/
convert.go
578 lines (531 loc) · 16.2 KB
/
convert.go
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package kubernetes
import (
"io"
"io/ioutil"
"regexp"
"strconv"
"strings"
"github.com/docker/cli/cli/compose/loader"
"github.com/docker/cli/cli/compose/schema"
composeTypes "github.com/docker/cli/cli/compose/types"
composetypes "github.com/docker/cli/cli/compose/types"
latest "github.com/docker/compose-on-kubernetes/api/compose/v1alpha3"
"github.com/docker/compose-on-kubernetes/api/compose/v1beta1"
"github.com/docker/compose-on-kubernetes/api/compose/v1beta2"
"github.com/docker/go-connections/nat"
"github.com/mitchellh/mapstructure"
"github.com/pkg/errors"
yaml "gopkg.in/yaml.v2"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
const (
// kubernatesExtraField is an extra field on ServiceConfigs containing kubernetes-specific extensions to compose format
kubernatesExtraField = "x-kubernetes"
)
// NewStackConverter returns a converter from types.Config (compose) to the specified
// stack version or error out if the version is not supported or existent.
func NewStackConverter(version string) (StackConverter, error) {
switch version {
case "v1beta1":
return stackV1Beta1Converter{}, nil
case "v1beta2":
return stackV1Beta2Converter{}, nil
case "v1alpha3":
return stackV1Alpha3Converter{}, nil
default:
return nil, errors.Errorf("stack version %s unsupported", version)
}
}
// StackConverter converts a compose types.Config to a Stack
type StackConverter interface {
FromCompose(stderr io.Writer, name string, cfg *composetypes.Config) (Stack, error)
}
type stackV1Beta1Converter struct{}
func (s stackV1Beta1Converter) FromCompose(stderr io.Writer, name string, cfg *composetypes.Config) (Stack, error) {
cfg.Version = v1beta1.MaxComposeVersion
st, err := fromCompose(stderr, name, cfg, v1beta1Capabilities)
if err != nil {
return Stack{}, err
}
res, err := yaml.Marshal(cfg)
if err != nil {
return Stack{}, err
}
// reload the result to check that it produced a valid 3.5 compose file
resparsedConfig, err := loader.ParseYAML(res)
if err != nil {
return Stack{}, err
}
if err = schema.Validate(resparsedConfig, v1beta1.MaxComposeVersion); err != nil {
return Stack{}, errors.Wrapf(err, "the compose yaml file is invalid with v%s", v1beta1.MaxComposeVersion)
}
st.ComposeFile = string(res)
return st, nil
}
type stackV1Beta2Converter struct{}
func (s stackV1Beta2Converter) FromCompose(stderr io.Writer, name string, cfg *composetypes.Config) (Stack, error) {
return fromCompose(stderr, name, cfg, v1beta2Capabilities)
}
type stackV1Alpha3Converter struct{}
func (s stackV1Alpha3Converter) FromCompose(stderr io.Writer, name string, cfg *composetypes.Config) (Stack, error) {
return fromCompose(stderr, name, cfg, v1alpha3Capabilities)
}
func fromCompose(stderr io.Writer, name string, cfg *composetypes.Config, capabilities composeCapabilities) (Stack, error) {
spec, err := fromComposeConfig(stderr, cfg, capabilities)
if err != nil {
return Stack{}, err
}
return Stack{
Name: name,
Spec: spec,
}, nil
}
func loadStackData(composefile string) (*composetypes.Config, error) {
parsed, err := loader.ParseYAML([]byte(composefile))
if err != nil {
return nil, err
}
return loader.Load(composetypes.ConfigDetails{
ConfigFiles: []composetypes.ConfigFile{
{
Config: parsed,
},
},
})
}
// Conversions from internal stack to different stack compose component versions.
func stackFromV1beta1(in *v1beta1.Stack) (Stack, error) {
cfg, err := loadStackData(in.Spec.ComposeFile)
if err != nil {
return Stack{}, err
}
spec, err := fromComposeConfig(ioutil.Discard, cfg, v1beta1Capabilities)
if err != nil {
return Stack{}, err
}
return Stack{
Name: in.ObjectMeta.Name,
Namespace: in.ObjectMeta.Namespace,
ComposeFile: in.Spec.ComposeFile,
Spec: spec,
}, nil
}
func stackToV1beta1(s Stack) *v1beta1.Stack {
return &v1beta1.Stack{
ObjectMeta: metav1.ObjectMeta{
Name: s.Name,
},
Spec: v1beta1.StackSpec{
ComposeFile: s.ComposeFile,
},
}
}
func stackFromV1beta2(in *v1beta2.Stack) (Stack, error) {
var spec *latest.StackSpec
if in.Spec != nil {
spec = &latest.StackSpec{}
if err := latest.Convert_v1beta2_StackSpec_To_v1alpha3_StackSpec(in.Spec, spec, nil); err != nil {
return Stack{}, err
}
}
return Stack{
Name: in.ObjectMeta.Name,
Namespace: in.ObjectMeta.Namespace,
Spec: spec,
}, nil
}
func stackToV1beta2(s Stack) (*v1beta2.Stack, error) {
var spec *v1beta2.StackSpec
if s.Spec != nil {
spec = &v1beta2.StackSpec{}
if err := latest.Convert_v1alpha3_StackSpec_To_v1beta2_StackSpec(s.Spec, spec, nil); err != nil {
return nil, err
}
}
return &v1beta2.Stack{
ObjectMeta: metav1.ObjectMeta{
Name: s.Name,
},
Spec: spec,
}, nil
}
func stackFromV1alpha3(in *latest.Stack) Stack {
return Stack{
Name: in.ObjectMeta.Name,
Namespace: in.ObjectMeta.Namespace,
Spec: in.Spec,
}
}
func stackToV1alpha3(s Stack) *latest.Stack {
return &latest.Stack{
ObjectMeta: metav1.ObjectMeta{
Name: s.Name,
},
Spec: s.Spec,
}
}
func fromComposeConfig(stderr io.Writer, c *composeTypes.Config, capabilities composeCapabilities) (*latest.StackSpec, error) {
if c == nil {
return nil, nil
}
warnUnsupportedFeatures(stderr, c)
serviceConfigs := make([]latest.ServiceConfig, len(c.Services))
for i, s := range c.Services {
svc, err := fromComposeServiceConfig(s, capabilities)
if err != nil {
return nil, err
}
serviceConfigs[i] = svc
}
return &latest.StackSpec{
Services: serviceConfigs,
Secrets: fromComposeSecrets(c.Secrets),
Configs: fromComposeConfigs(c.Configs),
}, nil
}
func fromComposeSecrets(s map[string]composeTypes.SecretConfig) map[string]latest.SecretConfig {
if s == nil {
return nil
}
m := map[string]latest.SecretConfig{}
for key, value := range s {
m[key] = latest.SecretConfig{
Name: value.Name,
File: value.File,
External: latest.External{
Name: value.External.Name,
External: value.External.External,
},
Labels: value.Labels,
}
}
return m
}
func fromComposeConfigs(s map[string]composeTypes.ConfigObjConfig) map[string]latest.ConfigObjConfig {
if s == nil {
return nil
}
m := map[string]latest.ConfigObjConfig{}
for key, value := range s {
m[key] = latest.ConfigObjConfig{
Name: value.Name,
File: value.File,
External: latest.External{
Name: value.External.Name,
External: value.External.External,
},
Labels: value.Labels,
}
}
return m
}
func fromComposeServiceConfig(s composeTypes.ServiceConfig, capabilities composeCapabilities) (latest.ServiceConfig, error) {
var (
userID *int64
err error
)
if s.User != "" {
numerical, err := strconv.Atoi(s.User)
if err == nil {
unixUserID := int64(numerical)
userID = &unixUserID
}
}
kubeExtra, err := resolveServiceExtra(s)
if err != nil {
return latest.ServiceConfig{}, err
}
if kubeExtra.PullSecret != "" && !capabilities.hasPullSecrets {
return latest.ServiceConfig{}, errors.Errorf(`stack API version %s does not support pull secrets (field "x-kubernetes.pull_secret"), please use version v1alpha3 or higher`, capabilities.apiVersion)
}
if kubeExtra.PullPolicy != "" && !capabilities.hasPullPolicies {
return latest.ServiceConfig{}, errors.Errorf(`stack API version %s does not support pull policies (field "x-kubernetes.pull_policy"), please use version v1alpha3 or higher`, capabilities.apiVersion)
}
internalPorts, err := setupIntraStackNetworking(s, kubeExtra, capabilities)
if err != nil {
return latest.ServiceConfig{}, err
}
return latest.ServiceConfig{
Name: s.Name,
CapAdd: s.CapAdd,
CapDrop: s.CapDrop,
Command: s.Command,
Configs: fromComposeServiceConfigs(s.Configs),
Deploy: latest.DeployConfig{
Mode: s.Deploy.Mode,
Replicas: s.Deploy.Replicas,
Labels: s.Deploy.Labels,
UpdateConfig: fromComposeUpdateConfig(s.Deploy.UpdateConfig),
Resources: fromComposeResources(s.Deploy.Resources),
RestartPolicy: fromComposeRestartPolicy(s.Deploy.RestartPolicy),
Placement: fromComposePlacement(s.Deploy.Placement),
},
Entrypoint: s.Entrypoint,
Environment: s.Environment,
ExtraHosts: s.ExtraHosts,
Hostname: s.Hostname,
HealthCheck: fromComposeHealthcheck(s.HealthCheck),
Image: s.Image,
Ipc: s.Ipc,
Labels: s.Labels,
Pid: s.Pid,
Ports: fromComposePorts(s.Ports),
Privileged: s.Privileged,
ReadOnly: s.ReadOnly,
Secrets: fromComposeServiceSecrets(s.Secrets),
StdinOpen: s.StdinOpen,
StopGracePeriod: composetypes.ConvertDurationPtr(s.StopGracePeriod),
Tmpfs: s.Tmpfs,
Tty: s.Tty,
User: userID,
Volumes: fromComposeServiceVolumeConfig(s.Volumes),
WorkingDir: s.WorkingDir,
PullSecret: kubeExtra.PullSecret,
PullPolicy: kubeExtra.PullPolicy,
InternalServiceType: kubeExtra.InternalServiceType,
InternalPorts: internalPorts,
}, nil
}
func setupIntraStackNetworking(s composeTypes.ServiceConfig, kubeExtra kubernetesExtra, capabilities composeCapabilities) ([]latest.InternalPort, error) {
if kubeExtra.InternalServiceType != latest.InternalServiceTypeAuto && !capabilities.hasIntraStackLoadBalancing {
return nil,
errors.Errorf(`stack API version %s does not support intra-stack load balancing (field "x-kubernetes.internal_service_type"), please use version v1alpha3 or higher`,
capabilities.apiVersion)
}
if !capabilities.hasIntraStackLoadBalancing {
return nil, nil
}
if err := validateInternalServiceType(kubeExtra.InternalServiceType); err != nil {
return nil, err
}
internalPorts, err := toInternalPorts(s.Expose)
if err != nil {
return nil, err
}
return internalPorts, nil
}
func validateInternalServiceType(internalServiceType latest.InternalServiceType) error {
switch internalServiceType {
case latest.InternalServiceTypeAuto, latest.InternalServiceTypeClusterIP, latest.InternalServiceTypeHeadless:
default:
return errors.Errorf(`invalid value %q for field "x-kubernetes.internal_service_type", valid values are %q or %q`, internalServiceType,
latest.InternalServiceTypeClusterIP,
latest.InternalServiceTypeHeadless)
}
return nil
}
func toInternalPorts(expose []string) ([]latest.InternalPort, error) {
var internalPorts []latest.InternalPort
for _, sourcePort := range expose {
proto, port := nat.SplitProtoPort(sourcePort)
start, end, err := nat.ParsePortRange(port)
if err != nil {
return nil, errors.Errorf("invalid format for expose: %q, error: %s", sourcePort, err)
}
for i := start; i <= end; i++ {
k8sProto := v1.Protocol(strings.ToUpper(proto))
switch k8sProto {
case v1.ProtocolSCTP, v1.ProtocolTCP, v1.ProtocolUDP:
default:
return nil, errors.Errorf("invalid protocol for expose: %q, supported values are %q, %q and %q", sourcePort, v1.ProtocolSCTP, v1.ProtocolTCP, v1.ProtocolUDP)
}
internalPorts = append(internalPorts, latest.InternalPort{
Port: int32(i),
Protocol: k8sProto,
})
}
}
return internalPorts, nil
}
func resolveServiceExtra(s composeTypes.ServiceConfig) (kubernetesExtra, error) {
if iface, ok := s.Extras[kubernatesExtraField]; ok {
var result kubernetesExtra
if err := mapstructure.Decode(iface, &result); err != nil {
return kubernetesExtra{}, err
}
return result, nil
}
return kubernetesExtra{}, nil
}
func fromComposePorts(ports []composeTypes.ServicePortConfig) []latest.ServicePortConfig {
if ports == nil {
return nil
}
p := make([]latest.ServicePortConfig, len(ports))
for i, port := range ports {
p[i] = latest.ServicePortConfig{
Mode: port.Mode,
Target: port.Target,
Published: port.Published,
Protocol: port.Protocol,
}
}
return p
}
func fromComposeServiceSecrets(secrets []composeTypes.ServiceSecretConfig) []latest.ServiceSecretConfig {
if secrets == nil {
return nil
}
c := make([]latest.ServiceSecretConfig, len(secrets))
for i, secret := range secrets {
c[i] = latest.ServiceSecretConfig{
Source: secret.Source,
Target: secret.Target,
UID: secret.UID,
Mode: secret.Mode,
}
}
return c
}
func fromComposeServiceConfigs(configs []composeTypes.ServiceConfigObjConfig) []latest.ServiceConfigObjConfig {
if configs == nil {
return nil
}
c := make([]latest.ServiceConfigObjConfig, len(configs))
for i, config := range configs {
c[i] = latest.ServiceConfigObjConfig{
Source: config.Source,
Target: config.Target,
UID: config.UID,
Mode: config.Mode,
}
}
return c
}
func fromComposeHealthcheck(h *composeTypes.HealthCheckConfig) *latest.HealthCheckConfig {
if h == nil {
return nil
}
return &latest.HealthCheckConfig{
Test: h.Test,
Timeout: composetypes.ConvertDurationPtr(h.Timeout),
Interval: composetypes.ConvertDurationPtr(h.Interval),
Retries: h.Retries,
}
}
func fromComposePlacement(p composeTypes.Placement) latest.Placement {
return latest.Placement{
Constraints: fromComposeConstraints(p.Constraints),
}
}
var constraintEquals = regexp.MustCompile(`([\w\.]*)\W*(==|!=)\W*([\w\.]*)`)
const (
swarmOs = "node.platform.os"
swarmArch = "node.platform.arch"
swarmHostname = "node.hostname"
swarmLabelPrefix = "node.labels."
)
func fromComposeConstraints(s []string) *latest.Constraints {
if len(s) == 0 {
return nil
}
constraints := &latest.Constraints{}
for _, constraint := range s {
matches := constraintEquals.FindStringSubmatch(constraint)
if len(matches) == 4 {
key := matches[1]
operator := matches[2]
value := matches[3]
constraint := &latest.Constraint{
Operator: operator,
Value: value,
}
switch {
case key == swarmOs:
constraints.OperatingSystem = constraint
case key == swarmArch:
constraints.Architecture = constraint
case key == swarmHostname:
constraints.Hostname = constraint
case strings.HasPrefix(key, swarmLabelPrefix):
if constraints.MatchLabels == nil {
constraints.MatchLabels = map[string]latest.Constraint{}
}
constraints.MatchLabels[strings.TrimPrefix(key, swarmLabelPrefix)] = *constraint
}
}
}
return constraints
}
func fromComposeResources(r composeTypes.Resources) latest.Resources {
return latest.Resources{
Limits: fromComposeResourcesResourceLimit(r.Limits),
Reservations: fromComposeResourcesResource(r.Reservations),
}
}
// TODO create ResourceLimit type and support for limiting Pids on k8s
func fromComposeResourcesResourceLimit(r *composeTypes.ResourceLimit) *latest.Resource {
if r == nil {
return nil
}
return &latest.Resource{
MemoryBytes: int64(r.MemoryBytes),
NanoCPUs: r.NanoCPUs,
}
}
func fromComposeResourcesResource(r *composeTypes.Resource) *latest.Resource {
if r == nil {
return nil
}
return &latest.Resource{
MemoryBytes: int64(r.MemoryBytes),
NanoCPUs: r.NanoCPUs,
}
}
func fromComposeUpdateConfig(u *composeTypes.UpdateConfig) *latest.UpdateConfig {
if u == nil {
return nil
}
return &latest.UpdateConfig{
Parallelism: u.Parallelism,
}
}
func fromComposeRestartPolicy(r *composeTypes.RestartPolicy) *latest.RestartPolicy {
if r == nil {
return nil
}
return &latest.RestartPolicy{
Condition: r.Condition,
}
}
func fromComposeServiceVolumeConfig(vs []composeTypes.ServiceVolumeConfig) []latest.ServiceVolumeConfig {
if vs == nil {
return nil
}
volumes := []latest.ServiceVolumeConfig{}
for _, v := range vs {
volumes = append(volumes, latest.ServiceVolumeConfig{
Type: v.Type,
Source: v.Source,
Target: v.Target,
ReadOnly: v.ReadOnly,
})
}
return volumes
}
var (
v1beta1Capabilities = composeCapabilities{
apiVersion: "v1beta1",
}
v1beta2Capabilities = composeCapabilities{
apiVersion: "v1beta2",
}
v1alpha3Capabilities = composeCapabilities{
apiVersion: "v1alpha3",
hasPullSecrets: true,
hasPullPolicies: true,
hasIntraStackLoadBalancing: true,
}
)
type composeCapabilities struct {
apiVersion string
hasPullSecrets bool
hasPullPolicies bool
hasIntraStackLoadBalancing bool
}
type kubernetesExtra struct {
PullSecret string `mapstructure:"pull_secret"`
PullPolicy string `mapstructure:"pull_policy"`
InternalServiceType latest.InternalServiceType `mapstructure:"internal_service_type"`
}