woodpecker/server/queue/queue.go

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// Copyright 2023 Woodpecker Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
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package queue
import (
"context"
"errors"
"strings"
"go.woodpecker-ci.org/woodpecker/v2/server/model"
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)
var (
// ErrCancel indicates the task was canceled.
ErrCancel = errors.New("queue: task canceled")
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// ErrNotFound indicates the task was not found in the queue.
ErrNotFound = errors.New("queue: task not found")
)
// InfoT provides runtime information.
type InfoT struct {
Pending []*model.Task `json:"pending"`
WaitingOnDeps []*model.Task `json:"waiting_on_deps"`
Running []*model.Task `json:"running"`
Stats struct {
Workers int `json:"worker_count"`
Pending int `json:"pending_count"`
WaitingOnDeps int `json:"waiting_on_deps_count"`
Running int `json:"running_count"`
Complete int `json:"completed_count"`
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} `json:"stats"`
Paused bool `json:"paused"`
} // @name InfoT
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func (t *InfoT) String() string {
var sb strings.Builder
for _, task := range t.Pending {
sb.WriteString("\t" + task.String())
}
for _, task := range t.Running {
sb.WriteString("\t" + task.String())
}
for _, task := range t.WaitingOnDeps {
sb.WriteString("\t" + task.String())
}
return sb.String()
}
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// Filter filters tasks in the queue. If the Filter returns false,
// the Task is skipped and not returned to the subscriber.
type FilterFn func(*model.Task) bool
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// Queue defines a task queue for scheduling tasks among
// a pool of workers.
type Queue interface {
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// Push pushes a task to the tail of this queue.
Push(c context.Context, task *model.Task) error
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// PushAtOnce pushes a task to the tail of this queue.
PushAtOnce(c context.Context, tasks []*model.Task) error
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// Poll retrieves and removes a task head of this queue.
Poll(c context.Context, agentID int64, f FilterFn) (*model.Task, error)
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// Extend extends the deadline for a task.
Extend(c context.Context, id string) error
// Done signals the task is complete.
Done(c context.Context, id string, exitStatus model.StatusValue) error
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// Error signals the task is complete with errors.
Error(c context.Context, id string, err error) error
// ErrorAtOnce signals the task is complete with errors.
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ErrorAtOnce(c context.Context, id []string, err error) error
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// Evict removes a pending task from the queue.
Evict(c context.Context, id string) error
// EvictAtOnce removes a pending task from the queue.
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EvictAtOnce(c context.Context, id []string) error
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// Wait waits until the task is complete.
Wait(c context.Context, id string) error
// Info returns internal queue information.
Info(c context.Context) InfoT
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// Pause stops the queue from handing out new work items in Poll
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Pause()
// Resume starts the queue again, Poll returns new items
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Resume()
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}