micro/network/service/handler/handler.go

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// Package handler implements network RPC handler
package handler
import (
"context"
"github.com/micro/go-micro/errors"
"github.com/micro/go-micro/network"
pbNet "github.com/micro/go-micro/network/proto"
"github.com/micro/go-micro/router"
pbRtr "github.com/micro/go-micro/router/proto"
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"github.com/micro/go-micro/util/log"
)
// Network implements network handler
type Network struct {
Network network.Network
}
func flatten(n network.Node, visited map[string]bool) []network.Node {
// if node is nil runaway
if n == nil {
return nil
}
// set visisted
if visited == nil {
visited = make(map[string]bool)
}
// create new list of nodes
//nolint:prealloc
var nodes []network.Node
// check if already visited
if !visited[n.Id()] {
// append the current node
nodes = append(nodes, n)
}
// set to visited
visited[n.Id()] = true
// visit the list of peers
for _, node := range n.Peers() {
nodes = append(nodes, flatten(node, visited)...)
}
return nodes
}
func (n *Network) Connect(ctx context.Context, req *pbNet.ConnectRequest, resp *pbNet.ConnectResponse) error {
if len(req.Nodes) == 0 {
return nil
}
// get list of existing nodes
nodes := n.Network.Options().Peers
// generate a node map
nodeMap := make(map[string]bool)
for _, node := range nodes {
nodeMap[node] = true
}
for _, node := range req.Nodes {
// TODO: we may have been provided a network only
// so process anad resolve node.Network
if len(node.Address) == 0 {
continue
}
// already exists
if _, ok := nodeMap[node.Address]; ok {
continue
}
nodeMap[node.Address] = true
nodes = append(nodes, node.Address)
}
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log.Infof("Network.Connect setting peers: %v", nodes)
// reinitialise the peers
n.Network.Init(
network.Peers(nodes...),
)
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// call the connect method
n.Network.Connect()
return nil
}
// Nodes returns the list of nodes
func (n *Network) Nodes(ctx context.Context, req *pbNet.NodesRequest, resp *pbNet.NodesResponse) error {
// root node
nodes := map[string]network.Node{}
// get peers encoded into protobuf
peers := flatten(n.Network, nil)
// walk all the peers
for _, peer := range peers {
if peer == nil {
continue
}
if _, ok := nodes[peer.Id()]; ok {
continue
}
// add to visited list
nodes[n.Network.Id()] = peer
resp.Nodes = append(resp.Nodes, &pbNet.Node{
Id: peer.Id(),
Address: peer.Address(),
})
}
return nil
}
// Graph returns the network graph from this root node
func (n *Network) Graph(ctx context.Context, req *pbNet.GraphRequest, resp *pbNet.GraphResponse) error {
depth := uint(req.Depth)
if depth <= 0 || depth > network.MaxDepth {
depth = network.MaxDepth
}
// get peers encoded into protobuf
peers := network.PeersToProto(n.Network, depth)
// set the root node
resp.Root = peers
return nil
}
// Routes returns a list of routing table routes
func (n *Network) Routes(ctx context.Context, req *pbNet.RoutesRequest, resp *pbNet.RoutesResponse) error {
// build query
var qOpts []router.QueryOption
if q := req.Query; q != nil {
if len(q.Service) > 0 {
qOpts = append(qOpts, router.QueryService(q.Service))
}
if len(q.Address) > 0 {
qOpts = append(qOpts, router.QueryAddress(q.Address))
}
if len(q.Gateway) > 0 {
qOpts = append(qOpts, router.QueryGateway(q.Gateway))
}
if len(q.Router) > 0 {
qOpts = append(qOpts, router.QueryRouter(q.Router))
}
if len(q.Network) > 0 {
qOpts = append(qOpts, router.QueryNetwork(q.Network))
}
}
routes, err := n.Network.Options().Router.Table().Query(qOpts...)
if err != nil {
return errors.InternalServerError("go.micro.network", "failed to list routes: %s", err)
}
respRoutes := make([]*pbRtr.Route, 0, len(routes))
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
}
// Services returns a list of services based on the routing table
func (n *Network) Services(ctx context.Context, req *pbNet.ServicesRequest, resp *pbNet.ServicesResponse) error {
routes, err := n.Network.Options().Router.Table().List()
if err != nil {
return errors.InternalServerError("go.micro.network", "failed to list services: %s", err)
}
services := make(map[string]bool)
for _, route := range routes {
if _, ok := services[route.Service]; ok {
continue
}
services[route.Service] = true
resp.Services = append(resp.Services, route.Service)
}
return nil
}