mirror of
https://github.com/ethereum/go-ethereum.git
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6807d4d2ed
Implement intervals for stream Client. Change the Subscribe message handling to create both live and history streams if required.
84 lines
2.3 KiB
Go
84 lines
2.3 KiB
Go
// Copyright 2018 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 intervals TODO: implement LevelDB based Store.
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package intervals
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import (
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"errors"
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"sync"
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)
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// ErrNotFound is returned by the Store implementation when the Interval
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// for a specific key does not exist.
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var ErrNotFound = errors.New("not found")
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// Store defines methods required to get and retrieve Intervals for different keys.
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// It is meant to be used for intervals persistance for different streams in the
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// stream package.
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type Store interface {
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Get(key string) (i *Intervals, err error)
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Put(key string, i *Intervals) (err error)
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Delete(key string) (err error)
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}
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// MemStore is the reference implementation of Store interface that is supposed
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// to be used in tests.
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type MemStore struct {
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db map[string]*Intervals
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mu sync.RWMutex
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}
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// NewMemStore returns a new instance of MemStore.
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func NewMemStore() *MemStore {
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return &MemStore{
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db: make(map[string]*Intervals),
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}
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}
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// Get retrieves Intervals for a specific key. If there is no Intervals
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// ErrNotFound is returned.
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func (s *MemStore) Get(key string) (i *Intervals, err error) {
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s.mu.RLock()
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defer s.mu.RUnlock()
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i, ok := s.db[key]
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if !ok {
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return nil, ErrNotFound
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}
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return i, nil
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}
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// Put stores Intervals for a specific key.
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func (s *MemStore) Put(key string, i *Intervals) (err error) {
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s.mu.Lock()
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defer s.mu.Unlock()
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s.db[key] = i
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return nil
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}
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// Delete removes Intervals stored under a specific key.
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func (s *MemStore) Delete(key string) (err error) {
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s.mu.Lock()
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defer s.mu.Unlock()
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if _, ok := s.db[key]; !ok {
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return ErrNotFound
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}
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delete(s.db, key)
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return nil
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}
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