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context.go
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context.go
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// SPDX-FileCopyrightText: 2022 SAP SE or an SAP affiliate company and Open Component Model contributors.
//
// SPDX-License-Identifier: Apache-2.0
package internal
import (
"context"
"io"
"reflect"
"github.com/mandelsoft/vfs/pkg/vfs"
"github.com/open-component-model/ocm/pkg/common/accessio"
"github.com/open-component-model/ocm/pkg/common/accessobj"
"github.com/open-component-model/ocm/pkg/contexts/config"
cfgcpi "github.com/open-component-model/ocm/pkg/contexts/config/cpi"
"github.com/open-component-model/ocm/pkg/contexts/credentials"
"github.com/open-component-model/ocm/pkg/contexts/datacontext"
"github.com/open-component-model/ocm/pkg/contexts/datacontext/attrs/vfsattr"
"github.com/open-component-model/ocm/pkg/contexts/oci"
ctfoci "github.com/open-component-model/ocm/pkg/contexts/oci/repositories/ctf"
"github.com/open-component-model/ocm/pkg/contexts/ocm"
ctfocm "github.com/open-component-model/ocm/pkg/contexts/ocm/repositories/ctf"
"github.com/open-component-model/ocm/pkg/errors"
"github.com/open-component-model/ocm/pkg/out"
)
const CONTEXT_TYPE = "ocm.cmd" + datacontext.OCM_CONTEXT_SUFFIX
type OCI interface {
Context() oci.Context
OpenCTF(path string) (oci.Repository, error)
}
type OCM interface {
Context() ocm.Context
OpenCTF(path string) (ocm.Repository, error)
}
type FileSystem struct {
vfs.FileSystem
}
func (f *FileSystem) ApplyOption(options accessio.Options) error {
options.SetPathFileSystem(f.FileSystem)
return nil
}
type Context interface {
datacontext.Context
AttributesContext() datacontext.AttributesContext
ConfigContext() config.Context
CredentialsContext() credentials.Context
OCIContext() oci.Context
OCMContext() ocm.Context
FileSystem() *FileSystem
OCI() OCI
OCM() OCM
ApplyOption(options accessio.Options) error
out.Context
WithStdIO(r io.Reader, o io.Writer, e io.Writer) Context
}
var key = reflect.TypeOf(_context{})
// DefaultContext is the default context initialized by init functions.
var DefaultContext = Builder{}.New(datacontext.MODE_SHARED)
// ForContext returns the Context to use for context.Context.
// This is either an explicit context or the default context.
// The returned context incorporates the given context.
func ForContext(ctx context.Context) Context {
c, _ := datacontext.ForContextByKey(ctx, key, DefaultContext)
return c.(Context)
}
func DefinedForContext(ctx context.Context) (Context, bool) {
c, ok := datacontext.ForContextByKey(ctx, key, DefaultContext)
if c != nil {
return c.(Context), ok
}
return nil, ok
}
////////////////////////////////////////////////////////////////////////////////
type _context struct {
datacontext.Context
updater cfgcpi.Updater
sharedAttributes datacontext.AttributesContext
config config.Context
credentials credentials.Context
oci *_oci
ocm *_ocm
out out.Context
}
var _ Context = &_context{}
func newContext(shared datacontext.AttributesContext, ocmctx ocm.Context, outctx out.Context, fs vfs.FileSystem, delegates datacontext.Delegates) Context {
if outctx == nil {
outctx = out.New()
}
if shared == nil {
shared = ocmctx.AttributesContext()
}
c := &_context{
sharedAttributes: shared,
credentials: ocmctx.CredentialsContext(),
config: ocmctx.CredentialsContext().ConfigContext(),
out: outctx,
}
c.Context = datacontext.NewContextBase(c, CONTEXT_TYPE, key, ocmctx.GetAttributes(), delegates)
c.updater = cfgcpi.NewUpdater(ocmctx.CredentialsContext().ConfigContext(), c)
c.oci = newOCI(c, ocmctx)
c.ocm = newOCM(c, ocmctx)
if fs != nil {
vfsattr.Set(c.AttributesContext(), fs)
}
return c
}
func (c *_context) Update() error {
return c.updater.Update()
}
func (c *_context) AttributesContext() datacontext.AttributesContext {
return c.sharedAttributes
}
func (c *_context) ConfigContext() config.Context {
return c.config
}
func (c *_context) CredentialsContext() credentials.Context {
return c.credentials
}
func (c *_context) OCIContext() oci.Context {
return c.oci.Context()
}
func (c *_context) OCMContext() ocm.Context {
return c.ocm.Context()
}
func (c *_context) FileSystem() *FileSystem {
return &FileSystem{vfsattr.Get(c)}
}
func (c *_context) OCI() OCI {
return c.oci
}
func (c *_context) OCM() OCM {
return c.ocm
}
func (c *_context) ApplyOption(options accessio.Options) error {
options.SetPathFileSystem(c.FileSystem())
return nil
}
func (c *_context) StdOut() io.Writer {
return c.out.StdOut()
}
func (c *_context) StdErr() io.Writer {
return c.out.StdErr()
}
func (c *_context) StdIn() io.Reader {
return c.out.StdIn()
}
func (c *_context) WithStdIO(r io.Reader, o io.Writer, e io.Writer) Context {
return &_view{
Context: c,
out: out.NewFor(out.WithStdIO(c.out, r, o, e)),
}
}
////////////////////////////////////////////////////////////////////////////////
type _view struct {
Context
out out.Context
}
func (c *_view) StdOut() io.Writer {
return c.out.StdOut()
}
func (c *_view) StdErr() io.Writer {
return c.out.StdErr()
}
func (c *_view) StdIn() io.Reader {
return c.out.StdIn()
}
func (c *_view) WithStdIO(r io.Reader, o io.Writer, e io.Writer) Context {
return &_view{
Context: c.Context,
out: out.NewFor(out.WithStdIO(c.out, r, o, e)),
}
}
////////////////////////////////////////////////////////////////////////////////
// the coding for _oci and _ocm is identical except the package used:
// _oci uses oci and ctfoci
// _ocm uses ocm and ctfocm
type _oci struct {
*_context
ctx oci.Context
repos map[string]oci.RepositorySpec
}
func newOCI(ctx *_context, ocmctx ocm.Context) *_oci {
return &_oci{
_context: ctx,
ctx: ocmctx.OCIContext(),
repos: map[string]oci.RepositorySpec{},
}
}
func (c *_oci) Context() oci.Context {
return c.ctx
}
func (c *_oci) OpenCTF(path string) (oci.Repository, error) {
ok, err := vfs.Exists(c.FileSystem(), path)
if err != nil {
return nil, err
}
if !ok {
return nil, errors.ErrNotFound("file", path)
}
return ctfoci.Open(c.ctx, accessobj.ACC_WRITABLE, path, 0, accessio.PathFileSystem(c.FileSystem()))
}
////////////////////////////////////////////////////////////////////////////////
type _ocm struct {
*_context
ctx ocm.Context
repos map[string]ocm.RepositorySpec
}
func newOCM(ctx *_context, ocmctx ocm.Context) *_ocm {
return &_ocm{
_context: ctx,
ctx: ocmctx,
repos: map[string]ocm.RepositorySpec{},
}
}
func (c *_ocm) Context() ocm.Context {
return c.ctx
}
func (c *_ocm) OpenCTF(path string) (ocm.Repository, error) {
ok, err := vfs.Exists(c.FileSystem(), path)
if err != nil {
return nil, err
}
if !ok {
return nil, errors.ErrNotFound("file", path)
}
return ctfocm.Open(c.ctx, accessobj.ACC_WRITABLE, path, 0, c)
}