feat: propagate log from flutter to rust backend (#1723)

* feat: draft commit for getting guidance on send log to backend issue

* feat: modify according to guidance

* feat: add tracing dependencies

* feat: continue implement for sending log to backend

* fix: compile errors

* feat: remove un-necessary code

---------

Co-authored-by: nathan <nathan@appflowy.io>

frontend/rust-lib/dart-ffi/Cargo.toml

@@ -23,6 +23,8 @@ bytes = { version = "1.0" }
 crossbeam-utils = "0.8.7"
 lazy_static = "1.4.0"
 parking_lot = "0.12.1"
+tracing = { version = "0.1", features = ["log"] }
+
 
 lib-dispatch = { path = "../lib-dispatch" }
 flowy-core = { path = "../flowy-core" }

frontend/rust-lib/dart-ffi/binding.h

@@ -11,4 +11,6 @@ const uint8_t *sync_event(const uint8_t *input, uintptr_t len);
 
 int32_t set_stream_port(int64_t port);
 
-void link_me_please(void);
+void link_me_please(void);
+
+void backend_log(int64_t level, const char *data);

frontend/rust-lib/dart-ffi/src/lib.rs

@@ -111,3 +111,19 @@ async fn post_to_flutter(response: AFPluginEventResponse, port: i64) {
         }
     }
 }
+
+#[no_mangle]
+pub extern "C" fn backend_log(level: i64, data: *const c_char) {
+    let c_str = unsafe { CStr::from_ptr(data) };
+    let log_str = c_str.to_str().unwrap();
+
+    // Don't change the mapping relation between number and level
+    match level {
+        0 => tracing::info!("{}", log_str),
+        1 => tracing::debug!("{}", log_str),
+        2 => tracing::trace!("{}", log_str),
+        3 => tracing::warn!("{}", log_str),
+        4 => tracing::error!("{}", log_str),
+        _ => (),
+    }
+}