github.com/wallyworld/juju@v0.0.0-20161013125918-6cf1bc9d917a/api/deployer/deployer.go (about)

     1  // Copyright 2012, 2013 Canonical Ltd.
     2  // Licensed under the AGPLv3, see LICENCE file for details.
     3  
     4  package deployer
     5  
     6  import (
     7  	"gopkg.in/juju/names.v2"
     8  
     9  	"github.com/juju/juju/api/base"
    10  	"github.com/juju/juju/api/common"
    11  	"github.com/juju/juju/apiserver/params"
    12  )
    13  
    14  const deployerFacade = "Deployer"
    15  
    16  // State provides access to the deployer worker's idea of the state.
    17  type State struct {
    18  	facade base.FacadeCaller
    19  	*common.APIAddresser
    20  }
    21  
    22  // NewState creates a new State instance that makes API calls
    23  // through the given caller.
    24  func NewState(caller base.APICaller) *State {
    25  	facadeCaller := base.NewFacadeCaller(caller, deployerFacade)
    26  	return &State{
    27  		facade:       facadeCaller,
    28  		APIAddresser: common.NewAPIAddresser(facadeCaller),
    29  	}
    30  
    31  }
    32  
    33  // unitLife returns the lifecycle state of the given unit.
    34  func (st *State) unitLife(tag names.UnitTag) (params.Life, error) {
    35  	return common.Life(st.facade, tag)
    36  }
    37  
    38  // Unit returns the unit with the given tag.
    39  func (st *State) Unit(tag names.UnitTag) (*Unit, error) {
    40  	life, err := st.unitLife(tag)
    41  	if err != nil {
    42  		return nil, err
    43  	}
    44  	return &Unit{
    45  		tag:  tag,
    46  		life: life,
    47  		st:   st,
    48  	}, nil
    49  }
    50  
    51  // Machine returns the machine with the given tag.
    52  func (st *State) Machine(tag names.MachineTag) (*Machine, error) {
    53  	// TODO(dfc) this cannot return an error any more
    54  	return &Machine{
    55  		tag: tag,
    56  		st:  st,
    57  	}, nil
    58  }
    59  
    60  // StateAddresses returns the list of addresses used to connect to the state.
    61  func (st *State) StateAddresses() ([]string, error) {
    62  	var result params.StringsResult
    63  	err := st.facade.FacadeCall("StateAddresses", nil, &result)
    64  	if err != nil {
    65  		return nil, err
    66  	}
    67  	return result.Result, nil
    68  }
    69  
    70  // ConnectionInfo returns all the address information that the deployer task
    71  // needs in one call.
    72  func (st *State) ConnectionInfo() (result params.DeployerConnectionValues, err error) {
    73  	err = st.facade.FacadeCall("ConnectionInfo", nil, &result)
    74  	return result, err
    75  }