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directory.go
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directory.go
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// Copyright 2016 The Vanadium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package discovery
import (
"sync"
v23 "v.io/v23"
"v.io/v23/context"
"v.io/v23/discovery"
"v.io/v23/naming"
"v.io/v23/options"
"v.io/v23/rpc"
"v.io/v23/security"
)
const maxTotalAttachmentSize = 4096
type dirServer struct {
d *idiscovery
mu sync.Mutex
adMap map[discovery.AdId]*AdInfo // GUARDED_BY(mu)
dirAddrs []string // GUARDED_BY(mu)
cancel func()
}
func (s *dirServer) Lookup(ctx *context.T, _ rpc.ServerCall, id discovery.AdId) (AdInfo, error) {
s.mu.Lock()
defer s.mu.Unlock()
adinfo := s.adMap[id]
if adinfo == nil {
return AdInfo{}, ErrorfAdvertisementNotFound(ctx, "advertisement not found: %v", id)
}
copied := *adinfo
copied.Ad.Attachments = make(discovery.Attachments)
sizeSum := 0
for k, v := range adinfo.Ad.Attachments {
if sizeSum+len(v) > maxTotalAttachmentSize {
copied.Status = AdPartiallyReady
continue
}
sizeSum += len(v)
copied.Ad.Attachments[k] = v
}
return copied, nil
}
func (s *dirServer) GetAttachment(ctx *context.T, _ rpc.ServerCall, id discovery.AdId, name string) ([]byte, error) {
s.mu.Lock()
defer s.mu.Unlock()
adinfo := s.adMap[id]
if adinfo == nil {
return nil, ErrorfAdvertisementNotFound(ctx, "advertisement not found: %v", id)
}
return adinfo.Ad.Attachments[name], nil
}
func (s *dirServer) publish(adinfo *AdInfo) {
s.mu.Lock()
adinfo.DirAddrs = s.dirAddrs
s.adMap[adinfo.Ad.Id] = adinfo
s.mu.Unlock()
}
func (s *dirServer) unpublish(id discovery.AdId) {
s.mu.Lock()
delete(s.adMap, id)
s.mu.Unlock()
}
func (s *dirServer) shutdown() {
s.cancel()
}
func (s *dirServer) updateDirAddrs(addrs []string) {
s.mu.Lock()
s.dirAddrs = addrs
newAdinfos := make([]*AdInfo, 0, len(s.adMap))
for id, adinfo := range s.adMap {
newAdinfo := *adinfo
newAdinfo.DirAddrs = s.dirAddrs
s.adMap[id] = &newAdinfo
newAdinfos = append(newAdinfos, &newAdinfo)
}
s.mu.Unlock()
for _, adinfo := range newAdinfos {
s.d.updateAdvertising(adinfo)
}
}
func newDirServer(ctx *context.T, d *idiscovery, opts ...rpc.ServerOpt) (*dirServer, error) {
ctx, cancel := context.WithCancel(ctx)
s := &dirServer{d: d, adMap: make(map[discovery.AdId]*AdInfo), cancel: cancel}
ctx, server, err := v23.WithNewServer(ctx, "", DirectoryServer(s), security.AllowEveryone(), opts...)
if err != nil {
cancel()
return nil, err
}
status := server.Status()
curAddrs := sortedNames(status.Endpoints)
s.updateDirAddrs(curAddrs)
go func() {
for {
select {
case <-status.Dirty:
status = server.Status()
if status.State != rpc.ServerActive {
return
}
newAddrs := sortedNames(status.Endpoints)
if sortedStringsEqual(curAddrs, newAddrs) {
continue
}
s.updateDirAddrs(newAddrs)
curAddrs = newAddrs
case <-ctx.Done():
return
}
}
}()
return s, nil
}
type dirClient struct {
dirAddrs []string
}
func (c *dirClient) Lookup(ctx *context.T, id discovery.AdId) (*AdInfo, error) {
resolved, err := c.resolveDirAddrs(ctx)
if err != nil {
return nil, err
}
adinfo, err := DirectoryClient("").Lookup(ctx, id, resolved)
if err != nil {
return nil, err
}
return &adinfo, nil
}
func (c *dirClient) GetAttachment(ctx *context.T, id discovery.AdId, name string) ([]byte, error) {
resolved, err := c.resolveDirAddrs(ctx)
if err != nil {
return nil, err
}
return DirectoryClient("").GetAttachment(ctx, id, name, resolved)
}
func (c *dirClient) resolveDirAddrs(ctx *context.T) (options.Preresolved, error) {
// We pre-resolve the addresses so that we can utilize the RPC system's handling
// of connecting to the same server by trying multiple endpoints.
ns := v23.GetNamespace(ctx)
resolved := naming.MountEntry{IsLeaf: true}
for _, addr := range c.dirAddrs {
entry, err := ns.Resolve(ctx, addr)
if err != nil {
return options.Preresolved{}, err
}
resolved.Servers = append(resolved.Servers, entry.Servers...)
}
return options.Preresolved{Resolution: &resolved}, nil
}
func newDirClient(dirAddrs []string) *dirClient {
return &dirClient{dirAddrs}
}