1 files changed, 110 insertions, 0 deletions
diff --git a/src/isolate_state.rs b/src/isolate_state.rs
new file mode 100644
index 000000000..4cc010389
--- /dev/null
+++ b/src/isolate_state.rs
@@ -0,0 +1,110 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+use crate::cli::Buf;
+use crate::deno_dir;
+use crate::flags;
+use crate::global_timer::GlobalTimer;
+use crate::modules::Modules;
+use futures::sync::mpsc as async_mpsc;
+use std;
+use std::env;
+use std::sync::atomic::{AtomicUsize, Ordering};
+use std::sync::Mutex;
+
+pub type WorkerSender = async_mpsc::Sender<Buf>;
+pub type WorkerReceiver = async_mpsc::Receiver<Buf>;
+pub type WorkerChannels = (WorkerSender, WorkerReceiver);
+
+// AtomicU64 is currently unstable
+#[derive(Default)]
+pub struct Metrics {
+  pub ops_dispatched: AtomicUsize,
+  pub ops_completed: AtomicUsize,
+  pub bytes_sent_control: AtomicUsize,
+  pub bytes_sent_data: AtomicUsize,
+  pub bytes_received: AtomicUsize,
+  pub resolve_count: AtomicUsize,
+}
+
+// Isolate cannot be passed between threads but IsolateState can.
+// IsolateState satisfies Send and Sync.
+// So any state that needs to be accessed outside the main V8 thread should be
+// inside IsolateState.
+#[cfg_attr(feature = "cargo-clippy", allow(stutter))]
+pub struct IsolateState {
+  pub dir: deno_dir::DenoDir,
+  pub argv: Vec<String>,
+  pub flags: flags::DenoFlags,
+  pub metrics: Metrics,
+  pub modules: Mutex<Modules>,
+  pub worker_channels: Option<Mutex<WorkerChannels>>,
+  pub global_timer: Mutex<GlobalTimer>,
+}
+
+impl IsolateState {
+  pub fn new(
+    flags: flags::DenoFlags,
+    argv_rest: Vec<String>,
+    worker_channels: Option<WorkerChannels>,
+  ) -> Self {
+    let custom_root = env::var("DENO_DIR").map(|s| s.into()).ok();
+
+    Self {
+      dir: deno_dir::DenoDir::new(flags.reload, flags.recompile, custom_root)
+        .unwrap(),
+      argv: argv_rest,
+      flags,
+      metrics: Metrics::default(),
+      modules: Mutex::new(Modules::new()),
+      worker_channels: worker_channels.map(Mutex::new),
+      global_timer: Mutex::new(GlobalTimer::new()),
+    }
+  }
+
+  pub fn main_module(&self) -> Option<String> {
+    if self.argv.len() <= 1 {
+      None
+    } else {
+      let specifier = self.argv[1].clone();
+      let referrer = ".";
+      match self.dir.resolve_module_url(&specifier, referrer) {
+        Ok(url) => Some(url.to_string()),
+        Err(e) => {
+          debug!("Potentially swallowed error {}", e);
+          None
+        }
+      }
+    }
+  }
+
+  #[cfg(test)]
+  pub fn mock() -> IsolateState {
+    let argv = vec![String::from("./deno"), String::from("hello.js")];
+    // For debugging: argv.push_back(String::from("-D"));
+    let (flags, rest_argv, _) = flags::set_flags(argv).unwrap();
+    IsolateState::new(flags, rest_argv, None)
+  }
+
+  pub fn metrics_op_dispatched(
+    &self,
+    bytes_sent_control: usize,
+    bytes_sent_data: usize,
+  ) {
+    self.metrics.ops_dispatched.fetch_add(1, Ordering::SeqCst);
+    self
+      .metrics
+      .bytes_sent_control
+      .fetch_add(bytes_sent_control, Ordering::SeqCst);
+    self
+      .metrics
+      .bytes_sent_data
+      .fetch_add(bytes_sent_data, Ordering::SeqCst);
+  }
+
+  pub fn metrics_op_completed(&self, bytes_received: usize) {
+    self.metrics.ops_completed.fetch_add(1, Ordering::SeqCst);
+    self
+      .metrics
+      .bytes_received
+      .fetch_add(bytes_received, Ordering::SeqCst);
+  }
+}