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Viewing changes to src/github.com/juju/juju/apiserver/charmrevisionupdater/handlers.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/apiserver/charmrevisionupdater/handlers.go
 
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// Copyright 2016 Canonical Ltd.
 
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// Licensed under the AGPLv3, see LICENCE file for details.
 
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package charmrevisionupdater
 
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import (
 
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        "fmt"
 
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        "github.com/juju/errors"
 
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        "gopkg.in/juju/names.v2"
 
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        "github.com/juju/juju/charmstore"
 
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        "github.com/juju/juju/state"
 
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)
 
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// LatestCharmHandler exposes the functionality needed to deal with
 
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// the latest info (from the store) for a charm.
 
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type LatestCharmHandler interface {
 
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        // HandleLatest deals with the given charm info, treating it as the
 
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        // most up-to-date information for the charms most recent revision.
 
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        HandleLatest(names.ApplicationTag, charmstore.CharmInfo) error
 
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}
 
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type newHandlerFunc func(*state.State) (LatestCharmHandler, error)
 
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var registeredHandlers = map[string]newHandlerFunc{}
 
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// RegisterLatestCharmHandler adds the factory func for the identified
 
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// handler to the handler registry.
 
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func RegisterLatestCharmHandler(name string, newHandler newHandlerFunc) error {
 
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        if _, ok := registeredHandlers[name]; ok {
 
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                msg := fmt.Sprintf(`"latest charm" handler %q already registered`, name)
 
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                return errors.NewAlreadyExists(nil, msg)
 
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        }
 
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        registeredHandlers[name] = newHandler
 
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        return nil
 
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}
 
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func createHandlers(st *state.State) ([]LatestCharmHandler, error) {
 
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        var handlers []LatestCharmHandler
 
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        for _, newHandler := range registeredHandlers {
 
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                handler, err := newHandler(st)
 
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                if err != nil {
 
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                        return nil, errors.Trace(err)
 
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                }
 
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                handlers = append(handlers, handler)
 
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        }
 
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        return handlers, nil
 
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}