forked from keybase/client
/
connmgr.go
190 lines (166 loc) · 5.5 KB
/
connmgr.go
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// Copyright 2015 Keybase, Inc. All rights reserved. Use of
// this source code is governed by the included BSD license.
package libkb
import (
"fmt"
"sort"
keybase1 "github.com/keybase/client/go/protocol/keybase1"
"github.com/keybase/go-framed-msgpack-rpc/rpc"
)
// ConnectionID is a sequential integer assigned to each RPC connection
// that this process serves. No IDs are reused.
type ConnectionID int
type addConnectionObj struct {
xp rpc.Transporter
ch chan<- ConnectionID
}
type lookupConnectionObj struct {
id ConnectionID
ch chan<- rpc.Transporter
}
type labelConnectionObj struct {
id ConnectionID
details keybase1.ClientDetails
ch chan<- error
}
// ApplyFn can be applied to every connection. It is called with the
// RPC transporter, and also the connectionID. It should return a bool
// true to keep going and false to stop.
type ApplyFn func(i ConnectionID, xp rpc.Transporter) bool
type rpcConnection struct {
transporter rpc.Transporter
details *keybase1.ClientDetails
}
// ConnectionManager manages all connections active for a given service.
// It can be called from multiple goroutines.
type ConnectionManager struct {
nxt ConnectionID
lookup map[ConnectionID](*rpcConnection)
addConnectionCh chan *addConnectionObj
lookupConnectionCh chan *lookupConnectionObj
removeConnectionCh chan ConnectionID
applyAllCh chan ApplyFn
shutdownCh chan struct{}
labelConnectionCh chan labelConnectionObj
listAllCh chan chan<- []keybase1.ClientDetails
}
// AddConnection adds a new connection to the table of Connection object, with a
// related closeListener. We'll listen for a close on that channel, and when one occurs,
// we'll remove the connection from the pool.
func (c *ConnectionManager) AddConnection(xp rpc.Transporter, closeListener chan error) ConnectionID {
retCh := make(chan ConnectionID)
c.addConnectionCh <- &addConnectionObj{xp, retCh}
id := <-retCh
if closeListener != nil {
go func() {
<-closeListener
c.removeConnectionCh <- id
}()
}
return id
}
// LookupConnection looks up a connection given a connectionID, or returns nil
// if no such connection was found.
func (c *ConnectionManager) LookupConnection(i ConnectionID) rpc.Transporter {
retCh := make(chan rpc.Transporter)
c.lookupConnectionCh <- &lookupConnectionObj{i, retCh}
return <-retCh
}
func (c *ConnectionManager) Shutdown() {
close(c.shutdownCh)
}
func (c *ConnectionManager) lookupTransporter(i ConnectionID) (ret rpc.Transporter) {
if conn := c.lookup[i]; conn != nil {
ret = conn.transporter
}
return ret
}
func (c *ConnectionManager) LookupByClientType(clientType keybase1.ClientType) *rpc.Transporter {
for _, v := range c.lookup {
if v.details != nil {
if v.details.ClientType == clientType {
return &v.transporter
}
}
}
return nil
}
func (c *ConnectionManager) Label(id ConnectionID, d keybase1.ClientDetails) error {
retCh := make(chan error)
c.labelConnectionCh <- labelConnectionObj{id: id, details: d, ch: retCh}
return <-retCh
}
func (c *ConnectionManager) ListAllLabeledConnections() []keybase1.ClientDetails {
retCh := make(chan []keybase1.ClientDetails)
c.listAllCh <- retCh
return <-retCh
}
type byClientType []keybase1.ClientDetails
func (a byClientType) Len() int { return len(a) }
func (a byClientType) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
func (a byClientType) Less(i, j int) bool { return a[i].ClientType < a[j].ClientType }
func (c *ConnectionManager) listAllLabeledConnections() (ret []keybase1.ClientDetails) {
for _, v := range c.lookup {
if v.details != nil {
ret = append(ret, *v.details)
}
}
sort.Sort(byClientType(ret))
return ret
}
func (c *ConnectionManager) run() {
for {
select {
case <-c.shutdownCh:
return
case addConnectionObj := <-c.addConnectionCh:
c.nxt++ // increment first, since 0 is reserved
nxt := c.nxt
c.lookup[nxt] = &rpcConnection{transporter: addConnectionObj.xp}
addConnectionObj.ch <- nxt
case lookupConnectionObj := <-c.lookupConnectionCh:
lookupConnectionObj.ch <- c.lookupTransporter(lookupConnectionObj.id)
case id := <-c.removeConnectionCh:
delete(c.lookup, id)
case labelConnectionObj := <-c.labelConnectionCh:
id := labelConnectionObj.id
var err error
if conn := c.lookup[id]; conn != nil {
conn.details = &labelConnectionObj.details
} else {
err = NotFoundError{Msg: fmt.Sprintf("connection %d not found", id)}
}
labelConnectionObj.ch <- err
case retCh := <-c.listAllCh:
retCh <- c.listAllLabeledConnections()
case f := <-c.applyAllCh:
for k, v := range c.lookup {
if !f(k, v.transporter) {
break
}
}
}
}
}
// ApplyAll applies the given function f to all connections in the table.
// If you're going to do something blocking, please do it in a GoRoutine,
// since we're holding the lock for all connections as we do this.
func (c *ConnectionManager) ApplyAll(f ApplyFn) {
c.applyAllCh <- f
}
// NewConnectionManager makes a new ConnectionManager and starts its internal
// routing loop running.
func NewConnectionManager() *ConnectionManager {
ret := &ConnectionManager{
lookup: make(map[ConnectionID](*rpcConnection)),
addConnectionCh: make(chan *addConnectionObj),
lookupConnectionCh: make(chan *lookupConnectionObj),
removeConnectionCh: make(chan ConnectionID),
labelConnectionCh: make(chan labelConnectionObj),
applyAllCh: make(chan ApplyFn),
listAllCh: make(chan chan<- []keybase1.ClientDetails),
shutdownCh: make(chan struct{}),
}
go ret.run()
return ret
}