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Add ErrorObject to StripeError exceptions #811

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Aug 16, 2019
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r? @brandur-stripe @remi-stripe
cc @stripe/api-libraries

Add a Stripe::ErrorObject that represents the error API resource (https://stripe.com/docs/api/errors).

This makes it slightly easier for users to access attributes on the error object.

Instead of this:

rescue Stripe::CardError => e
  body = e.json_body
  err  = body[:error]
  puts "Decline code is: #{err[:decline_code]}" if err[:decline_code]

users can now do this:

rescue Stripe::CardError => e
  puts "Decline code is: #{e.error.decline_code}" if e.error.decline_code

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Nice! Left a couple comments below, but seems like a big usability win to me.

One comment on overall design: one alternative I could imagine for this would be to basically denormalize all the ErrorObject fields onto the top-level StripeError. That's not how the object is organized in the API response, but it makes accessing things easier (e.decline_code instead of e.error.decline_code), and from a user-perspective, there's no obvious reason that an error object would have an additional level of indirection below it. stripe-go works like this today.

I'm basically suggesting that for discussion and don't feel strongly at all (and it may be worse). Having an object hierarchy that matches JSON responses is basically how it works everywhere else in the library, so it could be very well that the right decision is do exactly the same for errors as well.

ptal @ob-stripe

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ob-stripe commented Jul 29, 2019

One comment on overall design: one alternative I could imagine for this would be to basically denormalize all the ErrorObject fields onto the top-level StripeError. That's not how the object is organized in the API response, but it makes accessing things easier (e.decline_code instead of e.error.decline_code), and from a user-perspective, there's no obvious reason that an error object would have an additional level of indirection below it. stripe-go works like this today.

I'm basically suggesting that for discussion and don't feel strongly at all (and it may be worse). Having an object hierarchy that matches JSON responses is basically how it works everywhere else in the library, so it could be very well that the right decision is do exactly the same for errors as well.

I didn't realize there was a precedent for this in stripe-go -- the approach here is closer to stripe-dotnet's, where the StripeException exception class has a StripeError property that returns the StripeError API resource.

(EDIT: As an additional data point, stripe-java does ~the same thing, the StripeException exception class returns the StripeError API resource via a getStripeError() accessor).

I agree the indirection feels unneeded from a user perspective though. There's a small risk of conflict between attributes on the exception and the API resource object, but I think in practice the only overlap would be message, and we probably want the exception's message to be the message returned by the API anyway.

@remi-stripe Do you have any preferences for either approach?

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I prefer to separate the Stripe error from the Exception class. I know we did it in stripe-go but I do think mirroring the API is likely worth it, at least for a while. The current situation on how to handle errors is already quite dire that this change is making this better while staying consistent with the rest of the API.

I don't have strong feels, and I can imagine us making the change next year after all too so if @brandur-stripe feels it'd be better I'm fine with it but otherwise I'd go with the current approach

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I prefer to separate the Stripe error from the Exception class. I know we did it in stripe-go but I do think mirroring the API is likely worth it, at least for a while. The current situation on how to handle errors is already quite dire that this change is making this better while staying consistent with the rest of the API.

Remi, can you clarify a bit on what your ideal solution would be? Are you saying that (1) you'd rather than just have these various properties put directly on StripeError instead of a different class, or (2) something a little more complicated, like that error handling as a whole isn't done very well in the library, and we should think about some alternative pattern for it like moving away from exception handling:

charge, err = Stripe::Charge.create

(Or is it something else?)

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Sorry if that was confusing. To reword a bit: I think it's better to do e.error.decline_code instead of e.decline_code. I think we should separate the Exception layer from the Stripe Error itself and mirror what we do in Java and .NET and not match what we do in Go.

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Sorry if that was confusing. To reword a bit: I think it's better to do e.error.decline_code instead of e.decline_code. I think we should separate the Exception layer from the Stripe Error itself and mirror what we do in Java and .NET and not match what we do in Go.

Ahh, I see. Okay, I think that's actually what OB's done here: we already had an exception class, but a new ErrorObject is added which is basically a holder for things in the error key. A new accessor is added to the original error which hydrates the new object. (So you would get e.error.decline_code).

It may be that the naming is a little too unintuitive at first sight. I wonder if InnerErrorObject or something like that might be more appropriate?

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Just made a few updates, mostly adding some comments and declaring a separate OAuthErrorObject class for OAuth errors.

It may be that the naming is a little too unintuitive at first sight. I wonder if InnerErrorObject or something like that might be more appropriate?

Hm, I like the ErrorObject / ListObject parity. Are you worried because the term "error" is used for exceptions in Ruby?

I'd like to ship this with v5 early next week. ptal @brandur-stripe

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Hm, I like the ErrorObject / ListObject parity. Are you worried because the term "error" is used for exceptions in Ruby?

Yes, that's it exactly. In an OO language, most things are objects, so naming something Error versus ErrorObject feels like the same thing.

No strong objects though — in most cases users should never even reference this name (it'll be used through an accessor on Error instead), so it's not that big of a deal.

New comments look great. Something in build failed with JRuby — I tried restarting it, and we'll see if that does the trick. This LGTM.

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Restarting the build didn't work, and it kind of looks like some install problem that occurs before we even enter our stack:

$ rvm use jruby-9.0.5.0 --install --binary --fuzzy
unsupported Java version "11", defaulting to 1.7
LoadError: library `java' could not be loaded: java.lang.reflect.InaccessibleObjectException: Unable to make protected native java.lang.Object java.lang.Object.clone() throws java.lang.CloneNotSupportedException accessible: module java.base does not "opens java.lang" to module jruby
1.55s$ gem install bundler -v '< 2'
unsupported Java version "11", defaulting to 1.7
LoadError: library `java' could not be loaded: java.lang.reflect.InaccessibleObjectException: Unable to make protected native java.lang.Object java.lang.Object.clone() throws java.lang.CloneNotSupportedException accessible: module java.base does not "opens java.lang" to module jruby
The command "gem install bundler -v '< 2'" failed and exited with 1 during .

@ob-stripe You probably saw, but I ended up upgrading JRuby in v5-integration. It's possible that one easy fix would just be to rebase on that, but I'll leave it to you.

@ob-stripe ob-stripe changed the base branch from master to integration-v5 August 16, 2019 17:03
@ob-stripe ob-stripe changed the title [wip] Add ErrorObject to StripeError exceptions Add ErrorObject to StripeError exceptions Aug 16, 2019
@brandur brandur mentioned this pull request Aug 16, 2019
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Yep, rebasing on integration-v5 did the trick. Pulling this in.

@ob-stripe ob-stripe merged commit e840ce8 into integration-v5 Aug 16, 2019
@ob-stripe ob-stripe deleted the ob-error-object branch August 16, 2019 17:18
ob-stripe pushed a commit that referenced this pull request Aug 20, 2019
* Convert library to use built-in `Net::HTTP`

Moves the library off of Faraday and over onto the standard library's
built-in `Net::HTTP` module. The upside of the transition is that we
break away from a few dependencies that have caused us a fair bit of
trouble in the past, the downside is that we need more of our own code
to do things (although surprisingly, not that much more).

The biggest new pieces are:

* `ConnectionManager`: A per-thread class that manages a connection to
  each Stripe infrastructure URL (like `api.stripe.com`,
  `connect.stripe.com`, etc.) so that we can reuse them between
  requests. It's also responsible for setting up and configuring new
  `Net::HTTP` connections, which is a little more heavyweight
  code-wise compared to other libraries. All of this could have lived in
  `StripeClient`, but I extracted it because that class has gotten so
  big.

* `MultipartEncoder`: A class that does multipart form encoding for file
  uploads. Unfortunately, Ruby doesn't bundle anything like this. I
  built this by referencing the Go implementation because the original
  RFC is not very detailed or well-written. I also made sure that it was
  behaving similarly to our other custom implementations like
  stripe-node, and that it can really upload a file outside the test
  suite.

There's some risk here in that it's easy to miss something across one of
these big transitions. I've tried to test out various error cases
through tests, but also by leaving scripts running as I terminate my
network connection and bring it back. That said, we'd certainly release
on a major version bump because some of the interface (like setting
`Stripe.default_client`) changes.

* Drop support for old versions of Ruby

Drops support for Ruby 2.1 (EOL March 31, 2017) and 2.2 (EOL March 31,
2018). They're removed from `.travis.yml` and the gemspec and RuboCop
configuration have also been updated to the new lower bound.

Most of the diff here are minor updates to styling as required by
RuboCop:

* String literals are frozen by default, so the `.freeze` we had
  everywhere is now considered redundant.

* We can now use Ruby 1.9 style hash syntax with string keys like `{
  "foo": "bar" }`.

* Converted a few heredocs over to use squiggly (leading whitespace
  removed) syntax.

As discussed in Slack, I didn't drop support for Ruby 2.3 (EOL March 31,
2019) as we still have quite a few users on it. As far as I know
dropping it doesn't get us access to any major syntax improvements or
anything, so it's probably not a big deal.

* Make `CardError`'s `code` parameter named instead of positional (#816)

Makes the `code` parameter on `CardError` named instead of positional.
This makes it more consistent with the rest of the constructor's
parameters and makes instantiating `CardError` from `StripeClient`
cleaner.

This is a minor breaking change so we're aiming to release it for the
next major version of stripe-ruby.

* Bump Rubocop to latest version (#818)

* Ruby minimum version increase followup (#819)

* Remove old deprecated methods (#820)

* Remove all alias for list methods (#823)

* Remove UsageRecord.create method (#826)

* Remove IssuerFraudRecord (#827)

* Add ErrorObject to StripeError exceptions (#811)

* Tweak retry logic to be a little more like stripe-node (#828)

Tweaks the retry logic to be a little more like stripe-node's. In
particular, we also retry under these conditions:

* If we receive a 500 on a non-`POST` request.
* If we receive a 503.

I made it slightly different from stripe-node which checks for a 500
with `>= 500`. I don't really like that -- if we want to retry specific
status codes we should be explicit about it.

We're actively re-examining ways on how to make it easier for clients to
figure out when to retry right now, but I figure V5 is a good time to
tweak this because the modifications change the method signature of
`should_retry?` slightly, and it's technically a public method.

* Fix inverted sign for 500 retries (#830)

I messed up in #828 by (1) accidentally flipping the comparison against
`:post` when checking whether to retry on 500, and (2) forgetting to
write new tests for the condition, which is how (1) got through.

This patch fixes both those problems.

* Remove a few more very old deprecated methods (#831)

I noticed that we had a couple of other deprecated methods on `Stripe`
and `StripeObject` that have been around for a long time. May as well
get rid of them too -- luckily they were using `Gem::Deprecate` so
they've been producing annoying deprecated warnings for quite a while
now.

* Remove extraneous slash at the end of the line

* Reset connections when connection-changing configuration changes (#829)

Adds a few basic features around connection and connection manager
management:

* `clear` on connection manager, which calls `finish` on each active
  connection and then disposes of it.

* A centralized cross-thread tracking system for connection managers in
  `StripeClient` and `clear_all_connection_managers` which clears all
  known connection managers across all threads in a thread-safe way.

The addition of these allow us to modify the implementation of some of
our configuration on `Stripe` so that it can reset all currently open
connections when its value changes.

This fixes a currently problem with the library whereby certain
configuration must be set before the first request or it remains fixed
on any open connections. For example, if `Stripe.proxy` is set after a
request is made from the library, it has no effect because the proxy
must have been set when the connection was originally being initialized.

The impetus for getting this out is that I noticed that we will need
this internally in a few places when we're upgrading to stripe-ruby V5.
Those spots used to be able to hack around the unavailability of this
feature by just accessing the Faraday connection directly and resetting
state on it, but in V5 `StripeClient#conn` is gone, and that's no longer
possible.

* Minor cleanup in `StripeClient` (#832)

I ended up having to relax the maximum method line length in a few
previous PRs, so I wanted to try one more cleanup pass in
`execute_request` to see if I could get it back at all.

The answer was "not by much" (without reducing clarity), but I found a
few places that could be tweaked. Unfortunately, ~50 lines is probably
the "right" length for this method in that you _could_ extract it
further, but you'd end up passing huge amounts of state all over the
place in method parameters, and it really wouldn't look that good.

* Do better bookkeeping when tracking state in `Thread.current` (#833)

This is largely just another cleanup patch, but does a couple main
things:

* Hoists the `last_response` value into thread state. This is a very
  minor nicety, but effectively makes `StripeClient` fully thread-safe,
  which seems like a minor nicety. Two calls to `#request` to the same
  `StripeObject` can now be executed on two different threads and their
  results won't interfere with each other.

* Moves state off one-off `Thread.current` keys and into a single one
  for the whole client which stores a new simple type of record called
  `ThreadContext`. Again, this doesn't change much, but adds some minor
  type safety and lets us document each field we expect to have in a
  thread's context.

* Add Invoice.list_upcoming_line_items method (#834)
@LilyReile
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Is the intention to eventually deprecate the public #json_body? Currently the error data is exposed both ways.

@ob-stripe
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@DylanReile I think we'll probably keep #json_body around (it can be useful if e.g. a new error property is added that your stripe-ruby version doesn't know about and you're not ready to upgradde yet), but using the StripeError object should be preferred when possible.

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