review corrections

internal/context/context.go

@@ -11,8 +11,6 @@ import (
 	"github.com/hibiken/asynq/internal/base"
 )
 
-type BaseContext func() context.Context
-
 // A taskMetadata holds task scoped data to put in context.
 type taskMetadata struct {
 	id         string
@@ -37,7 +35,7 @@ func New(base context.Context, msg *base.TaskMessage, deadline time.Time) (conte
 		retryCount: msg.Retried,
 		qname:      msg.Queue,
 	}
-	ctx := context.WithValue(context.Background(), metadataCtxKey, metadata)
+	ctx := context.WithValue(base, metadataCtxKey, metadata)
 	return context.WithDeadline(ctx, deadline)
 }
 

processor.go

@@ -26,8 +26,8 @@ type processor struct {
 	logger *log.Logger
 	broker base.Broker
 
-	handler       Handler
+	handler   Handler
-	baseContextFn asynqcontext.BaseContext
+	baseCtxFn BaseCtxFn
 
 	queueConfig map[string]int
 
@@ -72,7 +72,7 @@ type processor struct {
 type processorParams struct {
 	logger          *log.Logger
 	broker          base.Broker
-	baseCtxFn       asynqcontext.BaseContext
+	baseCtxFn       BaseCtxFn
 	retryDelayFunc  RetryDelayFunc
 	isFailureFunc   func(error) bool
 	syncCh          chan<- *syncRequest
@@ -96,7 +96,7 @@ func newProcessor(params processorParams) *processor {
 	return &processor{
 		logger:          params.logger,
 		broker:          params.broker,
-		baseContextFn:   params.baseCtxFn,
+		baseCtxFn:       params.baseCtxFn,
 		queueConfig:     queues,
 		orderedQueues:   orderedQueues,
 		retryDelayFunc:  params.retryDelayFunc,
@@ -193,7 +193,7 @@ func (p *processor) exec() {
 				<-p.sema // release token
 			}()
 
-			ctx, cancel := asynqcontext.New(p.baseContextFn(), msg, deadline)
+			ctx, cancel := asynqcontext.New(p.baseCtxFn(), msg, deadline)
 			p.cancelations.Add(msg.ID, cancel)
 			defer func() {
 				cancel()

server.go

@@ -97,10 +97,11 @@ type Config struct {
 	// to the number of CPUs usable by the current process.
 	Concurrency int
 
-	// BaseContext optionally specifies a function that returns
+	// BaseContext optionally specifies a function that returns the base context for Handler invocations on this server.
-	// the base context for invocations on this server.
+	//
 	// If BaseContext is nil, the default is context.Background().
-	BaseContext func() context.Context
+	// If this is defined, then it MUST return a non-nil context
+	BaseContext BaseCtxFn
 
 	// SleepOnEmptyQueue optionally specifies the amount of time to wait before polling again when there are no messages in the queue
 	SleepOnEmptyQueue time.Duration
@@ -211,6 +212,9 @@ func (fn ErrorHandlerFunc) HandleError(ctx context.Context, task *Task, err erro
 	fn(ctx, task, err)
 }
 
+// BaseCtxFn provides the root context from where the execution contexts of tasks are derived
+type BaseCtxFn func() context.Context
+
 // RetryDelayFunc calculates the retry delay duration for a failed task given
 // the retry count, error, and the task.
 //