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Commit b88b562f authored by Kevin Villanueva's avatar Kevin Villanueva
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trying without being a go thread

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mp3/src/servers/coordinator.go
+ 77
− 77
View file @ b88b562f
......@@ -53,7 +53,7 @@ func (host *Server) client_write(message Client_resp) bool {
// Args:
// - key == account name
// - ltype == "R" for read "W" for write
func (host *Server) LockAccount(key string, ltype string) bool {
func (host *Server) LockAccount(key string, ltype string) bool {
obj, ok := host.AccountData.Load(key)
if !ok {
fmt.Println("Attempt to lock non-existent object.")
......@@ -113,7 +113,7 @@ func (host *Server) LockAccount(key string, ltype string) bool {
acc.RW.Lock()
acc.Upgrade.Unlock()
acc.LockType = "W"
// fmt.Println("Couldnt get lock after 50 attempts.")
}
return true
......@@ -170,7 +170,7 @@ func (host *Server) Release(account string, commit bool) bool {
acc.LockType = ""
acc.RW.RUnlock()
// Write Lock
// Write Lock
} else {
acc.LockType = ""
acc.RW.Unlock()
......@@ -183,7 +183,7 @@ func (host *Server) Release(account string, commit bool) bool {
}
// Thread for handling client
func (host *Server) client_listen(){
func (host *Server) client_listen() {
for {
fmt.Println("Awaiting Client Command.")
......@@ -209,7 +209,7 @@ func (host *Server) client_listen(){
}
// Thread for listening to servers
func (host *Server) server_comm(target_server net.Conn){
func (host *Server) server_comm(target_server net.Conn) {
for {
// Wait to receive data
var latest_message Message
......@@ -222,9 +222,9 @@ func (host *Server) server_comm(target_server net.Conn){
}
// Parse message send thread
if latest_message.Msg_type == "RESPONSE"{
if latest_message.Msg_type == "RESPONSE" {
host.Trans_chan <- latest_message
} else if latest_message.Msg_type == "REQUEST"{
} else if latest_message.Msg_type == "REQUEST" {
go host.handle_request(latest_message)
} else if latest_message.Msg_type == "PROBE" {
go host.handle_probe(latest_message)
......@@ -232,7 +232,7 @@ func (host *Server) server_comm(target_server net.Conn){
}
}
func (host *Server) Coordinator(name string){
func (host *Server) Coordinator(name string) {
// Store Transaction
host.Tr = Transaction{Name: name, Accounts: make(map[string]Account), WaitFor: ""}
......@@ -254,24 +254,24 @@ func (host *Server) Coordinator(name string){
fmt.Println("Ended Deposit.")
continue
}
if msg.Command == "WITHDRAW"{
if msg.Command == "WITHDRAW" {
fmt.Println("Started Withdraw.")
host.withdraw(msg)
fmt.Println("Ended Withdraw.")
continue
}
if msg.Command == "BALANCE"{
if msg.Command == "BALANCE" {
fmt.Println("Started Balance.")
host.balance(msg)
fmt.Println("Ended Balance.")
continue
}
if msg.Command == "ABORT"{
if msg.Command == "ABORT" {
fmt.Println("Started Abort.")
host.abort()
return
}
if msg.Command == "COMMIT"{
if msg.Command == "COMMIT" {
fmt.Println("Started Commit.")
host.commit()
return
......@@ -279,7 +279,7 @@ func (host *Server) Coordinator(name string){
}
}
// Hierarchy:
// Hierarchy:
// If Account in host.Tr.Accounts
// -> Make local change
// Else If operation.Branch == this branch
......@@ -294,10 +294,10 @@ func (host *Server) deposit(operation Client_msg) {
var response Message
req_out := Message{
Msg_type: "REQUEST",
Msg_type: "REQUEST",
Transaction: host.Tr.Name,
Server: host.Id,
Acc: operation.Account}
Server: host.Id,
Acc: operation.Account}
// Case 1: Already in map
local_key := operation.Branch + "." + operation.Account
......@@ -309,8 +309,8 @@ func (host *Server) deposit(operation Client_msg) {
if val.LockType == "W" {
val.Balance += operation.Amount
host.Tr.Accounts[local_key] = val
// Lock not "W", need upgrade
// Lock not "W", need upgrade
} else {
// Local upgrade
if operation.Branch == host.Id {
......@@ -318,24 +318,24 @@ func (host *Server) deposit(operation Client_msg) {
val.Balance += operation.Amount
val.LockType = "W"
host.Tr.Accounts[local_key] = val
// Otherwise need remote to upgrade
// Otherwise need remote to upgrade
} else {
req_out.Request = "UPGRADE"
go host.server_write(operation.Branch, req_out)
resp_in := <-host.Trans_chan
if resp_in.Status {
val.Balance += operation.Amount
val.LockType = "W"
host.Tr.Accounts[local_key] = val
} else {
} else {
fmt.Println("Remote failed to upgrade lock.")
}
}
}
// Case 2: Account not in local copy but at local branch
// Case 2: Account not in local copy but at local branch
} else if host.Id == operation.Branch {
cast, ok := host.AccountData.Load(operation.Account)
......@@ -356,7 +356,7 @@ func (host *Server) deposit(operation Client_msg) {
host.Uncommitted[operation.Account] = new_queue
}
host.Mu_Uncommitted.Unlock()
// Acquire write lock
host.LockAccount(operation.Account, "W")
......@@ -385,7 +385,7 @@ func (host *Server) deposit(operation Client_msg) {
host.Tr.Accounts[local_key] = new_acc
}
// If Present and committed
// If Present and committed
} else {
// Get lock and add locally
host.LockAccount(operation.Account, "W")
......@@ -394,7 +394,7 @@ func (host *Server) deposit(operation Client_msg) {
host.Tr.Accounts[local_key] = new_acc
}
// If not in map, create uncommitted account
// If not in map, create uncommitted account
} else {
fmt.Println("Add to global map.")
......@@ -440,7 +440,7 @@ func (host *Server) deposit(operation Client_msg) {
host.Tr.Accounts[local_key] = acc_copy
}
// First to load
// First to load
} else {
// ALready have lock, add our copy locally
acc_copy := *stored_acc
......@@ -453,15 +453,15 @@ func (host *Server) deposit(operation Client_msg) {
}
// Case 3: Acquire Lock and fetch from remote server
// Case 3: Acquire Lock and fetch from remote server
} else {
go host.server_write(operation.Branch, req_out)
// Receive response and upgrade local
response = <- host.Trans_chan
response = <-host.Trans_chan
new_local := Account{
Branch: operation.Branch,
Balance: response.Balance,
Branch: operation.Branch,
Balance: response.Balance,
LockType: "W",
// Committed?
}
......@@ -479,10 +479,10 @@ func (host *Server) withdraw(operation Client_msg) {
var response Message
req_out := Message{
Msg_type: "REQUEST",
Msg_type: "REQUEST",
Transaction: host.Tr.Name,
Server: host.Id,
Acc: operation.Account}
Server: host.Id,
Acc: operation.Account}
// Case 1: Already in map
local_key := operation.Branch + "." + operation.Account
......@@ -491,33 +491,33 @@ func (host *Server) withdraw(operation Client_msg) {
if val.LockType == "W" {
val.Balance -= operation.Amount
host.Tr.Accounts[local_key] = val
// Lock not "W", need upgrade
} else {
// Lock not "W", need upgrade
} else {
// Local upgrade
if operation.Branch == host.Id {
host.Upgrade(operation.Account)
val.Balance -= operation.Amount
val.LockType = "W"
host.Tr.Accounts[local_key] = val
// Remote upgrade
// Remote upgrade
} else {
req_out.Request = "UPGRADE"
go host.server_write(operation.Branch, req_out)
resp_in := <-host.Trans_chan
if resp_in.Status {
val.Balance += operation.Amount
val.LockType = "W"
host.Tr.Accounts[local_key] = val
} else {
} else {
fmt.Println("Remote failed to upgrade lock.")
}
}
}
// Case 2: Account not in local copy but at local branch
// Case 2: Account not in local copy but at local branch
} else if host.Id == operation.Branch {
// Check if exists in global map
cast, ok := host.AccountData.Load(operation.Account)
......@@ -530,10 +530,10 @@ func (host *Server) withdraw(operation Client_msg) {
host.abort()
return
// Else grab lock, update and add locally
// Else grab lock, update and add locally
} else {
realAcc := cast.(*Account)
host.LockAccount(operation.Account, "W")
// If account uncommitted, unlock and abort
......@@ -550,12 +550,12 @@ func (host *Server) withdraw(operation Client_msg) {
host.Tr.Accounts[local_key] = acc_copy
}
// Case 3: Acquire Lock and fetch from remote server
// Case 3: Acquire Lock and fetch from remote server
} else {
go host.server_write(operation.Branch, req_out)
host.server_write(operation.Branch, req_out)
// Receive response and upgrade local
response = <- host.Trans_chan
response = <-host.Trans_chan
// Abort nonexistent
if !response.Acc_Exists {
......@@ -566,10 +566,10 @@ func (host *Server) withdraw(operation Client_msg) {
}
new_local := Account{
Branch: operation.Branch,
Balance: response.Balance,
Branch: operation.Branch,
Balance: response.Balance,
LockType: "W",
// Committed?
// Committed?
}
new_local.Balance -= operation.Amount
......@@ -584,11 +584,11 @@ func (host *Server) balance(operation Client_msg) {
var response Message
var bal int
req_out := Message{
Msg_type: "REQUEST",
Msg_type: "REQUEST",
Transaction: host.Tr.Name,
Server: host.Id,
Request: "RLOCK",
Acc: operation.Account}
Server: host.Id,
Request: "RLOCK",
Acc: operation.Account}
// Case 1: Already in map
local_key := operation.Branch + "." + operation.Account
......@@ -596,7 +596,7 @@ func (host *Server) balance(operation Client_msg) {
// Just return balance
bal = val.Balance
// Case 2: Account not in local copy but at local branch
// Case 2: Account not in local copy but at local branch
} else if host.Id == operation.Branch {
// Check if exists in global map
cast, ok := host.AccountData.Load(operation.Account)
......@@ -609,10 +609,10 @@ func (host *Server) balance(operation Client_msg) {
host.abort()
return
// Else grab read lock
// Else grab read lock
} else {
realAcc := cast.(*Account)
host.LockAccount(operation.Account, "R")
// If account uncommitted, unlock and abort
......@@ -629,12 +629,12 @@ func (host *Server) balance(operation Client_msg) {
}
}
// Case 3: Acquire Lock and fetch from remote server
// Case 3: Acquire Lock and fetch from remote server
} else {
go host.server_write(operation.Branch, req_out)
// Receive response and upgrade local
response = <- host.Trans_chan
response = <-host.Trans_chan
// Abort nonexistent
if !response.Acc_Exists {
......@@ -645,10 +645,10 @@ func (host *Server) balance(operation Client_msg) {
}
new_local := Account{
Branch: operation.Branch,
Balance: response.Balance,
Branch: operation.Branch,
Balance: response.Balance,
LockType: "R",
// Committed?
// Committed?
}
host.Tr.Accounts[local_key] = new_local
bal = new_local.Balance
......@@ -661,7 +661,7 @@ func (host *Server) balance(operation Client_msg) {
// Abort Process:
// 1.) Parse Local Accounts and release all remote and local locks
// 2.) Clear Host Struct to end transaction
func (host *Server) abort(){
func (host *Server) abort() {
// Iterate Local Transaction
for acc, data := range host.Tr.Accounts {
// Local Account
......@@ -669,14 +669,14 @@ func (host *Server) abort(){
acc_name := div[1]
if data.Branch == host.Id {
host.Release(acc_name, false)
// Remote Account
// Remote Account
} else {
msg_out := Message{
Msg_type: "REQUEST",
Msg_type: "REQUEST",
Transaction: host.Tr.Name,
Server: host.Id,
Request: "ABORT",
Acc: acc_name}
Server: host.Id,
Request: "ABORT",
Acc: acc_name}
go host.server_write(data.Branch, msg_out)
}
}
......@@ -694,12 +694,12 @@ func (host *Server) abort(){
// 2.) Release all locks
// 3.) Clear Server struct to end transaction
// - Careful about timing with threads, make sure all updates are done
func (host *Server) commit(){
func (host *Server) commit() {
// Iterate Local Transaction
for acc, data := range host.Tr.Accounts {
div := strings.Split(acc, ".")
acc_name := div[1]
// Local Commit
if data.Branch == host.Id {
cast, ok := host.AccountData.Load(acc_name)
......@@ -712,17 +712,17 @@ func (host *Server) commit(){
fmt.Println("Failed to Commit local change.")
}
host.Release(acc_name, true)
// Remote Commit
// Remote Commit
} else {
msg_out := Message{
Msg_type: "REQUEST",
Msg_type: "REQUEST",
Transaction: host.Tr.Name,
Server: host.Id,
Request: "COMMIT",
Server: host.Id,
Request: "COMMIT",
New_Balance: data.Balance,
Acc: acc_name}
Acc: acc_name}
// POSSIBLE TIMING ISSUE IF FUNCTION ENDS WHILE STILL WAITING ON CHANNEL RESPONSES
go host.server_write(data.Branch, msg_out)
}
......
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