// the caller of this function must have the peers mutex.
func (t *Transport) removePeer(id types.ID) {
if peer, ok := t.peers[id]; ok {
peer.Stop()
} else {
plog.Panicf("unexpected removal of unknown peer '%d'", id)
}
delete(t.peers, id)
delete(t.LeaderStats.Followers, id.String())
t.prober.Remove(id.String())
}
// checkClusterCompatibilityFromHeader checks the cluster compatibility of
// the local member from the given header.
// It checks whether the version of local member is compatible with
// the versions in the header, and whether the cluster ID of local member
// matches the one in the header.
func checkClusterCompatibilityFromHeader(header http.Header, cid types.ID) error {
if err := checkVersionCompability(header.Get("X-Server-From"), serverVersion(header), minClusterVersion(header)); err != nil {
plog.Errorf("request version incompatibility (%v)", err)
return errIncompatibleVersion
}
if gcid := header.Get("X-Etcd-Cluster-ID"); gcid != cid.String() {
plog.Errorf("request cluster ID mismatch (got %s want %s)", gcid, cid)
return errClusterIDMismatch
}
return nil
}
// createPostRequest creates a HTTP POST request that sends raft message.
func createPostRequest(u url.URL, path string, body io.Reader, ct string, from, cid types.ID) *http.Request {
uu := u
uu.Path = path
req, err := http.NewRequest("POST", uu.String(), body)
if err != nil {
plog.Panicf("unexpected new request error (%v)", err)
}
req.Header.Set("Content-Type", ct)
req.Header.Set("X-Server-From", from.String())
req.Header.Set("X-Server-Version", version.Version)
req.Header.Set("X-Min-Cluster-Version", version.MinClusterVersion)
req.Header.Set("X-Etcd-Cluster-ID", cid.String())
return req
}
func (t *Transport) AddPeer(id types.ID, us []string) {
t.mu.Lock()
defer t.mu.Unlock()
if _, ok := t.peers[id]; ok {
return
}
urls, err := types.NewURLs(us)
if err != nil {
plog.Panicf("newURLs %+v should never fail: %+v", us, err)
}
fs := t.LeaderStats.Follower(id.String())
t.peers[id] = startPeer(t.streamRt, t.pipelineRt, urls, t.ID, id, t.ClusterID, t.snapst, t.Raft, fs, t.ErrorC, t.term, t.V3demo)
addPeerToProber(t.prober, id.String(), us)
}
func (t *Transport) UpdatePeer(id types.ID, us []string) {
t.mu.Lock()
defer t.mu.Unlock()
// TODO: return error or just panic?
if _, ok := t.peers[id]; !ok {
return
}
urls, err := types.NewURLs(us)
if err != nil {
plog.Panicf("newURLs %+v should never fail: %+v", us, err)
}
t.peers[id].Update(urls)
t.prober.Remove(id.String())
addPeerToProber(t.prober, id.String(), us)
}
func removedMemberStoreKey(id types.ID) string {
return path.Join(storeRemovedMembersPrefix, id.String())
}