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driver/kubernetes/util: remove k8s.io/apiserver dependency 

Use a simplified local implementation that follow the same semantics,
so that we don't need k8s.io/apiserver as dependency.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn 2024-05-14 13:58:56 +02:00
parent c4db5b252a
commit 946e0a5d74
No known key found for this signature in database
GPG Key ID: 76698F39D527CE8C
7 changed files with 30 additions and 392 deletions
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32
driver/kubernetes/util/generate.go
View File

@ -1,12 +1,13 @@
package util
import (
"crypto/rand"
"encoding/hex"
"fmt"
"github.com/docker/buildx/store"
"github.com/google/uuid"
"github.com/pkg/errors"
"k8s.io/apiserver/pkg/storage/names"
)
func GenerateNodeName(builderName string, txn *store.Txn) (string, error) {
@ -15,7 +16,7 @@ func GenerateNodeName(builderName string, txn *store.Txn) (string, error) {
if err != nil {
return "", err
}
return names.SimpleNameGenerator.GenerateName(fmt.Sprintf("buildkit-%s-", u)), nil
return generateName(fmt.Sprintf("buildkit-%s-", u)), nil
}
ng, err := txn.NodeGroupByName(builderName)
@ -45,3 +46,30 @@ func GenerateNodeName(builderName string, txn *store.Txn) (string, error) {
return "", errors.Errorf("failed to generate random node name")
}
const (
maxNameLength = 63
randomLength = 5
maxGeneratedNameLength = maxNameLength - randomLength
)
// generateName generates the name plus a random suffix of five alphanumerics
// when a name is requested. The string is guaranteed to not exceed the length
// of a standard Kubernetes name (63 characters).
//
// It's a simplified implementation of k8s.io/apiserver/pkg/storage/names:
// https://github.com/kubernetes/apiserver/blob/v0.29.2/pkg/storage/names/generate.go#L34-L54
func generateName(base string) string {
if len(base) > maxGeneratedNameLength {
base = base[:maxGeneratedNameLength]
}
return base + randomSuffix()
}
func randomSuffix() string {
b := make([]byte, 32)
if _, err := rand.Read(b); err != nil {
panic(err) // This shouldn't happen
}
return hex.EncodeToString(b)[:randomLength]
}

1
go.mod
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@ -52,7 +52,6 @@ require (
gopkg.in/yaml.v3 v3.0.1
k8s.io/api v0.29.2
k8s.io/apimachinery v0.29.2
k8s.io/apiserver v0.29.2
k8s.io/client-go v0.29.2
)

2
go.sum
View File

@ -604,8 +604,6 @@ k8s.io/api v0.29.2 h1:hBC7B9+MU+ptchxEqTNW2DkUosJpp1P+Wn6YncZ474A=
k8s.io/api v0.29.2/go.mod h1:sdIaaKuU7P44aoyyLlikSLayT6Vb7bvJNCX105xZXY0=
k8s.io/apimachinery v0.29.2 h1:EWGpfJ856oj11C52NRCHuU7rFDwxev48z+6DSlGNsV8=
k8s.io/apimachinery v0.29.2/go.mod h1:6HVkd1FwxIagpYrHSwJlQqZI3G9LfYWRPAkUvLnXTKU=
k8s.io/apiserver v0.29.2 h1:+Z9S0dSNr+CjnVXQePG8TcBWHr3Q7BmAr7NraHvsMiQ=
k8s.io/apiserver v0.29.2/go.mod h1:B0LieKVoyU7ykQvPFm7XSdIHaCHSzCzQWPFa5bqbeMQ=
k8s.io/client-go v0.29.2 h1:FEg85el1TeZp+/vYJM7hkDlSTFZ+c5nnK44DJ4FyoRg=
k8s.io/client-go v0.29.2/go.mod h1:knlvFZE58VpqbQpJNbCbctTVXcd35mMyAAwBdpt4jrA=
k8s.io/klog/v2 v2.110.1 h1:U/Af64HJf7FcwMcXyKm2RPM22WZzyR7OSpYj5tg3cL0=

127
vendor/k8s.io/apimachinery/pkg/util/rand/rand.go generated vendored
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@ -1,127 +0,0 @@
/*
Copyright 2015 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
// Package rand provides utilities related to randomization.
package rand
import (
"math/rand"
"sync"
"time"
)
var rng = struct {
sync.Mutex
rand *rand.Rand
}{
rand: rand.New(rand.NewSource(time.Now().UnixNano())),
}
// Int returns a non-negative pseudo-random int.
func Int() int {
rng.Lock()
defer rng.Unlock()
return rng.rand.Int()
}
// Intn generates an integer in range [0,max).
// By design this should panic if input is invalid, <= 0.
func Intn(max int) int {
rng.Lock()
defer rng.Unlock()
return rng.rand.Intn(max)
}
// IntnRange generates an integer in range [min,max).
// By design this should panic if input is invalid, <= 0.
func IntnRange(min, max int) int {
rng.Lock()
defer rng.Unlock()
return rng.rand.Intn(max-min) + min
}
// IntnRange generates an int64 integer in range [min,max).
// By design this should panic if input is invalid, <= 0.
func Int63nRange(min, max int64) int64 {
rng.Lock()
defer rng.Unlock()
return rng.rand.Int63n(max-min) + min
}
// Seed seeds the rng with the provided seed.
func Seed(seed int64) {
rng.Lock()
defer rng.Unlock()
rng.rand = rand.New(rand.NewSource(seed))
}
// Perm returns, as a slice of n ints, a pseudo-random permutation of the integers [0,n)
// from the default Source.
func Perm(n int) []int {
rng.Lock()
defer rng.Unlock()
return rng.rand.Perm(n)
}
const (
// We omit vowels from the set of available characters to reduce the chances
// of "bad words" being formed.
alphanums = "bcdfghjklmnpqrstvwxz2456789"
// No. of bits required to index into alphanums string.
alphanumsIdxBits = 5
// Mask used to extract last alphanumsIdxBits of an int.
alphanumsIdxMask = 1<<alphanumsIdxBits - 1
// No. of random letters we can extract from a single int63.
maxAlphanumsPerInt = 63 / alphanumsIdxBits
)
// String generates a random alphanumeric string, without vowels, which is n
// characters long. This will panic if n is less than zero.
// How the random string is created:
// - we generate random int63's
// - from each int63, we are extracting multiple random letters by bit-shifting and masking
// - if some index is out of range of alphanums we neglect it (unlikely to happen multiple times in a row)
func String(n int) string {
b := make([]byte, n)
rng.Lock()
defer rng.Unlock()
randomInt63 := rng.rand.Int63()
remaining := maxAlphanumsPerInt
for i := 0; i < n; {
if remaining == 0 {
randomInt63, remaining = rng.rand.Int63(), maxAlphanumsPerInt
}
if idx := int(randomInt63 & alphanumsIdxMask); idx < len(alphanums) {
b[i] = alphanums[idx]
i++
}
randomInt63 >>= alphanumsIdxBits
remaining--
}
return string(b)
}
// SafeEncodeString encodes s using the same characters as rand.String. This reduces the chances of bad words and
// ensures that strings generated from hash functions appear consistent throughout the API.
func SafeEncodeString(s string) string {
r := make([]byte, len(s))
for i, b := range []rune(s) {
r[i] = alphanums[(int(b) % len(alphanums))]
}
return string(r)
}

202
vendor/k8s.io/apiserver/LICENSE generated vendored
View File

@ -1,202 +0,0 @@
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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54
vendor/k8s.io/apiserver/pkg/storage/names/generate.go generated vendored
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@ -1,54 +0,0 @@
/*
Copyright 2014 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package names
import (
"fmt"
utilrand "k8s.io/apimachinery/pkg/util/rand"
)
// NameGenerator generates names for objects. Some backends may have more information
// available to guide selection of new names and this interface hides those details.
type NameGenerator interface {
// GenerateName generates a valid name from the base name, adding a random suffix to
// the base. If base is valid, the returned name must also be valid. The generator is
// responsible for knowing the maximum valid name length.
GenerateName(base string) string
}
// simpleNameGenerator generates random names.
type simpleNameGenerator struct{}
// SimpleNameGenerator is a generator that returns the name plus a random suffix of five alphanumerics
// when a name is requested. The string is guaranteed to not exceed the length of a standard Kubernetes
// name (63 characters)
var SimpleNameGenerator NameGenerator = simpleNameGenerator{}
const (
// TODO: make this flexible for non-core resources with alternate naming rules.
maxNameLength = 63
randomLength = 5
MaxGeneratedNameLength = maxNameLength - randomLength
)
func (simpleNameGenerator) GenerateName(base string) string {
if len(base) > MaxGeneratedNameLength {
base = base[:MaxGeneratedNameLength]
}
return fmt.Sprintf("%s%s", base, utilrand.String(randomLength))
}

4
vendor/modules.txt vendored
View File

@ -1143,7 +1143,6 @@ k8s.io/apimachinery/pkg/util/managedfields/internal
k8s.io/apimachinery/pkg/util/naming
k8s.io/apimachinery/pkg/util/net
k8s.io/apimachinery/pkg/util/proxy
k8s.io/apimachinery/pkg/util/rand
k8s.io/apimachinery/pkg/util/remotecommand
k8s.io/apimachinery/pkg/util/runtime
k8s.io/apimachinery/pkg/util/sets
@ -1155,9 +1154,6 @@ k8s.io/apimachinery/pkg/version
k8s.io/apimachinery/pkg/watch
k8s.io/apimachinery/third_party/forked/golang/netutil
k8s.io/apimachinery/third_party/forked/golang/reflect
# k8s.io/apiserver v0.29.2
## explicit; go 1.21
k8s.io/apiserver/pkg/storage/names
# k8s.io/client-go v0.29.2
## explicit; go 1.21
k8s.io/client-go/applyconfigurations/admissionregistration/v1