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bor
Commits
e47230f8
Commit
e47230f8
authored
Jan 20, 2014
by
Jeffrey Wilcke
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Transaction processing. Implemented sending and receiving wei
parent
f6b54c38
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transaction_pool.go
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e47230f8
package
main
import
(
"container/list"
"errors"
"github.com/ethereum/ethutil-go"
"log"
"math/big"
"sync"
)
const
(
txPoolQueueSize
=
50
)
func
FindTx
(
pool
*
list
.
List
,
finder
func
(
*
ethutil
.
Transaction
,
*
list
.
Element
)
bool
)
*
ethutil
.
Transaction
{
for
e
:=
pool
.
Front
();
e
!=
nil
;
e
=
e
.
Next
()
{
if
tx
,
ok
:=
e
.
Value
.
(
*
ethutil
.
Transaction
);
ok
{
if
finder
(
tx
,
e
)
{
return
tx
}
}
}
return
nil
}
// The tx pool a thread safe transaction pool handler. In order to
// guarantee a non blocking pool we use a queue channel which can be
// independently read without needing access to the actual pool. If the
// pool is being drained or synced for whatever reason the transactions
// will simple queue up and handled when the mutex is freed.
type
TxPool
struct
{
server
*
Server
// The mutex for accessing the Tx pool.
mutex
sync
.
Mutex
// Queueing channel for reading and writing incoming
// transactions to
queueChan
chan
*
ethutil
.
Transaction
// Quiting channel
quit
chan
bool
pool
*
list
.
List
}
func
NewTxPool
(
s
*
Server
)
*
TxPool
{
return
&
TxPool
{
server
:
s
,
mutex
:
sync
.
Mutex
{},
pool
:
list
.
New
(),
queueChan
:
make
(
chan
*
ethutil
.
Transaction
,
txPoolQueueSize
),
quit
:
make
(
chan
bool
),
}
}
// Blocking function. Don't use directly. Use QueueTransaction instead
func
(
pool
*
TxPool
)
addTransaction
(
tx
*
ethutil
.
Transaction
)
{
pool
.
mutex
.
Lock
()
defer
pool
.
mutex
.
Unlock
()
pool
.
pool
.
PushBack
(
tx
)
}
// Process transaction validates the Tx and processes funds from the
// sender to the recipient.
func
(
pool
*
TxPool
)
processTransaction
(
tx
*
ethutil
.
Transaction
)
error
{
// Get the last block so we can retrieve the sender and receiver from
// the merkle trie
block
:=
pool
.
server
.
blockManager
.
bc
.
LastBlock
// Something has gone horribly wrong if this happens
if
block
==
nil
{
return
errors
.
New
(
"No last block on the block chain"
)
}
var
sender
,
receiver
*
ethutil
.
Ether
// Get the sender
data
:=
block
.
State
()
.
Get
(
string
(
tx
.
Sender
()))
// If it doesn't exist create a new account. Of course trying to send funds
// from this account will fail since it will hold 0 Wei
if
data
==
""
{
sender
=
ethutil
.
NewEther
(
big
.
NewInt
(
0
))
}
else
{
sender
=
ethutil
.
NewEtherFromData
([]
byte
(
data
))
}
// Defer the update. Whatever happens it should be persisted
defer
block
.
State
()
.
Update
(
string
(
tx
.
Sender
()),
string
(
sender
.
RlpEncode
()))
// Make sure there's enough in the sender's account. Having insufficient
// funds won't invalidate this transaction but simple ignores it.
if
sender
.
Amount
.
Cmp
(
tx
.
Value
)
<
0
{
return
errors
.
New
(
"Insufficient amount in sender's account"
)
}
// Subtract the amount from the senders account
sender
.
Amount
.
Sub
(
sender
.
Amount
,
tx
.
Value
)
// Increment the nonce making each tx valid only once to prevent replay
// attacks
sender
.
Nonce
+=
1
// Get the receiver
data
=
block
.
State
()
.
Get
(
tx
.
Recipient
)
// If the receiver doesn't exist yet, create a new account to which the
// funds will be send.
if
data
==
""
{
receiver
=
ethutil
.
NewEther
(
big
.
NewInt
(
0
))
}
else
{
receiver
=
ethutil
.
NewEtherFromData
([]
byte
(
data
))
}
// Defer the update
defer
block
.
State
()
.
Update
(
tx
.
Recipient
,
string
(
receiver
.
RlpEncode
()))
// Add the amount to receivers account which should conclude this transaction
receiver
.
Amount
.
Add
(
receiver
.
Amount
,
tx
.
Value
)
return
nil
}
func
(
pool
*
TxPool
)
queueHandler
()
{
out
:
for
{
select
{
case
tx
:=
<-
pool
.
queueChan
:
// Process the transaction
err
:=
pool
.
processTransaction
(
tx
)
if
err
!=
nil
{
log
.
Println
(
"Error processing Tx"
,
err
)
}
else
{
// Call blocking version. At this point it
// doesn't matter since this is a goroutine
pool
.
addTransaction
(
tx
)
}
case
<-
pool
.
quit
:
break
out
}
}
}
func
(
pool
*
TxPool
)
QueueTransaction
(
tx
*
ethutil
.
Transaction
)
{
pool
.
queueChan
<-
tx
}
func
(
pool
*
TxPool
)
Flush
()
{
pool
.
mutex
.
Lock
()
defer
pool
.
mutex
.
Unlock
()
pool
.
mutex
.
Unlock
()
}
func
(
pool
*
TxPool
)
Start
()
{
go
pool
.
queueHandler
()
}
func
(
pool
*
TxPool
)
Stop
()
{
log
.
Println
(
"[TXP] Stopping..."
)
close
(
pool
.
quit
)
pool
.
Flush
()
}
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