// Fetch returns a list of images for the specified cloud matching the constraint.
// The base URL locations are as specified - the first location which has a file is the one used.
// Signed data is preferred, but if there is no signed data available and onlySigned is false,
// then unsigned data is used.
func Fetch(
sources []simplestreams.DataSource, indexPath string, cons *ImageConstraint,
onlySigned bool) ([]*ImageMetadata, *simplestreams.ResolveInfo, error) {
params := simplestreams.ValueParams{
DataType: ImageIds,
FilterFunc: appendMatchingImages,
ValueTemplate: ImageMetadata{},
PublicKey: simplestreamsImagesPublicKey,
}
items, resolveInfo, err := simplestreams.GetMetadata(sources, indexPath, cons, onlySigned, params)
if err != nil {
return nil, resolveInfo, err
}
metadata := make([]*ImageMetadata, len(items))
for i, md := range items {
metadata[i] = md.(*ImageMetadata)
}
// Sorting the metadata is not strictly necessary, but it ensures consistent ordering for
// all compilers, and it just makes it easier to look at the data.
Sort(metadata)
return metadata, resolveInfo, nil
}
func (s *simplestreamsSuite) TestGetMetadataNoMatching(c *gc.C) {
source := &countingSource{
DataSource: simplestreams.NewURLDataSource(
"test", "test:/daily", utils.VerifySSLHostnames,
),
}
sources := []simplestreams.DataSource{source, source, source}
params := simplestreams.ValueParams{DataType: "image-ids"}
constraint := sstesting.NewTestConstraint(simplestreams.LookupParams{
CloudSpec: simplestreams.CloudSpec{
Region: "us-east-1",
Endpoint: "https://ec2.us-east-1.amazonaws.com",
},
Series: []string{"precise"},
Arches: []string{"not-a-real-arch"}, // never matches
})
items, resolveInfo, err := simplestreams.GetMetadata(
sources,
simplestreams.DefaultIndexPath,
constraint,
false,
params,
)
c.Assert(err, gc.IsNil)
c.Assert(items, gc.HasLen, 0)
c.Assert(resolveInfo, gc.DeepEquals, &simplestreams.ResolveInfo{
Source: "test",
Signed: false,
IndexURL: "test:/daily/streams/v1/index.json",
MirrorURL: "",
})
// There should be 2 calls to each data-source:
// one for .sjson, one for .json.
c.Assert(source.count, gc.Equals, 2*len(sources))
}