Problem: Get validators api doesn't exist

Solution: Add `GET /api/v1/validators` endpoint

bigchaindb/tendermint/lib.py

@@ -243,5 +243,18 @@ class BigchainDB(Bigchain):
     def fastquery(self):
         return fastquery.FastQuery(self.connection, self.me)
 
+    def get_validators(self):
+        try:
+            resp = requests.get(f'{ENDPOINT}validators')
+            validators = resp.json()['result']['validators']
+            for v in validators:
+                v.pop('accum')
+                v.pop('address')
+
+            return validators
+
+        except:
+            raise Exception('Error while processing data from tendermint.')
+
 
 Block = namedtuple('Block', ('app_hash', 'height', 'transactions'))

bigchaindb/web/routes.py

@@ -8,6 +8,7 @@ from bigchaindb.web.views import (
     transactions as tx,
     outputs,
     votes,
+    validators,
 )
 
 
@@ -34,6 +35,7 @@ ROUTES_API_V1 = [
     r('transactions', tx.TransactionListApi),
     r('outputs/', outputs.OutputListApi),
     r('votes/', votes.VotesApi),
+    r('validators/', validators.ValidatorsApi),
 ]
 
 

bigchaindb/web/views/info.py

@@ -50,4 +50,5 @@ def get_api_v1_info(api_prefix):
         'outputs': '{}outputs/'.format(api_prefix),
         'streams': websocket_root,
         'metadata': '{}metadata/'.format(api_prefix),
+        'validators': '{}validators'.format(api_prefix),
     }

bigchaindb/web/views/validators.py

@@ -0,0 +1,24 @@
+from flask import current_app
+from flask_restful import Resource
+
+from bigchaindb.web.views.base import make_error
+
+
+class ValidatorsApi(Resource):
+    def get(self):
+        """API endpoint to get validators set.
+
+        Return:
+            A JSON string containing the validator set of the current node.
+        """
+
+        pool = current_app.config['bigchain_pool']
+
+        try:
+            with pool() as bigchain:
+                validators = bigchain.get_validators()
+
+            return validators
+
+        except:
+            return make_error(500)