Adding nil guards to the wait operations (#2936)

<!-- This change is generated by MagicModules. -->
/cc @chrisst

google/appengine_operation.go

@@ -18,6 +18,9 @@ type AppEngineOperationWaiter struct {
 }
 
 func (w *AppEngineOperationWaiter) QueryOp() (interface{}, error) {
+	if w == nil {
+		return nil, fmt.Errorf("Cannot query operation, it's unset or nil.")
+	}
 	matches := appEngineOperationIdRegexp.FindStringSubmatch(w.Op.Name)
 	if len(matches) != 2 {
 		return nil, fmt.Errorf("Expected %d results of parsing operation name, got %d from %s", 2, len(matches), w.Op.Name)

google/cloudfunctions_operation.go

@@ -1,6 +1,8 @@
 package google
 
 import (
+	"fmt"
+
 	"google.golang.org/api/cloudfunctions/v1"
 )
 
@@ -10,6 +12,9 @@ type CloudFunctionsOperationWaiter struct {
 }
 
 func (w *CloudFunctionsOperationWaiter) QueryOp() (interface{}, error) {
+	if w == nil {
+		return nil, fmt.Errorf("Cannot query operation, it's unset or nil.")
+	}
 	return w.Service.Operations.Get(w.Op.Name).Do()
 }
 

google/common_operation.go

@@ -50,7 +50,7 @@ func (w *CommonOperationWaiter) State() string {
 }
 
 func (w *CommonOperationWaiter) Error() error {
-	if w.Op.Error != nil {
+	if w != nil && w.Op.Error != nil {
 		return fmt.Errorf("Error code %v, message: %s", w.Op.Error.Code, w.Op.Error.Message)
 	}
 	return nil

google/composer_operation.go

@@ -1,6 +1,8 @@
 package google
 
 import (
+	"fmt"
+
 	composer "google.golang.org/api/composer/v1beta1"
 )
 
@@ -10,6 +12,9 @@ type ComposerOperationWaiter struct {
 }
 
 func (w *ComposerOperationWaiter) QueryOp() (interface{}, error) {
+	if w == nil {
+		return nil, fmt.Errorf("Cannot query operation, it's unset or nil.")
+	}
 	return w.Service.Operations.Get(w.Op.Name).Do()
 }
 

google/compute_operation.go

@@ -16,7 +16,7 @@ type ComputeOperationWaiter struct {
 
 func (w *ComputeOperationWaiter) State() string {
 	if w == nil || w.Op == nil {
-		return fmt.Sprintf("Operation is nil!")
+		return "<nil>"
 	}
 
 	return w.Op.Status
@@ -39,6 +39,9 @@ func (w *ComputeOperationWaiter) SetOp(op interface{}) error {
 }
 
 func (w *ComputeOperationWaiter) QueryOp() (interface{}, error) {
+	if w == nil || w.Op == nil {
+		return nil, fmt.Errorf("Cannot query operation, it's unset or nil.")
+	}
 	if w.Op.Zone != "" {
 		zone := GetResourceNameFromSelfLink(w.Op.Zone)
 		return w.Service.ZoneOperations.Get(w.Project, zone, w.Op.Name).Do()

google/container_operation.go

@@ -3,7 +3,7 @@ package google
 import (
 	"fmt"
 
-	"google.golang.org/api/container/v1beta1"
+	container "google.golang.org/api/container/v1beta1"
 )
 
 type ContainerOperationWaiter struct {
@@ -14,28 +14,41 @@ type ContainerOperationWaiter struct {
 }
 
 func (w *ContainerOperationWaiter) State() string {
+	if w == nil || w.Op == nil {
+		return "<nil>"
+	}
 	return w.Op.Status
 }
 
 func (w *ContainerOperationWaiter) Error() error {
-	if w.Op.StatusMessage != "" {
+	if w != nil && w.Op != nil {
 		return fmt.Errorf(w.Op.StatusMessage)
 	}
 	return nil
 }
 
 func (w *ContainerOperationWaiter) SetOp(op interface{}) error {
-	w.Op = op.(*container.Operation)
+	var ok bool
+	w.Op, ok = op.(*container.Operation)
+	if !ok {
+		return fmt.Errorf("Unable to set operation. Bad type!")
+	}
 	return nil
 }
 
 func (w *ContainerOperationWaiter) QueryOp() (interface{}, error) {
+	if w == nil || w.Op == nil {
+		return nil, fmt.Errorf("Cannot query operation, it's unset or nil.")
+	}
 	name := fmt.Sprintf("projects/%s/locations/%s/operations/%s",
 		w.Project, w.Location, w.Op.Name)
 	return w.Service.Projects.Locations.Operations.Get(name).Do()
 }
 
 func (w *ContainerOperationWaiter) OpName() string {
+	if w == nil || w.Op == nil {
+		return "<nil>"
+	}
 	return w.Op.Name
 }
 

google/dataproc_cluster_operation.go

@@ -1,6 +1,8 @@
 package google
 
 import (
+	"fmt"
+
 	"google.golang.org/api/dataproc/v1"
 )
 
@@ -10,6 +12,9 @@ type DataprocClusterOperationWaiter struct {
 }
 
 func (w *DataprocClusterOperationWaiter) QueryOp() (interface{}, error) {
+	if w == nil {
+		return nil, fmt.Errorf("Cannot query operation, it's unset or nil.")
+	}
 	return w.Service.Projects.Regions.Operations.Get(w.Op.Name).Do()
 }
 

google/dataproc_job_operation.go

@@ -1,6 +1,7 @@
 package google
 
 import (
+	"fmt"
 	"net/http"
 
 	"google.golang.org/api/dataproc/v1"
@@ -15,6 +16,9 @@ type DataprocJobOperationWaiter struct {
 }
 
 func (w *DataprocJobOperationWaiter) State() string {
+	if w == nil {
+		return "<nil>"
+	}
 	return w.Status
 }
 
@@ -32,6 +36,9 @@ func (w *DataprocJobOperationWaiter) SetOp(job interface{}) error {
 }
 
 func (w *DataprocJobOperationWaiter) QueryOp() (interface{}, error) {
+	if w == nil {
+		return nil, fmt.Errorf("Cannot query operation, it's unset or nil.")
+	}
 	job, err := w.Service.Projects.Regions.Jobs.Get(w.ProjectId, w.Region, w.JobId).Do()
 	if job != nil {
 		w.Status = job.Status.State
@@ -40,6 +47,9 @@ func (w *DataprocJobOperationWaiter) QueryOp() (interface{}, error) {
 }
 
 func (w *DataprocJobOperationWaiter) OpName() string {
+	if w == nil {
+		return "<nil>"
+	}
 	return w.JobId
 }
 
@@ -74,6 +84,9 @@ func (w *DataprocDeleteJobOperationWaiter) TargetStates() []string {
 }
 
 func (w *DataprocDeleteJobOperationWaiter) QueryOp() (interface{}, error) {
+	if w == nil {
+		return nil, fmt.Errorf("Cannot query operation, it's unset or nil.")
+	}
 	job, err := w.Service.Projects.Regions.Jobs.Get(w.ProjectId, w.Region, w.JobId).Do()
 	if err != nil {
 		if isGoogleApiErrorWithCode(err, http.StatusNotFound) {

google/redis_operation.go

@@ -1,7 +1,9 @@
 package google
 
 import (
-	"google.golang.org/api/redis/v1beta1"
+	"fmt"
+
+	redis "google.golang.org/api/redis/v1beta1"
 )
 
 type RedisOperationWaiter struct {
@@ -10,6 +12,9 @@ type RedisOperationWaiter struct {
 }
 
 func (w *RedisOperationWaiter) QueryOp() (interface{}, error) {
+	if w == nil {
+		return nil, fmt.Errorf("Cannot query operation, it's unset or nil.")
+	}
 	return w.Service.Operations.Get(w.Op.Name).Do()
 }
 

google/resourcemanager_operation.go

@@ -1,6 +1,8 @@
 package google
 
 import (
+	"fmt"
+
 	"google.golang.org/api/cloudresourcemanager/v1"
 	resourceManagerV2Beta1 "google.golang.org/api/cloudresourcemanager/v2beta1"
 )
@@ -11,6 +13,9 @@ type ResourceManagerOperationWaiter struct {
 }
 
 func (w *ResourceManagerOperationWaiter) QueryOp() (interface{}, error) {
+	if w == nil {
+		return nil, fmt.Errorf("Cannot query operation, it's unset or nil.")
+	}
 	return w.Service.Operations.Get(w.Op.Name).Do()
 }
 

google/serviceman_operation.go

@@ -1,6 +1,8 @@
 package google
 
 import (
+	"fmt"
+
 	"google.golang.org/api/googleapi"
 	"google.golang.org/api/servicemanagement/v1"
 )
@@ -11,6 +13,9 @@ type ServiceManagementOperationWaiter struct {
 }
 
 func (w *ServiceManagementOperationWaiter) QueryOp() (interface{}, error) {
+	if w == nil {
+		return nil, fmt.Errorf("Cannot query operation, it's unset or nil.")
+	}
 	return w.Service.Operations.Get(w.Op.Name).Do()
 }
 

google/serviceusage_operation.go

@@ -1,7 +1,9 @@
 package google
 
 import (
-	"google.golang.org/api/serviceusage/v1beta1"
+	"fmt"
+
+	serviceusage "google.golang.org/api/serviceusage/v1beta1"
 )
 
 type ServiceUsageOperationWaiter struct {
@@ -10,6 +12,9 @@ type ServiceUsageOperationWaiter struct {
 }
 
 func (w *ServiceUsageOperationWaiter) QueryOp() (interface{}, error) {
+	if w == nil {
+		return nil, fmt.Errorf("Cannot query operation, it's unset or nil.")
+	}
 	return w.Service.Operations.Get(w.Op.Name).Do()
 }
 

google/spanner_instance_operation.go

@@ -1,6 +1,8 @@
 package google
 
 import (
+	"fmt"
+
 	"google.golang.org/api/spanner/v1"
 )
 
@@ -10,6 +12,9 @@ type SpannerInstanceOperationWaiter struct {
 }
 
 func (w *SpannerInstanceOperationWaiter) QueryOp() (interface{}, error) {
+	if w == nil {
+		return nil, fmt.Errorf("Cannot query operation, it's unset or nil.")
+	}
 	return w.Service.Projects.Instances.Operations.Get(w.Op.Name).Do()
 }
 

google/sqladmin_operation.go

@@ -2,8 +2,9 @@ package google
 
 import (
 	"bytes"
+	"fmt"
 
-	"google.golang.org/api/sqladmin/v1beta4"
+	sqladmin "google.golang.org/api/sqladmin/v1beta4"
 )
 
 type SqlAdminOperationWaiter struct {
@@ -13,26 +14,44 @@ type SqlAdminOperationWaiter struct {
 }
 
 func (w *SqlAdminOperationWaiter) State() string {
+	if w == nil || w.Op == nil {
+		return "Operation is nil!"
+	}
+
 	return w.Op.Status
 }
 
 func (w *SqlAdminOperationWaiter) Error() error {
-	if w.Op.Error != nil {
+	if w != nil && w.Op != nil && w.Op.Error != nil {
 		return SqlAdminOperationError(*w.Op.Error)
 	}
 	return nil
 }
 
 func (w *SqlAdminOperationWaiter) SetOp(op interface{}) error {
-	w.Op = op.(*sqladmin.Operation)
+	var ok bool
+	w.Op, ok = op.(*sqladmin.Operation)
+	if !ok {
+		return fmt.Errorf("Unable to set operation. Bad type!")
+	}
+
 	return nil
 }
 
 func (w *SqlAdminOperationWaiter) QueryOp() (interface{}, error) {
+	if w == nil || w.Op == nil {
+		return nil, fmt.Errorf("Cannot query operation, it's unset or nil.")
+	}
+	if w.Service == nil {
+		return nil, fmt.Errorf("Cannot query operation, service is nil.")
+	}
 	return w.Service.Operations.Get(w.Project, w.Op.Name).Do()
 }
 
 func (w *SqlAdminOperationWaiter) OpName() string {
+	if w == nil || w.Op == nil {
+		return "<nil>"
+	}
 	return w.Op.Name
 }