146 lines
2.9 KiB
Go
146 lines
2.9 KiB
Go
package cli
|
|
|
|
import (
|
|
"flag"
|
|
"io/ioutil"
|
|
"os"
|
|
"strings"
|
|
"time"
|
|
|
|
"github.com/imdario/mergo"
|
|
"github.com/micro/cli/v2"
|
|
"github.com/micro/go-micro/v2/config/cmd"
|
|
"github.com/micro/go-micro/v2/config/source"
|
|
)
|
|
|
|
type cliSource struct {
|
|
opts source.Options
|
|
ctx *cli.Context
|
|
}
|
|
|
|
func (c *cliSource) Read() (*source.ChangeSet, error) {
|
|
var changes map[string]interface{}
|
|
|
|
// directly using app cli flags, to access default values of not specified options
|
|
for _, f := range c.ctx.App.Flags {
|
|
name := f.Names()[0]
|
|
tmp := toEntry(name, c.ctx.Generic(name))
|
|
mergo.Map(&changes, tmp) // need to sort error handling
|
|
}
|
|
|
|
b, err := c.opts.Encoder.Encode(changes)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
cs := &source.ChangeSet{
|
|
Format: c.opts.Encoder.String(),
|
|
Data: b,
|
|
Timestamp: time.Now(),
|
|
Source: c.String(),
|
|
}
|
|
cs.Checksum = cs.Sum()
|
|
|
|
return cs, nil
|
|
}
|
|
|
|
func toEntry(name string, v interface{}) map[string]interface{} {
|
|
n := strings.ToLower(name)
|
|
keys := strings.FieldsFunc(n, split)
|
|
reverse(keys)
|
|
tmp := make(map[string]interface{})
|
|
for i, k := range keys {
|
|
if i == 0 {
|
|
tmp[k] = v
|
|
continue
|
|
}
|
|
|
|
tmp = map[string]interface{}{k: tmp}
|
|
}
|
|
return tmp
|
|
}
|
|
|
|
func reverse(ss []string) {
|
|
for i := len(ss)/2 - 1; i >= 0; i-- {
|
|
opp := len(ss) - 1 - i
|
|
ss[i], ss[opp] = ss[opp], ss[i]
|
|
}
|
|
}
|
|
|
|
func split(r rune) bool {
|
|
return r == '-' || r == '_'
|
|
}
|
|
|
|
func (c *cliSource) Watch() (source.Watcher, error) {
|
|
return source.NewNoopWatcher()
|
|
}
|
|
|
|
// Write is unsupported
|
|
func (c *cliSource) Write(cs *source.ChangeSet) error {
|
|
return nil
|
|
}
|
|
|
|
func (c *cliSource) String() string {
|
|
return "cli"
|
|
}
|
|
|
|
// NewSource returns a config source for integrating parsed flags from a micro/cli.Context.
|
|
// Hyphens are delimiters for nesting, and all keys are lowercased. The assumption is that
|
|
// command line flags have already been parsed.
|
|
//
|
|
// Example:
|
|
// cli.StringFlag{Name: "db-host"},
|
|
//
|
|
//
|
|
// {
|
|
// "database": {
|
|
// "host": "localhost"
|
|
// }
|
|
// }
|
|
func NewSource(opts ...source.Option) source.Source {
|
|
options := source.NewOptions(opts...)
|
|
|
|
var ctx *cli.Context
|
|
|
|
if c, ok := options.Context.Value(contextKey{}).(*cli.Context); ok {
|
|
ctx = c
|
|
} else {
|
|
// no context
|
|
// get the default app/flags
|
|
app := cmd.App()
|
|
flags := app.Flags
|
|
|
|
// create flagset
|
|
set := flag.NewFlagSet(app.Name, flag.ContinueOnError)
|
|
|
|
// apply flags to set
|
|
for _, f := range flags {
|
|
f.Apply(set)
|
|
}
|
|
|
|
// parse flags
|
|
set.SetOutput(ioutil.Discard)
|
|
set.Parse(os.Args[1:])
|
|
|
|
// normalise flags
|
|
normalizeFlags(app.Flags, set)
|
|
|
|
// create context
|
|
ctx = cli.NewContext(app, set, nil)
|
|
}
|
|
|
|
return &cliSource{
|
|
ctx: ctx,
|
|
opts: options,
|
|
}
|
|
}
|
|
|
|
// WithContext returns a new source with the context specified.
|
|
// The assumption is that Context is retrieved within an app.Action function.
|
|
func WithContext(ctx *cli.Context, opts ...source.Option) source.Source {
|
|
return &cliSource{
|
|
ctx: ctx,
|
|
opts: source.NewOptions(opts...),
|
|
}
|
|
}
|