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115 lines
3 KiB
Go
115 lines
3 KiB
Go
package client
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import (
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"reflect"
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"strings"
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flag "github.com/docker/libnetwork/client/mflag"
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)
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// CallFunc provides environment specific call utility to invoke backend functions from UI
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type CallFunc func(string, string, interface{}, map[string][]string) (io.ReadCloser, http.Header, int, error)
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// NetworkCli is the UI object for network subcmds
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type NetworkCli struct {
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out io.Writer
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err io.Writer
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call CallFunc
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}
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// NewNetworkCli is a convenient function to create a NetworkCli object
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func NewNetworkCli(out, err io.Writer, call CallFunc) *NetworkCli {
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return &NetworkCli{
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out: out,
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err: err,
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call: call,
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}
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}
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// getMethod is Borrowed from Docker UI which uses reflection to identify the UI Handler
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func (cli *NetworkCli) getMethod(args ...string) (func(string, ...string) error, bool) {
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camelArgs := make([]string, len(args))
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for i, s := range args {
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if len(s) == 0 {
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return nil, false
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}
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camelArgs[i] = strings.ToUpper(s[:1]) + strings.ToLower(s[1:])
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}
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methodName := "Cmd" + strings.Join(camelArgs, "")
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method := reflect.ValueOf(cli).MethodByName(methodName)
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if !method.IsValid() {
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return nil, false
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}
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return method.Interface().(func(string, ...string) error), true
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}
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// Cmd is borrowed from Docker UI and acts as the entry point for network UI commands.
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// network UI commands are designed to be invoked from multiple parent chains
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func (cli *NetworkCli) Cmd(chain string, args ...string) error {
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if len(args) > 2 {
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method, exists := cli.getMethod(args[:3]...)
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if exists {
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return method(chain+" "+args[0]+" "+args[1], args[3:]...)
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}
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}
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if len(args) > 1 {
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method, exists := cli.getMethod(args[:2]...)
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if exists {
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return method(chain+" "+args[0], args[2:]...)
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}
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}
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if len(args) > 0 {
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method, exists := cli.getMethod(args[0])
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if !exists {
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return fmt.Errorf("%s: '%s' is not a %s command. See '%s --help'", chain, args[0], chain, chain)
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}
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return method(chain, args[1:]...)
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}
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flag.Usage()
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return nil
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}
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// Subcmd is borrowed from Docker UI and performs the same function of configuring the subCmds
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func (cli *NetworkCli) Subcmd(chain, name, signature, description string, exitOnError bool) *flag.FlagSet {
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var errorHandling flag.ErrorHandling
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if exitOnError {
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errorHandling = flag.ExitOnError
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} else {
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errorHandling = flag.ContinueOnError
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}
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flags := flag.NewFlagSet(name, errorHandling)
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flags.Usage = func() {
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flags.ShortUsage()
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flags.PrintDefaults()
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}
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flags.ShortUsage = func() {
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options := ""
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if signature != "" {
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signature = " " + signature
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}
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if flags.FlagCountUndeprecated() > 0 {
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options = " [OPTIONS]"
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}
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fmt.Fprintf(cli.out, "\nUsage: %s %s%s%s\n\n%s\n\n", chain, name, options, signature, description)
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flags.SetOutput(cli.out)
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}
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return flags
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}
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func readBody(stream io.ReadCloser, hdr http.Header, statusCode int, err error) ([]byte, int, error) {
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if stream != nil {
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defer stream.Close()
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}
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if err != nil {
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return nil, statusCode, err
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}
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body, err := ioutil.ReadAll(stream)
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if err != nil {
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return nil, -1, err
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}
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return body, statusCode, nil
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}
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