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resource_kubeapply.go
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/
resource_kubeapply.go
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package kubeapply
import (
"bytes"
"encoding/base64"
"encoding/json"
"fmt"
"io/ioutil"
"os"
_path "path"
"path/filepath"
"strings"
"text/template"
"github.com/Masterminds/sprig"
"github.com/pkg/errors"
"gopkg.in/yaml.v2"
"github.com/datawire/ambassador/pkg/k8s"
"github.com/datawire/ambassador/pkg/supervisor"
)
var readyChecks = map[string]func(k8s.Resource) bool{
"": func(_ k8s.Resource) bool { return false },
"Deployment": func(r k8s.Resource) bool {
// NOTE - plombardi - (2019-05-20)
// a zero-sized deployment never gets status.readyReplicas and friends set by kubernetes deployment controller.
// this effectively short-circuits the wait.
//
// in the future it might be worth porting this change to StatefulSets, ReplicaSets and ReplicationControllers
if r.Spec().GetInt64("replicas") == 0 {
return true
}
return r.Status().GetInt64("readyReplicas") > 0
},
"Service": func(r k8s.Resource) bool {
return true
},
"Pod": func(r k8s.Resource) bool {
css := r.Status().GetMaps("containerStatuses")
for _, cs := range css {
if !k8s.Map(cs).GetBool("ready") {
return false
}
}
return true
},
"Namespace": func(r k8s.Resource) bool {
return r.Status().GetString("phase") == "Active"
},
"ServiceAccount": func(r k8s.Resource) bool {
_, ok := r["secrets"]
return ok
},
"ClusterRole": func(r k8s.Resource) bool {
return true
},
"ClusterRoleBinding": func(r k8s.Resource) bool {
return true
},
"CustomResourceDefinition": func(r k8s.Resource) bool {
conditions := r.Status().GetMaps("conditions")
if len(conditions) == 0 {
return false
}
last := conditions[len(conditions)-1]
return last["status"] == "True"
},
}
// ReadyImplemented returns whether or not this package knows how to
// wait for this resource to be ready.
func ReadyImplemented(r k8s.Resource) bool {
if r.Empty() {
return false
}
kind := r.Kind()
_, ok := readyChecks[kind]
return ok
}
// Ready returns whether or not this resource is ready; if this
// package does not know how to check whether the resource is ready,
// then it returns true.
func Ready(r k8s.Resource) bool {
if r.Empty() {
return false
}
kind := r.Kind()
fn, fnOK := readyChecks[kind]
if !fnOK {
return true
}
return fn(r)
}
func isTemplate(input []byte) bool {
return strings.Contains(string(input), "@TEMPLATE@")
}
func image(dir, dockerfile string) (string, error) {
var result string
errs := supervisor.Run("BLD", func(p *supervisor.Process) error {
iidfile, err := ioutil.TempFile("", "iid")
if err != nil {
return err
}
defer os.Remove(iidfile.Name())
err = iidfile.Close()
if err != nil {
return err
}
ctx := filepath.Dir(filepath.Join(dir, dockerfile))
cmd := p.Command("docker", "build", "-f", filepath.Base(dockerfile), ".", "--iidfile", iidfile.Name())
cmd.Dir = ctx
err = cmd.Run()
if err != nil {
return err
}
content, err := ioutil.ReadFile(iidfile.Name())
if err != nil {
return err
}
iid := strings.Split(strings.TrimSpace(string(content)), ":")[1]
short := iid[:12]
registry := strings.TrimSpace(os.Getenv("DOCKER_REGISTRY"))
if registry == "" {
return errors.Errorf("please set the DOCKER_REGISTRY environment variable")
}
tag := fmt.Sprintf("%s/kubeapply:%s", registry, short)
cmd = p.Command("docker", "tag", iid, tag)
err = cmd.Run()
if err != nil {
return err
}
result = tag
cmd = p.Command("docker", "push", tag)
return cmd.Run()
})
if len(errs) > 0 {
return "", errors.Errorf("errors building %s: %v", dockerfile, errs)
}
return result, nil
}
// ExpandResource takes a path to a YAML file, and returns its
// contents, with any kubeapply templating expanded.
func ExpandResource(path string) (result []byte, err error) {
input, err := ioutil.ReadFile(path)
if err != nil {
return nil, fmt.Errorf("%s: %v", path, err)
}
if isTemplate(input) {
funcs := sprig.TxtFuncMap()
usedImage := false
funcs["image"] = func(dockerfile string) (string, error) {
usedImage = true
return image(filepath.Dir(path), dockerfile)
}
tmpl := template.New(filepath.Base(path)).Funcs(funcs)
_, err := tmpl.Parse(string(input))
if err != nil {
return nil, fmt.Errorf("%s: %v", path, err)
}
buf := bytes.NewBuffer(nil)
err = tmpl.ExecuteTemplate(buf, filepath.Base(path), nil)
if err != nil {
return nil, fmt.Errorf("%s: %v", path, err)
}
result = buf.Bytes()
if usedImage && os.Getenv("DEV_USE_IMAGEPULLSECRET") != "" {
dockercfg, err := json.Marshal(map[string]interface{}{
"auths": map[string]interface{}{
_path.Dir(os.Getenv("DEV_REGISTRY")): map[string]string{
"auth": base64.StdEncoding.EncodeToString([]byte(os.Getenv("DOCKER_BUILD_USERNAME") + ":" + os.Getenv("DOCKER_BUILD_PASSWORD"))),
},
},
})
if err != nil {
return nil, errors.Wrap(err, "DEV_USE_IMAGEPULLSECRET")
}
secretYaml := fmt.Sprintf(`
---
apiVersion: v1
kind: Secret
metadata:
name: dev-image-pull-secret
type: kubernetes.io/dockerconfigjson
data:
".dockerconfigjson": %q
---
apiVersion: v1
kind: ServiceAccount
metadata:
name: default
imagePullSecrets:
- name: dev-image-pull-secret
`, base64.StdEncoding.EncodeToString(dockercfg))
result = append(result, secretYaml...)
}
} else {
result = input
}
return
}
// LoadResources is like ExpandResource, but follows it up by actually
// parsing the YAML.
func LoadResources(path string) (result []k8s.Resource, err error) {
var input []byte
input, err = ExpandResource(path)
if err != nil {
return
}
result, err = k8s.ParseResources(path, string(input))
return
}
// SaveResources serializes a list of k8s.Resources to a YAML file.
func SaveResources(path string, resources []k8s.Resource) error {
output, err := MarshalResources(resources)
if err != nil {
return fmt.Errorf("%s: %v", path, err)
}
err = ioutil.WriteFile(path, output, 0644)
if err != nil {
return fmt.Errorf("%s: %v", path, err)
}
return nil
}
// MarshalResources serializes a list of k8s.Resources in to YAML.
func MarshalResources(resources []k8s.Resource) ([]byte, error) {
buf := bytes.NewBuffer(nil)
e := yaml.NewEncoder(buf)
for _, r := range resources {
err := e.Encode(r)
if err != nil {
return nil, err
}
}
e.Close()
return buf.Bytes(), nil
}