/
resolve.go
77 lines (63 loc) · 1.6 KB
/
resolve.go
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// Package resolve is setting grpc client-side load balancing policy.
package resolve
import (
"fmt"
"net/url"
"sync"
"google.golang.org/grpc/resolver"
)
var mutex = &sync.Mutex{}
// Register address and serviceName
func Register(scheme string, serviceName string, address []string) string {
mutex.Lock()
defer mutex.Unlock()
endpoint := fmt.Sprintf("%s:///%s", scheme, serviceName)
u, _ := url.Parse(endpoint)
resolver.Register(&ResolverBuilder{
scheme: scheme,
serviceName: serviceName,
addrs: address,
path: u.Path,
})
return endpoint
}
// ResolverBuilder resolver struct
type ResolverBuilder struct {
scheme string
serviceName string
addrs []string
path string
}
// Build resolver
func (r *ResolverBuilder) Build(target resolver.Target, cc resolver.ClientConn, _ resolver.BuildOptions) (resolver.Resolver, error) {
blr := &blResolver{
target: target,
cc: cc,
addrsStore: map[string][]string{
r.path: r.addrs,
},
}
blr.start()
return blr, nil
}
// Scheme get scheme
func (r *ResolverBuilder) Scheme() string {
return r.scheme
}
type blResolver struct {
target resolver.Target
cc resolver.ClientConn
addrsStore map[string][]string
}
func (b *blResolver) start() {
addrStrs := b.addrsStore[b.target.URL.Path]
addrs := make([]resolver.Address, len(addrStrs))
for i, s := range addrStrs {
addrs[i] = resolver.Address{Addr: s}
}
_ = b.cc.UpdateState(resolver.State{Addresses: addrs})
}
// ResolveNow Resolve now
func (*blResolver) ResolveNow(_ resolver.ResolveNowOptions) {}
// Close resolver
func (*blResolver) Close() {}