pitrou commented on code in PR #5080:
URL: https://github.com/apache/arrow-rs/pull/5080#discussion_r1395499722
##########
arrow-integration-testing/src/lib.rs:
##########
@@ -100,3 +166,147 @@ pub fn read_gzip_json(version: &str, path: &str) ->
ArrowJson {
let arrow_json: ArrowJson = serde_json::from_str(&s).unwrap();
arrow_json
}
+
+//
+// C Data Integration entrypoints
+//
+
+fn cdata_integration_export_schema_from_json(
+ c_json_name: *const i8,
+ out: *mut FFI_ArrowSchema,
+) -> Result<()> {
+ let json_name = unsafe { CStr::from_ptr(c_json_name) };
+ let f = read_json_file_metadata(json_name.to_str()?)?;
+ let c_schema = FFI_ArrowSchema::try_from(&f.schema)?;
+ // Move exported schema into output struct
+ unsafe { ptr::write(out, c_schema) };
+ Ok(())
+}
+
+fn cdata_integration_export_batch_from_json(
+ c_json_name: *const i8,
+ batch_num: c_int,
+ out: *mut FFI_ArrowArray,
+) -> Result<()> {
+ let json_name = unsafe { CStr::from_ptr(c_json_name) };
+ let b = read_single_batch_from_json_file(json_name.to_str()?,
batch_num.try_into().unwrap())?;
+ let a = StructArray::from(b).into_data();
+ let c_array = FFI_ArrowArray::new(&a);
+ // Move exported array into output struct
+ unsafe { ptr::write(out, c_array) };
+ Ok(())
+}
+
+fn cdata_integration_import_schema_and_compare_to_json(
+ c_json_name: *const i8,
+ c_schema: *mut FFI_ArrowSchema,
+) -> Result<()> {
+ let json_name = unsafe { CStr::from_ptr(c_json_name) };
+ let json_schema = read_json_file_metadata(json_name.to_str()?)?.schema;
+
+ // The source ArrowSchema will be released when this is dropped
+ let imported_schema = unsafe { std::ptr::replace(c_schema,
FFI_ArrowSchema::empty()) };
Review Comment:
This is also why I would suggest higher-level functions to avoid reinventing
this in every consumer:
```rust
/// Import schema from C Data Interface
///
/// # Safety
///
/// This function ensures the given ArrowSchema struct has been filled
/// by a compliant exporter.
pub unsafe fn import_schema(c_schema: *mut FFI_ArrowSchema) ->
Result<Schema> {
let imported_schema = unsafe { std::ptr::replace(c_schema,
FFI_ArrowSchema::empty()) };
Schema::try_from(&imported_schema)
}
```
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