fix(go1.15): require non-nil parent in context.WithValue

Author: sranka

Diff for: kv/organizations.go

@@ -154,6 +154,9 @@ func (s *organizationsStore) Delete(ctx context.Context, o *chronograf.Organizat
 
 	// Each of the associated organization stores expects organization to be
 	// set on the context.
+	if ctx == nil {
+		ctx = context.Background() // context could be possible nil before go 1.15, see https://github.com/golang/go/issues/40737
+	}
 	ctx = context.WithValue(ctx, organizations.ContextKey, o.ID)
 
 	sourcesStore := organizations.NewSourcesStore(s.client.SourcesStore(), o.ID)

Diff for: organizations/dashboards_test.go

@@ -78,6 +78,9 @@ func TestDashboards_All(t *testing.T) {
 	}
 	for _, tt := range tests {
 		s := organizations.NewDashboardsStore(tt.fields.DashboardsStore, tt.args.organization)
+		if tt.args.ctx == nil {
+			tt.args.ctx = context.Background() // required since go 1.15, see https://github.com/golang/go/issues/40737
+		}
 		tt.args.ctx = context.WithValue(tt.args.ctx, organizations.ContextKey, tt.args.organization)
 		gots, err := s.All(tt.args.ctx)
 		if (err != nil) != tt.wantErr {

Diff for: organizations/organizations_test.go

@@ -94,6 +94,9 @@ func TestOrganizations_All(t *testing.T) {
 	}
 	for _, tt := range tests {
 		s := organizations.NewOrganizationsStore(tt.fields.OrganizationsStore, tt.args.organization)
+		if tt.args.ctx == nil {
+			tt.args.ctx = context.Background() // required since go 1.15, see https://github.com/golang/go/issues/40737
+		}
 		tt.args.ctx = context.WithValue(tt.args.ctx, organizations.ContextKey, tt.args.organization)
 		gots, err := s.All(tt.args.ctx)
 		if (err != nil) != tt.wantErr {

Diff for: organizations/servers_test.go

@@ -79,6 +79,9 @@ func TestServers_All(t *testing.T) {
 	}
 	for _, tt := range tests {
 		s := organizations.NewServersStore(tt.fields.ServersStore, tt.args.organization)
+		if tt.args.ctx == nil {
+			tt.args.ctx = context.Background() // required since go 1.15, see https://github.com/golang/go/issues/40737
+		}
 		tt.args.ctx = context.WithValue(tt.args.ctx, organizations.ContextKey, tt.args.organization)
 		gots, err := s.All(tt.args.ctx)
 		if (err != nil) != tt.wantErr {

Diff for: organizations/sources_test.go

@@ -79,6 +79,9 @@ func TestSources_All(t *testing.T) {
 	}
 	for _, tt := range tests {
 		s := organizations.NewSourcesStore(tt.fields.SourcesStore, tt.args.organization)
+		if tt.args.ctx == nil {
+			tt.args.ctx = context.Background() // required since go 1.15, see https://github.com/golang/go/issues/40737
+		}
 		tt.args.ctx = context.WithValue(tt.args.ctx, organizations.ContextKey, tt.args.organization)
 		gots, err := s.All(tt.args.ctx)
 		if (err != nil) != tt.wantErr {

Diff for: server/context.go

@@ -26,5 +26,8 @@ func hasServerContext(ctx context.Context) bool {
 }
 
 func serverContext(ctx context.Context) context.Context {
+	if ctx == nil {
+		ctx = context.Background() // context could be possible nil before go 1.15, see https://github.com/golang/go/issues/40737
+	}
 	return context.WithValue(ctx, ServerContextKey, true)
 }

Diff for: server/sources_test.go

@@ -8,6 +8,7 @@ import (
 	"net/http"
 	"net/http/httptest"
 	"reflect"
+	"strings"
 	"testing"
 
 	"github.com/bouk/httprouter"
@@ -135,7 +136,7 @@ func Test_ValidSourceRequest(t *testing.T) {
 				},
 			},
 			wants: wants{
-				err: fmt.Errorf("invalid source URI: parse im a bad url: invalid URI for request"),
+				err: fmt.Errorf("invalid source URI: parse"), // im a bad url: invalid URI for request
 			},
 		},
 	}
@@ -150,6 +151,12 @@ func Test_ValidSourceRequest(t *testing.T) {
 				return
 			}
 			if err.Error() != tt.wants.err.Error() {
+				if err != nil && tt.wants.err != nil {
+					if strings.HasPrefix(err.Error(), tt.wants.err.Error()) {
+						// error messages vary between go versions, but they have the same prefixes
+						return
+					}
+				}
 				t.Errorf("%q. ValidSourceRequest() = %q, want %q", tt.name, err, tt.wants.err)
 			}
 		})