class Saddle::Middleware::Request::Retry
Catches exceptions and retries each request a limited number of times.
By default, it retries 0 times and performs exponential backoff, starting at 50ms
Public Class Methods
deep_copy(value)
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# File lib/saddle/middleware/request/retry.rb, line 42 def self.deep_copy(value) if value.is_a?(Struct) result = value.clone value.each{|k, v| result.send("#{k}=", deep_copy(v))} result elsif value.is_a?(Hash) result = value.clone value.each{|k, v| result[k] = deep_copy(v)} result elsif value.is_a?(Array) result = value.clone result.clear value.each{|v| result << deep_copy(v)} result else value end end
new(app, ignored_exceptions=[])
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Calls superclass method
# File lib/saddle/middleware/request/retry.rb, line 14 def initialize(app, ignored_exceptions=[]) super(app) @ignored_exceptions = ignored_exceptions end
Public Instance Methods
call(env)
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# File lib/saddle/middleware/request/retry.rb, line 19 def call(env) retries = env[:saddle][:num_retries] || 0 backoff = env[:saddle][:retry_backoff] || 0.050 # in seconds begin @app.call(self.class.deep_copy(env)) rescue => e # Only retry for GET or if the request is marked as idempotent if env[:method] == :get || env[:saddle][:idempotent] unless @ignored_exceptions.include?(e.class) # Retry a limited number of times if retries > 0 retries -= 1 sleep(backoff) if backoff > 0.0 backoff *= 2 retry end end end # Re-raise if we're out of retries or it's not handled raise end end