Created
March 22, 2011 21:06
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the simplest Redis caching for Sinatra -- not even tested... consider this code just an hint
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| Username = <%= @var %> |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Sinatra Redis Cache Example</title> | |
| </head> | |
| <body> | |
| <%= yield %> | |
| </body> | |
| </html> |
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| # This is just an hint for a simple Redis caching "framework" using Sinatra | |
| # A friend of mine asked for something like that, after checking the first two gems realized there was | |
| # a lot of useless complexity (IMHO). That's the result. | |
| # | |
| # The use_cache parameter is useful if you want to cache only if the user is authenticated or | |
| # something like that, so you can do cache_url(ttl,User.logged_in?, ...) | |
| require 'rubygems' | |
| require 'sinatra' | |
| require 'redis' | |
| def cache(tag,ttl,use_cache,block) | |
| if !use_cache | |
| return yield | |
| end | |
| page = $rediscache.get(tag) | |
| return page if page | |
| page = block.call | |
| $rediscache.setex(tag,ttl,page) | |
| return page | |
| end | |
| def cache_url(ttl=300,use_cache=true,&block) | |
| cache("url:#{request.url}",ttl,use_cache,block) | |
| end | |
| # The following is an idea for fragment caching. | |
| def cache_func(ttl=300,use_cache=true,&block) | |
| cache("func:#{request.url}",ttl,use_cache,block) | |
| end | |
| # And for invalidation of course | |
| def cache_func_invalidate(tag) | |
| $rediscache.del("func:#{tag}") | |
| end | |
| before do | |
| $rediscache = Redis.new | |
| end | |
| get '/foo/:username' do | |
| @var = "Hello #{params[:username]}" | |
| cache_url(10,true) {erb :index} | |
| end |
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