Created
October 22, 2013 20:51
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class Retriable | |
class << self | |
def config(&block) | |
self.new(&block) | |
end | |
end | |
def initialize(&block) | |
max_attempts 5 | |
retry_if { true } | |
backoff { 1 } | |
if block_given? | |
instance_eval(&block) | |
end | |
end | |
def max_attempts(value=nil) | |
if value.nil? | |
@max_attempts | |
else | |
@max_attempts = value | |
self | |
end | |
end | |
def retry_if(&block) | |
if block_given? | |
@retry_if = block | |
self | |
else | |
@retry_if | |
end | |
end | |
def backoff(&block) | |
if block_given? | |
@backoff = block | |
self | |
else | |
@backoff | |
end | |
end | |
def execute(&block) | |
attempts = 0 | |
begin | |
attempts += 1 | |
if block.arity == 1 | |
yield(attempts-1) | |
else | |
yield | |
end | |
rescue => e | |
if attempts < max_attempts && should_retry?(e) | |
sleep(compute_backoff(attempts)) | |
retry | |
else | |
raise e | |
end | |
end | |
end | |
private | |
def should_retry?(e) | |
@retry_if ? true : @retry_if.call(e) | |
end | |
def compute_backoff(attempts) | |
if @backoff.kind_of?(Proc) | |
@backoff.arity == 1 ? @backoff.call(attempts) : @backoff.call | |
else | |
0 | |
end | |
end | |
end |
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r = Retriable.new { | |
max_attempts 3 | |
retry_if {|e| e.kind_of?(DownError) } | |
backoff {|attempt| (attempt*0.5) + rand(1000)/1000.0 } | |
} | |
client = SomeClient.new | |
result = r.execute { | |
client.get_stuff | |
} |
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