152 lines
3.0 KiB
Go
152 lines
3.0 KiB
Go
package cli
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import (
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"flag"
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"io/ioutil"
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"os"
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"strings"
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"time"
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"github.com/imdario/mergo"
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"github.com/micro/cli"
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"github.com/micro/go-micro/config/cmd"
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"github.com/micro/go-micro/config/source"
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)
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type cliSource struct {
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opts source.Options
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ctx *cli.Context
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}
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func (c *cliSource) Read() (*source.ChangeSet, error) {
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var changes map[string]interface{}
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for _, name := range c.ctx.GlobalFlagNames() {
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tmp := toEntry(name, c.ctx.GlobalGeneric(name))
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mergo.Map(&changes, tmp) // need to sort error handling
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}
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for _, name := range c.ctx.FlagNames() {
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tmp := toEntry(name, c.ctx.Generic(name))
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mergo.Map(&changes, tmp) // need to sort error handling
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}
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b, err := c.opts.Encoder.Encode(changes)
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if err != nil {
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return nil, err
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}
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cs := &source.ChangeSet{
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Format: c.opts.Encoder.String(),
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Data: b,
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Timestamp: time.Now(),
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Source: c.String(),
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}
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cs.Checksum = cs.Sum()
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return cs, nil
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}
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func toEntry(name string, v interface{}) map[string]interface{} {
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n := strings.ToLower(name)
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keys := strings.FieldsFunc(n, split)
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reverse(keys)
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tmp := make(map[string]interface{})
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for i, k := range keys {
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if i == 0 {
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tmp[k] = v
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continue
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}
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tmp = map[string]interface{}{k: tmp}
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}
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return tmp
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}
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func reverse(ss []string) {
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for i := len(ss)/2 - 1; i >= 0; i-- {
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opp := len(ss) - 1 - i
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ss[i], ss[opp] = ss[opp], ss[i]
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}
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}
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func split(r rune) bool {
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return r == '-' || r == '_'
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}
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func (c *cliSource) Watch() (source.Watcher, error) {
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return source.NewNoopWatcher()
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}
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// Write is unsupported
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func (c *cliSource) Write(cs *source.ChangeSet) error {
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return nil
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}
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func (c *cliSource) String() string {
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return "cli"
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}
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// NewSource returns a config source for integrating parsed flags from a micro/cli.Context.
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// Hyphens are delimiters for nesting, and all keys are lowercased. The assumption is that
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// command line flags have already been parsed.
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//
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// Example:
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// cli.StringFlag{Name: "db-host"},
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//
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//
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// {
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// "database": {
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// "host": "localhost"
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// }
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// }
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func NewSource(opts ...source.Option) source.Source {
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options := source.NewOptions(opts...)
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var ctx *cli.Context
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c, ok := options.Context.Value(contextKey{}).(*cli.Context)
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if ok {
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ctx = c
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}
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// no context
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if ctx == nil {
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// get the default app/flags
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app := cmd.App()
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flags := app.Flags
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// create flagset
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set := flag.NewFlagSet(app.Name, flag.ContinueOnError)
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// apply flags to set
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for _, f := range flags {
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f.Apply(set)
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}
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// parse flags
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set.SetOutput(ioutil.Discard)
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set.Parse(os.Args[1:])
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// normalise flags
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normalizeFlags(app.Flags, set)
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// create context
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ctx = cli.NewContext(app, set, nil)
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}
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return &cliSource{
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ctx: ctx,
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opts: options,
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}
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}
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// WithContext returns a new source with the context specified.
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// The assumption is that Context is retrieved within an app.Action function.
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func WithContext(ctx *cli.Context, opts ...source.Option) source.Source {
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return &cliSource{
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ctx: ctx,
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opts: source.NewOptions(opts...),
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}
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}
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