Add GQL query for sync status (#159)

* Add sync status GQL query

* Add sync status GQL query in codegen

packages/codegen/src/schema.ts

@@ -95,6 +95,9 @@ export class Schema {
     // Add a mutation for watching a contract.
     this._addWatchContractMutation();
 
+    // Add type and query for SyncStatus.
+    this._addSyncStatus();
+
     // Add IPLDBlock type and queries.
     this._addIPLDType();
     this._addIPLDQuery();
@@ -331,6 +334,26 @@ export class Schema {
     });
   }
 
+  _addSyncStatus (): void {
+    const typeComposer = this._composer.createObjectTC({
+      name: 'SyncStatus',
+      fields: {
+        latestIndexedBlockHash: 'String!',
+        latestIndexedBlockNumber: 'Int!',
+        latestCanonicalBlockHash: 'String!',
+        latestCanonicalBlockNumber: 'Int!'
+      }
+    });
+
+    this._composer.addSchemaMustHaveType(typeComposer);
+
+    this._composer.Query.addFields({
+      getSyncStatus: {
+        type: this._composer.getOTC('SyncStatus')
+      }
+    });
+  }
+
   _addIPLDType (): void {
     const typeComposer = this._composer.createObjectTC({
       name: 'ResultIPLDBlock',

packages/codegen/src/templates/resolvers-template.handlebars

@@ -114,12 +114,18 @@ export const createResolvers = async (indexer: Indexer, eventWatcher: EventWatch
         return ipldBlock && ipldBlock.block.isComplete ? indexer.getResultIPLDBlock(ipldBlock) : undefined;
       },
 
-      getState: async (_: any, { blockHash, contractAddress, kind = StateKind.Diff }: { blockHash: string, contractAddress: string, kind: string }) => {
+      getState: async (_: any, { blockHash, contractAddress, kind = StateKind.Checkpoint }: { blockHash: string, contractAddress: string, kind: string }) => {
         log('getState', blockHash, contractAddress, kind);
 
         const ipldBlock = await indexer.getPrevIPLDBlock(blockHash, contractAddress, kind);
 
         return ipldBlock && ipldBlock.block.isComplete ? indexer.getResultIPLDBlock(ipldBlock) : undefined;
+      },
+
+      getSyncStatus: async () => {
+        log('getSyncStatus');
+
+        return indexer.getSyncStatus();
       }
     }
   };