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convert.go
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convert.go
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package kompose
import (
"fmt"
"os"
"strconv"
"strings"
"github.com/kubernetes/kompose/pkg/app"
"github.com/kubernetes/kompose/pkg/kobject"
"github.com/kubernetes/kompose/pkg/loader"
"github.com/kubernetes/kompose/pkg/transformer"
"github.com/kubernetes/kompose/pkg/transformer/kubernetes"
"github.com/kubernetes/kompose/pkg/transformer/openshift"
"github.com/layer5io/meshkit/utils"
"gopkg.in/yaml.v2"
)
var (
list = "List"
)
const DefaultDockerComposeSchemaURL = "https://raw.githubusercontent.com/compose-spec/compose-spec/master/schema/compose-spec.json"
// Checks whether the given manifest is a valid docker-compose file.
// schemaURL is assigned a default url if not specified
// error will be 'nil' if it is a valid docker compose file
func IsManifestADockerCompose(manifest []byte, schemaURL string) error {
if schemaURL == "" {
schemaURL = DefaultDockerComposeSchemaURL
}
schema, err := utils.ReadRemoteFile(schemaURL)
if err != nil {
return err
}
var dockerComposeFile DockerComposeFile = manifest
err = dockerComposeFile.Validate([]byte(schema))
return err
}
// converts a given docker-compose file into kubernetes manifests
// expects a validated docker-compose file
func Convert(dockerCompose DockerComposeFile) (string, error) {
err := utils.CreateFile(dockerCompose, "temp.data", "./")
if err != nil {
return "", ErrCvrtKompose(err)
}
defer func() {
os.Remove("temp.data")
os.Remove("result.yaml")
}()
formatComposeFile(&dockerCompose)
err = versionCheck(dockerCompose)
if err != nil {
return "", ErrCvrtKompose(err)
}
ConvertOpt := kobject.ConvertOptions{
ToStdout: false,
CreateChart: false, // for helm charts
GenerateYaml: true,
GenerateJSON: false,
Replicas: 1,
InputFiles: []string{"temp.data"},
OutFile: "result.yaml",
Provider: "kubernetes",
CreateD: false,
CreateDS: false, CreateRC: false,
Build: "none",
BuildRepo: "",
BuildBranch: "",
PushImage: false,
PushImageRegistry: "",
CreateDeploymentConfig: true,
EmptyVols: false,
Volumes: "persistentVolumeClaim",
PVCRequestSize: "",
InsecureRepository: false,
IsDeploymentFlag: false,
IsDaemonSetFlag: false,
IsReplicationControllerFlag: false,
Controller: "",
IsReplicaSetFlag: false,
IsDeploymentConfigFlag: false,
YAMLIndent: 2,
WithKomposeAnnotation: true,
MultipleContainerMode: false,
ServiceGroupMode: "",
ServiceGroupName: "",
}
err = convert(ConvertOpt)
if err != nil {
return "", err
}
result, err := os.ReadFile("result.yaml")
if err != nil {
return "", ErrCvrtKompose(err)
}
formattedResult, err := formatConvertedManifest(string(result))
if err != nil {
return "", ErrCvrtKompose(err)
}
return formattedResult, nil
}
func formatConvertedManifest(k8sMan string) (string, error) {
formattedManifest := ""
manifest := map[string]interface{}{}
if err := yaml.Unmarshal([]byte(k8sMan), &manifest); err != nil {
return "", err
}
if manifest["kind"] == list {
items := manifest["items"].([]interface{})
tempMans := []string{}
for _, resMan := range items {
res, err := yaml.Marshal(&resMan)
if err != nil {
return formattedManifest, nil
}
tempMans = append(tempMans, string(res))
}
formattedManifest = strings.Join(tempMans, "\n---\n")
}
return formattedManifest, nil
}
type composeFile struct {
Version string `yaml:"version,omitempty"`
}
// checks if the version is compatible with `kompose`
// expects a valid docker compose yaml
// error = nil means it is compatible
func versionCheck(dc DockerComposeFile) error {
cf := composeFile{}
err := yaml.Unmarshal(dc, &cf)
if err != nil {
return utils.ErrUnmarshal(err)
}
if cf.Version == "" {
return ErrNoVersion()
}
versionFloatVal, err := strconv.ParseFloat(cf.Version, 64)
if err != nil {
return utils.ErrExpectedTypeMismatch(err, "float")
} else {
if versionFloatVal > 3.3 {
// kompose throws a fatal error when version exceeds 3.3
// need this till this PR gets merged https://github.com/kubernetes/kompose/pull/1440(move away from libcompose to compose-go)
return ErrIncompatibleVersion()
}
}
return nil
}
// formatComposeFile takes in a pointer to the compose file byte array and formats it so that it is compatible with `Kompose`
// it expects a validated docker compose file and does not validate
func formatComposeFile(yamlManifest *DockerComposeFile) {
data := composeFile{}
err := yaml.Unmarshal(*yamlManifest, &data)
if err != nil {
return
}
// so that "3.3" and 3.3 are treated differently by `Kompose`
out, err := yaml.Marshal(data)
if err != nil {
return
}
*yamlManifest = out
}
var inputFormat = "compose"
func convert(opt kobject.ConvertOptions) error {
err := validateControllers(&opt)
if err != nil {
return err
}
// loader parses input from file into komposeObject.
l, err := loader.GetLoader(inputFormat)
if err != nil {
return err
}
komposeObject, err := l.LoadFile(opt.InputFiles)
if err != nil {
return err
}
// Get a transformer that maps komposeObject to provider's primitives
t := getTransformer(opt)
// Do the transformation
objects, err := t.Transform(komposeObject, opt)
if err != nil {
return err
}
// Print output
err = kubernetes.PrintList(objects, opt)
if err != nil {
return err
}
return nil
}
// Convenience method to return the appropriate Transformer based on
// what provider we are using.
func getTransformer(opt kobject.ConvertOptions) transformer.Transformer {
var t transformer.Transformer
if opt.Provider == app.DefaultProvider {
// Create/Init new Kubernetes object with CLI opts
t = &kubernetes.Kubernetes{Opt: opt}
} else {
// Create/Init new OpenShift object that is initialized with a newly
// created Kubernetes object. Openshift inherits from Kubernetes
t = &openshift.OpenShift{Kubernetes: kubernetes.Kubernetes{Opt: opt}}
}
return t
}
func validateControllers(opt *kobject.ConvertOptions) error {
singleOutput := len(opt.OutFile) != 0 || opt.OutFile == "-" || opt.ToStdout
if opt.Provider == app.ProviderKubernetes {
// create deployment by default if no controller has been set
if !opt.CreateD && !opt.CreateDS && !opt.CreateRC && opt.Controller == "" {
opt.CreateD = true
}
if singleOutput {
count := 0
if opt.CreateD {
count++
}
if opt.CreateDS {
count++
}
if opt.CreateRC {
count++
}
if count > 1 {
return fmt.Errorf("Error: only one kind of Kubernetes resource can be generated when --out or --stdout is specified")
}
}
} else if opt.Provider == app.ProviderOpenshift {
// create deploymentconfig by default if no controller has been set
if !opt.CreateDeploymentConfig {
opt.CreateDeploymentConfig = true
}
if singleOutput {
count := 0
if opt.CreateDeploymentConfig {
count++
}
// Add more controllers here once they are available in OpenShift
// if opt.foo {count++}
if count > 1 {
return fmt.Errorf("Error: only one kind of OpenShift resource can be generated when --out or --stdout is specified")
}
}
}
return nil
}