {
     invalidateViaMutation: boolean;
-    ttlPerSchemaCoordinate?: Record<string, number | undefined>;
+    ttlPerSchemaCoordinate?: Record<string, CacheControlDirective['maxAge']>;
   },
-  schema: any,
+  schema: GraphQLSchema,
   idFieldByTypeName: Map<string, string>,
-): [DocumentNode, number | undefined] {
+): [DocumentNode, CacheControlDirective['maxAge']] {
   const typeInfo = new TypeInfo(schema);
   let ttl: number | undefined;
   const visitor: ASTVisitor = {
@@ -238,7 +241,7 @@ const getDocumentWithMetadataAndTTL = memoize4(function addTypeNameToDocument(
         const parentType = typeInfo.getParentType();
         if (parentType) {
           const schemaCoordinate = `${parentType.name}.${fieldNode.name.value}`;
-          const maybeTtl = ttlPerSchemaCoordinate[schemaCoordinate] as unknown;
+          const maybeTtl = ttlPerSchemaCoordinate[schemaCoordinate];
           ttl = calculateTtl(maybeTtl, ttl);
         }
       },
@@ -279,20 +282,38 @@ const getDocumentWithMetadataAndTTL = memoize4(function addTypeNameToDocument(
   return [visit(document, visitWithTypeInfo(typeInfo, visitor)), ttl];
 });
 
-type CacheControlDirective = {
+export type CacheControlDirective = {
   maxAge?: number;
   scope?: 'PUBLIC' | 'PRIVATE';
 };
 
+export let schema: GraphQLSchema;
+let ttlPerSchemaCoordinate: Record<string, CacheControlDirective['maxAge']> = {};
+let scopePerSchemaCoordinate: Record<string, CacheControlDirective['scope']> = {};
+
+export function isPrivate(
+  typeName: string,
+  data?: Record<string, NonNullable<CacheControlDirective['scope']>>,
+): boolean {
+  if (scopePerSchemaCoordinate[typeName] === 'PRIVATE') {
+    return true;
+  }
+  return data
+    ? Object.keys(data).some(
+        fieldName => scopePerSchemaCoordinate[`${typeName}.${fieldName}`] === 'PRIVATE',
+      )
+    : false;
+}
+
 export function useResponseCache<PluginContext extends Record<string, any> = {}>({
   cache = createInMemoryCache(),
   ttl: globalTtl = Infinity,
   session,
   enabled,
   ignoredTypes = [],
   ttlPerType = {},
-  ttlPerSchemaCoordinate = {},
-  scopePerSchemaCoordinate = {},
+  ttlPerSchemaCoordinate: localTtlPerSchemaCoordinate = {},
+  scopePerSchemaCoordinate: localScopePerSchemaCoordinate = {},
   idFields = ['id'],
   invalidateViaMutation = true,
   buildResponseCacheKey = defaultBuildResponseCacheKey,
@@ -308,22 +329,13 @@ export function useResponseCache<PluginContext extends Record<string, any> = {}>
   enabled = enabled ? memoize1(enabled) : enabled;
 
   // never cache Introspections
-  ttlPerSchemaCoordinate = { 'Query.__schema': 0, ...ttlPerSchemaCoordinate };
+  ttlPerSchemaCoordinate = { 'Query.__schema': 0, ...localTtlPerSchemaCoordinate };
   const documentMetadataOptions = {
     queries: { invalidateViaMutation, ttlPerSchemaCoordinate },
     mutations: { invalidateViaMutation }, // remove ttlPerSchemaCoordinate for mutations to skip TTL calculation
   };
+  scopePerSchemaCoordinate = { ...localScopePerSchemaCoordinate };
   const idFieldByTypeName = new Map<string, string>();
-  let schema: any;
-
-  function isPrivate(typeName: string, data: Record<string, unknown>): boolean {
-    if (scopePerSchemaCoordinate[typeName] === 'PRIVATE') {
-      return true;
-    }
-    return Object.keys(data).some(
-      fieldName => scopePerSchemaCoordinate[`${typeName}.${fieldName}`] === 'PRIVATE',
-    );
-  }
 
   return {
     onSchemaChange({ schema: newSchema }) {
@@ -332,9 +344,7 @@ export function useResponseCache<PluginContext extends Record<string, any> = {}>
       }
       schema = newSchema;
 
-      const directive = schema.getDirective('cacheControl') as unknown as
-        | GraphQLDirective
-        | undefined;
+      const directive = schema.getDirective('cacheControl');
 
       mapSchema(schema, {
         ...(directive && {
@@ -522,6 +532,7 @@ export function useResponseCache<PluginContext extends Record<string, any> = {}>
         operationName: onExecuteParams.args.operationName,
         sessionId,
         context: onExecuteParams.args.contextValue,
+        getScope: () => getScopeFromQuery(schema, onExecuteParams.args.document.loc.source.body),
       });
 
       const cachedResponse = (await cache.get(cacheKey)) as ResponseCacheExecutionResult;