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standalone.rs
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standalone.rs
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// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
use crate::colors;
use crate::file_fetcher::get_source_from_data_url;
use crate::flags::Flags;
use crate::ops;
use crate::program_state::ProgramState;
use crate::version;
use deno_core::error::anyhow;
use deno_core::error::type_error;
use deno_core::error::AnyError;
use deno_core::error::Context;
use deno_core::futures::FutureExt;
use deno_core::located_script_name;
use deno_core::resolve_url;
use deno_core::serde::Deserialize;
use deno_core::serde::Serialize;
use deno_core::serde_json;
use deno_core::url::Url;
use deno_core::v8_set_flags;
use deno_core::ModuleLoader;
use deno_core::ModuleSpecifier;
use deno_core::OpState;
use deno_runtime::deno_broadcast_channel::InMemoryBroadcastChannel;
use deno_runtime::deno_web::BlobStore;
use deno_runtime::permissions::Permissions;
use deno_runtime::permissions::PermissionsOptions;
use deno_runtime::worker::MainWorker;
use deno_runtime::worker::WorkerOptions;
use deno_tls::create_default_root_cert_store;
use log::Level;
use std::cell::RefCell;
use std::convert::TryInto;
use std::env::current_exe;
use std::fs::File;
use std::io::BufReader;
use std::io::Cursor;
use std::io::Read;
use std::io::Seek;
use std::io::SeekFrom;
use std::iter::once;
use std::pin::Pin;
use std::rc::Rc;
use std::sync::Arc;
#[derive(Deserialize, Serialize)]
pub struct Metadata {
pub argv: Vec<String>,
pub unstable: bool,
pub seed: Option<u64>,
pub permissions: PermissionsOptions,
pub location: Option<Url>,
pub v8_flags: Vec<String>,
pub log_level: Option<Level>,
pub ca_stores: Option<Vec<String>>,
pub ca_data: Option<Vec<u8>>,
pub unsafely_ignore_certificate_errors: Option<Vec<String>>,
}
pub const MAGIC_TRAILER: &[u8; 8] = b"d3n0l4nd";
/// This function will try to run this binary as a standalone binary
/// produced by `deno compile`. It determines if this is a standalone
/// binary by checking for the magic trailer string `D3N0` at EOF-12.
/// The magic trailer is followed by:
/// - a u64 pointer to the JS bundle embedded in the binary
/// - a u64 pointer to JSON metadata (serialized flags) embedded in the binary
/// These are dereferenced, and the bundle is executed under the configuration
/// specified by the metadata. If no magic trailer is present, this function
/// exits with `Ok(None)`.
pub fn extract_standalone(
args: Vec<String>,
) -> Result<Option<(Metadata, String)>, AnyError> {
let current_exe_path = current_exe()?;
let mut current_exe = File::open(current_exe_path)?;
let trailer_pos = current_exe.seek(SeekFrom::End(-24))?;
let mut trailer = [0; 24];
current_exe.read_exact(&mut trailer)?;
let (magic_trailer, rest) = trailer.split_at(8);
if magic_trailer != MAGIC_TRAILER {
return Ok(None);
}
let (bundle_pos, rest) = rest.split_at(8);
let metadata_pos = rest;
let bundle_pos = u64_from_bytes(bundle_pos)?;
let metadata_pos = u64_from_bytes(metadata_pos)?;
let bundle_len = metadata_pos - bundle_pos;
let metadata_len = trailer_pos - metadata_pos;
current_exe.seek(SeekFrom::Start(bundle_pos))?;
let bundle = read_string_slice(&mut current_exe, bundle_pos, bundle_len)
.context("Failed to read source bundle from the current executable")?;
let metadata =
read_string_slice(&mut current_exe, metadata_pos, metadata_len)
.context("Failed to read metadata from the current executable")?;
let mut metadata: Metadata = serde_json::from_str(&metadata).unwrap();
metadata.argv.append(&mut args[1..].to_vec());
Ok(Some((metadata, bundle)))
}
fn u64_from_bytes(arr: &[u8]) -> Result<u64, AnyError> {
let fixed_arr: &[u8; 8] = arr
.try_into()
.context("Failed to convert the buffer into a fixed-size array")?;
Ok(u64::from_be_bytes(*fixed_arr))
}
fn read_string_slice(
file: &mut File,
pos: u64,
len: u64,
) -> Result<String, AnyError> {
let mut string = String::new();
file.seek(SeekFrom::Start(pos))?;
file.take(len).read_to_string(&mut string)?;
// TODO: check amount of bytes read
Ok(string)
}
const SPECIFIER: &str = "file:https://$deno$/bundle.js";
struct EmbeddedModuleLoader(String);
impl ModuleLoader for EmbeddedModuleLoader {
fn resolve(
&self,
_op_state: Rc<RefCell<OpState>>,
specifier: &str,
_referrer: &str,
_is_main: bool,
) -> Result<ModuleSpecifier, AnyError> {
if let Ok(module_specifier) = resolve_url(specifier) {
if get_source_from_data_url(&module_specifier).is_ok()
|| specifier == SPECIFIER
{
return Ok(module_specifier);
}
}
Err(type_error(
"Self-contained binaries don't support module loading",
))
}
fn load(
&self,
_op_state: Rc<RefCell<OpState>>,
module_specifier: &ModuleSpecifier,
_maybe_referrer: Option<ModuleSpecifier>,
_is_dynamic: bool,
) -> Pin<Box<deno_core::ModuleSourceFuture>> {
let module_specifier = module_specifier.clone();
let is_data_uri = get_source_from_data_url(&module_specifier).ok();
let code = if let Some((ref source, _)) = is_data_uri {
source.to_string()
} else {
self.0.to_string()
};
async move {
if is_data_uri.is_none() && module_specifier.to_string() != SPECIFIER {
return Err(type_error(
"Self-contained binaries don't support module loading",
));
}
Ok(deno_core::ModuleSource {
code,
module_url_specified: module_specifier.to_string(),
module_url_found: module_specifier.to_string(),
})
}
.boxed_local()
}
}
fn metadata_to_flags(metadata: &Metadata) -> Flags {
let permissions = metadata.permissions.clone();
Flags {
argv: metadata.argv.clone(),
unstable: metadata.unstable,
seed: metadata.seed,
location: metadata.location.clone(),
allow_env: permissions.allow_env,
allow_hrtime: permissions.allow_hrtime,
allow_net: permissions.allow_net,
allow_ffi: permissions.allow_ffi,
allow_read: permissions.allow_read,
allow_run: permissions.allow_run,
allow_write: permissions.allow_write,
v8_flags: metadata.v8_flags.clone(),
log_level: metadata.log_level,
ca_stores: metadata.ca_stores.clone(),
..Default::default()
}
}
pub async fn run(
source_code: String,
metadata: Metadata,
) -> Result<(), AnyError> {
let flags = metadata_to_flags(&metadata);
let main_module = resolve_url(SPECIFIER)?;
let program_state = ProgramState::build(flags).await?;
let permissions = Permissions::from_options(&metadata.permissions);
let blob_store = BlobStore::default();
let broadcast_channel = InMemoryBroadcastChannel::default();
let module_loader = Rc::new(EmbeddedModuleLoader(source_code));
let create_web_worker_cb = Arc::new(|_| {
todo!("Worker are currently not supported in standalone binaries");
});
// Keep in sync with `main.rs`.
v8_set_flags(
once("UNUSED_BUT_NECESSARY_ARG0".to_owned())
.chain(metadata.v8_flags.iter().cloned())
.collect::<Vec<_>>(),
);
let mut root_cert_store = program_state
.root_cert_store
.clone()
.unwrap_or_else(create_default_root_cert_store);
if let Some(cert) = metadata.ca_data {
let reader = &mut BufReader::new(Cursor::new(cert));
// This function does not return specific errors, if it fails give a generic message.
if let Err(_err) = root_cert_store.add_pem_file(reader) {
return Err(anyhow!("Unable to add pem file to certificate store"));
}
}
let options = WorkerOptions {
apply_source_maps: false,
args: metadata.argv,
debug_flag: metadata.log_level.map_or(false, |l| l == log::Level::Debug),
user_agent: version::get_user_agent(),
unstable: metadata.unstable,
enable_testing_features: false,
unsafely_ignore_certificate_errors: metadata
.unsafely_ignore_certificate_errors,
root_cert_store: Some(root_cert_store),
seed: metadata.seed,
js_error_create_fn: None,
create_web_worker_cb,
maybe_inspector_server: None,
should_break_on_first_statement: false,
module_loader,
runtime_version: version::deno(),
ts_version: version::TYPESCRIPT.to_string(),
no_color: !colors::use_color(),
get_error_class_fn: Some(&get_error_class_name),
location: metadata.location,
origin_storage_dir: None,
blob_store,
broadcast_channel,
shared_array_buffer_store: None,
cpu_count: num_cpus::get(),
};
let mut worker =
MainWorker::from_options(main_module.clone(), permissions, &options);
{
let js_runtime = &mut worker.js_runtime;
js_runtime
.op_state()
.borrow_mut()
.put::<Arc<ProgramState>>(program_state.clone());
ops::errors::init(js_runtime);
ops::runtime_compiler::init(js_runtime);
js_runtime.sync_ops_cache();
}
worker.bootstrap(&options);
worker.execute_main_module(&main_module).await?;
worker.execute_script(
&located_script_name!(),
"window.dispatchEvent(new Event('load'))",
)?;
worker.run_event_loop(true).await?;
worker.execute_script(
&located_script_name!(),
"window.dispatchEvent(new Event('unload'))",
)?;
std::process::exit(0);
}
fn get_error_class_name(e: &AnyError) -> &'static str {
deno_runtime::errors::get_error_class_name(e).unwrap_or_else(|| {
panic!(
"Error '{}' contains boxed error of unsupported type:{}",
e,
e.chain()
.map(|e| format!("\n {:?}", e))
.collect::<String>()
);
})
}