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core, event/filter, xeth: refactored filter system
Moved the filtering system from `event` to `eth/filters` package and removed the `core.Filter` object. The `filters.Filter` object now requires a `common.Database` rather than a `eth.Backend` and invokes the `core.GetBlockByX` directly rather than thru a "manager".
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,133 @@ | ||
| // Copyright 2014 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/>. | ||
|
|
||
| // package filters implements an ethereum filtering system for block, | ||
| // transactions and log events. | ||
| package filters | ||
|
|
||
| import ( | ||
| "sync" | ||
|
|
||
| "github.com/ethereum/go-ethereum/core" | ||
| "github.com/ethereum/go-ethereum/core/state" | ||
| "github.com/ethereum/go-ethereum/event" | ||
| ) | ||
|
|
||
| // FilterSystem manages filters that filter specific events such as | ||
| // block, transaction and log events. The Filtering system can be used to listen | ||
| // for specific LOG events fires by the EVM (Ethereum Virtual Machine). | ||
| type FilterSystem struct { | ||
| eventMux *event.TypeMux | ||
|
|
||
| filterMu sync.RWMutex | ||
| filterId int | ||
| filters map[int]*Filter | ||
|
|
||
| quit chan struct{} | ||
| } | ||
|
|
||
| // NewFilterSystem returns a newly allocated filter manager | ||
| func NewFilterSystem(mux *event.TypeMux) *FilterSystem { | ||
| fs := &FilterSystem{ | ||
| eventMux: mux, | ||
| filters: make(map[int]*Filter), | ||
| } | ||
| go fs.filterLoop() | ||
| return fs | ||
| } | ||
|
|
||
| // Stop quits the filter loop required for polling events | ||
| func (fs *FilterSystem) Stop() { | ||
| close(fs.quit) | ||
| } | ||
|
|
||
| // Add adds a filter to the filter manager | ||
| func (fs *FilterSystem) Add(filter *Filter) (id int) { | ||
| fs.filterMu.Lock() | ||
| defer fs.filterMu.Unlock() | ||
| id = fs.filterId | ||
| fs.filters[id] = filter | ||
| fs.filterId++ | ||
|
|
||
| return id | ||
| } | ||
|
|
||
| // Remove removes a filter by filter id | ||
| func (fs *FilterSystem) Remove(id int) { | ||
| fs.filterMu.Lock() | ||
| defer fs.filterMu.Unlock() | ||
| if _, ok := fs.filters[id]; ok { | ||
| delete(fs.filters, id) | ||
| } | ||
| } | ||
|
|
||
| // Get retrieves a filter installed using Add The filter may not be modified. | ||
| func (fs *FilterSystem) Get(id int) *Filter { | ||
| fs.filterMu.RLock() | ||
| defer fs.filterMu.RUnlock() | ||
| return fs.filters[id] | ||
| } | ||
|
|
||
| // filterLoop waits for specific events from ethereum and fires their handlers | ||
| // when the filter matches the requirements. | ||
| func (fs *FilterSystem) filterLoop() { | ||
| // Subscribe to events | ||
| events := fs.eventMux.Subscribe( | ||
| //core.PendingBlockEvent{}, | ||
| core.ChainEvent{}, | ||
| core.TxPreEvent{}, | ||
| state.Logs(nil)) | ||
|
|
||
| out: | ||
| for { | ||
| select { | ||
| case <-fs.quit: | ||
| break out | ||
| case event := <-events.Chan(): | ||
| switch event := event.(type) { | ||
| case core.ChainEvent: | ||
| fs.filterMu.RLock() | ||
| for _, filter := range fs.filters { | ||
| if filter.BlockCallback != nil { | ||
| filter.BlockCallback(event.Block, event.Logs) | ||
| } | ||
| } | ||
| fs.filterMu.RUnlock() | ||
|
|
||
| case core.TxPreEvent: | ||
| fs.filterMu.RLock() | ||
| for _, filter := range fs.filters { | ||
| if filter.TransactionCallback != nil { | ||
| filter.TransactionCallback(event.Tx) | ||
| } | ||
| } | ||
| fs.filterMu.RUnlock() | ||
|
|
||
| case state.Logs: | ||
| fs.filterMu.RLock() | ||
| for _, filter := range fs.filters { | ||
| if filter.LogsCallback != nil { | ||
| msgs := filter.FilterLogs(event) | ||
| if len(msgs) > 0 { | ||
| filter.LogsCallback(msgs) | ||
| } | ||
| } | ||
| } | ||
| fs.filterMu.RUnlock() | ||
| } | ||
| } | ||
| } | ||
| } |
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