1 files changed, 57 insertions, 0 deletions
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/kotlin/templates/NamespaceLibraryTemplate.kt b/third_party/rust/uniffi_bindgen/src/bindings/kotlin/templates/NamespaceLibraryTemplate.kt
new file mode 100644
index 0000000000..6a3aeada35
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/kotlin/templates/NamespaceLibraryTemplate.kt
@@ -0,0 +1,57 @@
+@Synchronized
+private fun findLibraryName(componentName: String): String {
+    val libOverride = System.getProperty("uniffi.component.$componentName.libraryOverride")
+    if (libOverride != null) {
+        return libOverride
+    }
+    return "{{ config.cdylib_name() }}"
+}
+
+private inline fun <reified Lib : Library> loadIndirect(
+    componentName: String
+): Lib {
+    return Native.load<Lib>(findLibraryName(componentName), Lib::class.java)
+}
+
+// A JNA Library to expose the extern-C FFI definitions.
+// This is an implementation detail which will be called internally by the public API.
+
+internal interface _UniFFILib : Library {
+    companion object {
+        internal val INSTANCE: _UniFFILib by lazy {
+            loadIndirect<_UniFFILib>(componentName = "{{ ci.namespace() }}")
+            .also { lib: _UniFFILib ->
+                uniffiCheckContractApiVersion(lib)
+                uniffiCheckApiChecksums(lib)
+                {% for fn in self.initialization_fns() -%}
+                {{ fn }}(lib)
+                {% endfor -%}
+            }
+        }
+    }
+
+    {% for func in ci.iter_ffi_function_definitions() -%}
+    fun {{ func.name() }}(
+        {%- call kt::arg_list_ffi_decl(func) %}
+    ): {% match func.return_type() %}{% when Some with (return_type) %}{{ return_type.borrow()|ffi_type_name_by_value }}{% when None %}Unit{% endmatch %}
+    {% endfor %}
+}
+
+private fun uniffiCheckContractApiVersion(lib: _UniFFILib) {
+    // Get the bindings contract version from our ComponentInterface
+    val bindings_contract_version = {{ ci.uniffi_contract_version() }}
+    // Get the scaffolding contract version by calling the into the dylib
+    val scaffolding_contract_version = lib.{{ ci.ffi_uniffi_contract_version().name() }}()
+    if (bindings_contract_version != scaffolding_contract_version) {
+        throw RuntimeException("UniFFI contract version mismatch: try cleaning and rebuilding your project")
+    }
+}
+
+@Suppress("UNUSED_PARAMETER")
+private fun uniffiCheckApiChecksums(lib: _UniFFILib) {
+    {%- for (name, expected_checksum) in ci.iter_checksums() %}
+    if (lib.{{ name }}() != {{ expected_checksum }}.toShort()) {
+        throw RuntimeException("UniFFI API checksum mismatch: try cleaning and rebuilding your project")
+    }
+    {%- endfor %}
+}