grpc: Add GetAgentDetails gRPC function

Add a new `GetAgentDetails()` gRPC API that will return details about
the agent to the caller. This is similar to the information the agent
logs in its "announce" log message at startup.

Partially fixes kata-containers#381.

Signed-off-by: James O. D. Hunt <[email protected]>

grpc.go

@@ -1330,3 +1330,20 @@ func (a *agentGRPC) GetGuestDetails(ctx context.Context, req *pb.GuestDetailsReq
 	}
 	return &details, nil
 }
+
+func (a *agentGRPC) GetAgentDetails(ctx context.Context, req *pb.AgentDetailsRequest) (*pb.AgentDetailsResponse, error) {
+	details := &pb.AgentDetailsResponse{
+		Version:    version,
+		InitDaemon: os.Getpid() == 1,
+	}
+
+	for handler := range deviceHandlerList {
+		details.DeviceHandlers = append(details.DeviceHandlers, handler)
+	}
+
+	for handler := range storageHandlerList {
+		details.StorageHandlers = append(details.StorageHandlers, handler)
+	}
+
+	return details, nil
+}

grpc_test.go

@@ -13,16 +13,18 @@ import (
 	"os"
 	"path/filepath"
 	"reflect"
+	"sort"
 	"testing"
 	"time"
 
+	"strconv"
+	"sync"
+
 	pb "github.com/kata-containers/agent/protocols/grpc"
 	"github.com/opencontainers/runc/libcontainer"
 	"github.com/opencontainers/runc/libcontainer/configs"
 	"github.com/opencontainers/runtime-spec/specs-go"
 	"github.com/stretchr/testify/assert"
-	"strconv"
-	"sync"
 )
 
 var testSharedPidNs = "testSharedPidNs"
@@ -645,3 +647,41 @@ func TestGetGuestDetails(t *testing.T) {
 
 	assert.Equal(resp.MemBlockSizeBytes, size)
 }
+
+func TestGetAgentDetails(t *testing.T) {
+	assert := assert.New(t)
+
+	a := &agentGRPC{
+		sandbox: &sandbox{
+			containers: make(map[string]*container),
+		},
+	}
+
+	req := &pb.AgentDetailsRequest{}
+
+	resp, err := a.GetAgentDetails(context.TODO(), req)
+	assert.NoError(err)
+
+	assert.Equal(resp.Version, version)
+	assert.Equal(resp.InitDaemon, os.Getpid() == 1)
+
+	var devices []string
+	var storages []string
+
+	for handler := range deviceHandlerList {
+		devices = append(devices, handler)
+	}
+
+	for handler := range storageHandlerList {
+		storages = append(storages, handler)
+	}
+
+	sort.Sort(sort.StringSlice(resp.DeviceHandlers))
+	sort.Sort(sort.StringSlice(resp.StorageHandlers))
+
+	sort.Sort(sort.StringSlice(devices))
+	sort.Sort(sort.StringSlice(storages))
+
+	assert.Equal(resp.DeviceHandlers, devices)
+	assert.Equal(resp.StorageHandlers, storages)
+}