peer and metadata: Implement the Stringer interface for Peer and Metadata #7137

AnomalRoil · 2024-04-17T16:01:01Z

Effectively allowing to print contextes containing a Peer properly.
Instead of printing with %v as:

context.Background.WithValue(type peer.peerKey, val <not Stringer>)

contexts containing a peer will now print as:

context.Background.WithValue(type peer.peerKey, val Peer{Addr: '1.2.3.4:1234', AuthInfo: 'testAuthInfo'})

This is also satisfying Stringer interface for Metadata, allowing to print them easily too. Since Metadata are basically a map, notice that String output is not stable. I could change it to print it in alphabetical order if you prefer.

RELEASE NOTES:

peer/peer: implement the Stringer interface for pretty printing Peer
metadata/metadata: implement the Stringer interface for pretty printing MD

linux-foundation-easycla · 2024-04-17T16:01:06Z

The committers listed above are authorized under a signed CLA.

✅ login: AnomalRoil / name: AnomalRoil (83118ab, 985347e, 20ee25c, 172603c, d36bfd5, c908bad, edfd323, 067b07e, e482bcc)

peer/peer.go

metadata/metadata.go

peer/peer_test.go

balancer_wrapper.go

Effectively allowing to print context containing Peers properly Also enabling logging of Metadata in an easier way RELEASE NOTES: - peer/peer: implement the Stringer interface for pretty-printing Peers - metadata/metadata: implement the Stringer interface for pretty printing metadata Signed-off-by: Yolan Romailler <anomalroil@users.noreply.github.com>

Signed-off-by: Yolan Romailler <anomalroil@users.noreply.github.com>

…fication of which SubConn is used Protect access to curAddr with ac.mutex Signed-off-by: Yolan Romailler <anomalroil@users.noreply.github.com>

Signed-off-by: Yolan Romailler <anomalroil@users.noreply.github.com>

…n identification of which SubConn is used" This reverts commit 001f394. Signed-off-by: Yolan Romailler <anomalroil@users.noreply.github.com>

arvindbr8

The change overall looks good to me. I took a pass at it. please take a look

metadata/metadata.go

metadata/metadata_test.go

peer/peer.go

peer/peer_test.go

metadata/metadata.go

arvindbr8

The change overall looks good to me. I took a pass at it. please take a look

Signed-off-by: Yolan Romailler <anomalroil@users.noreply.github.com>

arvindbr8

Thanks, I've responded to our conversations here. Please take a look

metadata/metadata.go

peer/peer.go

metadata/metadata.go

metadata/metadata_test.go

peer/peer_test.go

metadata/metadata_test.go

Co-authored-by: Arvind Bright <arvind.bright100@gmail.com>

Signed-off-by: Yolan Romailler <anomalroil@users.noreply.github.com>

arvindbr8 · 2024-05-02T17:23:14Z

peer/peer_test.go

+		want string
+	}{
+		{
+			name: "+Addr-LocalAddr+ValidAuth",


Just FYI, go test std library already does something similar by replacing \ss with _s.

I was trying to convey information about whether the test case included + or didn't include - that specific field.

The use of + and - to convey the presence or absence of certain fields within the Peer isn't very readable. How about the following:

withAddrAndValidAuth

withAddrLocalAddrAndValidAuth

withAddrAndEmptyAuth

withAddrLocalAddrAndEmptyAuth

nilPeer

The above names in the test output are more readable I feel.

arvindbr8 · 2024-05-02T17:24:27Z

Per policy we need one more review before we can check this in. I will ping a co-maintainer to take a look at this.

zasweq

LGTM. Thank you for the contribution.

serathius · 2024-06-26T18:32:35Z

Making String() non-deterministic broke etcd stream selection mechanism.

dims · 2024-06-26T18:45:07Z

@serathius @zasweq the following patch to make the string deterministic solves our issue:

diff --git a/vendor/google.golang.org/grpc/metadata/metadata.go b/vendor/google.golang.org/grpc/metadata/metadata.go
index 6c01a9b359cc..ec1055f6ccf0 100644
--- a/vendor/google.golang.org/grpc/metadata/metadata.go
+++ b/vendor/google.golang.org/grpc/metadata/metadata.go
@@ -24,6 +24,7 @@ package metadata // import "google.golang.org/grpc/metadata"
 import (
 	"context"
 	"fmt"
+	"sort"
 	"strings"
 
 	"google.golang.org/grpc/internal"
@@ -95,11 +96,16 @@ func Pairs(kv ...string) MD {
 func (md MD) String() string {
 	var sb strings.Builder
 	fmt.Fprintf(&sb, "MD{")
-	for k, v := range md {
+	keys := make([]string, 0, len(md))
+	for k := range md {
+		keys = append(keys, k)
+	}
+	sort.Strings(keys)
+	for _, k := range keys {
 		if sb.Len() > 3 {
 			fmt.Fprintf(&sb, ", ")
 		}
-		fmt.Fprintf(&sb, "%s=[%s]", k, strings.Join(v, ", "))
+		fmt.Fprintf(&sb, "%s=[%s]", k, strings.Join(md[k], ", "))
 	}
 	fmt.Fprintf(&sb, "}")
 	return sb.String()

serathius · 2024-06-26T18:53:03Z

Context why deterministic String() is important for etcd.

Etcd uses grpc metadata to change properties of the bi-directional watch stream. Example of that is WithRequireLeader() which will ask server to break the stream if leader is no longer available in the cluster. As client can make multiple watch requests within a bi-directional stream, we need to create a separate stream for clients that provide different metadata in the request context. Etcd client get the identifiers of stream by formatting the context metadata, so it's crucial to have deterministic stringer to properly reuse the streams.

Code: https://github.com/etcd-io/etcd/blob/21e5876f7f0539509c277b4c2a3ba1b1599b1721/client/v3/watch.go#L1038-L1043

easwars · 2024-06-26T18:47:54Z

metadata/metadata.go

@@ -90,6 +90,21 @@ func Pairs(kv ...string) MD {
 	return md
 }

+// String implements the Stringer interface for pretty-printing a MD.
+// Ordering of the values is non-deterministic as it ranges over a map.


What do you think about sorting the keys before generating the string representation and ensuring that the output is deterministic. This will also make the unit test much simpler than what it is currently.

easwars · 2024-06-26T18:48:38Z

metadata/metadata.go

+	var sb strings.Builder
+	fmt.Fprintf(&sb, "MD{")
+	for k, v := range md {
+		if sb.Len() > 3 {


How about defining a bool first and using that as the conditional here, instead of this magic check which took me sometime to understand.

easwars · 2024-06-26T18:52:42Z

peer/peer_test.go

+		want string
+	}{
+		{
+			name: "+Addr-LocalAddr+ValidAuth",


The use of + and - to convey the presence or absence of certain fields within the Peer isn't very readable. How about the following:

withAddrAndValidAuth

withAddrLocalAddrAndValidAuth

withAddrAndEmptyAuth

withAddrLocalAddrAndEmptyAuth

nilPeer

The above names in the test output are more readable I feel.

easwars · 2024-06-26T18:54:22Z

Phew.... Didn't realize that the PR was already approved and merged.

AnomalRoil force-pushed the master branch 2 times, most recently from bc88d17 to 5e7b8a3 Compare April 17, 2024 16:10

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AnomalRoil added 5 commits April 24, 2024 12:04

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20ee25c

Signed-off-by: Yolan Romailler <anomalroil@users.noreply.github.com>

Improve Stringer interface on acBalancerWrapper to allow human identi…

172603c

…fication of which SubConn is used Protect access to curAddr with ac.mutex Signed-off-by: Yolan Romailler <anomalroil@users.noreply.github.com>

Use a strings.Builder in Peer.String with explicit nil fields

edfd323

Signed-off-by: Yolan Romailler <anomalroil@users.noreply.github.com>

Revert "Improve Stringer interface on acBalancerWrapper to allow huma…

985347e

…n identification of which SubConn is used" This reverts commit 001f394. Signed-off-by: Yolan Romailler <anomalroil@users.noreply.github.com>

AnomalRoil force-pushed the master branch from 4ab12a3 to 985347e Compare April 24, 2024 10:04

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aranjans added this to the 1.64 Release milestone Apr 29, 2024

aranjans added the Type: Behavior Change Behavior changes not categorized as bugs label Apr 29, 2024

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Addressing code review comments

067b07e

Signed-off-by: Yolan Romailler <anomalroil@users.noreply.github.com>

AnomalRoil force-pushed the master branch from c84fd25 to 067b07e Compare May 1, 2024 17:13

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Co-authored-by: Arvind Bright <arvind.bright100@gmail.com>

Not doing Peer's security level test

c908bad

Signed-off-by: Yolan Romailler <anomalroil@users.noreply.github.com>

aranjans removed the Status: Requires Reporter Clarification label May 2, 2024

aranjans assigned arvindbr8 May 2, 2024

Applying the rest of the code review comments

d36bfd5

Signed-off-by: Yolan Romailler <anomalroil@users.noreply.github.com>

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zasweq changed the title ~~Satisfy the Stringer interface for Peer and Metadata~~ peer/ and metadata/:Implement the Stringer interface for Peer and Metadata May 6, 2024

zasweq changed the title ~~peer/ and metadata/:Implement the Stringer interface for Peer and Metadata~~ peer and metadata:Implement the Stringer interface for Peer and Metadata May 6, 2024

zasweq changed the title ~~peer and metadata:Implement the Stringer interface for Peer and Metadata~~ peer and metadata: Implement the Stringer interface for Peer and Metadata May 6, 2024

zasweq merged commit 9d9a96f into grpc:master May 6, 2024
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serathius mentioned this pull request Jun 26, 2024

[Flaking Test] UT apiserver/pkg/storage: cacher for 3m timeout kubernetes/kubernetes#125688

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dims mentioned this pull request Jun 26, 2024

metadata: make Stringer implementation consistent #7355

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peer and metadata: Implement the Stringer interface for Peer and Metadata #7137

peer and metadata: Implement the Stringer interface for Peer and Metadata #7137

AnomalRoil commented Apr 17, 2024 •

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peer and metadata: Implement the Stringer interface for Peer and Metadata #7137

peer and metadata: Implement the Stringer interface for Peer and Metadata #7137

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