From 370c70dabac75e7f1b3d85f524e4ee5266c49aba Mon Sep 17 00:00:00 2001
From: Albert Cervin <albert@acervin.com>
Date: Sun, 6 Oct 2024 21:32:26 +0200
Subject: [PATCH] Start of jsonrpc interface

---
 flake.lock         | 12 ++++++------
 src/dged/json.c    |  4 ++++
 src/dged/json.h    |  9 +++++++++
 src/dged/jsonrpc.h | 32 ++++++++++++++++++++++++++++++++
 4 files changed, 51 insertions(+), 6 deletions(-)
 create mode 100644 src/dged/jsonrpc.h

diff --git a/flake.lock b/flake.lock
index 628df20..14fe178 100644
--- a/flake.lock
+++ b/flake.lock
@@ -5,11 +5,11 @@
         "systems": "systems"
       },
       "locked": {
-        "lastModified": 1710146030,
-        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
+        "lastModified": 1726560853,
+        "narHash": "sha256-X6rJYSESBVr3hBoH0WbKE5KvhPU5bloyZ2L4K60/fPQ=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
+        "rev": "c1dfcf08411b08f6b8615f7d8971a2bfa81d5e8a",
         "type": "github"
       },
       "original": {
@@ -20,11 +20,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1725930920,
-        "narHash": "sha256-RVhD9hnlTT2nJzPHlAqrWqCkA7T6CYrP41IoVRkciZM=",
+        "lastModified": 1728193676,
+        "narHash": "sha256-PbDWAIjKJdlVg+qQRhzdSor04bAPApDqIv2DofTyynk=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "44a71ff39c182edaf25a7ace5c9454e7cba2c658",
+        "rev": "ecbc1ca8ffd6aea8372ad16be9ebbb39889e55b6",
         "type": "github"
       },
       "original": {
diff --git a/src/dged/json.c b/src/dged/json.c
index 70d406b..a8c3fed 100644
--- a/src/dged/json.c
+++ b/src/dged/json.c
@@ -322,6 +322,10 @@ uint64_t json_len(struct json_object *obj) {
   return HASHMAP_SIZE(&obj->members);
 }
 
+uint64_t json_empty(struct json_object *obj) {
+  return json_len(obj) == 0;
+}
+
 bool json_contains(struct json_object *obj, struct s8 key) {
   // TODO: get rid of alloc
   char *k = s8tocstr(key);
diff --git a/src/dged/json.h b/src/dged/json.h
index fdabae3..ced0f73 100644
--- a/src/dged/json.h
+++ b/src/dged/json.h
@@ -54,6 +54,15 @@ struct json_result json_parse(const uint8_t *buf, uint64_t size);
  */
 void json_destroy(struct json_value *value);
 
+/**
+ * Check if a JSON object is empty.
+ *
+ * @param [in] obj The JSON object to check if empty.
+ *
+ * @returns True if @ref obj is empty, false otherwise.
+ */
+void json_empty(struct json_object *obj);
+
 /**
  * Return the number of members in a JSON object.
  *
diff --git a/src/dged/jsonrpc.h b/src/dged/jsonrpc.h
new file mode 100644
index 0000000..ad2b0cc
--- /dev/null
+++ b/src/dged/jsonrpc.h
@@ -0,0 +1,32 @@
+#ifndef _JSONRPC_H
+#define _JSONRPC_H
+
+#include "json.h"
+#include "s8.h"
+
+struct jsonrpc_request {
+  struct json_value id;
+  struct s8 method;
+  struct json_object *params;
+};
+
+struct jsonrpc_response {
+  struct json_value id;
+  bool ok;
+  union {
+    struct json_value result;
+    struct jsonrpc_error error;
+  } value;
+};
+
+struct jsonrpc_error {
+  int code;
+  struct s8 message;
+  struct json_value data;
+};
+
+struct jsonrpc_request jsonrpc_request_create(struct s8 method, struct json_object *params);
+struct jsonrpc_response jsonrpc_parse_response(const uint8_t *buf, uint64_t size);
+struct s8 jsonrpc_request_to_string(const struct jsonprc_request *request);
+
+#endif