github.com/makyo/juju@v0.0.0-20160425123129-2608902037e9/api/proxyupdater/proxyupdater.go (about)

     1  // Copyright 2016 Canonical Ltd.
     2  // Licensed under the AGPLv3, see LICENCE file for details.
     3  
     4  package proxyupdater
     5  
     6  import (
     7  	"fmt"
     8  
     9  	"github.com/juju/errors"
    10  	"github.com/juju/juju/api/base"
    11  	apiwatcher "github.com/juju/juju/api/watcher"
    12  	"github.com/juju/juju/apiserver/params"
    13  	"github.com/juju/juju/watcher"
    14  	"github.com/juju/names"
    15  	"github.com/juju/utils/proxy"
    16  )
    17  
    18  const proxyUpdaterFacade = "ProxyUpdater"
    19  
    20  // API provides access to the ProxyUpdater API facade.
    21  type API struct {
    22  	tag    names.Tag
    23  	facade base.FacadeCaller
    24  }
    25  
    26  // NewAPI returns a new api client facade instance.
    27  func NewAPI(caller base.APICaller, tag names.Tag) (*API, error) {
    28  	if caller == nil {
    29  		return nil, fmt.Errorf("caller is nil")
    30  	}
    31  
    32  	if tag == nil {
    33  		return nil, fmt.Errorf("tag is nil")
    34  	}
    35  
    36  	return &API{
    37  		facade: base.NewFacadeCaller(caller, proxyUpdaterFacade),
    38  		tag:    tag,
    39  	}, nil
    40  }
    41  
    42  // WatchForProxyConfigAndAPIHostPortChanges returns a NotifyWatcher waiting for
    43  // changes in the proxy configuration or API host ports
    44  func (api *API) WatchForProxyConfigAndAPIHostPortChanges() (watcher.NotifyWatcher, error) {
    45  	var results params.NotifyWatchResults
    46  	args := params.Entities{
    47  		Entities: []params.Entity{{Tag: api.tag.String()}},
    48  	}
    49  	err := api.facade.FacadeCall("WatchForProxyConfigAndAPIHostPortChanges", args, &results)
    50  	if err != nil {
    51  		return nil, err
    52  	}
    53  	if len(results.Results) != 1 {
    54  		return nil, errors.Errorf("expected 1 result, got %d", len(results.Results))
    55  	}
    56  	result := results.Results[0]
    57  	if result.Error != nil {
    58  		return nil, result.Error
    59  	}
    60  
    61  	return newNotifyWatcher(api.facade.RawAPICaller(), result), nil
    62  }
    63  
    64  var newNotifyWatcher = apiwatcher.NewNotifyWatcher
    65  
    66  func proxySettingsParamToProxySettings(cfg params.ProxyConfig) proxy.Settings {
    67  	return proxy.Settings{
    68  		Http:    cfg.HTTP,
    69  		Https:   cfg.HTTPS,
    70  		Ftp:     cfg.FTP,
    71  		NoProxy: cfg.NoProxy,
    72  	}
    73  }
    74  
    75  // ProxyConfig returns the proxy settings for the current environment
    76  func (api *API) ProxyConfig() (proxySettings, APTProxySettings proxy.Settings, err error) {
    77  	var results params.ProxyConfigResults
    78  	args := params.Entities{
    79  		Entities: []params.Entity{{Tag: api.tag.String()}},
    80  	}
    81  	err = api.facade.FacadeCall("ProxyConfig", args, &results)
    82  	if err != nil {
    83  		return proxySettings, APTProxySettings, err
    84  	}
    85  	if len(results.Results) != 1 {
    86  		return proxySettings, APTProxySettings, errors.NotFoundf("ProxyConfig for %q", api.tag)
    87  	}
    88  	result := results.Results[0]
    89  	proxySettings = proxySettingsParamToProxySettings(result.ProxySettings)
    90  	APTProxySettings = proxySettingsParamToProxySettings(result.APTProxySettings)
    91  	return proxySettings, APTProxySettings, nil
    92  }