DockerCLI/cli/compose/convert/service.go

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package convert
import (
"fmt"
"os"
"sort"
"strings"
"time"
servicecli "github.com/docker/cli/cli/command/service"
composetypes "github.com/docker/cli/cli/compose/types"
"github.com/docker/cli/opts"
"github.com/docker/docker/api/types/container"
"github.com/docker/docker/api/types/swarm"
"github.com/docker/docker/api/types/versions"
"github.com/docker/docker/client"
"github.com/pkg/errors"
)
const (
defaultNetwork = "default"
// LabelImage is the label used to store image name provided in the compose file
LabelImage = "com.docker.stack.image"
)
// Services from compose-file types to engine API types
func Services(
namespace Namespace,
config *composetypes.Config,
client client.CommonAPIClient,
) (map[string]swarm.ServiceSpec, error) {
result := make(map[string]swarm.ServiceSpec)
services := config.Services
volumes := config.Volumes
networks := config.Networks
for _, service := range services {
secrets, err := convertServiceSecrets(client, namespace, service.Secrets, config.Secrets)
if err != nil {
return nil, errors.Wrapf(err, "service %s", service.Name)
}
configs, err := convertServiceConfigObjs(client, namespace, service.Configs, config.Configs)
if err != nil {
return nil, errors.Wrapf(err, "service %s", service.Name)
}
serviceSpec, err := Service(client.ClientVersion(), namespace, service, networks, volumes, secrets, configs)
if err != nil {
return nil, errors.Wrapf(err, "service %s", service.Name)
}
result[service.Name] = serviceSpec
}
return result, nil
}
// Service converts a ServiceConfig into a swarm ServiceSpec
func Service(
apiVersion string,
namespace Namespace,
service composetypes.ServiceConfig,
networkConfigs map[string]composetypes.NetworkConfig,
volumes map[string]composetypes.VolumeConfig,
secrets []*swarm.SecretReference,
configs []*swarm.ConfigReference,
) (swarm.ServiceSpec, error) {
name := namespace.Scope(service.Name)
endpoint, err := convertEndpointSpec(service.Deploy.EndpointMode, service.Ports)
if err != nil {
return swarm.ServiceSpec{}, err
}
mode, err := convertDeployMode(service.Deploy.Mode, service.Deploy.Replicas)
if err != nil {
return swarm.ServiceSpec{}, err
}
mounts, err := Volumes(service.Volumes, volumes, namespace)
if err != nil {
return swarm.ServiceSpec{}, err
}
resources, err := convertResources(service.Deploy.Resources)
if err != nil {
return swarm.ServiceSpec{}, err
}
restartPolicy, err := convertRestartPolicy(
service.Restart, service.Deploy.RestartPolicy)
if err != nil {
return swarm.ServiceSpec{}, err
}
healthcheck, err := convertHealthcheck(service.HealthCheck)
if err != nil {
return swarm.ServiceSpec{}, err
}
networks, err := convertServiceNetworks(service.Networks, networkConfigs, namespace, service.Name)
if err != nil {
return swarm.ServiceSpec{}, err
}
dnsConfig, err := convertDNSConfig(service.DNS, service.DNSSearch)
if err != nil {
return swarm.ServiceSpec{}, err
}
var privileges swarm.Privileges
privileges.CredentialSpec, err = convertCredentialSpec(service.CredentialSpec)
if err != nil {
return swarm.ServiceSpec{}, err
}
var logDriver *swarm.Driver
if service.Logging != nil {
logDriver = &swarm.Driver{
Name: service.Logging.Driver,
Options: service.Logging.Options,
}
}
serviceSpec := swarm.ServiceSpec{
Annotations: swarm.Annotations{
Name: name,
Labels: AddStackLabel(namespace, service.Deploy.Labels),
},
TaskTemplate: swarm.TaskSpec{
ContainerSpec: &swarm.ContainerSpec{
Image: service.Image,
Command: service.Entrypoint,
Args: service.Command,
Hostname: service.Hostname,
Preserve sort-order of extra hosts, and allow duplicate entries Extra hosts (`extra_hosts` in compose-file, or `--hosts` in services) adds custom host/ip mappings to the container's `/etc/hosts`. The current implementation used a `map[string]string{}` as intermediate storage, and sorted the results alphabetically when converting to a service-spec. As a result, duplicate hosts were removed, and order of host/ip mappings was not preserved (in case the compose-file used a list instead of a map). According to the **host.conf(5)** man page (http://man7.org/linux/man-pages/man5/host.conf.5.html) multi Valid values are on and off. If set to on, the resolver library will return all valid addresses for a host that appears in the /etc/hosts file, instead of only the first. This is off by default, as it may cause a substantial performance loss at sites with large hosts files. Multiple entries for a host are allowed, and even required for some situations, for example, to add mappings for IPv4 and IPv6 addreses for a host, as illustrated by the example hosts file in the **hosts(5)** man page (http://man7.org/linux/man-pages/man5/hosts.5.html): # The following lines are desirable for IPv4 capable hosts 127.0.0.1 localhost # 127.0.1.1 is often used for the FQDN of the machine 127.0.1.1 thishost.mydomain.org thishost 192.168.1.10 foo.mydomain.org foo 192.168.1.13 bar.mydomain.org bar 146.82.138.7 master.debian.org master 209.237.226.90 www.opensource.org # The following lines are desirable for IPv6 capable hosts ::1 localhost ip6-localhost ip6-loopback ff02::1 ip6-allnodes ff02::2 ip6-allrouters This patch changes the intermediate storage format to use a `[]string`, and only sorts entries if the input format in the compose file is a mapping. If the input format is a list, the original sort-order is preserved. Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
2017-10-29 20:33:23 -04:00
Hosts: convertExtraHosts(service.ExtraHosts),
DNSConfig: dnsConfig,
Healthcheck: healthcheck,
Env: sortStrings(convertEnvironment(service.Environment)),
Labels: AddStackLabel(namespace, service.Labels),
Dir: service.WorkingDir,
User: service.User,
Mounts: mounts,
StopGracePeriod: service.StopGracePeriod,
StopSignal: service.StopSignal,
TTY: service.Tty,
OpenStdin: service.StdinOpen,
Secrets: secrets,
Configs: configs,
ReadOnly: service.ReadOnly,
Privileges: &privileges,
Isolation: container.Isolation(service.Isolation),
},
LogDriver: logDriver,
Resources: resources,
RestartPolicy: restartPolicy,
Placement: &swarm.Placement{
Constraints: service.Deploy.Placement.Constraints,
Preferences: getPlacementPreference(service.Deploy.Placement.Preferences),
},
},
EndpointSpec: endpoint,
Mode: mode,
UpdateConfig: convertUpdateConfig(service.Deploy.UpdateConfig),
}
// add an image label to serviceSpec
serviceSpec.Labels[LabelImage] = service.Image
// ServiceSpec.Networks is deprecated and should not have been used by
// this package. It is possible to update TaskTemplate.Networks, but it
// is not possible to update ServiceSpec.Networks. Unfortunately, we
// can't unconditionally start using TaskTemplate.Networks, because that
// will break with older daemons that don't support migrating from
// ServiceSpec.Networks to TaskTemplate.Networks. So which field to use
// is conditional on daemon version.
if versions.LessThan(apiVersion, "1.29") {
serviceSpec.Networks = networks
} else {
serviceSpec.TaskTemplate.Networks = networks
}
return serviceSpec, nil
}
func getPlacementPreference(preferences []composetypes.PlacementPreferences) []swarm.PlacementPreference {
result := []swarm.PlacementPreference{}
for _, preference := range preferences {
spreadDescriptor := preference.Spread
result = append(result, swarm.PlacementPreference{
Spread: &swarm.SpreadOver{
SpreadDescriptor: spreadDescriptor,
},
})
}
return result
}
func sortStrings(strs []string) []string {
sort.Strings(strs)
return strs
}
type byNetworkTarget []swarm.NetworkAttachmentConfig
func (a byNetworkTarget) Len() int { return len(a) }
func (a byNetworkTarget) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
func (a byNetworkTarget) Less(i, j int) bool { return a[i].Target < a[j].Target }
func convertServiceNetworks(
networks map[string]*composetypes.ServiceNetworkConfig,
networkConfigs networkMap,
namespace Namespace,
name string,
) ([]swarm.NetworkAttachmentConfig, error) {
if len(networks) == 0 {
networks = map[string]*composetypes.ServiceNetworkConfig{
defaultNetwork: {},
}
}
nets := []swarm.NetworkAttachmentConfig{}
for networkName, network := range networks {
networkConfig, ok := networkConfigs[networkName]
if !ok && networkName != defaultNetwork {
return nil, errors.Errorf("undefined network %q", networkName)
}
var aliases []string
if network != nil {
aliases = network.Aliases
}
target := namespace.Scope(networkName)
if networkConfig.Name != "" {
target = networkConfig.Name
}
netAttachConfig := swarm.NetworkAttachmentConfig{
Target: target,
Aliases: aliases,
}
// Only add default aliases to user defined networks. Other networks do
// not support aliases.
if container.NetworkMode(target).IsUserDefined() {
netAttachConfig.Aliases = append(netAttachConfig.Aliases, name)
}
nets = append(nets, netAttachConfig)
}
sort.Sort(byNetworkTarget(nets))
return nets, nil
}
// TODO: fix secrets API so that SecretAPIClient is not required here
func convertServiceSecrets(
client client.SecretAPIClient,
namespace Namespace,
secrets []composetypes.ServiceSecretConfig,
secretSpecs map[string]composetypes.SecretConfig,
) ([]*swarm.SecretReference, error) {
refs := []*swarm.SecretReference{}
lookup := func(key string) (composetypes.FileObjectConfig, error) {
secretSpec, exists := secretSpecs[key]
if !exists {
return composetypes.FileObjectConfig{}, errors.Errorf("undefined secret %q", key)
}
return composetypes.FileObjectConfig(secretSpec), nil
}
for _, secret := range secrets {
obj, err := convertFileObject(namespace, composetypes.FileReferenceConfig(secret), lookup)
if err != nil {
return nil, err
}
file := swarm.SecretReferenceFileTarget(obj.File)
refs = append(refs, &swarm.SecretReference{
File: &file,
SecretName: obj.Name,
})
}
secrs, err := servicecli.ParseSecrets(client, refs)
if err != nil {
return nil, err
}
// sort to ensure idempotence (don't restart services just because the entries are in different order)
sort.SliceStable(secrs, func(i, j int) bool { return secrs[i].SecretName < secrs[j].SecretName })
return secrs, err
}
// TODO: fix configs API so that ConfigsAPIClient is not required here
func convertServiceConfigObjs(
client client.ConfigAPIClient,
namespace Namespace,
configs []composetypes.ServiceConfigObjConfig,
configSpecs map[string]composetypes.ConfigObjConfig,
) ([]*swarm.ConfigReference, error) {
refs := []*swarm.ConfigReference{}
lookup := func(key string) (composetypes.FileObjectConfig, error) {
configSpec, exists := configSpecs[key]
if !exists {
return composetypes.FileObjectConfig{}, errors.Errorf("undefined config %q", key)
}
return composetypes.FileObjectConfig(configSpec), nil
}
for _, config := range configs {
obj, err := convertFileObject(namespace, composetypes.FileReferenceConfig(config), lookup)
if err != nil {
return nil, err
}
file := swarm.ConfigReferenceFileTarget(obj.File)
refs = append(refs, &swarm.ConfigReference{
File: &file,
ConfigName: obj.Name,
})
}
confs, err := servicecli.ParseConfigs(client, refs)
if err != nil {
return nil, err
}
// sort to ensure idempotence (don't restart services just because the entries are in different order)
sort.SliceStable(confs, func(i, j int) bool { return confs[i].ConfigName < confs[j].ConfigName })
return confs, err
}
type swarmReferenceTarget struct {
Name string
UID string
GID string
Mode os.FileMode
}
type swarmReferenceObject struct {
File swarmReferenceTarget
ID string
Name string
}
func convertFileObject(
namespace Namespace,
config composetypes.FileReferenceConfig,
lookup func(key string) (composetypes.FileObjectConfig, error),
) (swarmReferenceObject, error) {
target := config.Target
if target == "" {
target = config.Source
}
obj, err := lookup(config.Source)
if err != nil {
return swarmReferenceObject{}, err
}
source := namespace.Scope(config.Source)
if obj.Name != "" {
source = obj.Name
}
uid := config.UID
gid := config.GID
if uid == "" {
uid = "0"
}
if gid == "" {
gid = "0"
}
mode := config.Mode
if mode == nil {
mode = uint32Ptr(0444)
}
return swarmReferenceObject{
File: swarmReferenceTarget{
Name: target,
UID: uid,
GID: gid,
Mode: os.FileMode(*mode),
},
Name: source,
}, nil
}
func uint32Ptr(value uint32) *uint32 {
return &value
}
Preserve sort-order of extra hosts, and allow duplicate entries Extra hosts (`extra_hosts` in compose-file, or `--hosts` in services) adds custom host/ip mappings to the container's `/etc/hosts`. The current implementation used a `map[string]string{}` as intermediate storage, and sorted the results alphabetically when converting to a service-spec. As a result, duplicate hosts were removed, and order of host/ip mappings was not preserved (in case the compose-file used a list instead of a map). According to the **host.conf(5)** man page (http://man7.org/linux/man-pages/man5/host.conf.5.html) multi Valid values are on and off. If set to on, the resolver library will return all valid addresses for a host that appears in the /etc/hosts file, instead of only the first. This is off by default, as it may cause a substantial performance loss at sites with large hosts files. Multiple entries for a host are allowed, and even required for some situations, for example, to add mappings for IPv4 and IPv6 addreses for a host, as illustrated by the example hosts file in the **hosts(5)** man page (http://man7.org/linux/man-pages/man5/hosts.5.html): # The following lines are desirable for IPv4 capable hosts 127.0.0.1 localhost # 127.0.1.1 is often used for the FQDN of the machine 127.0.1.1 thishost.mydomain.org thishost 192.168.1.10 foo.mydomain.org foo 192.168.1.13 bar.mydomain.org bar 146.82.138.7 master.debian.org master 209.237.226.90 www.opensource.org # The following lines are desirable for IPv6 capable hosts ::1 localhost ip6-localhost ip6-loopback ff02::1 ip6-allnodes ff02::2 ip6-allrouters This patch changes the intermediate storage format to use a `[]string`, and only sorts entries if the input format in the compose file is a mapping. If the input format is a list, the original sort-order is preserved. Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
2017-10-29 20:33:23 -04:00
// convertExtraHosts converts <host>:<ip> mappings to SwarmKit notation:
// "IP-address hostname(s)". The original order of mappings is preserved.
func convertExtraHosts(extraHosts composetypes.HostsList) []string {
hosts := []string{}
Preserve sort-order of extra hosts, and allow duplicate entries Extra hosts (`extra_hosts` in compose-file, or `--hosts` in services) adds custom host/ip mappings to the container's `/etc/hosts`. The current implementation used a `map[string]string{}` as intermediate storage, and sorted the results alphabetically when converting to a service-spec. As a result, duplicate hosts were removed, and order of host/ip mappings was not preserved (in case the compose-file used a list instead of a map). According to the **host.conf(5)** man page (http://man7.org/linux/man-pages/man5/host.conf.5.html) multi Valid values are on and off. If set to on, the resolver library will return all valid addresses for a host that appears in the /etc/hosts file, instead of only the first. This is off by default, as it may cause a substantial performance loss at sites with large hosts files. Multiple entries for a host are allowed, and even required for some situations, for example, to add mappings for IPv4 and IPv6 addreses for a host, as illustrated by the example hosts file in the **hosts(5)** man page (http://man7.org/linux/man-pages/man5/hosts.5.html): # The following lines are desirable for IPv4 capable hosts 127.0.0.1 localhost # 127.0.1.1 is often used for the FQDN of the machine 127.0.1.1 thishost.mydomain.org thishost 192.168.1.10 foo.mydomain.org foo 192.168.1.13 bar.mydomain.org bar 146.82.138.7 master.debian.org master 209.237.226.90 www.opensource.org # The following lines are desirable for IPv6 capable hosts ::1 localhost ip6-localhost ip6-loopback ff02::1 ip6-allnodes ff02::2 ip6-allrouters This patch changes the intermediate storage format to use a `[]string`, and only sorts entries if the input format in the compose file is a mapping. If the input format is a list, the original sort-order is preserved. Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
2017-10-29 20:33:23 -04:00
for _, hostIP := range extraHosts {
if v := strings.SplitN(hostIP, ":", 2); len(v) == 2 {
// Convert to SwarmKit notation: IP-address hostname(s)
hosts = append(hosts, fmt.Sprintf("%s %s", v[1], v[0]))
}
}
return hosts
}
func convertHealthcheck(healthcheck *composetypes.HealthCheckConfig) (*container.HealthConfig, error) {
if healthcheck == nil {
return nil, nil
}
var (
timeout, interval, startPeriod time.Duration
retries int
)
if healthcheck.Disable {
if len(healthcheck.Test) != 0 {
return nil, errors.Errorf("test and disable can't be set at the same time")
}
return &container.HealthConfig{
Test: []string{"NONE"},
}, nil
}
if healthcheck.Timeout != nil {
timeout = *healthcheck.Timeout
}
if healthcheck.Interval != nil {
interval = *healthcheck.Interval
}
if healthcheck.StartPeriod != nil {
startPeriod = *healthcheck.StartPeriod
}
if healthcheck.Retries != nil {
retries = int(*healthcheck.Retries)
}
return &container.HealthConfig{
Test: healthcheck.Test,
Timeout: timeout,
Interval: interval,
Retries: retries,
StartPeriod: startPeriod,
}, nil
}
func convertRestartPolicy(restart string, source *composetypes.RestartPolicy) (*swarm.RestartPolicy, error) {
// TODO: log if restart is being ignored
if source == nil {
policy, err := opts.ParseRestartPolicy(restart)
if err != nil {
return nil, err
}
switch {
case policy.IsNone():
return nil, nil
case policy.IsAlways(), policy.IsUnlessStopped():
return &swarm.RestartPolicy{
Condition: swarm.RestartPolicyConditionAny,
}, nil
case policy.IsOnFailure():
attempts := uint64(policy.MaximumRetryCount)
return &swarm.RestartPolicy{
Condition: swarm.RestartPolicyConditionOnFailure,
MaxAttempts: &attempts,
}, nil
default:
return nil, errors.Errorf("unknown restart policy: %s", restart)
}
}
return &swarm.RestartPolicy{
Condition: swarm.RestartPolicyCondition(source.Condition),
Delay: source.Delay,
MaxAttempts: source.MaxAttempts,
Window: source.Window,
}, nil
}
func convertUpdateConfig(source *composetypes.UpdateConfig) *swarm.UpdateConfig {
if source == nil {
return nil
}
parallel := uint64(1)
if source.Parallelism != nil {
parallel = *source.Parallelism
}
return &swarm.UpdateConfig{
Parallelism: parallel,
Delay: source.Delay,
FailureAction: source.FailureAction,
Monitor: source.Monitor,
MaxFailureRatio: source.MaxFailureRatio,
Order: source.Order,
}
}
func convertResources(source composetypes.Resources) (*swarm.ResourceRequirements, error) {
resources := &swarm.ResourceRequirements{}
var err error
if source.Limits != nil {
var cpus int64
if source.Limits.NanoCPUs != "" {
cpus, err = opts.ParseCPUs(source.Limits.NanoCPUs)
if err != nil {
return nil, err
}
}
resources.Limits = &swarm.Resources{
NanoCPUs: cpus,
MemoryBytes: int64(source.Limits.MemoryBytes),
}
}
if source.Reservations != nil {
var cpus int64
if source.Reservations.NanoCPUs != "" {
cpus, err = opts.ParseCPUs(source.Reservations.NanoCPUs)
if err != nil {
return nil, err
}
}
var generic []swarm.GenericResource
for _, res := range source.Reservations.GenericResources {
var r swarm.GenericResource
if res.DiscreteResourceSpec != nil {
r.DiscreteResourceSpec = &swarm.DiscreteGenericResource{
Kind: res.DiscreteResourceSpec.Kind,
Value: res.DiscreteResourceSpec.Value,
}
}
generic = append(generic, r)
}
resources.Reservations = &swarm.Resources{
NanoCPUs: cpus,
MemoryBytes: int64(source.Reservations.MemoryBytes),
GenericResources: generic,
}
}
return resources, nil
}
type byPublishedPort []swarm.PortConfig
func (a byPublishedPort) Len() int { return len(a) }
func (a byPublishedPort) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
func (a byPublishedPort) Less(i, j int) bool { return a[i].PublishedPort < a[j].PublishedPort }
func convertEndpointSpec(endpointMode string, source []composetypes.ServicePortConfig) (*swarm.EndpointSpec, error) {
portConfigs := []swarm.PortConfig{}
for _, port := range source {
portConfig := swarm.PortConfig{
Protocol: swarm.PortConfigProtocol(port.Protocol),
TargetPort: port.Target,
PublishedPort: port.Published,
PublishMode: swarm.PortConfigPublishMode(port.Mode),
}
portConfigs = append(portConfigs, portConfig)
}
sort.Sort(byPublishedPort(portConfigs))
return &swarm.EndpointSpec{
Mode: swarm.ResolutionMode(strings.ToLower(endpointMode)),
Ports: portConfigs,
}, nil
}
func convertEnvironment(source map[string]*string) []string {
var output []string
for name, value := range source {
switch value {
case nil:
output = append(output, name)
default:
output = append(output, fmt.Sprintf("%s=%s", name, *value))
}
}
return output
}
func convertDeployMode(mode string, replicas *uint64) (swarm.ServiceMode, error) {
serviceMode := swarm.ServiceMode{}
switch mode {
case "global":
if replicas != nil {
return serviceMode, errors.Errorf("replicas can only be used with replicated mode")
}
serviceMode.Global = &swarm.GlobalService{}
case "replicated", "":
serviceMode.Replicated = &swarm.ReplicatedService{Replicas: replicas}
default:
return serviceMode, errors.Errorf("Unknown mode: %s", mode)
}
return serviceMode, nil
}
func convertDNSConfig(DNS []string, DNSSearch []string) (*swarm.DNSConfig, error) {
if DNS != nil || DNSSearch != nil {
return &swarm.DNSConfig{
Nameservers: DNS,
Search: DNSSearch,
}, nil
}
return nil, nil
}
func convertCredentialSpec(spec composetypes.CredentialSpecConfig) (*swarm.CredentialSpec, error) {
if spec.File == "" && spec.Registry == "" {
return nil, nil
}
if spec.File != "" && spec.Registry != "" {
return nil, errors.New("Invalid credential spec - must provide one of `File` or `Registry`")
}
swarmCredSpec := swarm.CredentialSpec(spec)
return &swarmCredSpec, nil
}