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module "google_compute_route" {
  source       = "terraform-google-modules/network/google//modules/routes"
  version      = "~> 9.0"
  project_id   = var.project_id # Replace this with your project ID in quotes
  network_name = "default"

  routes = [
    {
      name              = "egress-internet"
      description       = "route through IGW to access internet"
      destination_range = "0.0.0.0/0"
      tags              = "egress-inet"
      next_hop_internet = "true"
    }
  ]
}

import (
	"context"
	"fmt"
	"io"

	compute "cloud.google.com/go/compute/apiv1"
	computepb "cloud.google.com/go/compute/apiv1/computepb"
	"google.golang.org/protobuf/proto"
)

// createRoute creates a route with given name inside given project.
func createRoute(w io.Writer, projectID, name string) error {
	// projectID := "your_project_id"
	// name := "testname"

	ctx := context.Background()
	client, err := compute.NewRoutesRESTClient(ctx)
	if err != nil {
		return fmt.Errorf("NewRoutesRESTClient: %w", err)
	}
	defer client.Close()

	route := &computepb.Route{
		Name:           proto.String(name),
		Network:        proto.String("global/networks/default"),
		DestRange:      proto.String("0.0.0.0/0"),
		NextHopGateway: proto.String("global/gateways/default-internet-gateway"),
	}

	req := &computepb.InsertRouteRequest{
		Project:       projectID,
		RouteResource: route,
	}
	op, err := client.Insert(ctx, req)

	if err != nil {
		return fmt.Errorf("unable to insert a route: %w", err)
	}

	if err := op.Wait(ctx); err != nil {
		return fmt.Errorf("unable to wait for the operation: %w", err)
	}

	fmt.Fprintf(w, "Route created\n")

	return nil
}

import com.google.cloud.compute.v1.InsertRouteRequest;
import com.google.cloud.compute.v1.Operation;
import com.google.cloud.compute.v1.Route;
import com.google.cloud.compute.v1.RoutesClient;
import java.io.IOException;
import java.util.UUID;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

public class CreateRoute {

  public static void main(String[] args)
          throws IOException, ExecutionException, InterruptedException, TimeoutException {
    // TODO(developer): Replace these variables before running the sample.
    // Project ID or project number of the Cloud project you want to use.
    String projectId = "your-project-id";
    // Route name you want to use.
    String routeName = "your-route-name";
    createRoute(projectId, routeName);
  }

  // Create route for a project.
  public static Operation.Status createRoute(String projectId, String routeName)
          throws IOException, ExecutionException, InterruptedException, TimeoutException {
    // Initialize client that will be used to send requests. This client only needs to be created
    // once, and can be reused for multiple requests.
    try (RoutesClient routesClient = RoutesClient.create()) {
      String nextHopGateway =
              String.format("projects/%s/global/gateways/default-internet-gateway", projectId);

      Route route = Route.newBuilder()
              .setName(routeName)
              .setDestRange("10.0.0.0/16")
              .setNetwork("global/networks/default")
              .setNextHopGateway(nextHopGateway)
              .build();

      InsertRouteRequest request = InsertRouteRequest.newBuilder()
              .setProject(projectId)
              .setRequestId(UUID.randomUUID().toString())
              .setRouteResource(route)
              .build();

      return routesClient.insertCallable().futureCall(request)
              .get(30, TimeUnit.SECONDS).getStatus();
    }
  }
}

from __future__ import annotations

import sys
from typing import Any

from google.api_core.extended_operation import ExtendedOperation
from google.cloud import compute_v1


def wait_for_extended_operation(
    operation: ExtendedOperation, verbose_name: str = "operation", timeout: int = 300
) -> Any:
    """
    Waits for the extended (long-running) operation to complete.

    If the operation is successful, it will return its result.
    If the operation ends with an error, an exception will be raised.
    If there were any warnings during the execution of the operation
    they will be printed to sys.stderr.

    Args:
        operation: a long-running operation you want to wait on.
        verbose_name: (optional) a more verbose name of the operation,
            used only during error and warning reporting.
        timeout: how long (in seconds) to wait for operation to finish.
            If None, wait indefinitely.

    Returns:
        Whatever the operation.result() returns.

    Raises:
        This method will raise the exception received from `operation.exception()`
        or RuntimeError if there is no exception set, but there is an `error_code`
        set for the `operation`.

        In case of an operation taking longer than `timeout` seconds to complete,
        a `concurrent.futures.TimeoutError` will be raised.
    """
    result = operation.result(timeout=timeout)

    if operation.error_code:
        print(
            f"Error during {verbose_name}: [Code: {operation.error_code}]: {operation.error_message}",
            file=sys.stderr,
            flush=True,
        )
        print(f"Operation ID: {operation.name}", file=sys.stderr, flush=True)
        raise operation.exception() or RuntimeError(operation.error_message)

    if operation.warnings:
        print(f"Warnings during {verbose_name}:\n", file=sys.stderr, flush=True)
        for warning in operation.warnings:
            print(f" - {warning.code}: {warning.message}", file=sys.stderr, flush=True)

    return result


def create_route(
    project_id: str,
    network: str,
    route_name: str,
    destination_range: str,
    *,
    next_hop_gateway: str | None = None,
    next_hop_ip: str | None = None,
    next_hop_instance: str | None = None,
    next_hop_vpn_tunnel: str | None = None,
    next_hop_ilb: str | None = None,
) -> compute_v1.Route:
    """
    Create a new route in selected network by providing a destination and next hop name.

    Note: The set of {next_hop_gateway, next_hop_ip, next_hop_instance, next_hop_vpn_tunnel,
        next_hop_ilb} is exclusive, you and only specify one of those parameters.

    Args:
        project_id: project ID or project number of the Cloud project you want to use.
        network: name of the network the route will be created in. Available name formats:
            * https://www.googleapis.com/compute/v1/projects/{project_id}/global/networks/{network}
            * projects/{project_id}/global/networks/{network}
            * global/networks/{network}
        route_name: name of the new route.
        destination_range: range of destination IPs this route should be applied to. E.g. 10.0.0.0/16.
        next_hop_gateway: name of the gateway the traffic should be directed to.
        next_hop_ip: IP address the traffic should be directed to.
        next_hop_instance: name of the instance the traffic should be directed to. Name format:
            "projects/{project}/zones/{zone}/instances/{instance_name}"
        next_hop_vpn_tunnel: name of the VPN tunnel the traffic should be directed to. Name format:
            "projects/{project}/regions/{region}/vpnTunnels/{vpn_tunnel_name}"
        next_hop_ilb: name of a forwarding rule of the Internal Load Balancer the traffic
            should be directed to. Name format:
            "projects/{project}/regions/{region}/forwardingRules/{forwarding_rule_region}"

    Returns:
        A new compute_v1.Route object.
    """
    excl_args = {
        next_hop_instance,
        next_hop_ilb,
        next_hop_vpn_tunnel,
        next_hop_gateway,
        next_hop_ip,
    }
    args_set = sum(1 if arg is not None else 0 for arg in excl_args)

    if args_set != 1:
        raise RuntimeError("You must specify exactly one next_hop_* parameter.")

    route = compute_v1.Route()
    route.name = route_name
    route.network = network
    route.dest_range = destination_range

    if next_hop_gateway:
        route.next_hop_gateway = next_hop_gateway
    elif next_hop_ip:
        route.next_hop_ip = next_hop_ip
    elif next_hop_instance:
        route.next_hop_instance = next_hop_instance
    elif next_hop_vpn_tunnel:
        route.next_hop_vpn_tunnel = next_hop_vpn_tunnel
    elif next_hop_ilb:
        route.next_hop_ilb = next_hop_ilb

    route_client = compute_v1.RoutesClient()
    operation = route_client.insert(project=project_id, route_resource=route)

    wait_for_extended_operation(operation, "route creation")

    return route_client.get(project=project_id, route=route_name)

import (
	"context"
	"fmt"
	"io"

	compute "cloud.google.com/go/compute/apiv1"
	computepb "cloud.google.com/go/compute/apiv1/computepb"
)

// deleteRoute deletes a route by name in given project.
func deleteRoute(w io.Writer, projectID, name string) error {
	// projectID := "your_project_id"
	// name := "testname"

	ctx := context.Background()
	client, err := compute.NewRoutesRESTClient(ctx)
	if err != nil {
		return fmt.Errorf("NewRoutesRESTClient: %w", err)
	}
	defer client.Close()

	req := &computepb.DeleteRouteRequest{
		Project: projectID,
		Route:   name,
	}
	op, err := client.Delete(ctx, req)

	if err != nil {
		return fmt.Errorf("unable to delete a route: %w", err)
	}

	if err := op.Wait(ctx); err != nil {
		return fmt.Errorf("unable to wait for the operation: %w", err)
	}

	fmt.Fprintf(w, "Route deleted\n")

	return nil
}

import com.google.cloud.compute.v1.DeleteRouteRequest;
import com.google.cloud.compute.v1.RoutesClient;
import java.io.IOException;
import java.util.UUID;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

public class DeleteRoute {

  public static void main(String[] args)
          throws IOException, ExecutionException, InterruptedException, TimeoutException {
    // TODO(developer): Replace these variables before running the sample.
    // Project ID or project number of the Cloud project you want to use.
    String projectId = "your-project-id";
    // Route name you want to delete.
    String routeName = "your-route-name";

    deleteRoute(projectId, routeName);
  }

  // Deletes a route from a project.
  public static void deleteRoute(String projectId, String routeName)
          throws IOException, ExecutionException, InterruptedException, TimeoutException {
    // Initialize client that will be used to send requests. This client only needs to be created
    // once, and can be reused for multiple requests.
    try (RoutesClient routesClient = RoutesClient.create()) {
      DeleteRouteRequest request = DeleteRouteRequest.newBuilder()
              .setProject(projectId)
              .setRoute(routeName)
              .setRequestId(UUID.randomUUID().toString())
              .build();
      routesClient.deleteCallable().futureCall(request).get(30, TimeUnit.SECONDS);
    }
  }
}

from __future__ import annotations

import sys
from typing import Any

from google.api_core.extended_operation import ExtendedOperation
from google.cloud import compute_v1


def wait_for_extended_operation(
    operation: ExtendedOperation, verbose_name: str = "operation", timeout: int = 300
) -> Any:
    """
    Waits for the extended (long-running) operation to complete.

    If the operation is successful, it will return its result.
    If the operation ends with an error, an exception will be raised.
    If there were any warnings during the execution of the operation
    they will be printed to sys.stderr.

    Args:
        operation: a long-running operation you want to wait on.
        verbose_name: (optional) a more verbose name of the operation,
            used only during error and warning reporting.
        timeout: how long (in seconds) to wait for operation to finish.
            If None, wait indefinitely.

    Returns:
        Whatever the operation.result() returns.

    Raises:
        This method will raise the exception received from `operation.exception()`
        or RuntimeError if there is no exception set, but there is an `error_code`
        set for the `operation`.

        In case of an operation taking longer than `timeout` seconds to complete,
        a `concurrent.futures.TimeoutError` will be raised.
    """
    result = operation.result(timeout=timeout)

    if operation.error_code:
        print(
            f"Error during {verbose_name}: [Code: {operation.error_code}]: {operation.error_message}",
            file=sys.stderr,
            flush=True,
        )
        print(f"Operation ID: {operation.name}", file=sys.stderr, flush=True)
        raise operation.exception() or RuntimeError(operation.error_message)

    if operation.warnings:
        print(f"Warnings during {verbose_name}:\n", file=sys.stderr, flush=True)
        for warning in operation.warnings:
            print(f" - {warning.code}: {warning.message}", file=sys.stderr, flush=True)

    return result


def delete_route(project_id: str, route_name: str) -> None:
    """
    Delete a route in project.

    Args:
        project_id: project ID or project number of the Cloud project you want to use.
        route_name: name of the route to delete.
    """

    route_client = compute_v1.RoutesClient()
    operation = route_client.delete(project=project_id, route=route_name)

    wait_for_extended_operation(operation, "route deletion")

resource "google_compute_instance" "default" {
  project      = var.project_id # Replace this with your project ID in quotes
  zone         = "southamerica-east1-b"
  name         = "instance-next-hop"
  machine_type = "e2-medium"
  boot_disk {
    initialize_params {
      image = "debian-cloud/debian-9"
    }
  }
  network_interface {
    network = "default"
  }
  can_ip_forward = true
}