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session.go
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session.go
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package ocm
import (
"fmt"
"reflect"
"github.com/mandelsoft/goutils/errors"
"github.com/open-component-model/ocm/pkg/common"
"github.com/open-component-model/ocm/pkg/contexts/datacontext"
"github.com/open-component-model/ocm/pkg/contexts/ocm/internal"
)
type ComponentContainer interface {
LookupComponent(name string) (ComponentAccess, error)
}
type ComponentVersionContainer interface {
LookupVersion(version string) (ComponentVersionAccess, error)
}
type EvaluationResult struct {
Ref RefSpec
Repository Repository
Component ComponentAccess
Version ComponentVersionAccess
}
type Session interface {
datacontext.Session
Finalize(Finalizer)
LookupRepository(Context, RepositorySpec) (Repository, error)
LookupComponent(ComponentContainer, string) (ComponentAccess, error)
LookupComponentVersion(r ComponentVersionResolver, comp, vers string) (ComponentVersionAccess, error)
GetComponentVersion(ComponentVersionContainer, string) (ComponentVersionAccess, error)
EvaluateRef(ctx Context, ref string) (*EvaluationResult, error)
EvaluateComponentRef(ctx Context, ref string) (*EvaluationResult, error)
EvaluateVersionRef(ctx Context, ref string) (*EvaluationResult, error)
DetermineRepository(ctx Context, ref string) (Repository, UniformRepositorySpec, error)
DetermineRepositoryBySpec(ctx Context, spec *UniformRepositorySpec) (Repository, error)
}
type session struct {
datacontext.Session
base datacontext.SessionBase
repositories *internal.RepositoryCache
components map[datacontext.ObjectKey]ComponentAccess
versions map[datacontext.ObjectKey]ComponentVersionAccess
}
var _ Session = (*session)(nil)
var key = reflect.TypeOf(session{})
func NewSession(s datacontext.Session) Session {
return datacontext.GetOrCreateSubSession(s, key, newSession).(Session)
}
func newSession(s datacontext.SessionBase) datacontext.Session {
return &session{
Session: s.Session(),
base: s,
repositories: internal.NewRepositoryCache(),
components: map[datacontext.ObjectKey]ComponentAccess{},
versions: map[datacontext.ObjectKey]ComponentVersionAccess{},
}
}
type Finalizer interface {
Finalize() error
}
type finalizer struct {
finalizer Finalizer
}
func (f *finalizer) Close() error {
return f.finalizer.Finalize()
}
func (s *session) Finalize(f Finalizer) {
s.Session.AddCloser(&finalizer{f})
}
func (s *session) Close() error {
return s.Session.Close()
// TODO: cleanup cache
}
func (s *session) LookupRepository(ctx Context, spec RepositorySpec) (Repository, error) {
s.base.Lock()
defer s.base.Unlock()
if s.base.IsClosed() {
return nil, errors.ErrClosed("session")
}
repo, cached, err := s.repositories.LookupRepository(ctx, spec)
if err != nil {
return nil, err
}
// The repo's closer function should only be added once with add closer. Otherwise, it would be attempted to close
// an already closed object. Thus, we only want to add the repo's closer function, if it was not already cached
// (and thus, consequently already added to the sessions close).
// Session has to take over responsibility for open repositories for the Repository Cache because the objects
// opened during a session have to be closed in the reverse order they were opened (e.g. components opened based
// on a previously opened repository have to be closed first).
if !cached {
s.base.AddCloser(repo)
}
return repo, nil
}
func (s *session) LookupComponent(c ComponentContainer, name string) (ComponentAccess, error) {
key := datacontext.ObjectKey{
Object: c,
Name: name,
}
s.base.Lock()
defer s.base.Unlock()
if s.base.IsClosed() {
return nil, errors.ErrClosed("session")
}
if ns := s.components[key]; ns != nil {
return ns, nil
}
ns, err := c.LookupComponent(name)
if err != nil {
return nil, err
}
s.components[key] = ns
s.base.AddCloser(ns)
return ns, err
}
func (s *session) LookupComponentVersion(r ComponentVersionResolver, comp, vers string) (ComponentVersionAccess, error) {
if repo, ok := r.(Repository); ok {
component, err := s.LookupComponent(repo, comp)
if err != nil {
return nil, err
}
return s.GetComponentVersion(component, vers)
}
key := datacontext.ObjectKey{
Object: r,
Name: common.NewNameVersion(comp, vers).String(),
}
s.base.Lock()
defer s.base.Unlock()
if s.base.IsClosed() {
return nil, errors.ErrClosed("session")
}
if obj := s.versions[key]; obj != nil {
return obj, nil
}
obj, err := r.LookupComponentVersion(comp, vers)
if err != nil {
return nil, err
}
s.versions[key] = obj
s.base.AddCloser(obj)
return obj, err
}
func (s *session) GetComponentVersion(c ComponentVersionContainer, version string) (ComponentVersionAccess, error) {
if c == nil {
return nil, fmt.Errorf("no container given")
}
key := datacontext.ObjectKey{
Object: c,
Name: version,
}
s.base.Lock()
defer s.base.Unlock()
if s.base.IsClosed() {
return nil, errors.ErrClosed("session")
}
if obj := s.versions[key]; obj != nil {
return obj, nil
}
obj, err := c.LookupVersion(version)
if err != nil {
return nil, err
}
s.versions[key] = obj
s.base.AddCloser(obj)
return obj, err
}
func (s *session) EvaluateVersionRef(ctx Context, ref string) (*EvaluationResult, error) {
evaluated, err := s.EvaluateComponentRef(ctx, ref)
if err != nil {
return nil, err
}
versions, err := evaluated.Component.ListVersions()
if err != nil {
return evaluated, errors.Wrapf(err, "%s[%s]: listing versions", ref, evaluated.Ref.Component)
}
if len(versions) != 1 {
return evaluated, errors.Wrapf(err, "%s {%s]: found %d components", ref, evaluated.Ref.Component, len(versions))
}
evaluated.Version, err = s.GetComponentVersion(evaluated.Component, versions[0])
if err != nil {
return evaluated, errors.Wrapf(err, "%s {%s:%s]: listing components", ref, evaluated.Ref.Component, versions[0])
}
evaluated.Ref.Version = &versions[0]
return evaluated, nil
}
func (s *session) EvaluateComponentRef(ctx Context, ref string) (*EvaluationResult, error) {
evaluated, err := s.EvaluateRef(ctx, ref)
if err != nil {
return evaluated, err
}
if evaluated.Component == nil {
lister := evaluated.Repository.ComponentLister()
if lister == nil {
return evaluated, errors.Newf("%s: no component specified", ref)
}
if n, err := lister.NumComponents(""); n != 1 {
if err != nil {
return evaluated, errors.Wrapf(err, "%s: listing components", ref)
}
// return evaluated, errors.Newf("%s: found %d components", ref, n)
return evaluated, nil // return repo ref
}
list, err := lister.GetComponents("", true)
if err != nil {
return evaluated, errors.Wrapf(err, "%s: listing components", ref)
}
evaluated.Ref.Component = list[0]
evaluated.Component, err = s.LookupComponent(evaluated.Repository, list[0])
if err != nil {
return evaluated, errors.Wrapf(err, "%s: listing components", ref)
}
}
return evaluated, nil
}
func (s *session) EvaluateRef(ctx Context, ref string) (*EvaluationResult, error) {
var err error
result := &EvaluationResult{}
result.Ref, err = ParseRef(ref)
if err != nil {
return nil, err
}
result.Repository, err = s.DetermineRepositoryBySpec(ctx, &result.Ref.UniformRepositorySpec)
if err != nil {
return result, err
}
if result.Ref.Component != "" {
result.Component, err = s.LookupComponent(result.Repository, result.Ref.Component)
if err != nil {
return nil, err
}
if result.Ref.IsVersion() {
result.Version, err = s.GetComponentVersion(result.Component, *result.Ref.Version)
}
}
return result, err
}
func (s *session) DetermineRepository(ctx Context, ref string) (Repository, UniformRepositorySpec, error) {
spec, err := ParseRepo(ref)
if err != nil {
return nil, spec, err
}
r, err := s.DetermineRepositoryBySpec(ctx, &spec)
return r, spec, err
}
func (s *session) DetermineRepositoryBySpec(ctx Context, spec *UniformRepositorySpec) (Repository, error) {
rspec, err := ctx.MapUniformRepositorySpec(spec)
if err != nil {
return nil, err
}
return s.LookupRepository(ctx, rspec)
}