class Corpshort::Backends::Redis
Attributes
prefix[R]
Public Class Methods
new(redis: ::Redis.method(:current), prefix: "corpshort:")
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# File lib/corpshort/backends/redis.rb, line 10 def initialize(redis: ::Redis.method(:current), prefix: "corpshort:") @redis = redis @prefix = prefix end
Public Instance Methods
delete_link(link)
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# File lib/corpshort/backends/redis.rb, line 50 def delete_link(link) key = link_key(link) redis.watch(key) do url = redis.hget(key, 'url') link_url_key = url_key(url) redis.multi do |m| m.zrem(links_key, link) m.zrem(link_url_key, link) m.del(key) end end end
get_link(name)
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# File lib/corpshort/backends/redis.rb, line 41 def get_link(name) data = redis.hgetall(link_key(name)) if data && !data.empty? Link.new(data, backend: self) else nil end end
list_links(token: nil, limit: 30)
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# File lib/corpshort/backends/redis.rb, line 87 def list_links(token: nil, limit: 30) names = if token redis.zrevrangebyscore(links_key, "(#{token}", '-inf', limit: [0, limit], with_scores: true) else redis.zrevrangebyscore(links_key, '+inf', '-inf', limit: [0, limit], with_scores: true) end [names.map(&:first), names[-1]&.last] end
list_links_by_url(url)
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# File lib/corpshort/backends/redis.rb, line 83 def list_links_by_url(url) redis.zrevrangebyscore(url_key(url), '+inf', '-inf') end
put_link(link, create_only: false)
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# File lib/corpshort/backends/redis.rb, line 17 def put_link(link, create_only: false) key = link_key(link) redis.watch(key) do old_url = redis.hget(key, 'url') if create_only && old_url redis.unwatch(key) raise ConflictError, "#{link.name} already exists" end redis.multi do |m| m.del(key) m.mapped_hmset(key, link.as_json) m.zadd(links_key, link.updated_at.to_i, link.name) if old_url && link.url != old_url m.zrem(url_key(old_url), link.name) end m.zadd(url_key(link.url), link.updated_at.to_i, link.name) end end end
redis()
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# File lib/corpshort/backends/redis.rb, line 97 def redis Thread.current[redis_thread_key] ||= @redis.call end
rename_link(link, new_name)
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# File lib/corpshort/backends/redis.rb, line 64 def rename_link(link, new_name) link_key = link_key(link) new_key = link_key(new_name) redis.watch(link_key) do url = redis.hget(link_key, 'url') link_url_key = url_key(url) redis.multi do |m| m.renamenx(link_key, new_key) m.hset(new_key, 'name', new_name) m.zrem(links_key, link.name) m.zadd(links_key, link.updated_at.to_i, new_name) m.zrem(link_url_key, link.name) m.zadd(link_url_key, link.updated_at.to_i, new_name) end end end
Private Instance Methods
link_key(link)
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# File lib/corpshort/backends/redis.rb, line 111 def link_key(link) name = link.is_a?(String) ? link : link.name "#{@prefix}link:#{name}" end
links_key()
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# File lib/corpshort/backends/redis.rb, line 107 def links_key "#{@prefix}links" end
redis_thread_key()
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# File lib/corpshort/backends/redis.rb, line 116 def redis_thread_key @redis_thread_key ||= :"corpshort_backend_redis_#{self.__id__}" end
url_key(url)
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# File lib/corpshort/backends/redis.rb, line 103 def url_key(url) "#{@prefix}url:#{Digest::SHA384.hexdigest(url)}" end