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stats: Improved sequencing documentation for server-side stats events and added tests. #7885

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Response to Issue #7824

RELEASE NOTES:

  • Documentation Clarification: Clarified the expected sequencing of stats events in the server-side stats.Handler.
  • New Test Cases: Added tests to verify the event sequencing for various RPC types, ensuring consistency and accuracy in server-side stats handling.

…s to verify the order of server-side events.
@RyanBlaney RyanBlaney changed the title Documentation, Test: Improved sequencing documentation for server-side stats events and added tests. *: Improved sequencing documentation for server-side stats events and added tests. Dec 2, 2024
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codecov bot commented Dec 2, 2024

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.09%. Comparing base (4c07bca) to head (f291e58).
Report is 18 commits behind head on master.

Additional details and impacted files
@@            Coverage Diff             @@
##           master    #7885      +/-   ##
==========================================
+ Coverage   81.84%   82.09%   +0.24%     
==========================================
  Files         377      377              
  Lines       38120    38180      +60     
==========================================
+ Hits        31201    31344     +143     
+ Misses       5603     5538      -65     
+ Partials     1316     1298      -18     
Files with missing lines Coverage Δ
stats/stats.go 68.42% <ø> (ø)

... and 33 files with indirect coverage changes

@RyanBlaney RyanBlaney marked this pull request as ready for review December 2, 2024 03:13
@arjan-bal arjan-bal changed the title *: Improved sequencing documentation for server-side stats events and added tests. stats: Improved sequencing documentation for server-side stats events and added tests. Dec 2, 2024
@arjan-bal arjan-bal self-requested a review December 2, 2024 09:25
@arjan-bal arjan-bal self-assigned this Dec 2, 2024
@arjan-bal arjan-bal added the Type: Documentation Documentation or examples label Dec 2, 2024
@arjan-bal arjan-bal added this to the 1.69 Release milestone Dec 2, 2024
Comment on lines 153 to 156
func (s *testServer) UnaryCall(
ctx context.Context,
in *testpb.SimpleRequest,
) (*testpb.SimpleResponse, error) {
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grpc-go follows the Google style guide. Based on this section in the style guide:

The signature of a function or method declaration should remain on a single line to avoid indentation confusion.

Please revert the changes made to wrap function definationations and calls throughout the PR.

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Got it! I'll disable my autoformatter going forward or reconfigure it to follow the Google style guide.

@@ -786,8 +884,14 @@ func checkConnEnd(t *testing.T, d *gotData) {
st.IsClient() // TODO remove this.
}

type event struct {
eventType string
timestamp time.Time
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What is the use of storing a timestamp? I believe we're only interested in the ordering of the events and not the absolute times they were emitted.

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The timestamp was included for debugging purposes in case of test failures, since it could help identify delays or other issues. If you feel this isn’t valuable, I can to remove it for simplicity.

@RyanBlaney
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I have fixed the wrapping errors for formatting and I removed the timestamps from the event structs. Thank you for your feedback @arjan-bal, is there anything else you need me to do?

…. Added a server stats Server Stream RPC test.
@arjan-bal arjan-bal assigned arjan-bal and unassigned RyanBlaney Dec 3, 2024
@purnesh42H purnesh42H assigned purnesh42H and unassigned arjan-bal Dec 3, 2024
@arjan-bal arjan-bal requested review from purnesh42H and arjan-bal and removed request for arjan-bal December 3, 2024 08:01
@purnesh42H purnesh42H modified the milestones: 1.69 Release, 1.70 Release Dec 5, 2024
stats/stats.go Outdated
@@ -36,7 +36,49 @@ type RPCStats interface {
IsClient() bool
}

// InHeader contain stats when the header is received.
// First event in the server side event sequence.
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nix the extra space. Applicable everywhere. If you want to move the sentence to new line, you need to put a blank line in between. If you want bullets, you can use markdown style "-"

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Got it!

@@ -98,31 +140,6 @@ func (s *InPayload) IsClient() bool { return s.Client }

func (s *InPayload) isRPCStats() {}

// InHeader contains stats when a header is received.
type InHeader struct {
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@RyanBlaney we should just edit the documentation in current struct instead of deleting it entirely and re-creating. Also, restrict the documentation to struct instead of writing the whole sequence. Mentioning that it is the first event on server side after rpc is received is fine.

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I'll get right to it! Thank you!

@@ -136,7 +197,14 @@ func (s *testServer) UnaryCall(ctx context.Context, in *testpb.SimpleRequest) (*

func (s *testServer) FullDuplexCall(stream testgrpc.TestService_FullDuplexCallServer) error {
if err := stream.SendHeader(testHeaderMetadata); err != nil {
return status.Errorf(status.Code(err), "%v.SendHeader(%v) = %v, want %v", stream, testHeaderMetadata, err, nil)
return status.Errorf(
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golang doesn't restrict columns for code. Having it in one is fine.

@@ -81,6 +83,55 @@ var (
}
// The id for which the service handler should return error.
errorID int32 = 32202

// Server Stats
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Please fix the documentation everywhere. Remove extra spaces at start and end etc.

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Everything should be resolved now. Thank you for your help!

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I added a note for the StartServer function in the stats_test.go. It uses a few deprecated opts, so if you want me to resolve these issues I can do that. Also there is a TODO that got left for testing the OutHeader. If you need me to test that I can do that as well.

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3 participants