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automated.go
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automated.go
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package update
import (
"bytes"
"fmt"
"github.com/go-kit/kit/log"
"github.com/weaveworks/flux"
"github.com/weaveworks/flux/image"
"github.com/weaveworks/flux/resource"
)
type Automated struct {
Changes []Change
}
type Change struct {
ServiceID flux.ResourceID
Container resource.Container
ImageID image.Ref
}
func (a *Automated) Add(service flux.ResourceID, container resource.Container, image image.Ref) {
a.Changes = append(a.Changes, Change{service, container, image})
}
func (a *Automated) CalculateRelease(rc ReleaseContext, logger log.Logger) ([]*ControllerUpdate, Result, error) {
prefilters := []ControllerFilter{
&IncludeFilter{a.serviceIDs()},
}
result := Result{}
updates, err := rc.SelectServices(result, prefilters, nil)
if err != nil {
return nil, nil, err
}
a.markSkipped(result)
updates, err = a.calculateImageUpdates(rc, updates, result, logger)
if err != nil {
return nil, nil, err
}
return updates, result, err
}
func (a *Automated) ReleaseType() ReleaseType {
return "automated"
}
func (a *Automated) ReleaseKind() ReleaseKind {
return ReleaseKindExecute
}
func (a *Automated) CommitMessage(result Result) string {
images := result.ChangedImages()
buf := &bytes.Buffer{}
prefix := ""
switch len(images) {
case 0: // FIXME(michael): can we get here?
fmt.Fprintln(buf, "Auto-release (no images)")
case 1:
fmt.Fprint(buf, "Auto-release ")
default:
fmt.Fprintln(buf, "Auto-release multiple images")
fmt.Fprintln(buf)
prefix = " - "
}
for _, im := range images {
fmt.Fprintf(buf, "%s%s\n", prefix, im)
}
return buf.String()
}
func (a *Automated) markSkipped(results Result) {
for _, v := range a.serviceIDs() {
if _, ok := results[v]; !ok {
results[v] = ControllerResult{
Status: ReleaseStatusSkipped,
Error: NotInRepo,
}
}
}
}
func (a *Automated) calculateImageUpdates(rc ReleaseContext, candidates []*ControllerUpdate, result Result, logger log.Logger) ([]*ControllerUpdate, error) {
updates := []*ControllerUpdate{}
serviceMap := a.serviceMap()
for _, u := range candidates {
containers := u.Resource.Containers()
changes := serviceMap[u.ResourceID]
containerUpdates := []ContainerUpdate{}
for _, container := range containers {
currentImageID := container.Image
for _, change := range changes {
if change.Container.Name != container.Name {
continue
}
// It turns out this isn't a change after all; skip this container
if change.ImageID.CanonicalRef() == container.Image.CanonicalRef() {
continue
}
// We transplant the tag here, to make sure we keep
// the format of the image name as it is in the
// resource (e.g., to avoid canonicalising it)
newImageID := currentImageID.WithNewTag(change.ImageID.Tag)
containerUpdates = append(containerUpdates, ContainerUpdate{
Container: container.Name,
Current: currentImageID,
Target: newImageID,
})
}
}
if len(containerUpdates) > 0 {
u.Updates = containerUpdates
updates = append(updates, u)
result[u.ResourceID] = ControllerResult{
Status: ReleaseStatusSuccess,
PerContainer: containerUpdates,
}
} else {
result[u.ResourceID] = ControllerResult{
Status: ReleaseStatusSkipped,
Error: ImageUpToDate,
}
}
}
return updates, nil
}
// serviceMap transposes the changes so they can be looked up by ID
func (a *Automated) serviceMap() map[flux.ResourceID][]Change {
set := map[flux.ResourceID][]Change{}
for _, change := range a.Changes {
set[change.ServiceID] = append(set[change.ServiceID], change)
}
return set
}
func (a *Automated) serviceIDs() []flux.ResourceID {
slice := []flux.ResourceID{}
for service, _ := range a.serviceMap() {
slice = append(slice, flux.MustParseResourceID(service.String()))
}
return slice
}