TUN-7813: Improve tunnel delete command to use cascade delete

## Summary
Previously the force flag in the tunnel delete command was only explicitly deleting the
connections of a tunnel. Therefore, we are changing it to use the cascade query parameter
supported by the API. That parameter will delegate to the server the deletion of the tunnel
dependencies implicitly instead of the client doing it explicitly. This means that not only
the connections will get deleted, but also the tunnel routes, ensuring that no dependencies
are left without a non-deleted tunnel.

cfapi/client.go

@@ -9,7 +9,7 @@ type TunnelClient interface {
 	GetTunnel(tunnelID uuid.UUID) (*Tunnel, error)
 	GetTunnelToken(tunnelID uuid.UUID) (string, error)
 	GetManagementToken(tunnelID uuid.UUID) (string, error)
-	DeleteTunnel(tunnelID uuid.UUID) error
+	DeleteTunnel(tunnelID uuid.UUID, cascade bool) error
 	ListTunnels(filter *TunnelFilter) ([]*Tunnel, error)
 	ListActiveClients(tunnelID uuid.UUID) ([]*ActiveClient, error)
 	CleanupConnections(tunnelID uuid.UUID, params *CleanupParams) error

cfapi/tunnel.go

@@ -159,9 +159,14 @@ func (r *RESTClient) GetManagementToken(tunnelID uuid.UUID) (token string, err e
 	return "", r.statusCodeToError("get tunnel token", resp)
 }
 
-func (r *RESTClient) DeleteTunnel(tunnelID uuid.UUID) error {
+func (r *RESTClient) DeleteTunnel(tunnelID uuid.UUID, cascade bool) error {
 	endpoint := r.baseEndpoints.accountLevel
 	endpoint.Path = path.Join(endpoint.Path, fmt.Sprintf("%v", tunnelID))
+	// Cascade will delete all tunnel dependencies (connections, routes, etc.) that
+	// are linked to the deleted tunnel.
+	if cascade {
+		endpoint.RawQuery = "cascade=true"
+	}
 	resp, err := r.sendRequest("DELETE", endpoint, nil)
 	if err != nil {
 		return errors.Wrap(err, "REST request failed")

cmd/cloudflared/tunnel/subcommand_context.go

@@ -156,7 +156,7 @@ func (sc *subcommandContext) create(name string, credentialsFilePath string, sec
 		var errorLines []string
 		errorLines = append(errorLines, fmt.Sprintf("Your tunnel '%v' was created with ID %v. However, cloudflared couldn't write tunnel credentials to %s.", tunnel.Name, tunnel.ID, credentialsFilePath))
 		errorLines = append(errorLines, fmt.Sprintf("The file-writing error is: %v", writeFileErr))
-		if deleteErr := client.DeleteTunnel(tunnel.ID); deleteErr != nil {
+		if deleteErr := client.DeleteTunnel(tunnel.ID, true); deleteErr != nil {
 			errorLines = append(errorLines, fmt.Sprintf("Cloudflared tried to delete the tunnel for you, but encountered an error. You should use `cloudflared tunnel delete %v` to delete the tunnel yourself, because the tunnel can't be run without the tunnelfile.", tunnel.ID))
 			errorLines = append(errorLines, fmt.Sprintf("The delete tunnel error is: %v", deleteErr))
 		} else {
@@ -206,13 +206,8 @@ func (sc *subcommandContext) delete(tunnelIDs []uuid.UUID) error {
 		if !tunnel.DeletedAt.IsZero() {
 			return fmt.Errorf("Tunnel %s has already been deleted", tunnel.ID)
 		}
-		if forceFlagSet {
-			if err := client.CleanupConnections(tunnel.ID, cfapi.NewCleanupParams()); err != nil {
-				return errors.Wrapf(err, "Error cleaning up connections for tunnel %s", tunnel.ID)
-			}
-		}
 
-		if err := client.DeleteTunnel(tunnel.ID); err != nil {
+		if err := client.DeleteTunnel(tunnel.ID, forceFlagSet); err != nil {
 			return errors.Wrapf(err, "Error deleting tunnel %s", tunnel.ID)
 		}
 

cmd/cloudflared/tunnel/subcommand_context_test.go

@@ -219,7 +219,7 @@ func (d *deleteMockTunnelStore) GetTunnelToken(tunnelID uuid.UUID) (string, erro
 	return "token", nil
 }
 
-func (d *deleteMockTunnelStore) DeleteTunnel(tunnelID uuid.UUID) error {
+func (d *deleteMockTunnelStore) DeleteTunnel(tunnelID uuid.UUID, cascade bool) error {
 	tunnel, ok := d.mockTunnels[tunnelID]
 	if !ok {
 		return fmt.Errorf("Couldn't find tunnel: %v", tunnelID)

cmd/cloudflared/tunnel/subcommands.go

@@ -119,8 +119,8 @@ var (
 	forceDeleteFlag = &cli.BoolFlag{
 		Name:    "force",
 		Aliases: []string{"f"},
-		Usage: "Cleans up any stale connections before the tunnel is deleted. cloudflared will not " +
+		Usage: "Deletes a tunnel even if tunnel is connected and it has dependencies associated to it. (eg. IP routes)." +
-			"delete a tunnel with connections without this flag.",
+			" It is not possible to delete tunnels that have connections or non-deleted dependencies, without this flag.",
 		EnvVars: []string{"TUNNEL_RUN_FORCE_OVERWRITE"},
 	}
 	selectProtocolFlag = altsrc.NewStringFlag(&cli.StringFlag{