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filters: don't encode an empty set. update comments

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Docker-DCO-1.1-Signed-off-by: Vincent Batts <vbatts@redhat.com> (github: vbatts)
This commit is contained in:
Vincent Batts 2014-05-30 15:55:40 -04:00
parent 89a15fa235
commit 3a4e3ca327
2 changed files with 31 additions and 14 deletions
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30
utils/filters/parse.go
View file

@ -8,14 +8,12 @@ import (
type Args map[string][]string type Args map[string][]string
/* // Parse the argument to the filter flag. Like
Parse the argument to the filter flag. Like //
// `docker ps -f 'created=today' -f 'image.name=ubuntu*'`
`docker ps -f 'created=today' -f 'image.name=ubuntu*'` //
// If prev map is provided, then it is appended to, and returned. By default a new
If prev map is provided, then it is appended to, and returned. By default a new // map is created.
map is created.
*/
func ParseFlag(arg string, prev Args) (Args, error) { func ParseFlag(arg string, prev Args) (Args, error) {
var filters Args = prev var filters Args = prev
if prev == nil { if prev == nil {
@ -37,10 +35,13 @@ func ParseFlag(arg string, prev Args) (Args, error) {
var ErrorBadFormat = errors.New("bad format of filter (expected name=value)") var ErrorBadFormat = errors.New("bad format of filter (expected name=value)")
/* // packs the Args into an string for easy transport from client to server
packs the Args into an string for easy transport from client to server
*/
func ToParam(a Args) (string, error) { func ToParam(a Args) (string, error) {
// this way we don't URL encode {}, just empty space
if len(a) == 0 {
return "", nil
}
buf, err := json.Marshal(a) buf, err := json.Marshal(a)
if err != nil { if err != nil {
return "", err return "", err
@ -48,11 +49,12 @@ func ToParam(a Args) (string, error) {
return string(buf), nil return string(buf), nil
} }
/* // unpacks the filter Args
unpacks the filter Args
*/
func FromParam(p string) (Args, error) { func FromParam(p string) (Args, error) {
args := Args{} args := Args{}
if len(p) == 0 {
return args, nil
}
err := json.Unmarshal([]byte(p), &args) err := json.Unmarshal([]byte(p), &args)
if err != nil { if err != nil {
return nil, err return nil, err

15
utils/filters/parse_test.go
View file

@ -61,3 +61,18 @@ func TestParam(t *testing.T) {
} }
} }
} }
func TestEmpty(t *testing.T) {
a := Args{}
v, err := ToParam(a)
if err != nil {
t.Errorf("failed to marshal the filters: %s", err)
}
v1, err := FromParam(v)
if err != nil {
t.Errorf("%s", err)
}
if len(a) != len(v1) {
t.Errorf("these should both be empty sets")
}
}