Adding gRPC query for escrow address

CHANGELOG.md

@@ -68,6 +68,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (apps/29-fee) [\#1224](https://github.com/cosmos/ibc-go/pull/1224) Adding Query/CounterpartyAddress and CLI to ICS29 fee middleware
 * (apps/29-fee) [\#1225](https://github.com/cosmos/ibc-go/pull/1225) Adding Query/FeeEnabledChannel and Query/FeeEnabledChannels with CLIs to ICS29 fee middleware.
 * (modules/apps/29-fee) [\#1230](https://github.com/cosmos/ibc-go/pull/1230) Adding CLI command for getting incentivized packets for a specific channel-id. 
+* (modules/apps/transfer) [\#1416](https://github.com/cosmos/ibc-go/pull/1416) Adding gRPC endpoint for getting an escrow account for a given port-id and channel-id.
 
 ### Bug Fixes
 

docs/client/swagger-ui/swagger.yaml

@@ -4,6 +4,59 @@ info:
   description: A REST interface for state queries
   version: 1.0.0
 paths:
+  '/ibc/apps/transfer/v1/channels/{channel_id}/ports/{port_id}/escrow_address':
+    get:
+      summary: >-
+        EscrowAddress returns the escrow address for a particular port and
+        channel id.
+      operationId: EscrowAddress
+      responses:
+        '200':
+          description: A successful response.
+          schema:
+            type: object
+            properties:
+              escrow_address:
+                type: string
+                title: the escrow account address
+            description: >-
+              QueryEscrowAddressResponse is the response type of the
+              EscrowAddress RPC method.
+        default:
+          description: An unexpected error response
+          schema:
+            type: object
+            properties:
+              error:
+                type: string
+              code:
+                type: integer
+                format: int32
+              message:
+                type: string
+              details:
+                type: array
+                items:
+                  type: object
+                  properties:
+                    type_url:
+                      type: string
+                    value:
+                      type: string
+                      format: byte
+      parameters:
+        - name: channel_id
+          description: unique channel identifier
+          in: path
+          required: true
+          type: string
+        - name: port_id
+          description: unique port identifier
+          in: path
+          required: true
+          type: string
+      tags:
+        - Query
   '/ibc/apps/transfer/v1/denom_hashes/{trace}':
     get:
       summary: DenomHash queries a denomination hash information.
@@ -12584,6 +12637,15 @@ definitions:
       QueryConnectionsResponse is the response type for the Query/DenomTraces
       RPC
 
+      method.
+  ibc.applications.transfer.v1.QueryEscrowAddressResponse:
+    type: object
+    properties:
+      escrow_address:
+        type: string
+        title: the escrow account address
+    description: >-
+      QueryEscrowAddressResponse is the response type of the EscrowAddress RPC
       method.
   ibc.applications.transfer.v1.QueryParamsResponse:
     type: object

docs/ibc/proto-docs.md

@@ -126,6 +126,8 @@
     - [QueryDenomTraceResponse](#ibc.applications.transfer.v1.QueryDenomTraceResponse)
     - [QueryDenomTracesRequest](#ibc.applications.transfer.v1.QueryDenomTracesRequest)
     - [QueryDenomTracesResponse](#ibc.applications.transfer.v1.QueryDenomTracesResponse)
+    - [QueryEscrowAddressRequest](#ibc.applications.transfer.v1.QueryEscrowAddressRequest)
+    - [QueryEscrowAddressResponse](#ibc.applications.transfer.v1.QueryEscrowAddressResponse)
     - [QueryParamsRequest](#ibc.applications.transfer.v1.QueryParamsRequest)
     - [QueryParamsResponse](#ibc.applications.transfer.v1.QueryParamsResponse)
 
@@ -1920,6 +1922,37 @@ method.
 
 
 
+<a name="ibc.applications.transfer.v1.QueryEscrowAddressRequest"></a>
+
+### QueryEscrowAddressRequest
+QueryEscrowAddressRequest is the request type for the EscrowAddress RPC method.
+
+
+| Field | Type | Label | Description |
+| ----- | ---- | ----- | ----------- |
+| `port_id` | [string](#string) |  | unique port identifier |
+| `channel_id` | [string](#string) |  | unique channel identifier |
+
+
+
+
+
+
+<a name="ibc.applications.transfer.v1.QueryEscrowAddressResponse"></a>
+
+### QueryEscrowAddressResponse
+QueryEscrowAddressResponse is the response type of the EscrowAddress RPC method.
+
+
+| Field | Type | Label | Description |
+| ----- | ---- | ----- | ----------- |
+| `escrow_address` | [string](#string) |  | the escrow account address |
+
+
+
+
+
+
 <a name="ibc.applications.transfer.v1.QueryParamsRequest"></a>
 
 ### QueryParamsRequest
@@ -1962,6 +1995,7 @@ Query provides defines the gRPC querier service.
 | `DenomTraces` | [QueryDenomTracesRequest](#ibc.applications.transfer.v1.QueryDenomTracesRequest) | [QueryDenomTracesResponse](#ibc.applications.transfer.v1.QueryDenomTracesResponse) | DenomTraces queries all denomination traces. | GET|/ibc/apps/transfer/v1/denom_traces|
 | `Params` | [QueryParamsRequest](#ibc.applications.transfer.v1.QueryParamsRequest) | [QueryParamsResponse](#ibc.applications.transfer.v1.QueryParamsResponse) | Params queries all parameters of the ibc-transfer module. | GET|/ibc/apps/transfer/v1/params|
 | `DenomHash` | [QueryDenomHashRequest](#ibc.applications.transfer.v1.QueryDenomHashRequest) | [QueryDenomHashResponse](#ibc.applications.transfer.v1.QueryDenomHashResponse) | DenomHash queries a denomination hash information. | GET|/ibc/apps/transfer/v1/denom_hashes/{trace}|
+| `EscrowAddress` | [QueryEscrowAddressRequest](#ibc.applications.transfer.v1.QueryEscrowAddressRequest) | [QueryEscrowAddressResponse](#ibc.applications.transfer.v1.QueryEscrowAddressResponse) | EscrowAddress returns the escrow address for a particular port and channel id. | GET|/ibc/apps/transfer/v1/channels/{channel_id}/ports/{port_id}/escrow_address|
 
  <!-- end services -->
 

modules/apps/transfer/keeper/grpc_query.go

@@ -108,3 +108,16 @@ func (q Keeper) DenomHash(c context.Context, req *types.QueryDenomHashRequest) (
 		Hash: denomHash.String(),
 	}, nil
 }
+
+// EscrowAddress implements the EscrowAddress gRPC method
+func (q Keeper) EscrowAddress(c context.Context, req *types.QueryEscrowAddressRequest) (*types.QueryEscrowAddressResponse, error) {
+	if req == nil {
+		return nil, status.Error(codes.InvalidArgument, "empty request")
+	}
+
+	addr := types.GetEscrowAddress(req.PortId, req.ChannelId)
+
+	return &types.QueryEscrowAddressResponse{
+		EscrowAddress: addr.String(),
+	}, nil
+}

modules/apps/transfer/keeper/grpc_query_test.go

@@ -7,6 +7,7 @@ import (
 	"github.com/cosmos/cosmos-sdk/types/query"
 
 	"github.com/cosmos/ibc-go/v3/modules/apps/transfer/types"
+	ibctesting "github.com/cosmos/ibc-go/v3/testing"
 )
 
 func (suite *KeeperTestSuite) TestQueryDenomTrace() {
@@ -220,3 +221,45 @@ func (suite *KeeperTestSuite) TestQueryDenomHash() {
 		})
 	}
 }
+
+func (suite *KeeperTestSuite) TestEscrowAddress() {
+	var (
+		req *types.QueryEscrowAddressRequest
+	)
+
+	testCases := []struct {
+		msg      string
+		malleate func()
+		expPass  bool
+	}{
+		{
+			"success",
+			func() {
+				req = &types.QueryEscrowAddressRequest{
+					PortId:    ibctesting.TransferPort,
+					ChannelId: ibctesting.FirstChannelID,
+				}
+			},
+			true,
+		},
+	}
+
+	for _, tc := range testCases {
+		suite.Run(fmt.Sprintf("Case %s", tc.msg), func() {
+			suite.SetupTest() // reset
+
+			tc.malleate()
+			ctx := sdk.WrapSDKContext(suite.chainA.GetContext())
+
+			res, err := suite.queryClient.EscrowAddress(ctx, req)
+
+			if tc.expPass {
+				suite.Require().NoError(err)
+				expected := types.GetEscrowAddress(ibctesting.TransferPort, ibctesting.FirstChannelID).String()
+				suite.Require().Equal(expected, res.EscrowAddress)
+			} else {
+				suite.Require().Error(err)
+			}
+		})
+	}
+}