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opener_test.go
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/
opener_test.go
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// Copyright 2020 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package resource_test
import (
"bytes"
"io"
"sync"
"time"
"github.com/golang/mock/gomock"
"github.com/juju/charm/v10"
charmresource "github.com/juju/charm/v10/resource"
"github.com/juju/errors"
"github.com/juju/names/v4"
jc "github.com/juju/testing/checkers"
gc "gopkg.in/check.v1"
"github.com/juju/juju/core/resources"
"github.com/juju/juju/resource"
"github.com/juju/juju/resource/mocks"
"github.com/juju/juju/state"
coretesting "github.com/juju/juju/testing"
)
type OpenerSuite struct {
appName string
unitName string
charmURL *charm.URL
charmOrigin state.CharmOrigin
resources *mocks.MockResources
resourceGetter *mocks.MockResourceGetter
limiter *mocks.MockResourceDownloadLock
unleash sync.Mutex
}
var _ = gc.Suite(&OpenerSuite{})
func (s *OpenerSuite) TestOpenResource(c *gc.C) {
defer s.setupMocks(c, true).Finish()
fp, _ := charmresource.ParseFingerprint("38b060a751ac96384cd9327eb1b1e36a21fdb71114be07434c0cc7bf63f6e1da274edebfe76f65fbd51ad2f14898b95b")
res := resources.Resource{
Resource: charmresource.Resource{
Meta: charmresource.Meta{
Name: "wal-e",
Type: 1,
},
Origin: 2,
Revision: 0,
Fingerprint: fp,
Size: 0,
},
ApplicationID: "postgreql",
}
s.expectCacheMethods(res, 1)
s.resourceGetter.EXPECT().GetResource(gomock.Any()).Return(resource.ResourceData{
ReadCloser: nil,
Resource: res.Resource,
}, nil)
opened, err := s.newOpener(0).OpenResource("wal-e")
c.Assert(err, jc.ErrorIsNil)
c.Check(opened.Resource, gc.DeepEquals, res)
c.Assert(opened.Close(), jc.ErrorIsNil)
}
func (s *OpenerSuite) TestOpenResourceThrottle(c *gc.C) {
defer s.setupMocks(c, true).Finish()
fp, _ := charmresource.ParseFingerprint("38b060a751ac96384cd9327eb1b1e36a21fdb71114be07434c0cc7bf63f6e1da274edebfe76f65fbd51ad2f14898b95b")
res := resources.Resource{
Resource: charmresource.Resource{
Meta: charmresource.Meta{
Name: "wal-e",
Type: 1,
},
Origin: 2,
Revision: 0,
Fingerprint: fp,
Size: 0,
},
ApplicationID: "postgreql",
}
const (
numConcurrentRequests = 10
maxConcurrentRequests = 5
)
s.expectCacheMethods(res, numConcurrentRequests)
s.resourceGetter.EXPECT().GetResource(gomock.Any()).Return(resource.ResourceData{
ReadCloser: nil,
Resource: res.Resource,
}, nil)
s.unleash.Lock()
start := sync.WaitGroup{}
finished := sync.WaitGroup{}
for i := 0; i < numConcurrentRequests; i++ {
start.Add(1)
finished.Add(1)
go func() {
defer finished.Done()
start.Done()
opened, err := s.newOpener(maxConcurrentRequests).OpenResource("wal-e")
c.Assert(err, jc.ErrorIsNil)
c.Check(opened.Resource, gc.DeepEquals, res)
c.Assert(opened.Close(), jc.ErrorIsNil)
}()
}
// Let all the test routines queue up then unleash.
start.Wait()
s.unleash.Unlock()
done := make(chan bool)
go func() {
finished.Wait()
close(done)
}()
select {
case <-done:
case <-time.After(coretesting.LongWait):
c.Fatal("timeout waiting for resources to be fetched")
}
}
func (s *OpenerSuite) TestOpenResourceApplication(c *gc.C) {
defer s.setupMocks(c, false).Finish()
fp, _ := charmresource.ParseFingerprint("38b060a751ac96384cd9327eb1b1e36a21fdb71114be07434c0cc7bf63f6e1da274edebfe76f65fbd51ad2f14898b95b")
res := resources.Resource{
Resource: charmresource.Resource{
Meta: charmresource.Meta{
Name: "wal-e",
Type: 1,
},
Origin: 2,
Revision: 0,
Fingerprint: fp,
Size: 0,
},
ApplicationID: "postgreql",
}
s.expectCacheMethods(res, 1)
s.resourceGetter.EXPECT().GetResource(gomock.Any()).Return(resource.ResourceData{
ReadCloser: nil,
Resource: res.Resource,
}, nil)
opened, err := s.newOpener(0).OpenResource("wal-e")
c.Assert(err, jc.ErrorIsNil)
c.Assert(opened.Resource, gc.DeepEquals, res)
err = opened.Close()
c.Assert(err, jc.ErrorIsNil)
}
func (s *OpenerSuite) setupMocks(c *gc.C, includeUnit bool) *gomock.Controller {
ctrl := gomock.NewController(c)
if includeUnit {
s.unitName = "postgresql/0"
}
s.appName = "postgresql"
s.resourceGetter = mocks.NewMockResourceGetter(ctrl)
s.resources = mocks.NewMockResources(ctrl)
s.limiter = mocks.NewMockResourceDownloadLock(ctrl)
s.charmURL, _ = charm.ParseURL("postgresql")
rev := 0
s.charmOrigin = state.CharmOrigin{
Source: "charm-hub",
Type: "charm",
Revision: &rev,
Channel: &state.Channel{Risk: "stable"},
Platform: &state.Platform{
Architecture: "amd64",
OS: "ubuntu",
Channel: "20.04/stable",
},
}
return ctrl
}
func (s *OpenerSuite) expectCacheMethods(res resources.Resource, numConcurrentRequests int) {
if s.unitName != "" {
s.resources.EXPECT().OpenResourceForUniter("postgresql/0", "wal-e").DoAndReturn(func(unitName, resName string) (resources.Resource, io.ReadCloser, error) {
s.unleash.Lock()
defer s.unleash.Unlock()
return resources.Resource{}, io.NopCloser(bytes.NewBuffer([]byte{})), errors.NotFoundf("wal-e")
})
} else {
s.resources.EXPECT().OpenResource("postgresql", "wal-e").Return(resources.Resource{}, io.NopCloser(bytes.NewBuffer([]byte{})), errors.NotFoundf("wal-e"))
}
s.resources.EXPECT().GetResource("postgresql", "wal-e").Return(res, nil)
s.resources.EXPECT().SetResource("postgresql", "", res.Resource, gomock.Any(), state.DoNotIncrementCharmModifiedVersion).Return(res, nil)
other := res
other.ApplicationID = "postgreql"
if s.unitName != "" {
s.resources.EXPECT().OpenResourceForUniter("postgresql/0", "wal-e").Return(other, io.NopCloser(bytes.NewBuffer([]byte{})), nil).Times(numConcurrentRequests)
} else {
s.resources.EXPECT().OpenResource("postgresql", "wal-e").Return(other, io.NopCloser(bytes.NewBuffer([]byte{})), nil)
}
}
func (s *OpenerSuite) TestGetResourceErrorReleasesLock(c *gc.C) {
defer s.setupMocks(c, true).Finish()
fp, _ := charmresource.ParseFingerprint("38b060a751ac96384cd9327eb1b1e36a21fdb71114be07434c0cc7bf63f6e1da274edebfe76f65fbd51ad2f14898b95b")
res := resources.Resource{
Resource: charmresource.Resource{
Meta: charmresource.Meta{
Name: "wal-e",
Type: 1,
},
Origin: 2,
Revision: 0,
Fingerprint: fp,
Size: 0,
},
ApplicationID: "postgreql",
}
s.resources.EXPECT().OpenResourceForUniter("postgresql/0", "wal-e").DoAndReturn(func(unitName, resName string) (resources.Resource, io.ReadCloser, error) {
s.unleash.Lock()
defer s.unleash.Unlock()
return resources.Resource{}, io.NopCloser(bytes.NewBuffer([]byte{})), errors.NotFoundf("wal-e")
})
s.resources.EXPECT().GetResource("postgresql", "wal-e").Return(res, nil)
const retryCount = 3
s.resourceGetter.EXPECT().GetResource(gomock.Any()).Return(resource.ResourceData{}, errors.New("boom")).Times(retryCount)
s.limiter.EXPECT().Acquire("uuid:postgresql")
s.limiter.EXPECT().Release("uuid:postgresql")
opened, err := s.newOpener(-1).OpenResource("wal-e")
c.Assert(err, gc.ErrorMatches, "failed after retrying: boom")
c.Check(opened, gc.NotNil)
c.Check(opened.Resource, gc.DeepEquals, resources.Resource{})
c.Check(opened.ReadCloser, gc.IsNil)
}
func (s *OpenerSuite) newOpener(maxRequests int) *resource.ResourceOpener {
tag, _ := names.ParseUnitTag("postgresql/0")
var limiter resource.ResourceDownloadLock = resource.NewResourceDownloadLimiter(maxRequests, 0)
if maxRequests < 0 {
limiter = s.limiter
}
return resource.NewResourceOpenerForTest(
s.resources,
tag,
s.unitName,
s.appName,
s.charmURL,
s.charmOrigin,
resource.NewResourceRetryClientForTest(s.resourceGetter),
limiter,
)
}