/
charmhub.go
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/
charmhub.go
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// Copyright 2020 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package resource
import (
"context"
"net/url"
charmresource "github.com/juju/charm/v12/resource"
"github.com/juju/errors"
"github.com/kr/pretty"
"github.com/juju/juju/charmhub"
"github.com/juju/juju/charmhub/transport"
corelogger "github.com/juju/juju/core/logger"
"github.com/juju/juju/state"
)
type charmHubOpener struct {
st chClientState
}
func newCharmHubOpener(st chClientState) *charmHubOpener {
return &charmHubOpener{st}
}
func (ch *charmHubOpener) NewClient() (*ResourceRetryClient, error) {
client, err := newCharmHubClient(ch.st)
if err != nil {
return nil, errors.Trace(err)
}
return newRetryClient(client), nil
}
// chClientState represents a state which can provide a model to create a
// CharmHub client.
type chClientState interface {
Model() (*state.Model, error)
}
func newCharmHubClient(st chClientState) (ResourceGetter, error) {
m, err := st.Model()
if err != nil {
return &CharmHubClient{}, errors.Trace(err)
}
modelCfg, err := m.Config()
if err != nil {
return &CharmHubClient{}, errors.Trace(err)
}
chURL, _ := modelCfg.CharmHubURL()
chClient, err := charmhub.NewClient(charmhub.Config{
URL: chURL,
Logger: logger,
})
if err != nil {
return nil, errors.Trace(err)
}
return &CharmHubClient{client: chClient, logger: logger.ChildWithLabels("charmhub", corelogger.CHARMHUB)}, nil
}
type CharmHubClient struct {
client CharmHub
logger Logger
}
// GetResource returns data about the resource including an io.ReadCloser
// to download the resource. The caller is responsible for closing it.
func (ch *CharmHubClient) GetResource(req ResourceRequest) (ResourceData, error) {
ch.logger.Tracef("GetResource(%s)", pretty.Sprint(req))
var data ResourceData
// GetResource is called after a charm is installed, therefore the
// origin must have an ID. Error if not.
origin := req.CharmID.Origin
if origin.Revision == nil {
return data, errors.BadRequestf("empty charm origin revision")
}
// The charm revision isn't really required here, just handy for
// getting the correct resource revision. Using a channel would
// limit resource revisions found. The resource revision is set
// during deploy when a resolving resources for add pending resources.
// This also closes a timing window where a charm and resource
// is updated in the channel in between deploy and resource use.
cfg, err := charmhub.DownloadOneFromRevision(origin.ID, *origin.Revision)
if err != nil {
return data, errors.Trace(err)
}
if newCfg, ok := charmhub.AddResource(cfg, req.Name, req.Revision); ok {
cfg = newCfg
}
refreshResp, err := ch.client.Refresh(context.TODO(), cfg)
if err != nil {
return data, errors.Trace(err)
}
if len(refreshResp) == 0 {
return data, errors.Errorf("no download refresh responses received")
}
resp := refreshResp[0]
r, resourceURL, err := resourceFromRevision(req.Name, resp.Entity.Resources)
if err != nil {
return data, errors.Trace(err)
}
data.Resource = r
ch.logger.Tracef("Read resource %q from %q", r.Name, resourceURL)
data.ReadCloser, err = ch.client.DownloadResource(context.TODO(), resourceURL)
if err != nil {
return data, errors.Trace(err)
}
return data, nil
}
func resourceFromRevision(name string, revs []transport.ResourceRevision) (charmresource.Resource, *url.URL, error) {
var rev transport.ResourceRevision
for _, v := range revs {
if v.Name == name {
rev = v
}
}
if rev.Name != name {
return charmresource.Resource{}, nil, errors.Trace(errors.NotFoundf("resource %q", name))
}
resType, err := charmresource.ParseType(rev.Type)
if err != nil {
return charmresource.Resource{}, nil, errors.Trace(err)
}
fingerprint, err := charmresource.ParseFingerprint(rev.Download.HashSHA384)
if err != nil {
return charmresource.Resource{}, nil, errors.Trace(err)
}
r := charmresource.Resource{
Fingerprint: fingerprint,
Meta: charmresource.Meta{
Name: rev.Name,
Type: resType,
Path: rev.Filename,
Description: rev.Description,
},
Origin: charmresource.OriginStore,
Revision: rev.Revision,
Size: int64(rev.Download.Size),
}
resourceURL, err := url.Parse(rev.Download.URL)
if err != nil {
return charmresource.Resource{}, nil, errors.Trace(err)
}
return r, resourceURL, nil
}