WIP: Improved async api for arrow1

Cargo.toml

@@ -58,7 +58,7 @@ full = [
 ]
 
 [dependencies]
-wasm-bindgen = { version = "0.2.83", features = ["serde-serialize"] }
+wasm-bindgen = { version = "0.2.88", features = ["serde-serialize"] }
 
 # The `console_error_panic_hook` crate provides better debugging of panics by
 # logging them with `console.error`. This is great for development, but requires

src/arrow1/metadata.rs

@@ -0,0 +1,230 @@
+use crate::arrow1::error::WasmResult;
+use wasm_bindgen::prelude::*;
+
+/// Global Parquet metadata.
+#[derive(Debug, Clone)]
+#[wasm_bindgen]
+pub struct ParquetMetaData(parquet::file::metadata::ParquetMetaData);
+
+#[wasm_bindgen]
+impl ParquetMetaData {
+    /// Returns file metadata as reference.
+    #[wasm_bindgen]
+    pub fn file_metadata(&self) -> FileMetaData {
+        self.0.file_metadata().clone().into()
+    }
+
+    /// Returns number of row groups in this file.
+    #[wasm_bindgen]
+    pub fn num_row_groups(&self) -> usize {
+        self.0.num_row_groups()
+    }
+
+    /// Returns row group metadata for `i`th position.
+    /// Position should be less than number of row groups `num_row_groups`.
+    #[wasm_bindgen]
+    pub fn row_group(&self, i: usize) -> RowGroupMetaData {
+        self.0.row_group(i).clone().into()
+    }
+
+    // /// Returns the column index for this file if loaded
+    // pub fn column_index(&self) -> Option<ParquetColumnIndex> {
+    //     self.0.column_index()
+    // }
+}
+
+impl From<parquet::file::metadata::ParquetMetaData> for ParquetMetaData {
+    fn from(value: parquet::file::metadata::ParquetMetaData) -> Self {
+        Self(value)
+    }
+}
+
+impl From<ParquetMetaData> for parquet::file::metadata::ParquetMetaData {
+    fn from(value: ParquetMetaData) -> Self {
+        value.0
+    }
+}
+
+/// Metadata for a Parquet file.
+#[derive(Debug, Clone)]
+#[wasm_bindgen]
+pub struct FileMetaData(parquet::file::metadata::FileMetaData);
+
+#[wasm_bindgen]
+impl FileMetaData {
+    /// Returns version of this file.
+    #[wasm_bindgen]
+    pub fn version(&self) -> i32 {
+        self.0.version()
+    }
+
+    /// Returns number of rows in the file.
+    #[wasm_bindgen]
+    pub fn num_rows(&self) -> i64 {
+        self.0.num_rows()
+    }
+
+    /// String message for application that wrote this file.
+    ///
+    /// This should have the following format:
+    /// `<application> version <application version> (build <application build hash>)`.
+    ///
+    /// ```shell
+    /// parquet-mr version 1.8.0 (build 0fda28af84b9746396014ad6a415b90592a98b3b)
+    /// ```
+    #[wasm_bindgen]
+    pub fn created_by(&self) -> Option<String> {
+        self.0.created_by().map(|s| s.to_string())
+    }
+
+    /// Returns key_value_metadata of this file.
+    #[wasm_bindgen]
+    pub fn key_value_metadata(&self) -> Result<js_sys::Map, JsValue> {
+        let map = js_sys::Map::new();
+        if let Some(metadata) = self.0.key_value_metadata() {
+            for meta in metadata {
+                if let Some(value) = &meta.value {
+                    map.set(&JsValue::from_str(&meta.key), &JsValue::from_str(value));
+                }
+            }
+        }
+        Ok(map)
+    }
+}
+
+impl From<parquet::file::metadata::FileMetaData> for FileMetaData {
+    fn from(value: parquet::file::metadata::FileMetaData) -> Self {
+        Self(value)
+    }
+}
+
+impl From<FileMetaData> for parquet::file::metadata::FileMetaData {
+    fn from(value: FileMetaData) -> Self {
+        value.0
+    }
+}
+
+/// Metadata for a Parquet row group.
+#[derive(Debug, Clone)]
+#[wasm_bindgen]
+pub struct RowGroupMetaData(parquet::file::metadata::RowGroupMetaData);
+
+#[wasm_bindgen]
+impl RowGroupMetaData {
+    /// Number of columns in this row group.
+    #[wasm_bindgen]
+    pub fn num_columns(&self) -> usize {
+        self.0.num_columns()
+    }
+
+    /// Returns column chunk metadata for `i`th column.
+    #[wasm_bindgen]
+    pub fn column(&self, i: usize) -> ColumnChunkMetaData {
+        self.0.column(i).clone().into()
+    }
+
+    /// Number of rows in this row group.
+    #[wasm_bindgen]
+    pub fn num_rows(&self) -> i64 {
+        self.0.num_rows()
+    }
+
+    /// Total byte size of all uncompressed column data in this row group.
+    #[wasm_bindgen]
+    pub fn total_byte_size(&self) -> i64 {
+        self.0.total_byte_size()
+    }
+
+    /// Total size of all compressed column data in this row group.
+    #[wasm_bindgen]
+    pub fn compressed_size(&self) -> i64 {
+        self.0.compressed_size()
+    }
+}
+
+impl From<parquet::file::metadata::RowGroupMetaData> for RowGroupMetaData {
+    fn from(value: parquet::file::metadata::RowGroupMetaData) -> Self {
+        Self(value)
+    }
+}
+
+impl From<RowGroupMetaData> for parquet::file::metadata::RowGroupMetaData {
+    fn from(value: RowGroupMetaData) -> Self {
+        value.0
+    }
+}
+
+/// Metadata for a Parquet column chunk.
+#[derive(Debug, Clone)]
+#[wasm_bindgen]
+pub struct ColumnChunkMetaData(parquet::file::metadata::ColumnChunkMetaData);
+
+#[wasm_bindgen]
+impl ColumnChunkMetaData {
+    /// File where the column chunk is stored.
+    ///
+    /// If not set, assumed to belong to the same file as the metadata.
+    /// This path is relative to the current file.
+    #[wasm_bindgen]
+    pub fn file_path(&self) -> Option<String> {
+        self.0.file_path().map(|s| s.to_string())
+    }
+
+    /// Byte offset in `file_path()`.
+    #[wasm_bindgen]
+    pub fn file_offset(&self) -> i64 {
+        self.0.file_offset()
+    }
+
+    // /// Type of this column. Must be primitive.
+    // pub fn column_type(&self) -> Type {
+    //     self.column_descr.physical_type()
+    // }
+
+    /// Path (or identifier) of this column.
+    #[wasm_bindgen]
+    pub fn column_path(&self) -> Vec<String> {
+        let path = self.0.column_path();
+        path.parts().to_vec()
+    }
+
+    // /// All encodings used for this column.
+    // pub fn encodings(&self) -> &Vec<Encoding> {
+    //     &self.encodings
+    // }
+
+    /// Total number of values in this column chunk.
+    #[wasm_bindgen]
+    pub fn num_values(&self) -> i64 {
+        self.0.num_values()
+    }
+
+    // /// Compression for this column.
+    // pub fn compression(&self) -> Compression {
+    //     self.compression
+    // }
+
+    /// Returns the total compressed data size of this column chunk.
+    #[wasm_bindgen]
+    pub fn compressed_size(&self) -> i64 {
+        self.0.compressed_size()
+    }
+
+    /// Returns the total uncompressed data size of this column chunk.
+    #[wasm_bindgen]
+    pub fn uncompressed_size(&self) -> i64 {
+        self.0.uncompressed_size()
+    }
+}
+
+impl From<parquet::file::metadata::ColumnChunkMetaData> for ColumnChunkMetaData {
+    fn from(value: parquet::file::metadata::ColumnChunkMetaData) -> Self {
+        Self(value)
+    }
+}
+
+impl From<ColumnChunkMetaData> for parquet::file::metadata::ColumnChunkMetaData {
+    fn from(value: ColumnChunkMetaData) -> Self {
+        value.0
+    }
+}

src/arrow1/mod.rs

@@ -1,15 +1,11 @@
+pub mod error;
+pub mod metadata;
 #[cfg(feature = "reader")]
 pub mod reader;
-
+#[cfg(all(feature = "reader", feature = "async"))]
+pub mod reader_async;
 pub mod wasm;
-
 #[cfg(feature = "writer")]
 pub mod writer;
-
 #[cfg(feature = "writer")]
 pub mod writer_properties;
-
-pub mod error;
-
-#[cfg(all(feature = "reader", feature = "async"))]
-pub mod reader_async;