Add getStateProof() / getProofHash() methods

__tests__/__snapshots__/ain.test.ts.snap

@@ -169,6 +169,8 @@ Object {
 }
 `;
 
+exports[`ain-js Database getProofHash 1`] = `"0x88496dfee3566db91f487aa4cbf69a0c42a3e2a5d0a65bfd4897d699e8734785"`;
+
 exports[`ain-js Database matchFunction 1`] = `
 Object {
   "matched_config": Object {

__tests__/ain.test.ts

@@ -1240,6 +1240,28 @@ describe('ain-js', function() {
       })
     });
 
+    it('getStateProof', async function() {
+      await ain.db.ref('/values/blockchain_params').getStateProof()
+      .then(res => {
+        expect(res).not.toBeNull();
+      })
+      .catch(error => {
+        console.log("error:", error);
+        fail('should not happen');
+      })
+    });
+
+    it('getProofHash', async function() {
+      await ain.db.ref('/values/blockchain_params').getProofHash()
+      .then(res => {
+        expect(res).toMatchSnapshot();
+      })
+      .catch(error => {
+        console.log("error:", error);
+        fail('should not happen');
+      })
+    });
+
     /*it('on and off', function(done) {
       try {
         ain.db.ref().on('value', (snap:any) => console.log)

src/ain-db/ref.ts

@@ -11,6 +11,7 @@ import {
   EvalRuleInput,
   EvalOwnerInput,
   MatchInput,
+  StateInfoInput,
   GetOptions,
 } from '../types';
 import Ain from '../ain';
@@ -347,6 +348,30 @@ export default class Reference {
     return this._ain.provider.send('ain_matchOwner', request);
   }
 
+  /**
+   * Fetches the state proof of a global blockchain state path.
+   * @param {StateInfoInput} params The state info input.
+   * @returns {Promise<any>} The return value of the blockchain API.
+   */
+  getStateProof(params?: StateInfoInput): Promise<any> {
+    const request = {
+      ref: Reference.extendPath(this.path, params ? params.ref : undefined)
+    }
+    return this._ain.provider.send('ain_getStateProof', request);
+  }
+
+  /**
+   * Fetches the proof hash of a global blockchain state path.
+   * @param {StateInfoInput} params The state info input.
+   * @returns {Promise<any>} The return value of the blockchain API.
+   */
+  getProofHash(params?: StateInfoInput): Promise<any> {
+    const request = {
+      ref: Reference.extendPath(this.path, params ? params.ref : undefined)
+    }
+    return this._ain.provider.send('ain_getProofHash', request);
+  }
+
   // TODO(liayoo): Add this function.
   ///**
   // * Attaches an listener for database events.

src/types.ts

@@ -291,6 +291,13 @@ export interface MatchInput {
   is_global?: boolean;
 }
 
+/**
+ * An interface for state information input.
+ */
+export interface StateInfoInput {
+  ref?: string;
+}
+
 /**
  * An interface for state usage information.
  */