1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package workers
import (
"context"
"errors"
"codeberg.org/gruf/go-runners"
"codeberg.org/gruf/go-structr"
"github.com/superseriousbusiness/gotosocial/internal/log"
"github.com/superseriousbusiness/gotosocial/internal/queue"
"github.com/superseriousbusiness/gotosocial/internal/util"
)
// MsgWorkerPool wraps multiple MsgWorker{}s in
// a singular struct for easy multi start / stop.
type MsgWorkerPool[Msg any] struct {
// Process handles queued message types.
Process func(context.Context, Msg) error
// Queue is embedded queue.StructQueue{}
// passed to each of the pool Worker{}s.
Queue queue.StructQueue[Msg]
// internal fields.
workers []*MsgWorker[Msg]
}
// Init will initialize the worker pool queue with given struct indices.
func (p *MsgWorkerPool[T]) Init(indices []structr.IndexConfig) {
p.Queue.Init(structr.QueueConfig[T]{Indices: indices})
}
// Start will attempt to start 'n' Worker{}s.
func (p *MsgWorkerPool[T]) Start(n int) {
// Check whether workers are
// set (is already running).
ok := (len(p.workers) > 0)
if ok {
return
}
// Allocate new msg workers slice.
p.workers = make([]*MsgWorker[T], n)
for i := range p.workers {
// Allocate new MsgWorker[T]{}.
p.workers[i] = new(MsgWorker[T])
p.workers[i].Process = p.Process
p.workers[i].Queue = &p.Queue
// Attempt to start worker.
// Return bool not useful
// here, as true = started,
// false = already running.
_ = p.workers[i].Start()
}
}
// Stop will attempt to stop contained Worker{}s.
func (p *MsgWorkerPool[T]) Stop() {
// Check whether workers are
// set (is currently running).
ok := (len(p.workers) == 0)
if ok {
return
}
// Stop all running workers.
for i := range p.workers {
// return bool not useful
// here, as true = stopped,
// false = never running.
_ = p.workers[i].Stop()
}
// Unset workers slice.
p.workers = p.workers[:0]
}
// MsgWorker wraps a processing function to
// feed from a queue.StructQueue{} for messages
// to process. It does so in a single goroutine
// with state management utilities.
type MsgWorker[Msg any] struct {
// Process handles queued message types.
Process func(context.Context, Msg) error
// Queue is the Delivery{} message queue
// that delivery worker will feed from.
Queue *queue.StructQueue[Msg]
// internal fields.
service runners.Service
}
// Start will attempt to start the Worker{}.
func (w *MsgWorker[T]) Start() bool {
return w.service.GoRun(w.run)
}
// Stop will attempt to stop the Worker{}.
func (w *MsgWorker[T]) Stop() bool {
return w.service.Stop()
}
// run wraps process to restart on any panic.
func (w *MsgWorker[T]) run(ctx context.Context) {
if w.Process == nil || w.Queue == nil {
panic("not yet initialized")
}
util.Must(func() { w.process(ctx) })
}
// process is the main delivery worker processing routine.
func (w *MsgWorker[T]) process(ctx context.Context) {
if w.Process == nil || w.Queue == nil {
// we perform this check here just
// to ensure the compiler knows these
// variables aren't nil in the loop,
// even if already checked by caller.
panic("not yet initialized")
}
for {
// Block until pop next message.
msg, ok := w.Queue.PopCtx(ctx)
if !ok {
return
}
// Attempt to process message.
err := w.Process(ctx, msg)
if err != nil {
log.Errorf(ctx, "%p: error processing: %v", w, err)
if errors.Is(err, context.Canceled) &&
ctx.Err() != nil {
// In the case of our own context
// being cancelled, push message
// back onto queue for persisting.
//
// Note we specifically check against
// context.Canceled here as it will
// be faster than the mutex lock of
// ctx.Err(), so gives an initial
// faster check in the if-clause.
w.Queue.Push(msg)
break
}
}
}
}
|
