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// Copyright 2016 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package common
import (
"fmt"
"io/ioutil"
"strings"
"github.com/juju/cmd"
"github.com/juju/errors"
"github.com/juju/juju/constraints"
"github.com/juju/utils"
"gopkg.in/yaml.v2"
)
// ConfigFlag records k=v attributes from command arguments
// and/or specified files containing key values.
type ConfigFlag struct {
files []string
attrs map[string]interface{}
}
// Set implements gnuflag.Value.Set.
func (f *ConfigFlag) Set(s string) error {
if s == "" {
return errors.NotValidf("empty string")
}
fields := strings.SplitN(s, "=", 2)
if len(fields) == 1 {
f.files = append(f.files, fields[0])
return nil
}
var value interface{}
if err := yaml.Unmarshal([]byte(fields[1]), &value); err != nil {
return errors.Trace(err)
}
if f.attrs == nil {
f.attrs = make(map[string]interface{})
}
f.attrs[fields[0]] = value
return nil
}
// ReadAttrs reads attributes from the specified files, and then overlays
// the results with the k=v attributes.
func (f *ConfigFlag) ReadAttrs(ctx *cmd.Context) (map[string]interface{}, error) {
attrs := make(map[string]interface{})
for _, f := range f.files {
path, err := utils.NormalizePath(f)
if err != nil {
return nil, errors.Trace(err)
}
data, err := ioutil.ReadFile(ctx.AbsPath(path))
if err != nil {
return nil, errors.Trace(err)
}
if err := yaml.Unmarshal(data, &attrs); err != nil {
return nil, err
}
}
for k, v := range f.attrs {
attrs[k] = v
}
return attrs, nil
}
// String implements gnuflag.Value.String.
func (f *ConfigFlag) String() string {
strs := make([]string, 0, len(f.attrs)+len(f.files))
for _, f := range f.files {
strs = append(strs, f)
}
for k, v := range f.attrs {
strs = append(strs, fmt.Sprintf("%s=%v", k, v))
}
return strings.Join(strs, " ")
}
// WarnConstraintAliases shows a warning to the user that they have used an
// alias for a constraint that might go away sometime.
func WarnConstraintAliases(ctx *cmd.Context, aliases map[string]string) {
for alias, canonical := range aliases {
ctx.Infof("Warning: constraint %q is deprecated in favor of %q.\n", alias, canonical)
}
}
// ParseConstraints parses the given constraints and uses WarnConstraintAliases
// if any aliases were used.
func ParseConstraints(ctx *cmd.Context, cons string) (constraints.Value, error) {
if cons == "" {
return constraints.Value{}, nil
}
constraint, aliases, err := constraints.ParseWithAliases(cons)
// we always do these, even on errors, so that the error messages have
// context.
for alias, canonical := range aliases {
ctx.Infof("Warning: constraint %q is deprecated in favor of %q.\n", alias, canonical)
}
if err != nil {
return constraints.Value{}, err
}
return constraint, nil
}
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