95 lines
2.4 KiB
Go
95 lines
2.4 KiB
Go
package command
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import (
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"bufio"
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"flag"
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"io"
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"os"
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"strings"
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"github.com/hashicorp/nomad/api"
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"github.com/mitchellh/cli"
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)
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const (
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// Names of environment variables used to supply various
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// config options to the Nomad CLI.
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EnvNomadAddress = "NOMAD_ADDR"
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// Constants for CLI identifier length
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shortId = 8
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fullId = 36
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)
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// FlagSetFlags is an enum to define what flags are present in the
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// default FlagSet returned by Meta.FlagSet.
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type FlagSetFlags uint
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const (
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FlagSetNone FlagSetFlags = 0
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FlagSetClient FlagSetFlags = 1 << iota
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FlagSetDefault = FlagSetClient
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)
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// Meta contains the meta-options and functionality that nearly every
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// Nomad command inherits.
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type Meta struct {
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Ui cli.Ui
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// These are set by the command line flags.
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flagAddress string
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}
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// FlagSet returns a FlagSet with the common flags that every
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// command implements. The exact behavior of FlagSet can be configured
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// using the flags as the second parameter, for example to disable
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// server settings on the commands that don't talk to a server.
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func (m *Meta) FlagSet(n string, fs FlagSetFlags) *flag.FlagSet {
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f := flag.NewFlagSet(n, flag.ContinueOnError)
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// FlagSetClient is used to enable the settings for specifying
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// client connectivity options.
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if fs&FlagSetClient != 0 {
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f.StringVar(&m.flagAddress, "address", "", "")
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}
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// Create an io.Writer that writes to our UI properly for errors.
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// This is kind of a hack, but it does the job. Basically: create
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// a pipe, use a scanner to break it into lines, and output each line
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// to the UI. Do this forever.
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errR, errW := io.Pipe()
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errScanner := bufio.NewScanner(errR)
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go func() {
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for errScanner.Scan() {
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m.Ui.Error(errScanner.Text())
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}
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}()
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f.SetOutput(errW)
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return f
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}
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// Client is used to initialize and return a new API client using
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// the default command line arguments and env vars.
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func (m *Meta) Client() (*api.Client, error) {
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config := api.DefaultConfig()
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if v := os.Getenv(EnvNomadAddress); v != "" {
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config.Address = v
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}
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if m.flagAddress != "" {
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config.Address = m.flagAddress
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}
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return api.NewClient(config)
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}
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// generalOptionsUsage returns the help string for the global options.
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func generalOptionsUsage() string {
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helpText := `
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-address=<addr>
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The address of the Nomad server.
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Overrides the NOMAD_ADDR environment variable if set.
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Default = http://127.0.0.1:4646
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`
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return strings.TrimSpace(helpText)
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}
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