micro/network/default.go

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package network
import (
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"crypto/sha256"
"fmt"
"sync"
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"time"
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"github.com/google/uuid"
"github.com/micro/go-micro/config/options"
"github.com/micro/go-micro/network/proxy"
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"github.com/micro/go-micro/network/proxy/mucp"
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"github.com/micro/go-micro/network/resolver"
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"github.com/micro/go-micro/network/router"
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"github.com/micro/go-micro/registry"
pb "github.com/micro/go-micro/network/proto"
nreg "github.com/micro/go-micro/network/resolver/registry"
)
type network struct {
options.Options
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// resolver use to connect to the network
resolver resolver.Resolver
// router used to find routes in the network
router router.Router
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// proxy used to route through the network
proxy proxy.Proxy
// id of this network
id string
// links maintained for this network
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// based on peers not nodes. maybe maintain
// node separately or note that links have nodes
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mtx sync.RWMutex
links []Link
}
// network methods
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// lease generates a new lease with a node id/address
// TODO: use a consensus mechanism, pool or some deterministic
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// unique addressing method.
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func (n *network) lease(muid string) *pb.Lease {
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// create the id
id := uuid.New().String()
// create a timestamp
now := time.Now().UnixNano()
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// create the address by hashing the id and timestamp
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h := sha256.New()
h.Write([]byte(fmt.Sprintf("%s-%d\n", id, now)))
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// magic new address
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address := fmt.Sprintf("%x", h.Sum(nil))
// return the node
return &pb.Lease{
Id: id,
Timestamp: now,
Node: &pb.Node{
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Muid: muid,
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Id: id,
Address: address,
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Network: n.id,
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},
}
}
// lookup returns a list of network records in priority order of local
func (n *network) lookup(r registry.Registry) []*resolver.Record {
// create a registry resolver to find local nodes
rr := nreg.Resolver{Registry: r}
// get all the nodes for the network that are local
localRecords, err := rr.Resolve("network:" + n.Id())
if err != nil {
// we're not in a good place here
}
// if its a local network we never try lookup anything else
if n.Id() == "local" {
return localRecords
}
// now resolve incrementally based on resolvers specified
networkRecords, err := n.resolver.Resolve(n.Id())
if err != nil {
// still not in a good place
}
// return aggregate records
return append(localRecords, networkRecords...)
}
func (n *network) Id() string {
return n.id
}
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// Connect connects to the network and returns a new node.
// The node is the callers connection to the network. They
// should advertise this address to people. Anyone else
// on the network should be able to route to it.
func (n *network) Connect() (Node, error) {
return newNode(n)
}
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// Peer is used to establish a link between two networks.
// e.g micro.mu connects to example.com and share routes
// This is done by creating a new node on both networks
// and creating a link between them.
func (n *network) Peer(Network) (Link, error) {
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// New network was created using NewNetwork after receiving routes from a different node
// Connect to the new network and be assigned a node
// Transfer data between the networks
// take other resolver
// order: registry (local), ...resolver
// resolve the network
// periodically connect to nodes resolved in the network
// and add to the network links
return nil, nil
}
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// newNetwork returns a new network interface
func newNetwork(opts ...options.Option) *network {
options := options.NewOptions(opts...)
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// new network instance with defaults
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net := &network{
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Options: options,
id: DefaultId,
router: router.DefaultRouter,
proxy: new(mucp.Proxy),
resolver: new(nreg.Resolver),
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}
// get network id
id, ok := options.Values().Get("network.id")
if ok {
net.id = id.(string)
}
// get router
r, ok := options.Values().Get("network.router")
if ok {
net.router = r.(router.Router)
}
// get proxy
p, ok := options.Values().Get("network.proxy")
if ok {
net.proxy = p.(proxy.Proxy)
}
// get resolver
res, ok := options.Values().Get("network.resolver")
if ok {
net.resolver = res.(resolver.Resolver)
}
return net
}