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media.go
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media.go
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// Copyright 2015 Zalando SE
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"errors"
"net/url"
)
type (
mediaType int
validateSelectFunc func([]*medium) (cmdArgs, error)
)
const (
stdin mediaType = 1 + iota
file
etcd
innkeeper
inline
inlineIds
patchPrepend
patchPrependFile
patchAppend
patchAppendFile
)
var commandToValidations = map[command]validateSelectFunc{
check: validateSelectRead,
print: validateSelectRead,
upsert: validateSelectWrite,
reset: validateSelectWrite,
delete: validateSelectDelete,
patch: validateSelectPatch}
type medium struct {
typ mediaType
urls []*url.URL
path string
eskip string
ids []string
oauthToken string
patchFilters string
patchFile string
}
var (
tooManyInputs = errors.New("too many inputs")
invalidInputType = errors.New("invalid input type")
missingInput = errors.New("missing input")
)
// validate medium from args, and check if it can be used
// as input.
// (check and print)
func validateSelectRead(media []*medium) (a cmdArgs, err error) {
if len(media) > 1 {
err = tooManyInputs
return
}
if len(media) == 0 {
a.in, err = processEtcdArgs(defaultEtcdUrls, defaultEtcdPrefix, "")
return
}
switch media[0].typ {
case inlineIds, patchPrepend, patchPrependFile, patchAppend, patchAppendFile:
err = invalidInputType
return
}
a.in = media[0]
return
}
// validate media from args, and check if input was specified.
func validateSelectWrite(media []*medium) (a cmdArgs, err error) {
if len(media) == 0 {
err = missingInput
return
}
if len(media) > 2 {
err = tooManyInputs
return
}
for _, m := range media {
switch media[0].typ {
case inlineIds, patchPrepend, patchPrependFile, patchAppend, patchAppendFile:
err = invalidInputType
return
}
if m.typ == etcd || m.typ == innkeeper {
a.out = m
} else {
a.in = m
}
}
if a.in == nil {
err = missingInput
}
return
}
func validateSelectDelete(media []*medium) (a cmdArgs, err error) {
if len(media) == 0 {
err = missingInput
return
}
if len(media) > 2 {
err = tooManyInputs
return
}
for _, m := range media {
switch media[0].typ {
case patchPrepend, patchPrependFile, patchAppend, patchAppendFile:
err = invalidInputType
return
}
if m.typ == etcd || m.typ == innkeeper {
a.out = m
} else {
a.in = m
}
}
if a.in == nil {
err = missingInput
}
return
}
func validateSelectPatch(media []*medium) (a cmdArgs, err error) {
for _, m := range media {
switch m.typ {
case patchPrepend, patchPrependFile, patchAppend, patchAppendFile:
case inlineIds:
err = invalidInputType
return
default:
if a.in != nil {
err = tooManyInputs
return
}
a.in = m
}
}
return
}
// Validates media from args for the current command, and selects input and/or output.
func validateSelectMedia(cmd command, media []*medium) (cmdArgs cmdArgs, err error) {
a, err := commandToValidations[cmd](media)
a.allMedia = media
return a, err
}