package cli import ( "flag" "io/ioutil" "os" "strings" "time" "github.com/imdario/mergo" "github.com/micro/cli/v2" "github.com/micro/go-micro/v2/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...), } }