forked from juju/charmstore
/
singleinclude.go
52 lines (43 loc) · 1.61 KB
/
singleinclude.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
// Copyright 2014 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE file for details.
package router
import (
"encoding/json"
"net/url"
"gopkg.in/errgo.v1"
"gopkg.in/juju/charm.v4"
)
var _ BulkIncludeHandler = SingleIncludeHandler(nil)
// SingleIncludeHandler implements BulkMetaHander for a non-batching
// metadata retrieval function that can perform a GET only.
type SingleIncludeHandler func(id *charm.Reference, path string, flags url.Values) (interface{}, error)
// Key implements BulkMetadataHander.Key.
func (h SingleIncludeHandler) Key() interface{} {
// Use a local type so that we are guaranteed that nothing
// other than SingleIncludeHandler can generate that key.
type singleMetaHandlerKey struct{}
return singleMetaHandlerKey(singleMetaHandlerKey{})
}
// HandleGet implements BulkMetadataHander.HandleGet.
func (h SingleIncludeHandler) HandleGet(hs []BulkIncludeHandler, id *charm.Reference, paths []string, flags url.Values) ([]interface{}, error) {
results := make([]interface{}, len(hs))
for i, h := range hs {
h := h.(SingleIncludeHandler)
result, err := h(id, paths[i], flags)
if err != nil {
// TODO(rog) include index of failed handler.
return nil, errgo.Mask(err, errgo.Any)
}
results[i] = result
}
return results, nil
}
var errPutNotImplemented = errgo.New("PUT not implemented")
// HandlePut implements BulkMetadataHander.HandlePut.
func (h SingleIncludeHandler) HandlePut(hs []BulkIncludeHandler, id *charm.Reference, paths []string, values []*json.RawMessage) []error {
errs := make([]error, len(hs))
for i := range hs {
errs[i] = errPutNotImplemented
}
return errs
}