Implement remaining graph-node host APIs for templates (#475)

* Implement createWithContext graph-node dataSource host API

* Parse individual context entries

* Implement graph-node dataSource context host API

* Handle array type fields and refactor code

* Resolve all values when parsing an array field

* Fix wasm entity creation with array type fields

* Required codegen changes

packages/codegen/src/data/entities/Contract.yaml

@@ -26,6 +26,13 @@ columns:
     pgType: integer
     tsType: number
     columnType: Column
+  - name: context
+    pgType: jsonb
+    tsType: 'Record<string, { data: any, type: number }>'
+    columnType: Column
+    columnOptions:
+      - option: nullable
+        value: true
 imports:
   - toImport:
       - Entity

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

@@ -229,10 +229,10 @@ export class Database implements DatabaseInterface {
     return this._baseDatabase.saveBlockProgress(repo, block);
   }
 
-  async saveContract (queryRunner: QueryRunner, address: string, kind: string, checkpoint: boolean, startingBlock: number): Promise<Contract> {
+  async saveContract (queryRunner: QueryRunner, address: string, kind: string, checkpoint: boolean, startingBlock: number, context?: any): Promise<Contract> {
     const repo = queryRunner.manager.getRepository(Contract);
 
-    return this._baseDatabase.saveContract(repo, address, kind, checkpoint, startingBlock);
+    return this._baseDatabase.saveContract(repo, address, kind, checkpoint, startingBlock, context);
   }
 
   async updateSyncStatusIndexedBlock (queryRunner: QueryRunner, blockHash: string, blockNumber: number, force = false): Promise<SyncStatus> {

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

@@ -32,7 +32,7 @@ export class {{className}} {{~#if implements}} implements {{implements}} {{~/if}
   {{~#unless @last}},{{/unless}}
   {{~/each}} }
   {{~/if}})
-    {{column.name}}!: {{column.tsType}};
+    {{column.name}}!: {{{column.tsType}}};
   {{~#unless @last}}
 
   {{/unless}}

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

@@ -595,8 +595,8 @@ export class Indexer implements IndexerInterface {
   }
 
   {{/if}}
-  async watchContract (address: string, kind: string, checkpoint: boolean, startingBlock: number): Promise<void> {
-    return this._baseIndexer.watchContract(address, kind, checkpoint, startingBlock);
+  async watchContract (address: string, kind: string, checkpoint: boolean, startingBlock: number, context?: any): Promise<void> {
+    return this._baseIndexer.watchContract(address, kind, checkpoint, startingBlock, context);
   }
 
   updateStateStatusMap (address: string, stateStatus: StateStatus): void {