AWS SDK for Ruby (V2) でエラー発生時に生の HTTP リクエスト・レスポンスを確認する #AWS

あまり必要ないかもだけど、やってたらできたのでメモしておく。

標準のログ出力だとできない

こんな感じで logger/log_level を指定しても、

require "aws-sdk"

ENV["AWS_ACCESS_KEY_ID"] = "test"
ENV["AWS_SECRET_ACCESS_KEY"] = "test"
ENV["AWS_REGION"] = "ap-northeast-1"

client = Aws::S3::Client.new(logger: Logger.new(STDOUT), log_level: :debug)
client.list_buckets

こんな出力になるだけ。

D, [2017-02-12T23:01:43.918174 #191] DEBUG -- : [Aws::S3::Client 403 0.027187 0 retries] list_buckets() Aws::S3::Errors::InvalidAccessKeyId The AWS Access Key Id you provided does not exist in our records.

エラーオブジェクトのコンテキストを参照するとよい

このようにエラーオブジェクトのコンテキストを p すると、

require "aws-sdk"

ENV["AWS_ACCESS_KEY_ID"] = "test"
ENV["AWS_SECRET_ACCESS_KEY"] = "test"
ENV["AWS_REGION"] = "ap-northeast-1"

begin
  Aws::S3::Client.new.list_buckets
rescue => e
  p e.context.http_request
  p e.context.http_request.body.read
  p e.context.http_response
  p e.context.http_response.body.read
end

このように生の HTTP リクエスト・レスポンスオブジェクトを調査することができる。

#<Seahorse::Client::Http::Request:0x00000001e67b10 @endpoint=#<URI::HTTPS https://s3-ap-northeast-1.amazonaws.com/>, @http_method="GET", @headers={"user-agent"=>"aws-sdk-ruby2/2.7.7 ruby/2.4.0 x86_64-linux", "x-amz-date"=>"20170212T230508Z", "host"=>"s3-ap-northeast-1.amazonaws.com", "x-amz-content-sha256"=>"e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855", "authorization"=>"AWS4-HMAC-SHA256 Credential=test/20170212/ap-northeast-1/s3/aws4_request, SignedHeaders=host;x-amz-content-sha256;x-amz-date, Signature=af202c352b983e16265c91eb435cf10044f8c0a7da511f61e2a4f7c3132a3a79", "content-length"=>"0"}, @body=#<StringIO:0x00000001cedc08>>
""
#<Seahorse::Client::Http::Response:0x00000001e58e80 @status_code=403, @headers={"x-amz-request-id"=>"73A1F598850BFE18", "x-amz-id-2"=>"FiIfC0BDsbYddCrVVMkrJV+9Toy9/cbq5XbD6xdmwJ9WnTnMaOxfjYkoaf/la6CAhyCeLoh34Vs=", "content-type"=>"application/xml", "transfer-encoding"=>"chunked", "date"=>"Sun, 12 Feb 2017 23:05:07 GMT", "server"=>"AmazonS3"}, @body=#<StringIO:0x00000001e58db8>, @listeners={:headers=>[], :data=>[], :done=>[]}, @complete=false, @done=true, @error=nil>
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<Error><Code>InvalidAccessKeyId</Code><Message>The AWS Access Key Id you provided does not exist in our records.</Message><AWSAccessKeyId>test</AWSAccessKeyId><RequestId>73A1F598850BFE18</RequestId><HostId>FiIfC0BDsbYddCrVVMkrJV+9Toy9/cbq5XbD6xdmwJ9WnTnMaOxfjYkoaf/la6CAhyCeLoh34Vs=</HostId></Error>"

参考資料

Class: Seahorse::Client::RequestContext — AWS SDK for Ruby V2