rpc/grapherclient.go
// Copyright © 2016 Asteris, LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package rpc
import (
"io"
"github.com/asteris-llc/converge/graph"
"github.com/asteris-llc/converge/graph/node"
"github.com/asteris-llc/converge/rpc/pb"
"github.com/pkg/errors"
"golang.org/x/net/context"
"google.golang.org/grpc"
)
// NewGrapherClient returns a client for a server that implements Executor
func NewGrapherClient(ctx context.Context, addr string, security *Security) (*GrapherClient, error) {
opts, err := security.Client()
if err != nil {
return nil, errors.Wrap(err, "could not get client options")
}
cc, err := grpc.DialContext(ctx, addr, opts...)
if err != nil {
return nil, err
}
return &GrapherClient{pb.NewGrapherClient(cc)}, nil
}
// GrapherClient is a wrapper around a pb.GrapherClient
type GrapherClient struct {
client pb.GrapherClient
}
// Graph gets the graph from the remote side
func (gc *GrapherClient) Graph(ctx context.Context, loc *pb.LoadRequest, opts ...grpc.CallOption) (*graph.Graph, error) {
stream, err := gc.client.Graph(ctx, loc, opts...)
if err != nil {
return nil, errors.Wrap(err, "could not open stream")
}
g := graph.New()
for {
container, err := stream.Recv()
if err == io.EOF {
break
}
if err != nil {
return nil, errors.Wrap(err, "error getting graph component")
}
if container.Component == nil {
continue
}
if vertex := container.GetVertex(); vertex != nil {
g.Add(node.New(vertex.Id, vertex))
} else if edge := container.GetEdge(); edge != nil {
var parent bool
for _, attr := range edge.Attributes {
if attr == "parent" {
parent = true
}
}
if parent {
g.ConnectParent(edge.Source, edge.Dest)
} else {
g.Connect(edge.Source, edge.Dest)
}
}
}
return g, nil
}