micro/network/handler/handler.go

112 lines
2.6 KiB
Go

// Package handler implements network RPC handler
package handler
import (
"context"
"sort"
"github.com/micro/go-micro/errors"
"github.com/micro/go-micro/network"
pbNet "github.com/micro/go-micro/network/proto"
pbRtr "github.com/micro/go-micro/router/proto"
)
// Network implements network handler
type Network struct {
Network network.Network
}
// ListNodes returns a list of all accessible nodes in the network
func (n *Network) ListNodes(ctx context.Context, req *pbNet.ListRequest, resp *pbNet.ListResponse) error {
nodes := n.Network.Nodes()
var respNodes []*pbNet.Node
for _, node := range nodes {
respNode := &pbNet.Node{
Id: node.Id(),
Address: node.Address(),
}
respNodes = append(respNodes, respNode)
}
resp.Nodes = respNodes
return nil
}
// ListPeers returns a list of all the nodes the node has a direct link with
func (n *Network) ListPeers(ctx context.Context, req *pbNet.PeerRequest, resp *pbNet.PeerResponse) error {
// extract the id of the node to query
id := req.Id
// if no id is passed, we assume local node
if id == "" {
id = n.Network.Id()
}
// get all the nodes in the network
nodes := n.Network.Nodes()
// sort the slice of nodes
sort.Slice(nodes, func(i, j int) bool { return nodes[i].Id() <= nodes[j].Id() })
// find a node with a given id
i := sort.Search(len(nodes), func(j int) bool { return nodes[j].Id() >= id })
var nodePeers []*pbNet.Node
// collect all the node peers into slice
if i < len(nodes) && nodes[i].Id() == id {
for _, peer := range nodes[i].Peers() {
// don't return yourself in response
if peer.Id() == n.Network.Id() {
continue
}
pbPeer := &pbNet.Node{
Id: peer.Id(),
Address: peer.Address(),
}
nodePeers = append(nodePeers, pbPeer)
}
}
// requested node
node := &pbNet.Node{
Id: nodes[i].Id(),
Address: nodes[i].Address(),
}
// creaate peers answer
peers := &pbNet.Peers{
Node: node,
Peers: nodePeers,
}
resp.Peers = peers
return nil
}
// ListRoutes returns a list of routing table routes
func (n *Network) ListRoutes(ctx context.Context, req *pbRtr.Request, resp *pbRtr.ListResponse) error {
routes, err := n.Network.Options().Router.Table().List()
if err != nil {
return errors.InternalServerError("go.micro.network", "failed to list routes: %s", err)
}
var respRoutes []*pbRtr.Route
for _, route := range routes {
respRoute := &pbRtr.Route{
Service: route.Service,
Address: route.Address,
Gateway: route.Gateway,
Network: route.Network,
Router: route.Router,
Link: route.Link,
Metric: int64(route.Metric),
}
respRoutes = append(respRoutes, respRoute)
}
resp.Routes = respRoutes
return nil
}