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85 lines
2.6 KiB
85 lines
2.6 KiB
require 'zlib'
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class EmbedRedisCache
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include ::LoggerHelper
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# This needs to be changed whenever there're changes in the code that require invalidation of old keys
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VERSION = '4'
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def initialize(redis_cache = $tables_metadata)
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@redis = redis_cache
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end
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def get(visualization_id, https_request)
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key = key(visualization_id, https_request)
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value = redis.get(key)
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value.present? ? JSON.parse(value, symbolize_names: true) : nil
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rescue StandardError => exception
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# Captures:
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# - Redis::BaseError if redis is down
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# - IO errors due to deploys changing physical path (see read_frontend_version / calculate_embed_template_hash)
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log_error(exception: exception)
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nil
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end
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# Only public and public with link
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def set(visualization_id, https_request, response_headers, response_body)
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serialized = JSON.generate(headers: response_headers,
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body: response_body
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)
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redis.setex(key(visualization_id, https_request), 24.hours.to_i, serialized)
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rescue StandardError => exception
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# Captures:
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# - Redis::BaseError if redis is down
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# - IO errors due to deploys changing physical path (see read_frontend_version / calculate_embed_template_hash)
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log_error(exception: exception)
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nil
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end
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def invalidate(visualization_id)
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redis.del [key(visualization_id, true), key(visualization_id, false)]
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rescue StandardError => exception
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# Captures:
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# - Redis::BaseError if redis is down
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# - IO errors due to deploys changing physical path (see read_frontend_version / calculate_embed_template_hash)
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log_error(exception: exception)
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nil
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end
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def key(visualization_id, https_request = false)
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protocol = https_request ? 'https' : 'http'
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[
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"vis",
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visualization_id,
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"embed",
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protocol,
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VERSION,
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CartoDB::Application.frontend_version,
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embed_template_hash
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].join(":")
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end
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def purge(vizs)
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return unless vizs.count > 0
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keys = vizs.map { |v| [key(v.id, false), key(v.id, true)] }.flatten
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redis.del keys
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end
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private
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def embed_template_hash
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# INFO: New deploys restart the server, invalidating this value + we want to hit disk as less as possible
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@@key_fragment_embed_template_hash ||= calculate_embed_template_hash
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end
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def calculate_embed_template_hash
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# The alternative Adler-32 is not as reliable as CRC32
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# and even less with inputs of "few hundred bytes" as is this case
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Zlib::crc32(File.read(Rails.root.join("app/views/admin/visualizations/embed_map.html.erb")))
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end
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def redis
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@redis
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end
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end
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