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Viewing changes to src/github.com/juju/juju/worker/uniter/runner/jujuc/is-leader.go

  • Committer: Nicholas Skaggs
  • Date: 2016-10-24 20:56:05 UTC
  • Revision ID: nicholas.skaggs@canonical.com-20161024205605-z8lta0uvuhtxwzwl
Initi with beta15

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src/github.com/juju/juju/worker/uniter/runner/jujuc/is-leader.go
 
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// Copyright 2015 Canonical Ltd.
 
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// Licensed under the AGPLv3, see LICENCE file for details.
 
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package jujuc
 
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import (
 
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        "github.com/juju/cmd"
 
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        "github.com/juju/errors"
 
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        "launchpad.net/gnuflag"
 
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)
 
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// isLeaderCommand implements the is-leader command.
 
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type isLeaderCommand struct {
 
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        cmd.CommandBase
 
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        ctx Context
 
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        out cmd.Output
 
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}
 
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// NewIsLeaderCommand returns a new isLeaderCommand with the given context.
 
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func NewIsLeaderCommand(ctx Context) (cmd.Command, error) {
 
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        return &isLeaderCommand{ctx: ctx}, nil
 
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}
 
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// Info is part of the cmd.Command interface.
 
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func (c *isLeaderCommand) Info() *cmd.Info {
 
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        doc := `
 
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is-leader prints a boolean indicating whether the local unit is guaranteed to
 
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be service leader for at least 30 seconds. If it fails, you should assume that
 
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there is no such guarantee.
 
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`
 
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        return &cmd.Info{
 
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                Name:    "is-leader",
 
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                Purpose: "print service leadership status",
 
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                Doc:     doc,
 
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        }
 
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}
 
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// SetFlags is part of the cmd.Command interface.
 
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func (c *isLeaderCommand) SetFlags(f *gnuflag.FlagSet) {
 
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        c.out.AddFlags(f, "smart", cmd.DefaultFormatters)
 
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}
 
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// Run is part of the cmd.Command interface.
 
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func (c *isLeaderCommand) Run(ctx *cmd.Context) error {
 
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        success, err := c.ctx.IsLeader()
 
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        if err != nil {
 
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                return errors.Annotatef(err, "leadership status unknown")
 
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        }
 
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        return c.out.Write(ctx, success)
 
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}