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134 lines
3.4 KiB
134 lines
3.4 KiB
// Copyright 2019 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package queue
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import (
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"context"
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"encoding/json"
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"fmt"
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"reflect"
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)
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// ErrInvalidConfiguration is called when there is invalid configuration for a queue
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type ErrInvalidConfiguration struct {
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cfg interface{}
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err error
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}
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func (err ErrInvalidConfiguration) Error() string {
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if err.err != nil {
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return fmt.Sprintf("Invalid Configuration Argument: %v: Error: %v", err.cfg, err.err)
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}
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return fmt.Sprintf("Invalid Configuration Argument: %v", err.cfg)
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}
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// IsErrInvalidConfiguration checks if an error is an ErrInvalidConfiguration
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func IsErrInvalidConfiguration(err error) bool {
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_, ok := err.(ErrInvalidConfiguration)
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return ok
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}
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// Type is a type of Queue
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type Type string
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// Data defines an type of queuable data
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type Data interface{}
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// HandlerFunc is a function that takes a variable amount of data and processes it
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type HandlerFunc func(...Data)
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// NewQueueFunc is a function that creates a queue
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type NewQueueFunc func(handler HandlerFunc, config interface{}, exemplar interface{}) (Queue, error)
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// Shutdownable represents a queue that can be shutdown
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type Shutdownable interface {
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Shutdown()
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Terminate()
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}
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// Named represents a queue with a name
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type Named interface {
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Name() string
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}
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// Queue defines an interface to save an issue indexer queue
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type Queue interface {
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Run(atShutdown, atTerminate func(context.Context, func()))
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Push(Data) error
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}
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// DummyQueueType is the type for the dummy queue
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const DummyQueueType Type = "dummy"
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// NewDummyQueue creates a new DummyQueue
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func NewDummyQueue(handler HandlerFunc, opts, exemplar interface{}) (Queue, error) {
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return &DummyQueue{}, nil
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}
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// DummyQueue represents an empty queue
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type DummyQueue struct {
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}
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// Run starts to run the queue
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func (b *DummyQueue) Run(_, _ func(context.Context, func())) {}
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// Push pushes data to the queue
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func (b *DummyQueue) Push(Data) error {
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return nil
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}
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func toConfig(exemplar, cfg interface{}) (interface{}, error) {
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if reflect.TypeOf(cfg).AssignableTo(reflect.TypeOf(exemplar)) {
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return cfg, nil
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}
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configBytes, ok := cfg.([]byte)
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if !ok {
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configStr, ok := cfg.(string)
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if !ok {
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return nil, ErrInvalidConfiguration{cfg: cfg}
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}
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configBytes = []byte(configStr)
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}
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newVal := reflect.New(reflect.TypeOf(exemplar))
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if err := json.Unmarshal(configBytes, newVal.Interface()); err != nil {
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return nil, ErrInvalidConfiguration{cfg: cfg, err: err}
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}
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return newVal.Elem().Interface(), nil
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}
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var queuesMap = map[Type]NewQueueFunc{DummyQueueType: NewDummyQueue}
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// RegisteredTypes provides the list of requested types of queues
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func RegisteredTypes() []Type {
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types := make([]Type, len(queuesMap))
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i := 0
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for key := range queuesMap {
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types[i] = key
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i++
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}
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return types
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}
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// RegisteredTypesAsString provides the list of requested types of queues
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func RegisteredTypesAsString() []string {
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types := make([]string, len(queuesMap))
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i := 0
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for key := range queuesMap {
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types[i] = string(key)
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i++
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}
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return types
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}
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// NewQueue takes a queue Type and HandlerFunc some options and possibly an exemplar and returns a Queue or an error
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func NewQueue(queueType Type, handlerFunc HandlerFunc, opts, exemplar interface{}) (Queue, error) {
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newFn, ok := queuesMap[queueType]
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if !ok {
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return nil, fmt.Errorf("Unsupported queue type: %v", queueType)
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}
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return newFn(handlerFunc, opts, exemplar)
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}
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