mirror of https://github.com/ethereum/go-ethereum
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".pull/1756/head
Jeffrey Wilcke
9 years ago
parent
0d78f96205
commit
f7a71996fb
@ -0,0 +1,133 @@ |
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// Copyright 2014 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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// package filters implements an ethereum filtering system for block,
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// transactions and log events.
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package filters |
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import ( |
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"sync" |
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"github.com/ethereum/go-ethereum/core" |
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"github.com/ethereum/go-ethereum/core/state" |
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"github.com/ethereum/go-ethereum/event" |
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) |
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// FilterSystem manages filters that filter specific events such as
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// block, transaction and log events. The Filtering system can be used to listen
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// for specific LOG events fires by the EVM (Ethereum Virtual Machine).
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type FilterSystem struct { |
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eventMux *event.TypeMux |
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filterMu sync.RWMutex |
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filterId int |
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filters map[int]*Filter |
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quit chan struct{} |
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} |
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// NewFilterSystem returns a newly allocated filter manager
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func NewFilterSystem(mux *event.TypeMux) *FilterSystem { |
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fs := &FilterSystem{ |
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eventMux: mux, |
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filters: make(map[int]*Filter), |
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} |
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go fs.filterLoop() |
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return fs |
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} |
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// Stop quits the filter loop required for polling events
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func (fs *FilterSystem) Stop() { |
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close(fs.quit) |
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} |
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// Add adds a filter to the filter manager
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func (fs *FilterSystem) Add(filter *Filter) (id int) { |
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fs.filterMu.Lock() |
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defer fs.filterMu.Unlock() |
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id = fs.filterId |
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fs.filters[id] = filter |
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fs.filterId++ |
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return id |
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} |
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// Remove removes a filter by filter id
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func (fs *FilterSystem) Remove(id int) { |
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fs.filterMu.Lock() |
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defer fs.filterMu.Unlock() |
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if _, ok := fs.filters[id]; ok { |
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delete(fs.filters, id) |
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} |
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} |
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// Get retrieves a filter installed using Add The filter may not be modified.
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func (fs *FilterSystem) Get(id int) *Filter { |
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fs.filterMu.RLock() |
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defer fs.filterMu.RUnlock() |
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return fs.filters[id] |
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} |
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// filterLoop waits for specific events from ethereum and fires their handlers
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// when the filter matches the requirements.
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func (fs *FilterSystem) filterLoop() { |
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// Subscribe to events
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events := fs.eventMux.Subscribe( |
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//core.PendingBlockEvent{},
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core.ChainEvent{}, |
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core.TxPreEvent{}, |
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state.Logs(nil)) |
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out: |
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for { |
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select { |
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case <-fs.quit: |
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break out |
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case event := <-events.Chan(): |
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switch event := event.(type) { |
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case core.ChainEvent: |
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fs.filterMu.RLock() |
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for _, filter := range fs.filters { |
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if filter.BlockCallback != nil { |
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filter.BlockCallback(event.Block, event.Logs) |
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} |
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} |
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fs.filterMu.RUnlock() |
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case core.TxPreEvent: |
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fs.filterMu.RLock() |
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for _, filter := range fs.filters { |
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if filter.TransactionCallback != nil { |
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filter.TransactionCallback(event.Tx) |
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} |
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} |
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fs.filterMu.RUnlock() |
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case state.Logs: |
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fs.filterMu.RLock() |
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for _, filter := range fs.filters { |
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if filter.LogsCallback != nil { |
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msgs := filter.FilterLogs(event) |
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if len(msgs) > 0 { |
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filter.LogsCallback(msgs) |
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} |
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} |
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} |
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fs.filterMu.RUnlock() |
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} |
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} |
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} |
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} |
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@ -1,127 +0,0 @@ |
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// Copyright 2014 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
|
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package filter |
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// TODO make use of the generic filtering system
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import ( |
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"sync" |
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"github.com/ethereum/go-ethereum/core" |
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"github.com/ethereum/go-ethereum/core/state" |
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"github.com/ethereum/go-ethereum/event" |
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) |
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type FilterManager struct { |
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eventMux *event.TypeMux |
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filterMu sync.RWMutex |
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filterId int |
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filters map[int]*core.Filter |
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quit chan struct{} |
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} |
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func NewFilterManager(mux *event.TypeMux) *FilterManager { |
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return &FilterManager{ |
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eventMux: mux, |
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filters: make(map[int]*core.Filter), |
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} |
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} |
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func (self *FilterManager) Start() { |
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go self.filterLoop() |
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} |
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func (self *FilterManager) Stop() { |
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close(self.quit) |
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} |
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func (self *FilterManager) InstallFilter(filter *core.Filter) (id int) { |
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self.filterMu.Lock() |
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defer self.filterMu.Unlock() |
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id = self.filterId |
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self.filters[id] = filter |
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self.filterId++ |
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return id |
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} |
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func (self *FilterManager) UninstallFilter(id int) { |
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self.filterMu.Lock() |
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defer self.filterMu.Unlock() |
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if _, ok := self.filters[id]; ok { |
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delete(self.filters, id) |
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} |
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} |
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// GetFilter retrieves a filter installed using InstallFilter.
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// The filter may not be modified.
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func (self *FilterManager) GetFilter(id int) *core.Filter { |
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self.filterMu.RLock() |
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defer self.filterMu.RUnlock() |
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return self.filters[id] |
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} |
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func (self *FilterManager) filterLoop() { |
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// Subscribe to events
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events := self.eventMux.Subscribe( |
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//core.PendingBlockEvent{},
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core.ChainEvent{}, |
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core.TxPreEvent{}, |
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state.Logs(nil)) |
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out: |
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for { |
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select { |
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case <-self.quit: |
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break out |
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case event := <-events.Chan(): |
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switch event := event.(type) { |
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case core.ChainEvent: |
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self.filterMu.RLock() |
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for _, filter := range self.filters { |
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if filter.BlockCallback != nil { |
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filter.BlockCallback(event.Block, event.Logs) |
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} |
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} |
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self.filterMu.RUnlock() |
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case core.TxPreEvent: |
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self.filterMu.RLock() |
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for _, filter := range self.filters { |
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if filter.TransactionCallback != nil { |
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filter.TransactionCallback(event.Tx) |
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} |
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} |
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self.filterMu.RUnlock() |
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case state.Logs: |
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self.filterMu.RLock() |
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for _, filter := range self.filters { |
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if filter.LogsCallback != nil { |
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msgs := filter.FilterLogs(event) |
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if len(msgs) > 0 { |
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filter.LogsCallback(msgs) |
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} |
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} |
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} |
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self.filterMu.RUnlock() |
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} |
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} |
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} |
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} |
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