/
scheduler.go
396 lines (376 loc) · 11.4 KB
/
scheduler.go
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package scheduler
import (
"context"
"encoding/json"
"fmt"
"strconv"
"strings"
"github.com/buildkite/agent-stack-k8s/api"
"github.com/buildkite/agent-stack-k8s/monitor"
"github.com/buildkite/agent/v3/clicommand"
"go.uber.org/zap"
batchv1 "k8s.io/api/batch/v1"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/selection"
"k8s.io/client-go/informers"
"k8s.io/client-go/kubernetes"
"k8s.io/utils/pointer"
)
const (
agentTokenKey = "BUILDKITE_AGENT_TOKEN"
AgentContainerName = "agent"
)
func New(logger *zap.Logger, client kubernetes.Interface, cfg api.Config) *worker {
return &worker{
cfg: cfg,
client: client,
logger: logger.Named("worker"),
}
}
// returns an informer factory configured to watch resources (pods, jobs) created by the scheduler
func NewInformerFactory(k8s kubernetes.Interface, tags []string) (informers.SharedInformerFactory, error) {
hasTag, err := labels.NewRequirement(api.TagLabel, selection.In, api.TagsToLabels(tags))
if err != nil {
return nil, fmt.Errorf("failed to build tag label selector for job manager: %w", err)
}
hasUUID, err := labels.NewRequirement(api.UUIDLabel, selection.Exists, nil)
if err != nil {
return nil, fmt.Errorf("failed to build uuid label selector for job manager: %w", err)
}
factory := informers.NewSharedInformerFactoryWithOptions(k8s, 0, informers.WithTweakListOptions(func(opt *metav1.ListOptions) {
opt.LabelSelector = labels.NewSelector().Add(*hasTag, *hasUUID).String()
}))
return factory, nil
}
type KubernetesPlugin struct {
PodSpec *corev1.PodSpec
GitEnvFrom []corev1.EnvFromSource
Sidecars []corev1.Container `json:"sidecars,omitempty"`
Metadata Metadata
}
type Metadata struct {
Annotations map[string]string
Labels map[string]string
}
type worker struct {
cfg api.Config
client kubernetes.Interface
logger *zap.Logger
}
func (w *worker) Create(ctx context.Context, job *monitor.Job) error {
logger := w.logger.With(zap.String("uuid", job.Uuid))
logger.Info("creating job")
jobWrapper := NewJobWrapper(w.logger, job, w.cfg).ParsePlugins()
kjob, err := jobWrapper.Build()
if err != nil {
kjob, err = jobWrapper.BuildFailureJob(err)
if err != nil {
return fmt.Errorf("failed to create job: %w", err)
}
}
_, err = w.client.BatchV1().Jobs(w.cfg.Namespace).Create(ctx, kjob, metav1.CreateOptions{})
if err != nil {
if errors.IsInvalid(err) {
kjob, err = jobWrapper.BuildFailureJob(err)
if err != nil {
return fmt.Errorf("failed to create job: %w", err)
}
_, err = w.client.BatchV1().Jobs(w.cfg.Namespace).Create(ctx, kjob, metav1.CreateOptions{})
if err != nil {
return fmt.Errorf("failed to create job: %w", err)
}
return nil
} else {
return err
}
}
return nil
}
type jobWrapper struct {
logger *zap.Logger
job *monitor.Job
envMap map[string]string
err error
k8sPlugin KubernetesPlugin
otherPlugins []map[string]json.RawMessage
cfg api.Config
}
func NewJobWrapper(logger *zap.Logger, job *monitor.Job, config api.Config) *jobWrapper {
return &jobWrapper{
logger: logger,
job: job,
cfg: config,
envMap: make(map[string]string),
}
}
func (w *jobWrapper) ParsePlugins() *jobWrapper {
for _, val := range w.job.Env {
parts := strings.SplitN(val, "=", 2)
w.envMap[parts[0]] = parts[1]
}
var plugins []map[string]json.RawMessage
if pluginsJson, ok := w.envMap["BUILDKITE_PLUGINS"]; ok {
if err := json.Unmarshal([]byte(pluginsJson), &plugins); err != nil {
w.logger.Debug("invalid plugin spec", zap.String("json", pluginsJson))
w.err = fmt.Errorf("failed parsing plugins: %w", err)
return w
}
}
for _, plugin := range plugins {
if len(plugin) != 1 {
w.err = fmt.Errorf("found invalid plugin: %v", plugin)
return w
}
if val, ok := plugin["github.com/buildkite-plugins/kubernetes-buildkite-plugin"]; ok {
if err := json.Unmarshal(val, &w.k8sPlugin); err != nil {
w.err = fmt.Errorf("failed parsing Kubernetes plugin: %w", err)
return w
}
} else {
for k, v := range plugin {
w.otherPlugins = append(w.otherPlugins, map[string]json.RawMessage{k: v})
}
}
}
return w
}
func (w *jobWrapper) Build() (*batchv1.Job, error) {
// if previous steps have failed, error immediately
if w.err != nil {
return nil, w.err
}
kjob := &batchv1.Job{}
kjob.Name = kjobName(w.job)
if w.k8sPlugin.PodSpec != nil {
kjob.Spec.Template.Spec = *w.k8sPlugin.PodSpec
} else {
kjob.Spec.Template.Spec.Containers = []corev1.Container{
{
Image: w.cfg.Image,
Command: []string{w.job.Command},
},
}
}
if w.k8sPlugin.Metadata.Labels == nil {
w.k8sPlugin.Metadata.Labels = map[string]string{}
w.k8sPlugin.Metadata.Annotations = map[string]string{}
}
w.k8sPlugin.Metadata.Labels[api.UUIDLabel] = w.job.Uuid
w.k8sPlugin.Metadata.Labels[api.TagLabel] = api.TagToLabel(w.job.Tag)
w.k8sPlugin.Metadata.Annotations[api.BuildURLAnnotation] = w.envMap["BUILDKITE_BUILD_URL"]
kjob.Labels = w.k8sPlugin.Metadata.Labels
kjob.Spec.Template.Labels = w.k8sPlugin.Metadata.Labels
kjob.Annotations = w.k8sPlugin.Metadata.Annotations
kjob.Spec.Template.Annotations = w.k8sPlugin.Metadata.Annotations
kjob.Spec.BackoffLimit = pointer.Int32(0)
env := []corev1.EnvVar{
{
Name: "BUILDKITE_BUILD_PATH",
Value: "/workspace/build",
}, {
Name: "BUILDKITE_BIN_PATH",
Value: "/workspace",
}, {
Name: agentTokenKey,
ValueFrom: &corev1.EnvVarSource{
SecretKeyRef: &corev1.SecretKeySelector{
LocalObjectReference: corev1.LocalObjectReference{Name: w.cfg.AgentTokenSecret},
Key: agentTokenKey,
},
},
}, {
Name: "BUILDKITE_AGENT_ACQUIRE_JOB",
Value: w.job.Uuid,
},
}
if w.otherPlugins != nil {
otherPluginsJson, err := json.Marshal(w.otherPlugins)
if err != nil {
return nil, fmt.Errorf("failed to remarshal non-k8s plugins: %w", err)
}
env = append(env, corev1.EnvVar{
Name: "BUILDKITE_PLUGINS",
Value: string(otherPluginsJson),
})
}
for k, v := range w.envMap {
switch k {
case "BUILDKITE_COMMAND", "BUILDKITE_ARTIFACT_PATHS", "BUILDKITE_PLUGINS": //noop
default:
env = append(env, corev1.EnvVar{Name: k, Value: v})
}
}
volumeMounts := []corev1.VolumeMount{{Name: "workspace", MountPath: "/workspace"}}
const systemContainers = 1
ttl := int32(w.cfg.JobTTL.Seconds())
kjob.Spec.TTLSecondsAfterFinished = &ttl
podSpec := &kjob.Spec.Template.Spec
for i, c := range podSpec.Containers {
command := strings.Join(append(c.Command, c.Args...), " ")
c.Command = []string{"/workspace/buildkite-agent"}
c.Args = []string{"bootstrap"}
c.ImagePullPolicy = corev1.PullAlways
c.Env = append(c.Env, env...)
c.Env = append(c.Env, corev1.EnvVar{
Name: "BUILDKITE_COMMAND",
Value: command,
}, corev1.EnvVar{
Name: "BUILDKITE_AGENT_EXPERIMENT",
Value: "kubernetes-exec",
}, corev1.EnvVar{
Name: "BUILDKITE_BOOTSTRAP_PHASES",
Value: "plugin,command",
}, corev1.EnvVar{
Name: "BUILDKITE_AGENT_NAME",
Value: "buildkite",
}, corev1.EnvVar{
Name: "BUILDKITE_CONTAINER_ID",
Value: strconv.Itoa(i + systemContainers),
}, corev1.EnvVar{
Name: "BUILDKITE_PLUGINS_PATH",
Value: "/tmp",
}, corev1.EnvVar{
Name: clicommand.RedactedVars.EnvVar,
Value: strings.Join(clicommand.RedactedVars.Value.Value(), ","),
})
if c.Name == "" {
c.Name = fmt.Sprintf("%s-%d", "container", i)
}
if c.WorkingDir == "" {
c.WorkingDir = "/workspace"
}
c.VolumeMounts = append(c.VolumeMounts, volumeMounts...)
c.EnvFrom = append(c.EnvFrom, w.k8sPlugin.GitEnvFrom...)
podSpec.Containers[i] = c
}
containerCount := len(podSpec.Containers) + systemContainers
for i, c := range w.k8sPlugin.Sidecars {
if c.Name == "" {
c.Name = fmt.Sprintf("%s-%d", "sidecar", i)
}
c.VolumeMounts = append(c.VolumeMounts, volumeMounts...)
c.EnvFrom = append(c.EnvFrom, w.k8sPlugin.GitEnvFrom...)
podSpec.Containers = append(podSpec.Containers, c)
}
if artifactPaths, found := w.envMap["BUILDKITE_ARTIFACT_PATHS"]; found && artifactPaths != "" {
artifactsContainer := corev1.Container{
Name: "upload-artifacts",
Image: w.cfg.Image,
Args: []string{"bootstrap"},
WorkingDir: "/workspace",
VolumeMounts: volumeMounts,
ImagePullPolicy: corev1.PullAlways,
Env: []corev1.EnvVar{{
Name: "BUILDKITE_AGENT_EXPERIMENT",
Value: "kubernetes-exec",
}, {
Name: "BUILDKITE_BOOTSTRAP_PHASES",
Value: "command",
}, {
Name: "BUILDKITE_COMMAND",
Value: "true",
}, {
Name: "BUILDKITE_AGENT_NAME",
Value: "buildkite",
}, {
Name: "BUILDKITE_CONTAINER_ID",
Value: strconv.Itoa(containerCount),
}, {
Name: "BUILDKITE_ARTIFACT_PATHS",
Value: artifactPaths,
}},
}
artifactsContainer.Env = append(artifactsContainer.Env, env...)
containerCount++
podSpec.Containers = append(podSpec.Containers, artifactsContainer)
}
// agent server container
agentContainer := corev1.Container{
Name: AgentContainerName,
Args: []string{"start"},
Image: w.cfg.Image,
WorkingDir: "/workspace",
VolumeMounts: volumeMounts,
ImagePullPolicy: corev1.PullAlways,
Env: []corev1.EnvVar{
{
Name: "BUILDKITE_AGENT_EXPERIMENT",
Value: "kubernetes-exec",
}, {
Name: "BUILDKITE_CONTAINER_COUNT",
Value: strconv.Itoa(containerCount),
},
},
}
agentContainer.Env = append(agentContainer.Env, env...)
// system client container(s)
checkoutContainer := corev1.Container{
Name: "checkout",
Image: w.cfg.Image,
Args: []string{"bootstrap"},
WorkingDir: "/workspace",
VolumeMounts: volumeMounts,
ImagePullPolicy: corev1.PullAlways,
Env: []corev1.EnvVar{{
Name: "BUILDKITE_AGENT_EXPERIMENT",
Value: "kubernetes-exec",
}, {
Name: "BUILDKITE_BOOTSTRAP_PHASES",
Value: "checkout,command",
}, {
Name: "BUILDKITE_AGENT_NAME",
Value: "buildkite",
}, {
Name: "BUILDKITE_CONTAINER_ID",
Value: "0",
}, {
Name: "BUILDKITE_COMMAND",
Value: "cp -r ~/.ssh /workspace/.ssh && chmod -R 777 /workspace",
}},
EnvFrom: w.k8sPlugin.GitEnvFrom,
}
checkoutContainer.Env = append(checkoutContainer.Env, env...)
podSpec.Containers = append(podSpec.Containers, agentContainer, checkoutContainer)
podSpec.InitContainers = append(podSpec.InitContainers, corev1.Container{
Name: "copy-agent",
Image: w.cfg.Image,
ImagePullPolicy: corev1.PullAlways,
Command: []string{"cp"},
Args: []string{"/usr/local/bin/buildkite-agent", "/usr/local/bin/ssh-env-config.sh", "/workspace"},
VolumeMounts: []corev1.VolumeMount{
{
Name: "workspace",
MountPath: "/workspace",
},
},
})
podSpec.Volumes = append(podSpec.Volumes, corev1.Volume{
Name: "workspace",
VolumeSource: corev1.VolumeSource{
EmptyDir: &corev1.EmptyDirVolumeSource{},
},
})
podSpec.RestartPolicy = corev1.RestartPolicyNever
return kjob, nil
}
func (w *jobWrapper) BuildFailureJob(err error) (*batchv1.Job, error) {
w.err = nil
w.k8sPlugin = KubernetesPlugin{
PodSpec: &corev1.PodSpec{
Containers: []corev1.Container{
{
Image: w.cfg.Image,
Command: []string{fmt.Sprintf("echo %q && exit 1", err.Error())},
},
},
},
}
w.otherPlugins = nil
return w.Build()
}
func kjobName(job *monitor.Job) string {
return fmt.Sprintf("buildkite-%s", job.Uuid)
}