/
reqs.go
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/
reqs.go
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/*
Copyright (C) 2018 Simon Schmidt
This Source Code Form is subject to the terms of the Mozilla Public
License, v. 2.0. If a copy of the MPL was not distributed with this
file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
package core
import "github.com/byte-mug/walcast/nodes"
//import "github.com/valyala/gorpc"
import "github.com/byte-mug/walcast/rpcdp"
import "github.com/valyala/gorpc"
const (
S_NODEENGINE = "NodeEngine"
)
type requestNodeInfo struct{
From *nodes.NodeRpc
}
/*
Alone = [_,$Self]
Master = [$Self,_]
Slave = [$Master,$Self]
*/
type responseNodeInfo struct{
Master,Slave *nodes.NodeRpc
}
type requestHookUp struct{
From *nodes.NodeRpc
}
type responseHookUp struct{
Master *nodes.NodeRpc
}
type requestHookOff struct{
From *nodes.NodeRpc
}
type replicate struct{
From *nodes.NodeRpc
Config interface{}
}
type redirect struct{
Proposed *nodes.NodeRpc
}
func(ne *NodeEngine) hookUp(target string) {
ne.stateLk.Lock(); defer ne.stateLk.Unlock()
if ne.State()!=ALONE { return }
restart:
resp,err := ne.Pool.Get(target).Call(rpcdp.Request{S_NODEENGINE,requestNodeInfo{&ne.Self}})
if err!=nil { return }
resp2,ok := resp.(responseNodeInfo)
if !ok { return }
if resp2.Master!=nil && resp2.Slave!=nil {
target = resp2.Master.Name
goto restart
}
resp,err = ne.Pool.Get(target).Call(rpcdp.Request{S_NODEENGINE,requestHookUp{&ne.Self}})
if err!=nil { return }
resp3,ok := resp.(responseHookUp)
if !ok { return }
if resp3.Master==nil { return }
ne.master = resp3.Master
}
func(ne *NodeEngine) hookOff() {
ne.stateLk.Lock(); defer ne.stateLk.Unlock()
_,err := ne.Pool.Get(ne.master.Name).Call(rpcdp.Request{S_NODEENGINE,requestHookOff{&ne.Self}})
if err!=nil { return }
ne.master = nil
}
func(ne *NodeEngine) recheck() {
ne.stateLk.RLock(); defer ne.stateLk.RUnlock()
target,ok := ne.master.GetName()
if !ok { return }
restart:
resp,err := ne.Pool.Get(target).Call(rpcdp.Request{S_NODEENGINE,requestNodeInfo{&ne.Self}})
if err!=nil { return }
resp2,ok := resp.(responseNodeInfo)
if !ok { return }
if resp2.Master!=nil && resp2.Slave!=nil {
target = resp2.Master.Name
goto restart
}
if n,ok := ne.master.GetName() ; ok && n==target { return }
go func() {
ne.hookOff()
ne.hookUp(target)
}()
}
func(ne *NodeEngine) pushSlaves() {
ne.stateLk.RLock(); defer ne.stateLk.RUnlock()
if ne.dirty {
i := rpcdp.Request{S_NODEENGINE,replicate{&ne.Self,ne.Config.Export()}}
for n := ne.slaves.Left(); n!=nil ; n = n.Next() {
ne.Pool.Get(n.Key.(string)).Send(i)
}
ne.dirty = false
}
}
func(ne *NodeEngine) redirectSlaves(n *nodes.NodeRpc) {
ne.stateLk.RLock(); defer ne.stateLk.RUnlock()
i := rpcdp.Request{S_NODEENGINE,redirect{n}}
for n := ne.slaves.Left(); n!=nil ; n = n.Next() {
ne.Pool.Get(n.Key.(string)).Send(i)
}
}
func(ne *NodeEngine) Handle(clientAddr string, request interface{}) (response interface{}) {
switch R := request.(type){
case requestNodeInfo:
ne.stateLk.RLock(); defer ne.stateLk.RUnlock()
rni := responseNodeInfo{ne.master,&ne.Self}
if rni.Master==nil && ne.slaves.Root!=nil {
rni = responseNodeInfo{rni.Slave,nil}
}
return rni
case requestHookUp:
ne.stateLk.Lock(); defer ne.stateLk.Unlock()
if ne.master!=nil { return responseHookUp{} }
ne.slaves.Put(R.From.Name,R.From)
ne.allNodes.Put(R.From.Name,nil)
ne.Config.SetNodeNameList(ne.allNodes.Keys())
ne.dirty = true
return responseHookUp{&ne.Self}
case requestHookOff:
ne.stateLk.Lock(); defer ne.stateLk.Unlock()
ne.slaves.Remove(R.From.Name)
ne.allNodes.Remove(R.From.Name)
ne.Config.SetNodeNameList(ne.allNodes.Keys())
ne.dirty = true
return "done!"
case replicate:
ne.stateLk.RLock(); defer ne.stateLk.RUnlock()
if !ne.master.Match(R.From) { return "error!" }
ne.Config.Import(R.Config)
return "done!"
case redirect:
go func(){
ne.hookOff()
if R.Proposed!=nil {
ne.hookUp(R.Proposed.Name)
}
}()
return "done!"
}
return "error!"
}
func init(){
gorpc.RegisterType(requestNodeInfo{})
gorpc.RegisterType(responseNodeInfo{})
gorpc.RegisterType(requestHookUp{})
gorpc.RegisterType(responseHookUp{})
gorpc.RegisterType(requestHookOff{})
gorpc.RegisterType(replicate{})
gorpc.RegisterType(redirect{})
}