allow using a custom http client in rpc client by gracenoah · Pull Request #3779 · tendermint/tendermint

gracenoah · 2019-07-09T13:52:22Z

fixes #2010

This also fixes another issue I had: We would like to be able to close all http connections between tests by calling client.Transport.(*http.Transport).CloseIdleConnections() but the http client is created inside the various constructors and not exposed anywhere. It seemed much better to allow users to set an entirely custom http client than to try to predict all possible options that might need to be set on it.

I tried to preserve backwards compatibility, which is why I used an options pattern in NewJSONRPCClient and NewHTTP.

If you don't like the use of the options pattern on NewHTTP, consider the PR with just the first commit.

If you prefer different naming, let me know. I know the names got pretty ugly.

rpc/client/rpc_test.go

gracenoah · 2019-07-09T14:54:32Z

I don't see how my change could have caused the failure. Any ideas? It's coming from

func getLocalClient() *client.Local {
	return client.NewLocal(node)
}

and seems to be an issue because node is global and being accessed by concurrent tests.

melekes · 2019-07-25T08:35:38Z

I view functional options as a way to modify some minor properties of the object (like changing car's color). If we're going to replace the car's engine (the most important detail; maybe a bad analogy), then I would rather use a constructor:

NewHTTPWithClient(c http.Client)
NewJSONRPCClientWithHTTPClient(c http.Client)

Agree/disagree?

gracenoah · 2019-07-25T14:38:51Z

I see functional options as a way of not breaking backwards compatibility while still allowing for constructors to be customized. If you don't expect to ever need any other options and you prefer alternative constructors, I'm happy to change the PR. Just let me know.

Any tips for fixing the race?

melekes · 2019-07-25T16:41:36Z

If you don't expect to ever need any other options and you prefer alternative constructors, I'm happy to change the PR. Just let me know.

Please do

melekes · 2019-07-25T16:52:11Z

Any tips for fixing the race?

no idea. But I can take a look once you're done with the code.

tac0turtle · 2019-08-05T10:49:57Z

is there an update to this PR?

gracenoah · 2019-08-11T18:35:39Z

Sorry for the delay. Updated with separate constructors.
The tests failed with a race:

==================
WARNING: DATA RACE
Read at 0x00c001005b70 by goroutine 471:
  github.com/tendermint/tendermint/blockchain/v0.(*BlockchainReactor).poolRoutine()
      /go/src/github.com/tendermint/tendermint/blockchain/v0/reactor.go:336 +0xeca

Previous write at 0x00c001005b70 by goroutine 463:
  github.com/tendermint/tendermint/blockchain/v0.TestBadBlockStopsPeer()
      /go/src/github.com/tendermint/tendermint/blockchain/v0/reactor_test.go:223 +0x978
  testing.tRunner()
      /usr/local/go/src/testing/testing.go:865 +0x163

Goroutine 471 (running) created at:
  github.com/tendermint/tendermint/blockchain/v0.(*BlockchainReactor).OnStart()
      /go/src/github.com/tendermint/tendermint/blockchain/v0/reactor.go:118 +0x127
  github.com/tendermint/tendermint/libs/common.(*BaseService).Start()
      /go/src/github.com/tendermint/tendermint/libs/common/service.go:139 +0x504
  github.com/tendermint/tendermint/blockchain/v0.(*BlockchainReactor).Start()
      <autogenerated>:1 +0x43
  github.com/tendermint/tendermint/p2p.(*Switch).OnStart()
      /go/src/github.com/tendermint/tendermint/p2p/switch.go:223 +0x120
  github.com/tendermint/tendermint/libs/common.(*BaseService).Start()
      /go/src/github.com/tendermint/tendermint/libs/common/service.go:139 +0x504
  github.com/tendermint/tendermint/p2p.StartSwitches()
      /go/src/github.com/tendermint/tendermint/p2p/test_util.go:160 +0x75
  github.com/tendermint/tendermint/p2p.MakeConnectedSwitches()
      /go/src/github.com/tendermint/tendermint/p2p/test_util.go:81 +0x18e
  github.com/tendermint/tendermint/blockchain/v0.TestBadBlockStopsPeer()
      /go/src/github.com/tendermint/tendermint/blockchain/v0/reactor_test.go:198 +0x72b
  testing.tRunner()
      /usr/local/go/src/testing/testing.go:865 +0x163

Goroutine 463 (running) created at:
  testing.(*T).Run()
      /usr/local/go/src/testing/testing.go:916 +0x65a
  testing.runTests.func1()
      /usr/local/go/src/testing/testing.go:1157 +0xa8
  testing.tRunner()
      /usr/local/go/src/testing/testing.go:865 +0x163
  testing.runTests()
      /usr/local/go/src/testing/testing.go:1155 +0x523
  testing.(*M).Run()
      /usr/local/go/src/testing/testing.go:1072 +0x2eb
  main.main()
      _testmain.go:102 +0x334
==================
I[2019-08-11|18:26:51.152] Committed state                              height=130 txs=10 appHash=
panic: BlockStore can only save contiguous blocks. Wanted 149, got 147

goroutine 1546 [running]:
github.com/tendermint/tendermint/store.(*BlockStore).SaveBlock(0xc000e4c8a0, 0xc00217ab40, 0xc000101220, 0xc002182700)
	/go/src/github.com/tendermint/tendermint/store/store.go:152 +0x98b
github.com/tendermint/tendermint/blockchain/v0.(*BlockchainReactor).poolRoutine(0xc001005a00)
	/go/src/github.com/tendermint/tendermint/blockchain/v0/reactor.go:336 +0xf32
created by github.com/tendermint/tendermint/blockchain/v0.(*BlockchainReactor).OnStart
	/go/src/github.com/tendermint/tendermint/blockchain/v0/reactor.go:118 +0x128
FAIL	github.com/tendermint/tendermint/blockchain/v0	18.812s

The race doesn't seem related to my change. Please advise on how to proceed.

gracenoah · 2019-09-02T13:56:27Z

I think I fixed the test. There was some weird global state being modified. I don't understand what it was, but at least the test passes now.

codecov-io · 2019-09-02T14:05:23Z

Codecov Report

Merging #3779 into master will increase coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3779      +/-   ##
==========================================
+ Coverage   66.95%   66.99%   +0.04%     
==========================================
  Files         219      219              
  Lines       18473    18478       +5     
==========================================
+ Hits        12368    12379      +11     
+ Misses       5185     5181       -4     
+ Partials      920      918       -2

Impacted Files	Coverage Δ
rpc/client/httpclient.go	`69.32% <100%> (+0.62%)`	⬆️
libs/events/events.go	`93.2% <0%> (-4.86%)`	⬇️
p2p/pex/pex_reactor.go	`82.6% <0%> (-2.32%)`	⬇️
p2p/conn/connection.go	`80.71% <0%> (-0.26%)`	⬇️
consensus/state.go	`80.18% <0%> (+0.23%)`	⬆️
blockchain/v0/pool.go	`80.98% <0%> (+0.32%)`	⬆️
consensus/reactor.go	`78.89% <0%> (+1.17%)`	⬆️
consensus/replay.go	`72.17% <0%> (+1.2%)`	⬆️
privval/signer_endpoint.go	`84% <0%> (+2.66%)`	⬆️
privval/signer_server.go	`100% <0%> (+4.34%)`	⬆️

melekes

Thanks for the changes 👍 See my comment about testing HTTPClient with a custom http.Client

rpc/client/httpclient.go

rpc/client/rpc_test.go

rpc/lib/client/http_client.go

rpc/client/httpclient.go

rpc/lib/client/http_client.go

gracenoah · 2019-09-03T11:30:20Z

🤦‍♂ Sorry I guess I did the renaming a bit too mechanically

rpc/client/rpc_test.go

melekes · 2019-09-03T19:26:28Z

I think we should

rename makeHTTPClient to DefaultHTTPClient and expose it
forbid passing nil http.Client. I see it as an antipattern when function called XWithY allows passing Y=nil (https://en.wikipedia.org/wiki/Null_Object_pattern is somewhat related)

I can do it myself or @gracenoah if he/she wants to.

Plus we still need a test here. Actually two tests

gracenoah · 2019-09-03T19:45:20Z

@melekes What do you recommend doing in case of a nil http client? I don't want to complicate the signature of the function by adding an error return and panicing wouldn't be significantly different from doing nothing and letting it panic somewhere else.

For tests, are unit tests that check the private member variables sufficient? Do you want me to write some kind of integration test? What did you have in mind?

melekes · 2019-09-03T20:09:59Z

What do you recommend doing in case of a nil http client?

panic

For tests, are unit tests that check the private member variables sufficient?

c := NewHTTPWithClient(remote, http.DefaultClient())
status, err := c.Status()
require.NoError(t, err)

gracenoah · 2019-09-03T20:47:59Z

Oops. Added tests.

gracenoah · 2019-09-03T21:22:02Z

That ended up messy. I think the next step here is to pull out the protocol selection from makeHTTPDialer so that the caller of NewHTTPWithClient doesn't have to do that conversion on their own.

rpc/lib/client/http_client.go

gracenoah · 2019-09-03T22:00:01Z

I had to do a bunch of refactoring to untangle the parsing of addresses from the creation of the dialer and preserve the use of the "address" vs "remote" throughout. I had to add a bunch of panics because these functions used to not error. They used to fail later at dial time if given invalid parameters. Obviously, I'm not happy with the result, but I'm not sure what to do next. The only alternative I see it to require the caller to know both the "remote" and the "address" when using a custom http client. Maybe we can expose the clientAddress function and require the caller of NewJSONRPCClientWithHTTPClient to use it instead of passing the remote in?

rpc/client/httpclient.go

rpc/client/rpc_test.go

rpc/lib/client/http_client.go

gracenoah · 2019-09-04T11:44:55Z

I can make those fixes, but what do you think about the new potential error case that I had to add a panic for? Should I:

leave it as-is to preserve API compatibility
change the constructor signature to return an error
change the constructor to not call a function that can fail (take in the address and remote as separate parameters)

melekes

👍

rpc/lib/client/ws_client.go

rpc/lib/client/http_client.go

rpc/client/httpclient.go

melekes · 2019-09-05T12:07:50Z

In the next major version we should probably modify functions to return errors if remote is invalid.

melekes · 2019-09-05T12:35:32Z

Can you also add an entry to CHANGELOG_PENDING.md? [rpc] \#2010 Add NewHTTPWithClient and NewJSONRPCClientWithHTTPClient (note these and NewHTTP, NewJSONRPCClient functions panic if remote is invalid) (@gracenoah)

CHANGELOG_PENDING.md

Co-Authored-By: Anton Kaliaev <anton.kalyaev@gmail.com>

fixes tendermint#2010 * allow using a custom http client in rpc client * add tests and fix bug * fix confusion between remote and address * parse remote inside NewJSONRPCClientWithHTTPClient * cleanups * add warnings * add changelog entry * Update CHANGELOG_PENDING.md Co-Authored-By: Anton Kaliaev <anton.kalyaev@gmail.com>

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This meant that setting <code>os.Setenv("BURNTSUSHI_TOML_110", "")</code> had no effect, as it happens after the import. </li> <li> Fix order of <code>Meta.Keys()</code> for inline tables (this has been an issue since support for inline tables was added). </li> </ul> <h2>v1.3.0</h2> New features: <ul> <li> Support upcoming TOML 1.1 While it looks like TOML 1.1 is mostly stable and I don't expect any further major changes, there are NO compatibility guarantees as it is NOT yet released and anything can still change. To use it, set the <code>BURNTSUSHI_TOML_110</code> environment variable to any value, which can be done either with <code>os.SetEnv()</code> or by the user running a program. 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gracenoah requested review from ebuchman, melekes and xla as code owners July 9, 2019 13:52

golangcibot reviewed Jul 9, 2019

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gracenoah force-pushed the custom-http-client branch from c3a393b to 5a2b7eb Compare July 9, 2019 14:10

gracenoah force-pushed the custom-http-client branch from 5a2b7eb to 050f00a Compare July 12, 2019 12:10

melekes mentioned this pull request Aug 5, 2019

Add Timeout to http.client #3876

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5 tasks

tac0turtle added the WIP label Aug 5, 2019

gracenoah force-pushed the custom-http-client branch from f20c0a8 to 60f71c5 Compare August 11, 2019 18:22

tac0turtle removed the WIP label Aug 12, 2019

melekes suggested changes Sep 3, 2019

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melekes self-assigned this Sep 3, 2019

melekes reviewed Sep 3, 2019

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melekes reviewed Sep 3, 2019

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gracenoah force-pushed the custom-http-client branch from 9984377 to d432ff3 Compare September 3, 2019 19:39

allow using a custom http client in rpc client

946626f

gracenoah force-pushed the custom-http-client branch from d432ff3 to 946626f Compare September 3, 2019 19:42

add tests and fix bug

1888a65

gracenoah closed this Sep 3, 2019

gracenoah reopened this Sep 3, 2019

gracenoah force-pushed the custom-http-client branch from bf10f5e to 8394af5 Compare September 3, 2019 21:12

fix confusion between remote and address

bfd4bc6

gracenoah force-pushed the custom-http-client branch from 8394af5 to bfd4bc6 Compare September 3, 2019 21:13

golangcibot reviewed Sep 3, 2019

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parse remote inside NewJSONRPCClientWithHTTPClient

49eebd7

gracenoah force-pushed the custom-http-client branch from 7949c9c to 49eebd7 Compare September 3, 2019 21:58

melekes reviewed Sep 4, 2019

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cleanups

3fa3956

melekes approved these changes Sep 5, 2019

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melekes reviewed Sep 5, 2019

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melekes reviewed Sep 5, 2019

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melekes and others added 2 commits September 5, 2019 16:07

Merge branch 'master' into custom-http-client

430b4b1

add warnings

b925a19

melekes mentioned this pull request Sep 5, 2019

Modify NewHTTP, NewXXXClient funcs to return errors #3953

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add changelog entry

ef21339

melekes reviewed Sep 5, 2019

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Update CHANGELOG_PENDING.md

037de40

Co-Authored-By: Anton Kaliaev <anton.kalyaev@gmail.com>

melekes merged commit aa721b9 into tendermint:master Sep 5, 2019

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