Add ResultWriter type

asynq.go

@@ -454,3 +454,22 @@ func parseRedisSentinelURI(u *url.URL) (RedisConnOpt, error) {
 	}
 	return RedisFailoverClientOpt{MasterName: master, SentinelAddrs: addrs, Password: password}, nil
 }
+
+// ResultWriter is a client interface to write result data for a task.
+// ResultWriter instance should be retrieved by calling GetResultWriter function with the context
+// passed to Handler.
+type ResultWriter struct {
+	id     string // task ID this writer is responsible for
+	qname  string // queue name the task belongs to
+	broker base.Broker
+}
+
+// Write writes the given data as a result of the task the ResultWriter is associated with.
+func (w *ResultWriter) Write(data []byte) (n int, err error) {
+	return w.broker.WriteResult(w.qname, w.id, data)
+}
+
+// TaskID returns the ID of the task the ResultWriter is associated with.
+func (w *ResultWriter) TaskID() string {
+	return w.id
+}

go.sum

@@ -1,22 +1,30 @@
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@@ -37,9 +45,11 @@ github.com/google/go-cmp v0.5.6 h1:BKbKCqvP6I+rmFHt06ZmyQtvB8xAkWdhFyr0ZUNZcxQ=
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@@ -55,25 +65,32 @@ github.com/onsi/gomega v1.10.5 h1:7n6FEkpFmfCoo2t+YYqXH0evK+a9ICQz0xcAy9dYcaQ=
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@@ -86,10 +103,12 @@ golang.org/x/net v0.0.0-20200520004742-59133d7f0dd7/go.mod h1:qpuaurCH72eLCgpAm/
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@@ -113,6 +132,7 @@ golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3
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@@ -120,12 +140,15 @@ golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8T
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@@ -140,6 +163,7 @@ google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlba
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@@ -149,4 +173,5 @@ gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
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 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc h1:/hemPrYIhOhy8zYrNj+069zDB68us2sMGsfkFJO0iZs=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

internal/base/base.go

@@ -676,5 +676,6 @@ type Broker interface {
 	ClearServerState(host string, pid int, serverID string) error
 	CancelationPubSub() (*redis.PubSub, error) // TODO: Need to decouple from redis to support other brokers
 	PublishCancelation(id string) error
+	WriteResult(qname, id string, data []byte) (n int, err error)
 	Close() error
 }

internal/context/context_test.go

@@ -12,9 +12,14 @@ import (
 	"github.com/google/go-cmp/cmp"
 	"github.com/google/uuid"
 	"github.com/hibiken/asynq/internal/base"
+	"github.com/hibiken/asynq/internal/rdb"
 )
 
 func TestCreateContextWithFutureDeadline(t *testing.T) {
+	r := setup(t)
+	defer r.Close()
+	rdbClient := rdb.NewRDB(r)
+
 	tests := []struct {
 		deadline time.Time
 	}{
@@ -28,7 +33,11 @@ func TestCreateContextWithFutureDeadline(t *testing.T) {
 			Payload: nil,
 		}
 
+<<<<<<< HEAD:internal/context/context_test.go
 		ctx, cancel := New(msg, tc.deadline)
+=======
+		ctx, cancel := createContext(msg, tc.deadline, rdbClient)
+>>>>>>> 59894e5... Add ResultWriter type:context_test.go
 
 		select {
 		case x := <-ctx.Done():
@@ -55,6 +64,10 @@ func TestCreateContextWithFutureDeadline(t *testing.T) {
 }
 
 func TestCreateContextWithPastDeadline(t *testing.T) {
+	r := setup(t)
+	defer r.Close()
+	rdbClient := rdb.NewRDB(r)
+
 	tests := []struct {
 		deadline time.Time
 	}{
@@ -68,7 +81,11 @@ func TestCreateContextWithPastDeadline(t *testing.T) {
 			Payload: nil,
 		}
 
+<<<<<<< HEAD:internal/context/context_test.go
 		ctx, cancel := New(msg, tc.deadline)
+=======
+		ctx, cancel := createContext(msg, tc.deadline, rdbClient)
+>>>>>>> 59894e5... Add ResultWriter type:context_test.go
 		defer cancel()
 
 		select {
@@ -87,7 +104,36 @@ func TestCreateContextWithPastDeadline(t *testing.T) {
 	}
 }
 
+func TestGetResultWriterFromContext(t *testing.T) {
+	r := setup(t)
+	defer r.Close()
+	rdbClient := rdb.NewRDB(r)
+	const deadline = time.Now().Add(30 * time.Minute)
+
+	tests := []struct {
+		msg *base.TaskMessage
+	}{
+		{msg: &base.TaskMessage{ID: uuid.NewString(), Type: "task1", Queue: "default"}},
+	}
+
+	for _, tc := range tests {
+		ctx, cancel := createContext(tc.msg, deadline, rdbClient)
+		defer cancel()
+
+		w, ok := GetResultWriter(ctx)
+		if !ok {
+			t.Error("GetResultWriter returned ok == false")
+		}
+
+		// TODO: Call Write and verify the result are written
+	}
+}
+
 func TestGetTaskMetadataFromContext(t *testing.T) {
+	r := setup(t)
+	defer r.Close()
+	rdbClient := rdb.NewRDB(r)
+
 	tests := []struct {
 		desc string
 		msg  *base.TaskMessage
@@ -98,7 +144,11 @@ func TestGetTaskMetadataFromContext(t *testing.T) {
 	}
 
 	for _, tc := range tests {
+<<<<<<< HEAD:internal/context/context_test.go
 		ctx, cancel := New(tc.msg, time.Now().Add(30*time.Minute))
+=======
+		ctx, cancel := createContext(tc.msg, time.Now().Add(30*time.Minute), rdbClient)
+>>>>>>> 59894e5... Add ResultWriter type:context_test.go
 		defer cancel()
 
 		id, ok := GetTaskID(ctx)

internal/rdb/rdb.go

@@ -1052,3 +1052,13 @@ func (r *RDB) ClearSchedulerHistory(entryID string) error {
 	}
 	return nil
 }
+
+// WriteResult writes the given result data for the specified task.
+func (r *RDB) WriteResult(qname, taskID string, data []byte) (int, error) {
+	var op errors.Op = "rdb.WriteResult"
+	taskKey := base.TaskKey(qname, taskID)
+	if err := r.client.HSet(context.Background(), taskKey, "result", data).Err(); err != nil {
+		return 0, errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "hset", Err: err})
+	}
+	return len(data), nil
+}

internal/rdb/rdb_test.go

@@ -2573,3 +2573,39 @@ func TestCancelationPubSub(t *testing.T) {
 	}
 	mu.Unlock()
 }
+
+func TestWriteResult(t *testing.T) {
+	r := setup(t)
+	defer r.Close()
+
+	tests := []struct {
+		qname  string
+		taskID string
+		data   []byte
+	}{
+		{
+			qname:  "default",
+			taskID: uuid.NewString(),
+			data:   []byte("hello"),
+		},
+	}
+
+	for _, tc := range tests {
+		h.FlushDB(t, r.client)
+
+		n, err := r.WriteResult(tc.qname, tc.taskID, tc.data)
+		if err != nil {
+			t.Errorf("WriteResult failed: %v", err)
+			continue
+		}
+		if n != len(tc.data) {
+			t.Errorf("WriteResult returned %d, want %d", n, len(tc.data))
+		}
+
+		taskKey := base.TaskKey(tc.qname, tc.taskID)
+		got := r.client.HGet(context.Background(), taskKey, "result").Val()
+		if got != string(tc.data) {
+			t.Errorf("`result` field under %q key is set to %q, want %q", taskKey, got, string(tc.data))
+		}
+	}
+}

internal/testbroker/testbroker.go

@@ -198,6 +198,15 @@ func (tb *TestBroker) PublishCancelation(id string) error {
 	return tb.real.PublishCancelation(id)
 }
 
+func (tb *TestBroker) WriteResult(qname, id string, data []byte) (int, error) {
+	tb.mu.Lock()
+	defer tb.mu.Unlock()
+	if tb.sleeping {
+		return 0, errRedisDown
+	}
+	return tb.real.WriteResult(qname, id, data)
+}
+
 func (tb *TestBroker) Ping() error {
 	tb.mu.Lock()
 	defer tb.mu.Unlock()