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bcast.go
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bcast.go
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package peer
import (
"fmt"
"log"
"time"
"github.com/glycerine/hnatsd/peer/api"
"github.com/glycerine/hnatsd/peer/gcli"
"github.com/glycerine/nats"
)
func (peer *Peer) ClientInitiateBcastGet(key []byte, includeValue bool, timeout time.Duration, who string) (kis []*api.KeyInv, err error) {
//p("%s top of ClientInitiateBcastGet(). who='%s'.", peer.loc.ID, who)
peers, err := peer.GetPeerList(timeout)
if err != nil || peers == nil || len(peers.Members) <= 1 || who == peer.loc.ID {
// no peers, just do the local get.
//p("no peers in BcastGet!?")
ki, err := peer.LocalGet(key, includeValue)
if err != nil {
return nil, err
}
kis = append(kis, ki)
return kis, err
}
numPeers := len(peers.Members)
if who != "" {
// request to restrict to just one peer.
numPeers = 1
}
//p("numPeers = %v", numPeers)
// actually make the request over NATS
bgr := &api.BcastGetRequest{
FromID: peers.MyID,
Key: key,
Who: who,
IncludeValue: includeValue,
ReplyGrpcHost: peer.GservCfg.ExternalHost,
ReplyGrpcXPort: peer.GservCfg.ExternalLsnPort,
ReplyGrpcIPort: peer.GservCfg.InternalLsnPort,
}
mm, err := bgr.MarshalMsg(nil)
panicOn(err)
// slightly different sending over NATS, depending
// on how the reply is expected.
sorter := NewInventory()
if includeValue {
// gRPC response expected
err = peer.nc.Publish(peer.subjBcastGet, mm)
if err != nil {
return nil, err
}
peer.nc.Flush()
toCh := time.After(timeout)
for i := 0; i < numPeers; i++ {
select { // 107 hung here
case <-toCh:
return nil, ErrTimedOut
case <-peer.Halt.ReqStop.Chan:
peer.Halt.Done.Close()
return nil, ErrShutdown
case bgReply := <-peer.GservCfg.ServerGotGetReply:
//p("BcastGet got a reply, on i = %v", i)
if bgReply.Err != "" {
return nil, fmt.Errorf(bgReply.Err)
} else {
bgReply.Ki.When = bgReply.Ki.When.UTC()
sorter.Upsert(bgReply.Ki)
}
}
}
} else {
// NATS response expected
inbox := nats.NewInbox()
ch := make(chan *nats.Msg, RequestChanLen)
s, err := peer.nc.ChanSubscribe(inbox, ch)
if err != nil {
return nil, err
}
defer s.Unsubscribe()
err = peer.nc.PublishRequest(peer.subjBcastGet, inbox, mm)
if err != nil {
return nil, err
}
peer.nc.Flush()
toCh := time.After(timeout)
for i := 0; i < numPeers; i++ {
select {
case <-toCh:
return nil, ErrTimedOut
case reply := <-ch:
//p("BcastGet got a reply, on i = %v. len(reply.Data)=%v", i, len(reply.Data))
if len(reply.Data) == 0 {
panic("reply with no data")
}
var bgReply api.BcastGetReply
_, err := bgReply.UnmarshalMsg(reply.Data)
if err != nil {
return nil, err
}
//p("bgReply = %#v", bgReply)
if bgReply.Err != "" {
return nil, fmt.Errorf(bgReply.Err)
} else {
bgReply.Ki.When = bgReply.Ki.When.UTC()
sorter.Upsert(bgReply.Ki)
}
}
}
} // end else NATS response
//p("done with collection loop, we have %v replies", sorter.Len())
// sorter sorts them by key, then time, then who.
for it := sorter.Min(); !it.Limit(); it = it.Next() {
kis = append(kis, it.Item().(*api.KeyInv))
}
return kis, nil
}
// pull the local boltdb version of the key and
// send it back. User nats if only the key's metadata
// was requested. Use gRPC for sending the large file.
//
func (peer *Peer) ServerHandleBcastGet(msg *nats.Msg) error {
var bgr api.BcastGetRequest
bgr.UnmarshalMsg(msg.Data)
log.Printf("%s peer recevied subjBcastGet for key '%s'",
peer.saver.whoami, string(bgr.Key))
key := bgr.Key
who := bgr.Who
includeValue := bgr.IncludeValue
//p("%s top of ServerHandleBcastGet(). who='%s'.", peer.loc.ID, who)
// it may well be that peer.loc.ID != peer.saver.whoami
// are we filtered down to a specific peer request?
if who != "" {
// yep
if who == peer.loc.ID || who == peer.saver.whoami {
//p("%s sees peer-specific BcastGet request! matched either peer.loc.ID='%s' or peer.saver.whoami='%s'", who, peer.loc.ID, peer.saver.whoami)
} else {
//p("%s / ID:%s sees peer-specific BcastGet request for '%s' which is not us!", peer.saver.whoami, peer.loc.ID, who)
return nil
}
} else {
//p("Who was not set...")
}
// assemble our response/reply
var reply api.BcastGetReply
reply.FromID = peer.loc.ID
ki, err := peer.LocalGet(key, includeValue)
if err != nil {
log.Printf("peer.LocalGet('%s' returned error '%v'", string(key), err)
reply.Err = err.Error()
} else {
reply.Ki = ki
reply.Ki.Who = reply.FromID // tell recipient who this read came from.
}
//p("debug peer.LocalGet(key='%s') returned ki.Key='%s' and ki.Val='%s'", string(key), string(ki.Key), string(ki.Val[:intMin(100, len(ki.Val))]))
// Asking for big data or no?
// For big data transfer, use gRPC. Can handle unlimited size.
// For small meta-data request, use NATS. Will be faster. Small messages only.
if includeValue {
// gRPC response
// use the SendFile() client to return the BigFile
err = peer.clientDoGrpcSendFileBcastGetReply(&bgr, &reply)
panicOn(err)
} else {
// NATS response
mm, err := reply.MarshalMsg(nil)
panicOn(err)
err = peer.nc.Publish(msg.Reply, mm)
panicOn(err)
}
return nil
}
func (peer *Peer) LocalGet(key []byte, includeValue bool) (ki *api.KeyInv, err error) {
return peer.saver.LocalGet(key, includeValue)
}
func (peer *Peer) LocalSet(ki *api.KeyInv) error {
return peer.saver.LocalSet(ki)
}
func (peer *Peer) GetLatest(key []byte, includeValue bool) (ki *api.KeyInv, err error) {
kis, err := peer.ClientInitiateBcastGet(key, false, time.Second*60, "")
if err != nil {
return nil, err
}
//p("kis=%#v", kis)
// come back sorted by time, so latest is the last.
n := len(kis)
target := kis[n-1]
if !includeValue {
return target, nil
}
// now fetch the data
kisData, err := peer.ClientInitiateBcastGet(key, true, time.Second*60, target.Who)
if err != nil {
return nil, err
}
return kisData[0], nil
}
func (peer *Peer) BcastSet(ki *api.KeyInv) error {
//p("%s top of BcastSet", peer.loc.ID)
timeout := 120 * time.Second
peers, err := peer.GetPeerList(timeout)
if err != nil || peers == nil || len(peers.Members) <= 1 {
// no peers, just do the local set.
//p("no peers in BcastGet!?")
return peer.LocalSet(ki)
}
// save locally
err = peer.LocalSet(ki)
if err != nil {
return err
}
//numPeers := len(peers.Members)
//p("BcastSet sees numPeers = %v", numPeers)
cs, _ := list2status(peers)
//log.Printf("BcastSet: we have clusterStatus: '%s'", &cs)
req := &api.BcastSetRequest{
Ki: ki,
FromID: peers.MyID,
}
return peer.doGrpcClientSendFileSetRequest(req, &cs)
}
const _EMPTY_ = ""
const RequestChanLen = 8
var ErrTimedOut = fmt.Errorf("timed out")
func (peer *Peer) doGrpcClientSendFileSetRequest(req *api.BcastSetRequest, cs *clusterStatus) error {
//p("%s top of BCAST SET doGrpcClientSendFileSetRequest()", peer.loc.ID)
reqBytes, err := req.MarshalMsg(nil)
if err != nil {
return err
}
isBcastSet := true
for _, follower := range cs.follow {
//p("%s BCAST SET doGrpcClientSendFileSetRequest(): on follower %v of %v (follower.loc='%s')", peer.loc.ID, k, len(cs.follow), follower.loc.ID)
// need full location with Interal + Grpc ports
peer.mut.Lock()
fullLoc, ok := peer.lastSeenInternalPortAloc[follower.loc.ID]
peer.mut.Unlock()
if !ok {
log.Printf("no full location available for follower.loc.ID='%s'",
follower.loc.ID)
continue
} else {
//p("fullLoc=%#v", fullLoc)
}
ehost := fullLoc.Grpc.External.Host
eport := fullLoc.Grpc.External.Port
iport := fullLoc.Grpc.Internal.Port
clicfg := &gcli.ClientConfig{
AllowNewServer: peer.SshClientAllowsNewSshdServer,
TestAllowOneshotConnect: peer.TestAllowOneshotConnect,
ServerHost: ehost,
ServerPort: eport,
ServerInternalHost: "127.0.0.1",
ServerInternalPort: iport,
Username: peer.SshClientLoginUsername,
PrivateKeyPath: peer.SshClientPrivateKeyPath,
ClientKnownHostsPath: peer.SshClientClientKnownHostsPath,
SkipEncryption: peer.SkipEncryption,
}
clicfg.ClientSendFile(string(req.Ki.Key), reqBytes, isBcastSet, peer.loc.ID)
//p("%s in doGrpcClientSendFileSetRequest, after clicfg.ClientSendFile()", peer.loc.ID)
log.Printf("%s BcastSet successfully doGrpcClientSendFileSetRequest to external host:port = %v:%v. from fullLoc.Grpc='%#v'", peer.loc.ID, ehost, eport, fullLoc.Grpc)
}
return nil
}
func (peer *Peer) clientDoGrpcSendFileBcastGetReply(bgr *api.BcastGetRequest, reply *api.BcastGetReply) error {
clicfg := &gcli.ClientConfig{
AllowNewServer: peer.SshClientAllowsNewSshdServer,
TestAllowOneshotConnect: peer.TestAllowOneshotConnect,
ServerHost: bgr.ReplyGrpcHost,
ServerPort: bgr.ReplyGrpcXPort,
ServerInternalHost: "127.0.0.1",
ServerInternalPort: bgr.ReplyGrpcIPort,
Username: peer.SshClientLoginUsername,
PrivateKeyPath: peer.SshClientPrivateKeyPath,
ClientKnownHostsPath: peer.SshClientClientKnownHostsPath,
SkipEncryption: peer.SkipEncryption,
}
replyData, err := reply.MarshalMsg(nil)
panicOn(err)
isBcastSet := false
return clicfg.ClientSendFile(string(bgr.Key), replyData, isBcastSet, peer.loc.ID)
}
func (peer *Peer) BackgroundReceiveBcastSetAndWriteToBolt() {
//p("%s top of BackgroundReceiveBcastSetAndWriteToBolt", peer.loc.ID)
go func() {
for {
// if peer.GservCfg == nil || peer.GservCfg.ServerGotSetRequest == nil {
// time.Sleep(time.Second)
// continue
// }
select {
case setReq := <-peer.GservCfg.ServerGotSetRequest:
//p("%s got setReq of len %v from %s on channel peer.GservCfg.ServerGotSetRequest", peer.loc.ID, setReq.FromID, len(setReq.Ki.Val))
// write to bolt
ki := setReq.Ki
if len(ki.Val) > 0 {
err := peer.LocalSet(ki)
//p("debug! bcast.go wrote ki.Val='%s'", string(ki.Val[:intMin(100, len(ki.Val))]))
if err != nil {
log.Printf("gserv/server.go SendFile(): s.peer.LocalSet() errored '%v'", err)
continue
}
} else {
panic("strange: got setReq with zero payload!")
}
case <-peer.Halt.ReqStop.Chan:
//p("BackgroundReceiveBcastSetAndWriteToBolt exiting on Halt.ReqStop")
peer.Halt.Done.Close()
return
}
}
}()
}
/*
bgr := &api.BcastGetRequest{
FromID: peers.MyID,
Key: key,
Who: who,
IncludeValue: includeValue,
ReplyGrpcHost: peer.GservCfg.Host,
ReplyGrpcXPort: peer.GservCfg.ExternalLsnPort,
ReplyGrpcIPort: peer.GservCfg.InternalLsnPort,
}
*/
// p("BcastGet handler about to Publish on msg.Reply='%s'", msg.Reply)