53cabd5ee4
This was the initial cut of the retry and delay meta parameters. Instead, I decided to move the delay action into the common space outside of the Watch resource. This is more complicated in the short term, but will be more beneficial in the long run as each resource won't have to implement this part itself (even if it uses boiler plate). This is the first version of this patch without this fix. I decided to include it because I think it has more correct event processing.
117 lines
3.0 KiB
Go
117 lines
3.0 KiB
Go
// Mgmt
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// Copyright (C) 2013-2016+ James Shubin and the project contributors
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// Written by James Shubin <james@shubin.ca> and the project contributors
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package main
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import (
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"fmt"
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)
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//go:generate stringer -type=eventName -output=eventname_stringer.go
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type eventName int
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const (
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eventNil eventName = iota
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eventExit
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eventStart
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eventPause
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eventPoke
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eventBackPoke
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)
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// Resp is a channel to be used for boolean responses. A nil represents an ACK,
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// and a non-nil represents a NACK (false). This also lets us use custom errors.
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type Resp chan error
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// Event is the main struct that stores event information and responses.
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type Event struct {
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Name eventName
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Resp Resp // channel to send an ack response on, nil to skip
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//Wg *sync.WaitGroup // receiver barrier to Wait() for everyone else on
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Msg string // some words for fun
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Activity bool // did something interesting happen?
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}
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// ACK sends a single acknowledgement on the channel if one was requested.
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func (event *Event) ACK() {
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if event.Resp != nil { // if they've requested an ACK
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event.Resp.ACK()
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}
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}
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// NACK sends a negative acknowledgement message on the channel if one was requested.
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func (event *Event) NACK() {
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if event.Resp != nil { // if they've requested a NACK
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event.Resp.NACK()
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}
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}
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// ACKNACK sends a custom ACK or NACK message on the channel if one was requested.
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func (event *Event) ACKNACK(err error) {
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if event.Resp != nil { // if they've requested a NACK
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event.Resp.ACKNACK(err)
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}
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}
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// NewResp is just a helper to return the right type of response channel.
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func NewResp() Resp {
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resp := make(chan error)
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return resp
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}
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// ACK sends a true value to resp.
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func (resp Resp) ACK() {
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if resp != nil {
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resp <- nil
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}
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}
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// NACK sends a false value to resp.
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func (resp Resp) NACK() {
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if resp != nil {
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resp <- fmt.Errorf("NACK")
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}
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}
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// ACKNACK sends a custom ACK or NACK. The ACK value is always nil, the NACK can
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// be any non-nil error value.
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func (resp Resp) ACKNACK(err error) {
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if resp != nil {
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resp <- err
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}
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}
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// Wait waits for any response from a Resp channel and returns it.
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func (resp Resp) Wait() error {
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return <-resp
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}
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// ACKWait waits for a +ive Ack from a Resp channel.
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func (resp Resp) ACKWait() {
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for {
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// wait until true value
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if resp.Wait() == nil {
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return
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}
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}
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}
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// GetActivity returns the activity value.
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func (event *Event) GetActivity() bool {
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return event.Activity
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}
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