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build_num_gen.go
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build_num_gen.go
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// Package buildnum contains stuff to do with generating build numbers.
package buildnum
import (
"strconv"
"strings"
"sync"
"github.com/jenkins-x/jx/pkg/client/clientset/versioned"
jenkinsv1 "github.com/jenkins-x/jx/pkg/apis/jenkins.io/v1"
v1 "github.com/jenkins-x/jx/pkg/client/clientset/versioned/typed/jenkins.io/v1"
"github.com/jenkins-x/jx/pkg/kube"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
// PipelineActivityBuildNumGen generates build numbers backed by PipelineActivity K8S CRDs.
type PipelineActivityBuildNumGen struct {
//Protect access to pipelineMutexes map.
mutex *sync.Mutex
//pipelineID->Mutex to serialise build number generation for a given pipeline ID.
pipelineMutexes map[string]*sync.Mutex
activitiesGetter v1.PipelineActivityInterface
pipelineCache *kube.PipelineNamespaceCache
}
// NewCRDBuildNumGen initialises a new PipelineActivityBuildNumGen that will use the supplied
// PipelineActivityInterface to query CRDs.
func NewCRDBuildNumGen(jxClient versioned.Interface, ns string) *PipelineActivityBuildNumGen {
return &PipelineActivityBuildNumGen{
mutex: &sync.Mutex{},
pipelineMutexes: make(map[string]*sync.Mutex),
pipelineCache: kube.NewPipelineCache(jxClient, ns),
activitiesGetter: jxClient.JenkinsV1().PipelineActivities(ns),
}
}
// Ready returns true if the generator's cache has done its initial load.
func (g *PipelineActivityBuildNumGen) Ready() bool {
return g.pipelineCache.Ready()
}
// NextBuildNumber returns the next build number for the specified pipeline ID, storing the sequence in K8S.
// Returns the build number, or an error if there is a problem with K8S resources.
func (g *PipelineActivityBuildNumGen) NextBuildNumber(pipeline kube.PipelineID) (string, error) {
//Shouldn't happen in practice, but lock to avoid corruption if we somehow generated >1 build number for the same
//pipeline concurrently.
g.mutex.Lock()
defer g.mutex.Unlock()
//Scan cached pipelines recording the highest yet build number.
calc := buildNumCalc{pipeline: pipeline}
g.pipelineCache.ForEach(calc.processPipelineActivity)
nextBuild := strconv.Itoa(calc.lastBuildNum + 1)
name := pipeline.GetActivityName(nextBuild)
//Save this build number before returning.
a := &jenkinsv1.PipelineActivity{
ObjectMeta: metav1.ObjectMeta{
Name: name,
},
Spec: jenkinsv1.PipelineActivitySpec{
Build: nextBuild,
Pipeline: pipeline.ID,
},
}
answer, err := g.activitiesGetter.Create(a)
if err != nil {
return "", err
}
return answer.Spec.Build, nil
}
// buildNumCalc provides a callback to traverse all cached PipelineActivities, finding & recording the highest build
// number encountered.
type buildNumCalc struct {
pipeline kube.PipelineID
lastBuildNum int
}
// processPipelineActivity records the PipelineActivity with the highest build number in its spec.
func (b *buildNumCalc) processPipelineActivity(activity *jenkinsv1.PipelineActivity) {
if strings.EqualFold(activity.Spec.Pipeline, b.pipeline.ID) {
build := activity.Spec.Build
if build != "" {
bi, err := strconv.Atoi(build)
if err == nil {
if bi > b.lastBuildNum {
b.lastBuildNum = bi
}
}
}
}
}