deno/runtime/snapshot.rs

// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.

use crate::ops;
use crate::ops::bootstrap::SnapshotOptions;
use crate::shared::maybe_transpile_source;
use crate::shared::runtime;
use deno_cache::SqliteBackedCache;
use deno_core::error::AnyError;
use deno_core::snapshot::*;
use deno_core::v8;
use deno_core::Extension;
use deno_http::DefaultHttpPropertyExtractor;
use deno_io::fs::FsError;
use std::io::Write;
use std::path::Path;
use std::path::PathBuf;
use std::rc::Rc;
use std::sync::Arc;

#[derive(Clone)]
struct Permissions;

impl deno_websocket::WebSocketPermissions for Permissions {
  fn check_net_url(
    &mut self,
    _url: &deno_core::url::Url,
    _api_name: &str,
  ) -> Result<(), deno_core::error::AnyError> {
    unreachable!("snapshotting!")
  }
}

impl deno_web::TimersPermission for Permissions {
  fn allow_hrtime(&mut self) -> bool {
    unreachable!("snapshotting!")
  }
}

impl deno_fetch::FetchPermissions for Permissions {
  fn check_net_url(
    &mut self,
    _url: &deno_core::url::Url,
    _api_name: &str,
  ) -> Result<(), deno_core::error::AnyError> {
    unreachable!("snapshotting!")
  }

  fn check_read(
    &mut self,
    _p: &Path,
    _api_name: &str,
  ) -> Result<(), deno_core::error::AnyError> {
    unreachable!("snapshotting!")
  }
}

impl deno_ffi::FfiPermissions for Permissions {
  fn check_partial(
    &mut self,
    _path: Option<&Path>,
  ) -> Result<(), deno_core::error::AnyError> {
    unreachable!("snapshotting!")
  }
}

impl deno_napi::NapiPermissions for Permissions {
  fn check(
    &mut self,
    _path: Option<&Path>,
  ) -> Result<(), deno_core::error::AnyError> {
    unreachable!("snapshotting!")
  }
}

impl deno_node::NodePermissions for Permissions {
  fn check_net_url(
    &mut self,
    _url: &deno_core::url::Url,
    _api_name: &str,
  ) -> Result<(), deno_core::error::AnyError> {
    unreachable!("snapshotting!")
  }
  fn check_read_with_api_name(
    &mut self,
    _p: &Path,
    _api_name: Option<&str>,
  ) -> Result<(), deno_core::error::AnyError> {
    unreachable!("snapshotting!")
  }
  fn check_write_with_api_name(
    &mut self,
    _p: &Path,
    _api_name: Option<&str>,
  ) -> Result<(), deno_core::error::AnyError> {
    unreachable!("snapshotting!")
  }
  fn check_sys(
    &mut self,
    _kind: &str,
    _api_name: &str,
  ) -> Result<(), deno_core::error::AnyError> {
    unreachable!("snapshotting!")
  }
}

impl deno_net::NetPermissions for Permissions {
  fn check_net<T: AsRef<str>>(
    &mut self,
    _host: &(T, Option<u16>),
    _api_name: &str,
  ) -> Result<(), deno_core::error::AnyError> {
    unreachable!("snapshotting!")
  }

  fn check_read(
    &mut self,
    _p: &Path,
    _api_name: &str,
  ) -> Result<(), deno_core::error::AnyError> {
    unreachable!("snapshotting!")
  }

  fn check_write(
    &mut self,
    _p: &Path,
    _api_name: &str,
  ) -> Result<(), deno_core::error::AnyError> {
    unreachable!("snapshotting!")
  }
}

impl deno_fs::FsPermissions for Permissions {
  fn check_open<'a>(
    &mut self,
    _resolved: bool,
    _read: bool,
    _write: bool,
    _path: &'a Path,
    _api_name: &str,
  ) -> Result<std::borrow::Cow<'a, Path>, FsError> {
    unreachable!("snapshotting!")
  }

  fn check_read(
    &mut self,
    _path: &Path,
    _api_name: &str,
  ) -> Result<(), AnyError> {
    unreachable!("snapshotting!")
  }

  fn check_read_all(&mut self, _api_name: &str) -> Result<(), AnyError> {
    unreachable!("snapshotting!")
  }

  fn check_read_blind(
    &mut self,
    _path: &Path,
    _display: &str,
    _api_name: &str,
  ) -> Result<(), AnyError> {
    unreachable!("snapshotting!")
  }

  fn check_write(
    &mut self,
    _path: &Path,
    _api_name: &str,
  ) -> Result<(), AnyError> {
    unreachable!("snapshotting!")
  }

  fn check_write_partial(
    &mut self,
    _path: &Path,
    _api_name: &str,
  ) -> Result<(), AnyError> {
    unreachable!("snapshotting!")
  }

  fn check_write_all(&mut self, _api_name: &str) -> Result<(), AnyError> {
    unreachable!("snapshotting!")
  }

  fn check_write_blind(
    &mut self,
    _path: &Path,
    _display: &str,
    _api_name: &str,
  ) -> Result<(), AnyError> {
    unreachable!("snapshotting!")
  }
}

impl deno_kv::sqlite::SqliteDbHandlerPermissions for Permissions {
  fn check_read(
    &mut self,
    _path: &Path,
    _api_name: &str,
  ) -> Result<(), AnyError> {
    unreachable!("snapshotting!")
  }

  fn check_write(
    &mut self,
    _path: &Path,
    _api_name: &str,
  ) -> Result<(), AnyError> {
    unreachable!("snapshotting!")
  }
}

pub fn create_runtime_snapshot(
  snapshot_path: PathBuf,
  snapshot_options: SnapshotOptions,
  // NOTE: For embedders that wish to add additional extensions to the snapshot
  custom_extensions: Vec<Extension>,
) {
  // NOTE(bartlomieju): ordering is important here, keep it in sync with
  // `runtime/worker.rs`, `runtime/web_worker.rs` and `runtime/snapshot.rs`!
  let fs = std::sync::Arc::new(deno_fs::RealFs);
  let mut extensions: Vec<Extension> = vec![
    deno_webidl::deno_webidl::init_ops_and_esm(),
    deno_console::deno_console::init_ops_and_esm(),
    deno_url::deno_url::init_ops_and_esm(),
    deno_web::deno_web::init_ops_and_esm::<Permissions>(
      Default::default(),
      Default::default(),
    ),
    deno_webgpu::deno_webgpu::init_ops_and_esm(),
    deno_canvas::deno_canvas::init_ops_and_esm(),
    deno_fetch::deno_fetch::init_ops_and_esm::<Permissions>(Default::default()),
    deno_cache::deno_cache::init_ops_and_esm::<SqliteBackedCache>(None),
    deno_websocket::deno_websocket::init_ops_and_esm::<Permissions>(
      "".to_owned(),
      None,
      None,
    ),
    deno_webstorage::deno_webstorage::init_ops_and_esm(None),
    deno_crypto::deno_crypto::init_ops_and_esm(None),
    deno_broadcast_channel::deno_broadcast_channel::init_ops_and_esm(
      deno_broadcast_channel::InMemoryBroadcastChannel::default(),
    ),
    deno_ffi::deno_ffi::init_ops_and_esm::<Permissions>(),
    deno_net::deno_net::init_ops_and_esm::<Permissions>(None, None),
    deno_tls::deno_tls::init_ops_and_esm(),
    deno_kv::deno_kv::init_ops_and_esm(deno_kv::sqlite::SqliteDbHandler::<
      Permissions,
    >::new(None, None)),
    deno_cron::deno_cron::init_ops_and_esm(
      deno_cron::local::LocalCronHandler::new(),
    ),
    deno_napi::deno_napi::init_ops_and_esm::<Permissions>(),
    deno_http::deno_http::init_ops_and_esm::<DefaultHttpPropertyExtractor>(),
    deno_io::deno_io::init_ops_and_esm(Default::default()),
    deno_fs::deno_fs::init_ops_and_esm::<Permissions>(fs.clone()),
    deno_node::deno_node::init_ops_and_esm::<Permissions>(None, fs),
    runtime::init_ops_and_esm(),
    ops::runtime::deno_runtime::init_ops("deno:runtime".parse().unwrap()),
    ops::worker_host::deno_worker_host::init_ops(
      Arc::new(|_| unreachable!("not used in snapshot.")),
      None,
    ),
    ops::fs_events::deno_fs_events::init_ops(),
    ops::os::deno_os::init_ops(Default::default()),
    ops::permissions::deno_permissions::init_ops(),
    ops::process::deno_process::init_ops(),
    ops::signal::deno_signal::init_ops(),
    ops::tty::deno_tty::init_ops(),
    ops::http::deno_http_runtime::init_ops(),
    ops::bootstrap::deno_bootstrap::init_ops(Some(snapshot_options)),
    ops::web_worker::deno_web_worker::init_ops(),
  ];
  extensions.extend(custom_extensions);

  let output = create_snapshot(
    CreateSnapshotOptions {
      cargo_manifest_dir: env!("CARGO_MANIFEST_DIR"),
      startup_snapshot: None,
      extensions,
      extension_transpiler: Some(Rc::new(|specifier, source| {
        maybe_transpile_source(specifier, source)
      })),
      with_runtime_cb: Some(Box::new(|rt| {
        let isolate = rt.v8_isolate();
        let scope = &mut v8::HandleScope::new(isolate);

        let tmpl = deno_node::init_global_template(
          scope,
          deno_node::ContextInitMode::ForSnapshot,
        );
        let ctx = deno_node::create_v8_context(
          scope,
          tmpl,
          deno_node::ContextInitMode::ForSnapshot,
          std::ptr::null_mut(),
        );
        assert_eq!(scope.add_context(ctx), deno_node::VM_CONTEXT_INDEX);
      })),
      skip_op_registration: false,
    },
    None,
  )
  .unwrap();
  let mut snapshot = std::fs::File::create(snapshot_path).unwrap();
  snapshot.write_all(&output.output).unwrap();

  #[allow(clippy::print_stdout)]
  for path in output.files_loaded_during_snapshot {
    println!("cargo:rerun-if-changed={}", path.display());
  }
}