我正在为API编写客户端，该API可从Faraday::ConnectionFailed和Faraday::TimeoutError抢救以重试相同方法MAX_RETRIES次。
这是涉及的主要方法：
def benchmark_request(path)
retries ||= 0
request_start_time = Process.clock_gettime(Process::CLOCK_MONOTONIC)
response = yield
total_request_seconds = (Process.clock_gettime(Process::CLOCK_MONOTONIC) - request_start_time)
Rails.logger.info "client request took (#{total_request_seconds}s): #{ENV['API_PATH_PREFIX']}#{path}"
response
rescue Faraday::ConnectionFailed, Faraday::TimeoutError => e
retries += 1
retry if retries <= MAX_RETRIES
end
调用的方法是：
def get(path, params = {})
benchmark_request(path) { token.get("#{ENV['API_PATH_PREFIX']}#{path}", params) }
end
token.get来自使用oauth2的{{1}}宝石
这是有趣的地方。 我写了2个规范，每个要处理的异常1个。
Faraday测试测试context 'when the endpoint raises a ConnectionFailed' do
let(:token_expires_at) { 1.hour.from_now.to_i }
let(:response_body) { '' }
let(:response_status) { 200 }
before do
allow(token).to receive(:get).and_raise(Faraday::ConnectionFailed)
described_class.get(api_endpoint)
end
it 'is called MAX_RETRIES times' do
expect(token).to have_received(:get).exactly(3).times
end
end
context 'when the endpoint raises a TimeoutError' do
let(:token_expires_at) { 1.hour.from_now.to_i }
let(:response_body) { '' }
let(:response_status) { 200 }
before do
allow(token).to receive(:get).and_raise(Faraday::TimeoutError)
described_class.get(api_endpoint)
end
it 'is called MAX_RETRIES times' do
expect(token).to have_received(:get).exactly(3).times
end
end
失败，测试测试ConnectionFailed为绿色。
引发的异常是：
TimeoutError显然与异常的初始化方式有关。
有人有什么主意吗？
答案 0 :(得分：0)
before do
allow(token).to receive(:get).and_raise(Faraday::TimeoutError, 'execution expired')
described_class.get(api_endpoint)
end
我通过将second argument传递给and_raise方法解决了这个问题。我认为这是因为法拉第的异常类略有不同。