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Published: May 19, 2017 License: LGPL-3.0 Imports: 17 Imported by: 0



The concat package implements a charm that takes all the string values from units on upstream relations, concatenates them and makes them available to downstream relations.

This provides a silly but simple example that allows the exploration of relation behaviour in Juju.

For example, here's an example of this being used from the juju-utils repository:

juju deploy local:concat concattop
juju deploy local:concat concat1
juju deploy local:concat concat2
juju deploy local:concat concatjoin
juju add-relation concattop:downstream concat1:upstream
juju add-relation concattop:downstream concat2:upstream
juju add-relation concat1:downstream concatjoin:upstream
juju add-relation concat2:downstream concatjoin:upstream
juju set concattop 'val=top'
juju set concat1 'val=concat1'
juju set concat2 'val=concat2'
juju set concatjoin 'val=concatjoin'

The final value of the downstream relation provided by by the concatjoin service in this case will be:

{concatjoin {concat2 {top}} {concat1 {top}}}

Feedback loops can be arranged for further amusement.



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func RegisterHooks

func RegisterHooks(r *hook.Registry)


type ConcatServer

type ConcatServer struct {
	// contains filtered or unexported fields

ConcatServer defines the operations on the service's local RPC server that is used for communication between the charm and the running service.

Note that this type must be exported because of the rules about net/rpc types.

func (*ConcatServer) Set

func (svc *ConcatServer) Set(p *ServerState, _ *struct{}) error

SetVal sets the current value served by the HTTP server and starts the server running if it is not already started.

type ServerState

type ServerState struct {
	Val  string
	Port int

ServerState holds the state of a server.

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