feat: release Dever 0.1.5 with direct workers and long transactions

sdk/c/dever_ffi.h

@@ -0,0 +1,40 @@
+#ifndef DEVER_FFI_H
+#define DEVER_FFI_H
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define DEVER_FFI_ABI_V1 1
+#define DEVER_FFI_OK 0
+#define DEVER_FFI_ERROR 1
+#define DEVER_FFI_FAULT 2
+
+typedef struct {
+    const char *data;
+    uint64_t size;
+} dever_ffi_slice;
+
+typedef struct {
+    char *data;
+    uint64_t capacity;
+    uint64_t size;
+} dever_ffi_output;
+
+typedef struct {
+    uint32_t abi;
+    void *context;
+    int (*open)(void *context, dever_ffi_slice setting);
+    int (*invoke)(void *context, dever_ffi_slice operation, dever_ffi_slice payload, dever_ffi_output *output);
+    void (*close)(void *context);
+} dever_ffi_handler;
+
+int dever_ffi_serve(const dever_ffi_handler *handler);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif