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owenw2
Distributed-Systems-Mps
Commits
7f05e84b
Commit
7f05e84b
authored
2 months ago
by
owenw2
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read write fix, working on commit abort
parent
b834f9e1
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2 changed files
mp3/Server/server.go
+296
-69
296 additions, 69 deletions
mp3/Server/server.go
mp3/config_test.txt
+2
-1
2 additions, 1 deletion
mp3/config_test.txt
with
298 additions
and
70 deletions
mp3/Server/server.go
+
296
−
69
View file @
7f05e84b
...
...
@@ -6,6 +6,7 @@ import (
"fmt"
"net"
"os"
"slices"
"strconv"
"strings"
"sync"
...
...
@@ -25,6 +26,12 @@ type Server struct {
PeerConnectedWG
sync
.
WaitGroup
// wait group for all peers to connect
ClientChan
chan
Request
PeerChan
chan
Request
ClientsAffected
map
[
string
][]
string
// Track multiple affected accounts for each client
VoteClientChans
map
[
string
]
chan
string
// Vote channel for each transaction
TransactionStatus
map
[
string
]
string
// Track the phase of each transaction for each client (for 2pc)
VoteResults
map
[
string
]
bool
// Track vote results for each client and server
}
type
WriteEntry
struct
{
...
...
@@ -57,7 +64,7 @@ type Response struct {
Message
string
}
var
NUM_SERVERS
int
=
1
// number of servers
var
NUM_SERVERS
int
=
2
// number of servers
//////////////////////////////
// CLIENT FUNCTIONS
...
...
@@ -74,38 +81,25 @@ func (server *Server) run_coordinator() {
request
:=
<-
server
.
ClientChan
fmt
.
Println
(
"Got client message:"
,
request
.
Transaction
,
request
.
Branch
,
request
.
Account
,
request
.
Amount
)
// send transaction to correct server
// Track the affected account for the client
if
request
.
Transaction
==
"BALANCE"
||
request
.
Transaction
==
"DEPOSIT"
||
request
.
Transaction
==
"WITHDRAW"
{
if
!
(
slices
.
Contains
(
server
.
ClientsAffected
[
request
.
ClientName
],
request
.
Branch
+
"."
+
request
.
Account
))
{
server
.
ClientsAffected
[
request
.
ClientName
]
=
append
(
server
.
ClientsAffected
[
request
.
ClientName
],
request
.
Branch
+
"."
+
request
.
Account
)
}
}
// Send transaction to correct server
if
request
.
Branch
==
server
.
BranchName
{
// handle transaction
request
.
PeerName
=
server
.
BranchName
go
server
.
handle_transaction
(
request
)
}
else
if
request
.
Transaction
==
"COMMIT"
{
// loop through all accounts and attempt to commit
for
_
,
accountPtr
:=
range
server
.
Accounts
{
commitRequest
:=
Request
{
ClientName
:
request
.
ClientName
,
PeerName
:
server
.
BranchName
,
TimeStamp
:
request
.
TimeStamp
,
// time of client struct
Transaction
:
"COMMIT"
,
// type of transaction
Branch
:
server
.
BranchName
,
Account
:
accountPtr
.
Name
,
Amount
:
0
,
}
go
server
.
handle_commit
(
commitRequest
)
}
request
.
PeerName
=
server
.
BranchName
go
server
.
run_commit
(
request
.
ClientName
)
// start commit server
go
server
.
prepare
(
request
)
// start prepare phase
}
else
if
request
.
Transaction
==
"ABORT"
{
for
_
,
accountPtr
:=
range
server
.
Accounts
{
abortRequest
:=
Request
{
ClientName
:
request
.
ClientName
,
PeerName
:
server
.
BranchName
,
TimeStamp
:
request
.
TimeStamp
,
// time of client struct
Transaction
:
"ABORT"
,
// type of transaction
Branch
:
server
.
BranchName
,
Account
:
accountPtr
.
Name
,
Amount
:
0
,
}
go
server
.
handle_abort
(
abortRequest
)
}
request
.
PeerName
=
server
.
BranchName
go
server
.
prepare
(
request
)
// start prepare phase
go
server
.
send_response_to_client
(
request
.
ClientName
,
false
,
"ABORT"
)
}
else
{
// request another server to handle transaction
request
.
PeerName
=
server
.
BranchName
...
...
@@ -114,11 +108,6 @@ func (server *Server) run_coordinator() {
server
.
PeerEncs
[
address
]
.
Encode
(
&
request
)
server
.
Lock
.
Unlock
()
}
// to send back to client?
enc
:=
gob
.
NewEncoder
(
server
.
Clients
[
request
.
ClientName
])
response
:=
Response
{
Result
:
true
,
Message
:
"OK"
}
enc
.
Encode
(
&
response
)
}
}
...
...
@@ -136,11 +125,14 @@ func (server *Server) handle_client_messages(clientConn net.Conn) {
// add to map
server
.
Lock
.
Lock
()
server
.
Clients
[
request
.
ClientName
]
=
clientConn
server
.
VoteClientChans
[
request
.
ClientName
]
=
make
(
chan
string
)
fmt
.
Println
(
"JUST ADDED CLIENT"
,
server
.
Clients
)
server
.
Lock
.
Unlock
()
for
{
request
:=
Request
{}
err
:=
dec
.
Decode
(
&
request
)
request
.
PeerName
=
server
.
BranchName
if
err
!=
nil
{
fmt
.
Println
(
"Decode error:"
,
err
)
return
...
...
@@ -262,6 +254,132 @@ func (server *Server) connect_to_peers() {
fmt
.
Println
(
"Server Peers:"
,
server
.
Peers
)
}
//////////////////////////////
// COMMIT SERVER FUNCTIONS
//////////////////////////////
/*
* Does: receives and handles commit transactions (one per client)
* Spawns: none
*/
func
(
server
*
Server
)
run_commit
(
clientName
string
)
{
fmt
.
Println
(
"Starting commit handling thread"
)
voteCount
:=
0
requiredVoteCount
:=
len
(
server
.
ClientsAffected
[
clientName
])
fmt
.
Println
(
"Required vote count is"
,
requiredVoteCount
)
fmt
.
Println
(
"Updated Accounts"
,
server
.
ClientsAffected
[
clientName
])
for
{
fmt
.
Println
(
"WAITING FOR VOTE ON"
,
clientName
)
vote
:=
<-
server
.
VoteClientChans
[
clientName
]
// get vote
fmt
.
Println
(
"Received vote"
,
vote
)
// send abort
if
vote
==
"ABORT"
{
fmt
.
Println
(
"OH NO ABORT"
)
server
.
send_response_to_client
(
clientName
,
false
,
"ABORT"
)
return
}
else
{
voteCount
+=
1
}
// send commit
if
voteCount
==
requiredVoteCount
{
// commit send handle commit to all related account
server
.
Lock
.
Lock
()
affectedAccounts
:=
server
.
ClientsAffected
[
clientName
]
server
.
Lock
.
Unlock
()
// Send PREPARE to peers and wait for responses
for
_
,
account
:=
range
affectedAccounts
{
branch
:=
strings
.
Split
(
account
,
"."
)[
0
]
account
:=
strings
.
Split
(
account
,
"."
)[
1
]
if
branch
!=
server
.
BranchName
{
peerAddr
:=
server
.
BranchNameToAddress
[
branch
]
peerEnc
:=
server
.
PeerEncs
[
peerAddr
]
prepareRequest
:=
Request
{
ClientName
:
clientName
,
PeerName
:
server
.
BranchName
,
TimeStamp
:
time
.
Time
{},
Transaction
:
"HANDLECOMMIT"
,
Branch
:
branch
,
Account
:
account
,
Amount
:
0
,
}
// Send PREPARE message to peer server
peerEnc
.
Encode
(
&
prepareRequest
)
}
else
{
prepareRequest
:=
Request
{
ClientName
:
clientName
,
PeerName
:
server
.
BranchName
,
TimeStamp
:
time
.
Time
{},
Transaction
:
"HANDLECOMMIT"
,
Branch
:
branch
,
Account
:
account
,
Amount
:
0
,
}
server
.
handle_transaction
(
prepareRequest
)
}
}
}
}
}
/*
* One per client
*/
func
(
server
*
Server
)
prepare
(
request
Request
)
{
clientName
:=
request
.
ClientName
// Get all affected accounts for this transaction
server
.
Lock
.
Lock
()
affectedAccounts
:=
server
.
ClientsAffected
[
clientName
]
server
.
Lock
.
Unlock
()
// Send PREPARE to peers and wait for responses
for
_
,
account
:=
range
affectedAccounts
{
fmt
.
Println
(
"AFFECTED ACCOUNT"
,
account
)
branch
:=
strings
.
Split
(
account
,
"."
)[
0
]
account
:=
strings
.
Split
(
account
,
"."
)[
1
]
// sending prepare to different branch
if
branch
!=
server
.
BranchName
{
peerAddr
:=
server
.
BranchNameToAddress
[
branch
]
peerEnc
:=
server
.
PeerEncs
[
peerAddr
]
prepareRequest
:=
Request
{
ClientName
:
clientName
,
PeerName
:
server
.
BranchName
,
TimeStamp
:
request
.
TimeStamp
,
Transaction
:
"PREPARE"
,
Branch
:
branch
,
Account
:
account
,
Amount
:
request
.
Amount
,
}
// Send PREPARE message to peer server
peerEnc
.
Encode
(
&
prepareRequest
)
}
else
{
prepareRequest
:=
Request
{
ClientName
:
clientName
,
PeerName
:
server
.
BranchName
,
TimeStamp
:
request
.
TimeStamp
,
Transaction
:
"PREPARE"
,
Branch
:
branch
,
Account
:
account
,
Amount
:
request
.
Amount
,
}
server
.
handle_transaction
(
prepareRequest
)
}
}
}
//////////////////////////////
// HELPER FUNCTIONS
//////////////////////////////
...
...
@@ -312,8 +430,13 @@ func (server *Server) print_all_balances() {
// TIMESTAMP ORDERING AND TRANSACTION HANDLING START
//////////////////////////////
func
(
server
*
Server
)
send_response_to_coordinator
()
{
func
(
server
*
Server
)
send_response_to_client
(
clientName
string
,
result
bool
,
message
string
)
{
fmt
.
Println
(
"SENDING RESPONSE TO CLIENT"
,
clientName
,
result
,
message
,
server
.
Clients
[
clientName
],
server
.
Clients
)
response
:=
Response
{
Result
:
result
,
Message
:
message
}
enc
:=
gob
.
NewEncoder
(
server
.
Clients
[
clientName
])
enc
.
Encode
(
&
response
)
fmt
.
Println
(
"sent"
)
}
func
(
server
*
Server
)
handle_read
(
request
Request
)
{
...
...
@@ -321,8 +444,18 @@ func (server *Server) handle_read(request Request) {
account
,
exists
:=
server
.
Accounts
[
request
.
Account
]
server
.
Lock
.
Unlock
()
if
!
exists
{
if
!
exists
&&
request
.
PeerName
!=
server
.
BranchName
{
fmt
.
Println
(
"ABORT! read on non-existent account"
)
request
.
Transaction
=
"SEND"
request
.
Account
=
"ABORT"
request
.
Amount
=
0
server
.
PeerEncs
[
server
.
BranchNameToAddress
[
request
.
PeerName
]]
.
Encode
(
&
request
)
return
}
else
if
!
exists
&&
request
.
PeerName
==
server
.
BranchName
{
request
.
Transaction
=
"SEND"
request
.
Account
=
"ABORT"
request
.
Amount
=
0
server
.
handle_transaction
(
request
)
return
}
...
...
@@ -337,6 +470,14 @@ func (server *Server) handle_read(request Request) {
// verify that request is greater than write timestamp
if
request
.
TimeStamp
.
Before
(
maxCommitTs
)
||
request
.
TimeStamp
.
Equal
(
maxCommitTs
)
{
fmt
.
Println
(
"ABORT! Read is before a committed write"
)
request
.
Transaction
=
"SEND"
request
.
Account
=
"ABORT"
request
.
Amount
=
0
if
request
.
PeerName
==
server
.
BranchName
{
server
.
handle_transaction
(
request
)
}
else
{
server
.
PeerEncs
[
server
.
BranchNameToAddress
[
request
.
PeerName
]]
.
Encode
(
&
request
)
}
account
.
AccountLock
.
Unlock
()
return
}
...
...
@@ -375,6 +516,14 @@ func (server *Server) handle_read(request Request) {
if
!
alreadyRead
{
account
.
RTS
=
append
(
account
.
RTS
,
request
.
TimeStamp
)
}
request
.
Transaction
=
"SEND"
request
.
Account
=
request
.
Branch
+
"."
+
request
.
Account
+
" = "
+
strconv
.
Itoa
(
value
)
request
.
Amount
=
1
if
request
.
PeerName
==
server
.
BranchName
{
server
.
handle_transaction
(
request
)
}
else
{
server
.
PeerEncs
[
server
.
BranchNameToAddress
[
request
.
PeerName
]]
.
Encode
(
&
request
)
}
fmt
.
Printf
(
"READ COMMITTED VALUE: %s.%s = %d
\n
"
,
request
.
Branch
,
request
.
Account
,
value
)
account
.
AccountLock
.
Unlock
()
return
...
...
@@ -383,6 +532,14 @@ func (server *Server) handle_read(request Request) {
// if Ds is tentative and written by this client, read it
entry
,
writtenByCurrent
:=
account
.
TW
[
request
.
ClientName
]
if
writtenByCurrent
&&
entry
.
Timestamp
.
Equal
(
ds
)
{
request
.
Transaction
=
"SEND"
request
.
Account
=
request
.
Branch
+
"."
+
request
.
Account
+
" = "
+
strconv
.
Itoa
(
value
)
request
.
Amount
=
1
if
request
.
PeerName
==
server
.
BranchName
{
server
.
handle_transaction
(
request
)
}
else
{
server
.
PeerEncs
[
server
.
BranchNameToAddress
[
request
.
PeerName
]]
.
Encode
(
&
request
)
}
fmt
.
Printf
(
"READ OWN TENTATIVE WRITE: %s.%s = %d
\n
"
,
request
.
Branch
,
request
.
Account
,
entry
.
OperationValue
)
account
.
AccountLock
.
Unlock
()
return
...
...
@@ -395,7 +552,7 @@ func (server *Server) handle_read(request Request) {
account
.
AccountLock
.
Lock
()
// Check if Ds is now committed
// Check if Ds is now committed
server.send_response_
isNowCommitted
:=
false
for
_
,
ts
:=
range
account
.
WriteTimestampCommitted
{
if
ts
.
Equal
(
ds
)
{
...
...
@@ -408,6 +565,14 @@ func (server *Server) handle_read(request Request) {
account
.
RTS
=
append
(
account
.
RTS
,
request
.
TimeStamp
)
account
.
AccountLock
.
Unlock
()
fmt
.
Printf
(
"AFTER WAIT, READ COMMITTED: %s.%s = %d
\n
"
,
request
.
Branch
,
request
.
Account
,
value
)
request
.
Transaction
=
"SEND"
request
.
Account
=
request
.
Branch
+
"."
+
request
.
Account
+
" = "
+
strconv
.
Itoa
(
value
)
request
.
Amount
=
1
if
request
.
PeerName
==
server
.
BranchName
{
server
.
handle_transaction
(
request
)
}
else
{
server
.
PeerEncs
[
server
.
BranchNameToAddress
[
request
.
PeerName
]]
.
Encode
(
&
request
)
}
return
}
...
...
@@ -449,7 +614,14 @@ func (server *Server) handle_write(request Request) {
exists
=
true
}
else
if
request
.
Transaction
==
"WITHDRAW"
{
server
.
Lock
.
Unlock
()
fmt
.
Println
(
"ABORT! Withdrawing from non-existent account"
)
request
.
Transaction
=
"SEND"
request
.
Account
=
"ABORT"
request
.
Amount
=
0
if
request
.
PeerName
==
server
.
BranchName
{
server
.
handle_transaction
(
request
)
}
else
{
server
.
PeerEncs
[
server
.
BranchNameToAddress
[
request
.
PeerName
]]
.
Encode
(
&
request
)
}
return
}
}
...
...
@@ -486,50 +658,42 @@ func (server *Server) handle_write(request Request) {
OperationValue
:
value
,
}
}
fmt
.
Printf
(
"Tentative write recorded for %s: %+v
\n
"
,
request
.
Account
,
account
.
TW
[
request
.
ClientName
])
request
.
Transaction
=
"SEND"
request
.
Account
=
""
request
.
Amount
=
1
if
request
.
PeerName
==
server
.
BranchName
{
fmt
.
Println
(
request
.
Branch
,
server
.
BranchName
,
"BRANCHES"
)
server
.
handle_transaction
(
request
)
}
else
{
fmt
.
Println
(
"KABOOM"
)
server
.
PeerEncs
[
server
.
BranchNameToAddress
[
request
.
PeerName
]]
.
Encode
(
&
request
)
}
fmt
.
Printf
(
"Tentative write recorded for %s: %+v
\n
"
,
request
.
Account
,
account
.
TW
[
request
.
ClientName
])
}
else
{
fmt
.
Println
(
"OH NO"
)
request
.
Transaction
=
"SEND"
request
.
Account
=
"ABORT"
request
.
Amount
=
0
if
request
.
PeerName
==
server
.
BranchName
{
server
.
handle_transaction
(
request
)
}
else
{
server
.
PeerEncs
[
server
.
BranchNameToAddress
[
request
.
PeerName
]]
.
Encode
(
&
request
)
}
fmt
.
Println
(
"ABORT! Write condition violated"
)
}
}
func
(
server
*
Server
)
handle_commit
(
request
Request
)
{
server
.
Lock
.
Lock
()
account
,
exists
:=
server
.
Accounts
[
request
.
Account
]
account
:=
server
.
Accounts
[
request
.
Account
]
server
.
Lock
.
Unlock
()
if
!
exists
{
fmt
.
Println
(
"COMMIT: Account does not exist"
,
request
.
Account
)
return
}
account
.
AccountLock
.
Lock
()
entry
,
ok
:=
account
.
TW
[
request
.
ClientName
]
if
!
ok
{
fmt
.
Println
(
"COMMIT: No tentative write found to commit"
)
account
.
AccountLock
.
Unlock
()
return
}
fmt
.
Println
(
"HERE 2"
,
account
.
TW
[
request
.
ClientName
])
// loop until all previous are committed
for
{
prevAllCommitted
:=
true
for
client
,
prevEntry
:=
range
account
.
TW
{
if
client
!=
request
.
ClientName
&&
prevEntry
.
Timestamp
.
Before
(
entry
.
Timestamp
)
{
prevAllCommitted
=
false
break
}
}
if
prevAllCommitted
{
break
}
else
{
account
.
AccountLock
.
Unlock
()
time
.
Sleep
(
100
*
time
.
Millisecond
)
account
.
AccountLock
.
Lock
()
}
}
entry
:=
account
.
TW
[
request
.
ClientName
]
// Apply write
account
.
Balance
+=
entry
.
OperationValue
...
...
@@ -539,13 +703,17 @@ func (server *Server) handle_commit(request Request) {
delete
(
account
.
TW
,
request
.
ClientName
)
fmt
.
Printf
(
"COMMIT: Applied write to %s.%s, new balance: %d
\n
"
,
request
.
Branch
,
request
.
Account
,
account
.
Balance
)
account
.
AccountLock
.
Unlock
()
fmt
.
Println
(
"RTS"
,
account
.
RTS
)
fmt
.
Println
(
"TW"
,
account
.
TW
)
fmt
.
Println
(
"COMMITED"
,
account
.
WriteTimestampCommitted
)
server
.
Lock
.
Lock
()
for
accountName
,
account
:=
range
server
.
Accounts
{
fmt
.
Println
(
server
.
BranchName
+
accountName
,
"="
,
account
.
Balance
,
account
.
RTS
,
account
.
TW
,
account
.
WriteTimestampCommitted
)
}
server
.
Lock
.
Unlock
()
account
.
AccountLock
.
Unlock
()
}
func
(
server
*
Server
)
handle_abort
(
request
Request
)
{
...
...
@@ -580,8 +748,55 @@ func (server *Server) handle_abort(request Request) {
account
.
RTS
=
newRTS
}
func
(
server
*
Server
)
handle_prepare
(
request
Request
)
{
// consistency check
fmt
.
Println
(
"MADE IT HERE WITH REQUEST"
,
request
)
server
.
Lock
.
Lock
()
account
,
exists
:=
server
.
Accounts
[
request
.
Account
]
server
.
Lock
.
Unlock
()
if
!
exists
{
server
.
VoteClientChans
[
request
.
ClientName
]
<-
"ABORT"
return
}
account
.
AccountLock
.
Lock
()
entry
,
ok
:=
account
.
TW
[
request
.
ClientName
]
if
!
ok
{
server
.
VoteClientChans
[
request
.
ClientName
]
<-
"ABORT"
account
.
AccountLock
.
Unlock
()
return
}
// loop until all previous are committed
for
{
prevAllCommitted
:=
true
for
client
,
prevEntry
:=
range
account
.
TW
{
if
client
!=
request
.
ClientName
&&
prevEntry
.
Timestamp
.
Before
(
entry
.
Timestamp
)
{
prevAllCommitted
=
false
break
}
}
if
prevAllCommitted
{
fmt
.
Println
(
"PLACED COMMIT INTO CHANNEL"
,
request
.
ClientName
)
server
.
VoteClientChans
[
request
.
ClientName
]
<-
"COMMIT"
break
}
else
{
account
.
AccountLock
.
Unlock
()
time
.
Sleep
(
100
*
time
.
Millisecond
)
account
.
AccountLock
.
Lock
()
}
}
account
.
AccountLock
.
Unlock
()
}
// handles transaction request from coordinator
func
(
server
*
Server
)
handle_transaction
(
request
Request
)
{
fmt
.
Println
(
"HANDLING TRANSACTION"
,
request
.
Transaction
,
request
.
Branch
+
"."
+
request
.
Account
)
switch
request
.
Transaction
{
case
"BALANCE"
:
server
.
handle_read
(
request
)
...
...
@@ -591,6 +806,14 @@ func (server *Server) handle_transaction(request Request) {
server
.
handle_commit
(
request
)
case
"ABORT"
:
server
.
handle_abort
(
request
)
case
"PREPARE"
:
server
.
handle_prepare
(
request
)
case
"HANDLECOMMIT"
:
request
.
PeerName
=
server
.
BranchName
go
server
.
handle_commit
(
request
)
case
"SEND"
:
fmt
.
Println
(
"PEER"
,
request
.
PeerName
)
go
server
.
send_response_to_client
(
request
.
ClientName
,
request
.
Amount
==
1
,
request
.
Account
)
}
}
...
...
@@ -613,12 +836,16 @@ func main() {
server
.
PeerEncs
=
make
(
map
[
string
]
*
gob
.
Encoder
)
server
.
ClientChan
=
make
(
chan
Request
,
1000
)
server
.
PeerChan
=
make
(
chan
Request
,
1000
)
server
.
ClientsAffected
=
make
(
map
[
string
][]
string
)
server
.
VoteClientChans
=
make
(
map
[
string
]
chan
string
)
server
.
read_file
(
configPath
)
// start coordinator server
go
server
.
run_coordinator
()
go
server
.
listen_to_clients
()
// start peer server
go
server
.
run_server
()
go
server
.
listen_to_peers
()
go
server
.
connect_to_peers
()
...
...
This diff is collapsed.
Click to expand it.
mp3/config_test.txt
+
2
−
1
View file @
7f05e84b
A 127.0.0.1 2005
\ No newline at end of file
A 127.0.0.1 2005
B 127.0.0.1 2006
\ No newline at end of file
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