Feat/js metadata (#1548)

* feat: metadata effect

* feat: Metadata for effects

* chore: Add in the new types

libs/js_engine/src/artifacts/loadModule.js

@@ -1,7 +1,5 @@
-//@ts-check
-// @ts-ignore
+
 import Deno from "/deno_global.js";
-// @ts-ignore
 import * as mainModule from "/embassy.js";
 /**
  * This is using the simplified json pointer spec, using no escapes and arrays
@@ -20,45 +18,42 @@ function jsonPointerValue(obj, pointer) {
   return obj;
 }
 
-// @ts-ignore
+function maybeDate(value) {
+  if (!value) return value;
+  return new Date(value)
+}
 const writeFile = ({ path, volumeId, toWrite }) => Deno.core.opAsync("write_file",  volumeId, path, toWrite);
 
-// @ts-ignore
 const readFile = ({ volumeId, path }) => Deno.core.opAsync("read_file",  volumeId, path);
-// @ts-ignore
+const metadata = async ({ volumeId, path }) => {
+  const data = await Deno.core.opAsync("metadata",  volumeId, path)
+  return {
+    ...data,
+    modified: maybeDate(data.modified),
+    created: maybeDate(data.created),
+    accessed: maybeDate(data.accessed),
+  }
+};
 const removeFile = ({ volumeId, path }) => Deno.core.opAsync("remove_file",  volumeId, path);
-// @ts-ignore
 const isSandboxed = () => Deno.core.opSync("is_sandboxed");
 
-// @ts-ignore
 const writeJsonFile = ({ volumeId, path, toWrite }) =>
   writeFile({
     volumeId,
     path,
     toWrite: JSON.stringify(toWrite),
   });
-// @ts-ignore
 const readJsonFile = async ({ volumeId, path }) => JSON.parse(await readFile({ volumeId, path }));
-// @ts-ignore
 const createDir = ({ volumeId, path }) => Deno.core.opAsync("create_dir",  volumeId, path);
-// @ts-ignore
 const removeDir = ({ volumeId, path }) => Deno.core.opAsync("remove_dir",  volumeId, path);
-// @ts-ignore
 const trace = (x) => Deno.core.opSync("log_trace", x);
-// @ts-ignore
 const warn = (x) => Deno.core.opSync("log_warn", x);
-// @ts-ignore
 const error = (x) => Deno.core.opSync("log_error", x);
-// @ts-ignore
 const debug = (x) => Deno.core.opSync("log_debug", x);
-// @ts-ignore
 const info = (x) => Deno.core.opSync("log_info", x);
 
-// @ts-ignore
 const currentFunction = Deno.core.opSync("current_function");
-//@ts-ignore
 const input = Deno.core.opSync("get_input");
-// @ts-ignore
 const setState = (x) => Deno.core.opSync("set_value", x);
 const effects = {
   writeFile,
@@ -74,6 +69,7 @@ const effects = {
   removeFile,
   createDir,
   removeDir,
+  metadata  
 };
 
 const runFunction = jsonPointerValue(mainModule, currentFunction);

libs/js_engine/src/lib.rs

@@ -15,6 +15,7 @@ use helpers::NonDetachingJoinHandle;
 use models::{PackageId, ProcedureName, Version, VolumeId};
 use serde::{Deserialize, Serialize};
 use serde_json::Value;
+use std::time::SystemTime;
 use std::{path::Path, sync::Arc};
 use std::{path::PathBuf, pin::Pin};
 use tokio::io::AsyncReadExt;
@@ -60,6 +61,20 @@ impl JsError {
     }
 }
 
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct MetadataJs {
+    file_type: String,
+    is_dir: bool,
+    is_file: bool,
+    is_symlink: bool,
+    len: u64,
+    modified: Option<u64>,
+    accessed: Option<u64>,
+    created: Option<u64>,
+    readonly: bool,
+}
+
 #[cfg(target_arch = "x86_64")]
 const SNAPSHOT_BYTES: &[u8] = include_bytes!("./artifacts/JS_SNAPSHOT.bin");
 
@@ -240,6 +255,7 @@ impl JsExecutionEnvironment {
     fn declarations() -> Vec<OpDecl> {
         vec![
             fns::read_file::decl(),
+            fns::metadata::decl(),
             fns::write_file::decl(),
             fns::remove_file::decl(),
             fns::create_dir::decl(),
@@ -332,6 +348,8 @@ mod fns {
 
     use models::VolumeId;
 
+    use crate::{system_time_as_unix_ms, MetadataJs};
+
     use super::{AnswerState, JsContext};
 
     #[op]
@@ -359,6 +377,54 @@ mod fns {
         Ok(answer)
     }
     #[op]
+    async fn metadata(
+        state: Rc<RefCell<OpState>>,
+        volume_id: VolumeId,
+        path_in: PathBuf,
+    ) -> Result<MetadataJs, AnyError> {
+        let state = state.borrow();
+        let ctx: &JsContext = state.borrow();
+        let volume_path = ctx
+            .volumes
+            .path_for(&ctx.datadir, &ctx.package_id, &ctx.version, &volume_id)
+            .ok_or_else(|| anyhow!("There is no {} in volumes", volume_id))?;
+        //get_path_for in volume.rs
+        let new_file = volume_path.join(path_in);
+        if !is_subset(&volume_path, &new_file).await? {
+            bail!(
+                "Path '{}' has broken away from parent '{}'",
+                new_file.to_string_lossy(),
+                volume_path.to_string_lossy(),
+            );
+        }
+        let answer = tokio::fs::metadata(new_file).await?;
+        let metadata_js = MetadataJs {
+            file_type: format!("{:?}", answer.file_type()),
+            is_dir: answer.is_dir(),
+            is_file: answer.is_file(),
+            is_symlink: answer.is_symlink(),
+            len: answer.len(),
+            modified: answer
+                .modified()
+                .ok()
+                .as_ref()
+                .and_then(system_time_as_unix_ms),
+            accessed: answer
+                .accessed()
+                .ok()
+                .as_ref()
+                .and_then(system_time_as_unix_ms),
+            created: answer
+                .created()
+                .ok()
+                .as_ref()
+                .and_then(system_time_as_unix_ms),
+            readonly: answer.permissions().readonly(),
+        };
+
+        Ok(metadata_js)
+    }
+    #[op]
     async fn write_file(
         state: Rc<RefCell<OpState>>,
         volume_id: VolumeId,
@@ -564,3 +630,12 @@ mod fns {
         Ok(child.starts_with(parent))
     }
 }
+
+fn system_time_as_unix_ms(system_time: &SystemTime) -> Option<u64> {
+    system_time
+        .duration_since(SystemTime::UNIX_EPOCH)
+        .ok()?
+        .as_millis()
+        .try_into()
+        .ok()
+}