forked from macaron/cache
123 lines
3.6 KiB
Go
123 lines
3.6 KiB
Go
// Copyright 2013 Beego Authors
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// Copyright 2014 The Macaron Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"): you may
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// not use this file except in compliance with the License. You may obtain
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// a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations
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// under the License.
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// Package cache is a middleware that provides the cache management of Macaron.
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package cache
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import (
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"fmt"
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"gopkg.in/macaron.v1"
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)
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const _VERSION = "0.3.0"
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func Version() string {
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return _VERSION
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}
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// Cache is the interface that operates the cache data.
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type Cache interface {
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// Put puts value into cache with key and expire time.
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Put(key string, val interface{}, timeout int64) error
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// Get gets cached value by given key.
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Get(key string) interface{}
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// Delete deletes cached value by given key.
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Delete(key string) error
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// Incr increases cached int-type value by given key as a counter.
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Incr(key string) error
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// Decr decreases cached int-type value by given key as a counter.
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Decr(key string) error
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// IsExist returns true if cached value exists.
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IsExist(key string) bool
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// Flush deletes all cached data.
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Flush() error
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// StartAndGC starts GC routine based on config string settings.
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StartAndGC(opt Options) error
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}
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// Options represents a struct for specifying configuration options for the cache middleware.
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type Options struct {
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// Name of adapter. Default is "memory".
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Adapter string
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// Adapter configuration, it's corresponding to adapter.
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AdapterConfig string
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// GC interval time in seconds. Default is 60.
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Interval int
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// Occupy entire database. Default is false.
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OccupyMode bool
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// Configuration section name. Default is "cache".
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Section string
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}
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func prepareOptions(options []Options) Options {
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var opt Options
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if len(options) > 0 {
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opt = options[0]
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}
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if len(opt.Section) == 0 {
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opt.Section = "cache"
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}
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sec := macaron.Config().Section(opt.Section)
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if len(opt.Adapter) == 0 {
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opt.Adapter = sec.Key("ADAPTER").MustString("memory")
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}
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if opt.Interval == 0 {
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opt.Interval = sec.Key("INTERVAL").MustInt(60)
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}
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if len(opt.AdapterConfig) == 0 {
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opt.AdapterConfig = sec.Key("ADAPTER_CONFIG").MustString("data/caches")
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}
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return opt
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}
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// NewCacher creates and returns a new cacher by given adapter name and configuration.
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// It panics when given adapter isn't registered and starts GC automatically.
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func NewCacher(name string, opt Options) (Cache, error) {
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adapter, ok := adapters[name]
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if !ok {
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return nil, fmt.Errorf("cache: unknown adapter '%s'(forgot to import?)", name)
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}
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return adapter, adapter.StartAndGC(opt)
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}
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// Cacher is a middleware that maps a cache.Cache service into the Macaron handler chain.
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// An single variadic cache.Options struct can be optionally provided to configure.
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func Cacher(options ...Options) macaron.Handler {
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opt := prepareOptions(options)
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cache, err := NewCacher(opt.Adapter, opt)
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if err != nil {
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panic(err)
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}
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return func(ctx *macaron.Context) {
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ctx.Map(cache)
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}
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}
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var adapters = make(map[string]Cache)
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// Register registers a adapter.
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func Register(name string, adapter Cache) {
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if adapter == nil {
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panic("cache: cannot register adapter with nil value")
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}
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if _, dup := adapters[name]; dup {
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panic(fmt.Errorf("cache: cannot register adapter '%s' twice", name))
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}
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adapters[name] = adapter
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}
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