a little refactor (#112)

- reduce SLOC by using CallAsync method
- BucketForceCreate optimization: don't decode tnt response

CHANGELOG.md

@@ -21,6 +21,8 @@ FEATURES:
 REFACTOR:
 
 * Use constants for vshard error names and codes.
+* Reduce SLOC by using CallAsync method.
+* BucketForceCreate optimization: don't decode tnt response.
 
 TESTS:
 * Rename bootstrap_test.go -> tarantool_test.go and new test in this file.

replicaset.go

@@ -48,13 +48,7 @@ func (rs *Replicaset) BucketStat(ctx context.Context, bucketID uint64) (BucketSt
 func (rs *Replicaset) bucketStatAsync(ctx context.Context, bucketID uint64) *tarantool.Future {
 	const bucketStatFnc = "vshard.storage.bucket_stat"
 
-	req := tarantool.NewCallRequest(bucketStatFnc).
-		Args([]interface{}{bucketID}).
-		Context(ctx)
-
-	future := rs.conn.Do(req, pool.RO)
-
-	return future
+	return rs.CallAsync(ctx, ReplicasetCallOpts{PoolMode: pool.RO}, bucketStatFnc, []interface{}{bucketID})
 }
 
 func bucketStatWait(future *tarantool.Future) (BucketStatInfo, error) {
@@ -103,20 +97,11 @@ func (rs *Replicaset) ReplicaCall(
 	fnc string,
 	args interface{},
 ) (interface{}, StorageResultTypedFunc, error) {
-	timeout := CallTimeoutMin
-
-	if opts.Timeout > 0 {
-		timeout = opts.Timeout
+	if opts.Timeout == 0 {
+		opts.Timeout = CallTimeoutMin
 	}
 
-	ctx, cancel := context.WithTimeout(ctx, timeout)
-	defer cancel()
-
-	req := tarantool.NewCallRequest(fnc).
-		Context(ctx).
-		Args(args)
-
-	future := rs.conn.Do(req, opts.PoolMode)
+	future := rs.CallAsync(ctx, opts, fnc, args)
 
 	respData, err := future.Get()
 	if err != nil {
@@ -158,13 +143,8 @@ func (rs *Replicaset) bucketsDiscoveryAsync(ctx context.Context, from uint64) *t
 		From uint64 `msgpack:"from"`
 	}{From: from}
 
-	req := tarantool.NewCallRequest(bucketsDiscoveryFnc).
-		Context(ctx).
-		Args([]interface{}{&bucketsDiscoveryPaginationRequest})
-
-	future := rs.conn.Do(req, pool.PreferRO)
-
-	return future
+	return rs.CallAsync(ctx, ReplicasetCallOpts{PoolMode: pool.PreferRO}, bucketsDiscoveryFnc,
+		[]interface{}{bucketsDiscoveryPaginationRequest})
 }
 
 type bucketsDiscoveryResp struct {
@@ -279,28 +259,19 @@ func CalculateEtalonBalance(replicasets []Replicaset, bucketCount uint64) error
 func (rs *Replicaset) BucketsCount(ctx context.Context) (uint64, error) {
 	const bucketCountFnc = "vshard.storage.buckets_count"
 
-	req := tarantool.NewCallRequest(bucketCountFnc)
-	req = req.Context(ctx)
+	var bucketCount uint64
 
-	fut := rs.conn.Do(req, pool.ANY)
+	fut := rs.CallAsync(ctx, ReplicasetCallOpts{PoolMode: pool.ANY}, bucketCountFnc, nil)
+	err := fut.GetTyped(&[]interface{}{&bucketCount})
 
-	bucketCount := new(uint64)
-
-	err := fut.GetTyped(&[]interface{}{bucketCount})
-
-	return *bucketCount, err
+	return bucketCount, err
 }
 
 func (rs *Replicaset) BucketForceCreate(ctx context.Context, firstBucketID, count uint64) error {
-	const bucketCountFnc = "vshard.storage.bucket_force_create"
-
-	req := tarantool.NewCallRequest(bucketCountFnc)
-	req = req.Context(ctx)
-	req = req.Args(&[]interface{}{firstBucketID, count})
-
-	fut := rs.conn.Do(req, pool.RW)
+	const bucketForceCreateFnc = "vshard.storage.bucket_force_create"
 
-	_, err := fut.Get()
+	fut := rs.CallAsync(ctx, ReplicasetCallOpts{PoolMode: pool.RW}, bucketForceCreateFnc, []interface{}{firstBucketID, count})
+	_, err := fut.GetResponse()
 
 	return err
 }