From a5ac198f47cc50d9a87504ea63945e13708c74a4 Mon Sep 17 00:00:00 2001
From: Jan Grant <jang@ioctl.org>
Date: Thu, 13 Jun 2024 16:18:14 +0100
Subject: [PATCH] kfake: Drop topic configuration validation

This isn't used at the moment; it gets in the way of using kfake to stub out behaviour
that mocks custom cluster & topic config.
---
 pkg/kfake/19_create_topics.go |  5 ---
 pkg/kfake/data.go             | 62 -----------------------------------
 pkg/kfake/groups.go           |  2 +-
 3 files changed, 1 insertion(+), 68 deletions(-)

diff --git a/pkg/kfake/19_create_topics.go b/pkg/kfake/19_create_topics.go
index d2d3185e..1f9d00e6 100644
--- a/pkg/kfake/19_create_topics.go
+++ b/pkg/kfake/19_create_topics.go
@@ -46,7 +46,6 @@ func (c *Cluster) handleCreateTopics(b *broker, kreq kmsg.Request) (kmsg.Respons
 		uniq[rt.Topic] = struct{}{}
 	}
 
-topics:
 	for _, rt := range req.Topics {
 		if _, ok := c.data.tps.gett(rt.Topic); ok {
 			donet(rt.Topic, kerr.TopicAlreadyExists.Code)
@@ -66,10 +65,6 @@ topics:
 		}
 		configs := make(map[string]*string)
 		for _, c := range rt.Configs {
-			if ok := validateSetTopicConfig(c.Name, c.Value); !ok {
-				donet(rt.Topic, kerr.InvalidConfig.Code)
-				continue topics
-			}
 			configs[c.Name] = c.Value
 		}
 		c.data.mkt(rt.Topic, int(rt.NumPartitions), int(rt.ReplicationFactor), configs)
diff --git a/pkg/kfake/data.go b/pkg/kfake/data.go
index 725e2827..9f5d46c6 100644
--- a/pkg/kfake/data.go
+++ b/pkg/kfake/data.go
@@ -5,7 +5,6 @@ import (
 	"math/rand"
 	"sort"
 	"strconv"
-	"strings"
 	"time"
 
 	"github.com/twmb/franz-go/pkg/kmsg"
@@ -244,9 +243,6 @@ func (d *data) configs(t string, fn func(k string, v *string, src kmsg.ConfigSou
 
 // Unlike Kafka, we validate the value before allowing it to be set.
 func (c *Cluster) setBrokerConfig(k string, v *string, dry bool) bool {
-	if !validateSetBrokerConfig(k, v) {
-		return false
-	}
 	if dry {
 		return true
 	}
@@ -255,9 +251,6 @@ func (c *Cluster) setBrokerConfig(k string, v *string, dry bool) bool {
 }
 
 func (d *data) setTopicConfig(t string, k string, v *string, dry bool) bool {
-	if !validateSetTopicConfig(k, v) {
-		return false
-	}
 	if dry {
 		return true
 	}
@@ -268,61 +261,6 @@ func (d *data) setTopicConfig(t string, k string, v *string, dry bool) bool {
 	return true
 }
 
-func validateSetTopicConfig(k string, v *string) bool {
-	if _, ok := validTopicConfigs[k]; !ok {
-		return false
-	}
-	fn, ok := validateSetConfig[k]
-	if !ok {
-		return false
-	}
-	return fn(v)
-}
-
-func validateSetBrokerConfig(k string, v *string) bool {
-	if _, ok := validBrokerConfigs[k]; !ok {
-		return false
-	}
-	fn, ok := validateSetConfig[k]
-	if !ok {
-		return false
-	}
-	return fn(v)
-}
-
-// Validation functions for all configs we support setting. Keys not in this
-// map are not settable.
-var validateSetConfig = map[string]func(*string) bool{
-	"cleanup.policy": func(v *string) bool {
-		if v == nil {
-			return false
-		}
-		s := strings.Split(*v, ",")
-		for _, policy := range s {
-			if policy != "delete" && policy != "compact" {
-				return false
-			}
-		}
-		return true
-	},
-
-	"compression.type": staticConfig("uncompressed", "lz4", "zstd", "snappy", "gzip", "producer"),
-
-	"max.message.bytes":      numberConfig(0, true, 0, false),
-	"message.timestamp.type": staticConfig("CreateTime", "LogAppendTime"),
-	"min.insync.replicas":    numberConfig(1, true, 0, false),
-	"retention.bytes":        numberConfig(-1, true, 0, false),
-	"retention.ms":           numberConfig(-1, true, 0, false),
-
-	"default.replication.factor": numberConfig(1, true, 0, false),
-	"fetch.max.bytes":            numberConfig(1024, true, 0, false),
-	"log.dir":                    func(v *string) bool { return v != nil },
-	"log.message.timestamp.type": staticConfig("CreateTime", "LogAppendTime"),
-	"log.retention.bytes":        numberConfig(-1, true, 0, false),
-	"log.retention.ms":           numberConfig(-1, true, 0, false),
-	"message.max.bytes":          numberConfig(0, true, 0, false),
-}
-
 // All valid topic configs we support, as well as the equivalent broker
 // config if there is one.
 var validTopicConfigs = map[string]string{
diff --git a/pkg/kfake/groups.go b/pkg/kfake/groups.go
index eec79391..bc6934d6 100644
--- a/pkg/kfake/groups.go
+++ b/pkg/kfake/groups.go
@@ -102,7 +102,7 @@ func (gs groupState) String() string {
 
 func (c *Cluster) coordinator(id string) *broker {
 	gen := c.coordinatorGen.Load()
-	n := hashString(fmt.Sprint("%d", gen)+"\x00\x00"+id) % uint64(len(c.bs))
+	n := hashString(fmt.Sprintf("%d", gen)+"\x00\x00"+id) % uint64(len(c.bs))
 	return c.bs[n]
 }