Minor optimization to reduce schema ID lookups (#123)

Author: rayokota

schemaregistry/mock-schemaregistry-client.ts

@@ -176,7 +176,6 @@ class MockClient implements Client {
       throw new RestError("Schema not found", 404, 40400);
     }
 
-
     return {
       id,
       version,
@@ -202,7 +201,6 @@ class MockClient implements Client {
       if (parsedKey.subject === subject && (!value.softDeleted || deleted)) {
         if (parsedKey.schema.metadata && this.isSubset(metadata, parsedKey.schema.metadata.properties)) {
           results.push({
-            id: parsedKey.schema.id,
             version: value.version,
             subject,
             ...parsedKey.schema
@@ -223,6 +221,18 @@ class MockClient implements Client {
       }
     });
 
+    let id: number = -1;
+    for (const [key, value] of this.idToSchemaCache.entries()) {
+      const parsedKey = JSON.parse(key);
+      if (parsedKey.subject === subject && value.info.schema === latest.schema) {
+        id = parsedKey.id;
+      }
+    }
+    if (id === -1) {
+      throw new RestError("Schema not found", 404, 40400);
+    }
+
+    latest.id = id;
     return latest;
   }
 

schemaregistry/serde/serde.ts

@@ -257,16 +257,15 @@ export abstract class Serializer extends Serde {
       id = await this.client.register(subject, info, Boolean(normalizeSchema))
     } else if (useSchemaId != null && useSchemaId >= 0) {
       info = await this.client.getBySubjectAndId(subject, useSchemaId, format)
-      id = await this.client.getId(subject, info, false)
-      if (id !== useSchemaId) {
-        throw new SerializationError(`failed to match schema ID (${id} != ${useSchemaId})`)
-      }
+      id = useSchemaId
     } else if (useLatestWithMetadata != null && Object.keys(useLatestWithMetadata).length !== 0) {
-      info = await this.client.getLatestWithMetadata(subject, useLatestWithMetadata, true, format)
-      id = await this.client.getId(subject, info, false)
+      let metadata = await this.client.getLatestWithMetadata(subject, useLatestWithMetadata, true, format)
+      info = metadata
+      id = metadata.id
     } else if (useLatest) {
-      info = await this.client.getLatestSchemaMetadata(subject, format)
-      id = await this.client.getId(subject, info, false)
+      let metadata = await this.client.getLatestSchemaMetadata(subject, format)
+      info = metadata
+      id = metadata.id
     } else {
       id = await this.client.getId(subject, info, Boolean(normalizeSchema))
     }