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core: separate transaction journal from pool
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,150 @@ | ||
| // Copyright 2017 The go-ethereum Authors | ||
| // This file is part of the go-ethereum library. | ||
| // | ||
| // The go-ethereum library is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU Lesser General Public License as published by | ||
| // the Free Software Foundation, either version 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // The go-ethereum library is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU Lesser General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU Lesser General Public License | ||
| // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. | ||
|
|
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| package core | ||
|
|
||
| import ( | ||
| "errors" | ||
| "io" | ||
| "os" | ||
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| "github.com/ethereum/go-ethereum/common" | ||
| "github.com/ethereum/go-ethereum/core/types" | ||
| "github.com/ethereum/go-ethereum/log" | ||
| "github.com/ethereum/go-ethereum/rlp" | ||
| ) | ||
|
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| // errNoActiveJournal is returned if a transaction is attempted to be inserted | ||
| // into the journal, but no such file is currently open. | ||
| var errNoActiveJournal = errors.New("no active journal") | ||
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| // txJournal is a rotating log of transactions with the aim of storing locally | ||
| // created transactions to allow non-executed ones to survive node restarts. | ||
| type txJournal struct { | ||
| path string // Filesystem path to store the transactions at | ||
| writer io.WriteCloser // Output stream to write new transactions into | ||
| } | ||
|
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| // newTxJournal creates a new transaction journal to | ||
| func newTxJournal(path string) *txJournal { | ||
| return &txJournal{ | ||
| path: path, | ||
| } | ||
| } | ||
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| // load parses a transaction journal dump from disk, loading its contents into | ||
| // the specified pool. | ||
| func (journal *txJournal) load(add func(*types.Transaction) error) error { | ||
| // Skip the parsing if the journal file doens't exist at all | ||
| if _, err := os.Stat(journal.path); os.IsNotExist(err) { | ||
| return nil | ||
| } | ||
| // Open the journal for loading any past transactions | ||
| input, err := os.Open(journal.path) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer input.Close() | ||
|
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| // Inject all transactions from the journal into the pool | ||
| stream := rlp.NewStream(input, 0) | ||
| total, dropped := 0, 0 | ||
|
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| var failure error | ||
| for { | ||
| // Parse the next transaction and terminate on error | ||
| tx := new(types.Transaction) | ||
| if err = stream.Decode(tx); err != nil { | ||
| if err != io.EOF { | ||
| failure = err | ||
| } | ||
| break | ||
| } | ||
| // Import the transaction and bump the appropriate progress counters | ||
| total++ | ||
| if err = add(tx); err != nil { | ||
| log.Debug("Failed to add journaled transaction", "err", err) | ||
| dropped++ | ||
| continue | ||
| } | ||
| } | ||
| log.Info("Loaded local transaction journal", "transactions", total, "dropped", dropped) | ||
|
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| return failure | ||
| } | ||
|
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| // insert adds the specified transaction to the local disk journal. | ||
| func (journal *txJournal) insert(tx *types.Transaction) error { | ||
| if journal.writer == nil { | ||
| return errNoActiveJournal | ||
| } | ||
| if err := rlp.Encode(journal.writer, tx); err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } | ||
|
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| // rotate regenerates the transaction journal based on the current contents of | ||
| // the transaction pool. | ||
| func (journal *txJournal) rotate(all map[common.Address]types.Transactions) error { | ||
| // Close the current journal (if any is open) | ||
| if journal.writer != nil { | ||
| if err := journal.writer.Close(); err != nil { | ||
| return err | ||
| } | ||
| journal.writer = nil | ||
| } | ||
| // Generate a new journal with the contents of the current pool | ||
| replacement, err := os.OpenFile(journal.path+".new", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0755) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| journaled := 0 | ||
| for _, txs := range all { | ||
| for _, tx := range txs { | ||
| if err = rlp.Encode(replacement, tx); err != nil { | ||
| replacement.Close() | ||
| return err | ||
| } | ||
| } | ||
| journaled += len(txs) | ||
| } | ||
| replacement.Close() | ||
|
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| // Replace the live journal with the newly generated one | ||
| if err = os.Rename(journal.path+".new", journal.path); err != nil { | ||
| return err | ||
| } | ||
| sink, err := os.OpenFile(journal.path, os.O_WRONLY|os.O_APPEND, 0755) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| journal.writer = sink | ||
| log.Info("Regenerated local transaction journal", "transactions", journaled, "accounts", len(all)) | ||
|
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| return nil | ||
| } | ||
|
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| // close flushes the transaction journal contents to disk and closes the file. | ||
| func (journal *txJournal) close() error { | ||
| var err error | ||
|
|
||
| if journal.writer != nil { | ||
| err = journal.writer.Close() | ||
| journal.writer = nil | ||
| } | ||
| return err | ||
| } |
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