Class: Hedra::Cache

Inherits:
Object
  • Object
show all
Defined in:
lib/hedra/cache.rb

Overview

Simple file-based cache for HTTP responses

Constant Summary collapse

DEFAULT_TTL =

1 hour

3600
MAX_CACHE_SIZE =

Maximum number of cache files

1000

Instance Method Summary collapse

Constructor Details

#initialize(cache_dir: nil, ttl: DEFAULT_TTL, verbose: false) ⇒ Cache

Returns a new instance of Cache.



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# File 'lib/hedra/cache.rb', line 13

def initialize(cache_dir: nil, ttl: DEFAULT_TTL, verbose: false)
  @cache_dir = cache_dir || File.join(Config::CONFIG_DIR, 'cache')
  @ttl = ttl
  @verbose = verbose
  FileUtils.mkdir_p(@cache_dir)
  cleanup_if_needed
end

Instance Method Details

#clear ⇒ Object 



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# File 'lib/hedra/cache.rb', line 58

def clear
  FileUtils.rm_rf(@cache_dir)
  FileUtils.mkdir_p(@cache_dir)
end

#clear_expired ⇒ Object 



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# File 'lib/hedra/cache.rb', line 63

def clear_expired
  Dir.glob(File.join(@cache_dir, '*')).each do |file|
    data = JSON.parse(File.read(file))
    File.delete(file) if expired?(data['timestamp'])
  rescue StandardError
    # Skip invalid cache files
  end
end

#get(key) ⇒ Object 



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# File 'lib/hedra/cache.rb', line 21

def get(key)
  cache_file = cache_path(key)
  return nil unless File.exist?(cache_file)

  data = JSON.parse(File.read(cache_file))
  
  if expired?(data['timestamp'])
    File.delete(cache_file) # Clean up expired file immediately
    return nil
  end

  data['value']
rescue JSON::ParserError
  # Corrupted cache file, delete it
  File.delete(cache_file) if File.exist?(cache_file)
  nil
rescue StandardError => e
  warn "Cache read error: #{e.message}" if @verbose
  nil
end

#set(key, value) ⇒ Object 



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# File 'lib/hedra/cache.rb', line 42

def set(key, value)
  cache_file = cache_path(key)
  data = {
    'timestamp' => Time.now.to_i,
    'value' => value
  }
  
  # Atomic write to prevent corruption
  temp_file = "#{cache_file}.tmp"
  File.write(temp_file, JSON.generate(data))
  File.rename(temp_file, cache_file)
rescue StandardError => e
  warn "Cache write error: #{e.message}" if @verbose
  File.delete(temp_file) if File.exist?(temp_file)
end