Add queue details UI for admins (#1632)

# Changes
- Adds an admin view to see the whole work-queue of the server. 
- The admin can also pause / resume the queue. 
- The view is reloading data every 5 seconds automatically.
- The task model from queue got removed in favor of the one from models.

server/queue/queue.go

@@ -3,7 +3,6 @@ package queue
 import (
 	"context"
 	"errors"
-	"fmt"
 	"strings"
 
 	"github.com/woodpecker-ci/woodpecker/server/model"
@@ -17,87 +16,11 @@ var (
 	ErrNotFound = errors.New("queue: task not found")
 )
 
-// Task defines a unit of work in the queue.
-type Task struct {
-	// ID identifies this task.
-	ID string `json:"id,omitempty"`
-
-	// Data is the actual data in the entry.
-	Data []byte `json:"data"`
-
-	// Labels represents the key-value pairs the entry is labeled with.
-	Labels map[string]string `json:"labels,omitempty"`
-
-	// Task IDs this task depend
-	Dependencies []string
-
-	// Dependency's exit status
-	DepStatus map[string]string
-
-	// RunOn failure or success
-	RunOn []string
-}
-
-// ShouldRun tells if a task should be run or skipped, based on dependencies
-func (t *Task) ShouldRun() bool {
-	if runsOnFailure(t.RunOn) && runsOnSuccess(t.RunOn) {
-		return true
-	}
-
-	if !runsOnFailure(t.RunOn) && runsOnSuccess(t.RunOn) {
-		for _, status := range t.DepStatus {
-			if StatusSuccess != status {
-				return false
-			}
-		}
-		return true
-	}
-
-	if runsOnFailure(t.RunOn) && !runsOnSuccess(t.RunOn) {
-		for _, status := range t.DepStatus {
-			if StatusSuccess == status {
-				return false
-			}
-		}
-		return true
-	}
-
-	return false
-}
-
-func (t *Task) String() string {
-	var sb strings.Builder
-	sb.WriteString(fmt.Sprintf("%s (%s) - %s", t.ID, t.Dependencies, t.DepStatus))
-	return sb.String()
-}
-
-func runsOnFailure(runsOn []string) bool {
-	for _, status := range runsOn {
-		if status == "failure" {
-			return true
-		}
-	}
-	return false
-}
-
-func runsOnSuccess(runsOn []string) bool {
-	if len(runsOn) == 0 {
-		return true
-	}
-
-	for _, status := range runsOn {
-		if status == "success" {
-			return true
-		}
-	}
-	return false
-}
-
 // InfoT provides runtime information.
 type InfoT struct {
-	Pending       []*Task `json:"pending"`
-	WaitingOnDeps []*Task `json:"waiting_on_deps"`
-	Running       []*Task `json:"running"`
+	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"`
@@ -105,7 +28,7 @@ type InfoT struct {
 		Running       int `json:"running_count"`
 		Complete      int `json:"completed_count"`
 	} `json:"stats"`
-	Paused bool
+	Paused bool `json:"paused"`
 }
 
 func (t *InfoT) String() string {
@@ -128,19 +51,19 @@ func (t *InfoT) String() string {
 
 // Filter filters tasks in the queue. If the Filter returns false,
 // the Task is skipped and not returned to the subscriber.
-type FilterFn func(*Task) bool
+type FilterFn func(*model.Task) bool
 
 // Queue defines a task queue for scheduling tasks among
 // a pool of workers.
 type Queue interface {
 	// Push pushes a task to the tail of this queue.
-	Push(c context.Context, task *Task) error
+	Push(c context.Context, task *model.Task) error
 
 	// PushAtOnce pushes a task to the tail of this queue.
-	PushAtOnce(c context.Context, tasks []*Task) error
+	PushAtOnce(c context.Context, tasks []*model.Task) error
 
 	// Poll retrieves and removes a task head of this queue.
-	Poll(c context.Context, f FilterFn) (*Task, error)
+	Poll(c context.Context, f FilterFn) (*model.Task, error)
 
 	// Extend extends the deadline for a task.
 	Extend(c context.Context, id string) error