expose ndb_note_json

Fixes: #12
Changelog-Added: Add Note::json for json conversion

src/bindings.rs

@@ -2663,6 +2663,8 @@ pub type ndb_id_fn = ::std::option::Option<
         arg2: *const ::std::os::raw::c_char,
     ) -> ndb_idres,
 >;
+pub type ndb_sub_fn =
+    ::std::option::Option<unsafe extern "C" fn(arg1: *mut ::std::os::raw::c_void, subid: u64)>;
 #[repr(C)]
 #[derive(Debug, Copy, Clone)]
 pub struct ndb_id_cb {
@@ -3538,14 +3540,16 @@ pub struct ndb_config {
     pub mapsize: usize,
     pub filter_context: *mut ::std::os::raw::c_void,
     pub ingest_filter: ndb_ingest_filter_fn,
+    pub sub_cb_ctx: *mut ::std::os::raw::c_void,
+    pub sub_cb: ndb_sub_fn,
 }
 #[test]
 fn bindgen_test_layout_ndb_config() {
     const UNINIT: ::std::mem::MaybeUninit<ndb_config> = ::std::mem::MaybeUninit::uninit();
     let ptr = UNINIT.as_ptr();
     assert_eq!(
         ::std::mem::size_of::<ndb_config>(),
-        32usize,
+        48usize,
         concat!("Size of: ", stringify!(ndb_config))
     );
     assert_eq!(
@@ -3603,6 +3607,26 @@ fn bindgen_test_layout_ndb_config() {
             stringify!(ingest_filter)
         )
     );
+    assert_eq!(
+        unsafe { ::std::ptr::addr_of!((*ptr).sub_cb_ctx) as usize - ptr as usize },
+        32usize,
+        concat!(
+            "Offset of field: ",
+            stringify!(ndb_config),
+            "::",
+            stringify!(sub_cb_ctx)
+        )
+    );
+    assert_eq!(
+        unsafe { ::std::ptr::addr_of!((*ptr).sub_cb) as usize - ptr as usize },
+        40usize,
+        concat!(
+            "Offset of field: ",
+            stringify!(ndb_config),
+            "::",
+            stringify!(sub_cb)
+        )
+    );
 }
 #[repr(C)]
 #[derive(Debug, Copy, Clone)]
@@ -4794,6 +4818,13 @@ extern "C" {
         arg1: *mut ::std::os::raw::c_void,
     );
 }
+extern "C" {
+    pub fn ndb_config_set_subscription_callback(
+        config: *mut ndb_config,
+        fn_: ndb_sub_fn,
+        ctx: *mut ::std::os::raw::c_void,
+    );
+}
 extern "C" {
     pub fn ndb_calculate_id(
         note: *mut ndb_note,
@@ -5097,7 +5128,10 @@ extern "C" {
     ) -> ::std::os::raw::c_int;
 }
 extern "C" {
-    pub fn ndb_unsubscribe(subid: ::std::os::raw::c_int) -> ::std::os::raw::c_int;
+    pub fn ndb_unsubscribe(arg1: *mut ndb, subid: u64) -> ::std::os::raw::c_int;
+}
+extern "C" {
+    pub fn ndb_num_subscriptions(arg1: *mut ndb) -> ::std::os::raw::c_int;
 }
 extern "C" {
     pub fn ndb_text_search(
@@ -5171,6 +5205,14 @@ extern "C" {
 extern "C" {
     pub fn ndb_str_len(str_: *mut ndb_str) -> ::std::os::raw::c_int;
 }
+extern "C" {
+    #[doc = " write the note as json to a buffer"]
+    pub fn ndb_note_json(
+        arg1: *mut ndb_note,
+        buf: *mut ::std::os::raw::c_char,
+        buflen: ::std::os::raw::c_int,
+    ) -> ::std::os::raw::c_int;
+}
 extern "C" {
     pub fn ndb_tags_iterate_start(note: *mut ndb_note, iter: *mut ndb_iterator);
 }

src/config.rs

@@ -14,6 +14,8 @@ impl Config {
     pub fn new() -> Self {
         let mut config = bindings::ndb_config {
             filter_context: std::ptr::null_mut(),
+            sub_cb: None,
+            sub_cb_ctx: std::ptr::null_mut(),
             ingest_filter: None,
             flags: 0,
             ingester_threads: 0,

src/error.rs

@@ -9,6 +9,7 @@ pub enum Error {
     NoteProcessFailed,
     TransactionFailed,
     SubscriptionError,
+    BufferOverflow,
 }
 
 impl fmt::Display for Error {
@@ -21,6 +22,7 @@ impl fmt::Display for Error {
             Error::NoteProcessFailed => "Note process failed",
             Error::TransactionFailed => "Transaction failed",
             Error::SubscriptionError => "Subscription failed",
+            Error::BufferOverflow => "Buffer overflow",
         };
         write!(f, "{}", s)
     }

src/note.rs

@@ -1,6 +1,6 @@
-use crate::bindings;
 use crate::tags::Tags;
 use crate::transaction::Transaction;
+use crate::{bindings, Error};
 use ::std::os::raw::c_uchar;
 use std::hash::Hash;
 
@@ -127,11 +127,30 @@ impl<'a> Note<'a> {
         }
     }
 
-    /*
-    pub fn json() -> String {
-        unsafe { bindings::ndb_note_json() }
+    pub fn json_with_bufsize(&self, bufsize: usize) -> Result<String, Error> {
+        let mut buf = Vec::with_capacity(bufsize);
+        unsafe {
+            let size = bindings::ndb_note_json(
+                self.as_ptr(),
+                buf.as_mut_ptr() as *mut ::std::os::raw::c_char,
+                bufsize as ::std::os::raw::c_int,
+            ) as usize;
+
+            // Step 4: Check the return value for success
+            if size == 0 {
+                return Err(Error::BufferOverflow); // Handle the error appropriately
+            }
+
+            buf.set_len(size);
+
+            Ok(std::str::from_utf8_unchecked(&buf[..size - 1]).to_string())
+        }
+    }
+
+    pub fn json(&self) -> Result<String, Error> {
+        // 1mb buffer
+        self.json_with_bufsize(1024usize * 1024usize)
     }
-    */
 
     fn content_size(&self) -> usize {
         unsafe { bindings::ndb_note_content_length(self.as_ptr()) as usize }
@@ -506,5 +525,9 @@ mod tests {
             assert_eq!(tag.get_unchecked(1).variant().str().unwrap(), "something");
             break;
         }
+
+        let json = note.json().expect("note json");
+        // the signature changes so 267 is everything up until the signature
+        assert_eq!(&json[..267], "{\"id\":\"fb165be22c7b2518b749aabb7140c73f0887fe84475c82785700663be85ba859\",\"pubkey\":\"6c540ed060bfc2b0c5b6f09cd3ebedf980ef7bc836d69582361d20f2ad124f23\",\"created_at\":42,\"kind\":1,\"tags\":[[\"comment\",\"this is a comment\"],[\"blah\",\"something\"]],\"content\":\"this is the content\"");
     }
 }