plugin_framework, support log callback

Signed-off-by: fufesou <shuanglongchen@yeah.net>

src/plugin/plog.rs

@@ -0,0 +1,34 @@
+use hbb_common::log;
+use std::ffi::c_char;
+
+const LOG_LEVEL_TRACE: &[u8; 6] = b"trace\0";
+const LOG_LEVEL_DEBUG: &[u8; 6] = b"debug\0";
+const LOG_LEVEL_INFO: &[u8; 5] = b"info\0";
+const LOG_LEVEL_WARN: &[u8; 5] = b"warn\0";
+const LOG_LEVEL_ERROR: &[u8; 6] = b"error\0";
+
+#[inline]
+fn is_level(level: *const c_char, level_bytes: &[u8]) -> bool {
+    level_bytes == unsafe { std::slice::from_raw_parts(level as *const u8, level_bytes.len()) }
+}
+
+#[no_mangle]
+pub(super) extern "C" fn log(level: *const c_char, msg: *const c_char) {
+    if level.is_null() || msg.is_null() {
+        return;
+    }
+
+    if let Ok(msg) = super::cstr_to_string(msg) {
+        if is_level(level, LOG_LEVEL_TRACE) {
+            log::trace!("{}", msg);
+        } else if is_level(level, LOG_LEVEL_DEBUG) {
+            log::debug!("{}", msg);
+        } else if is_level(level, LOG_LEVEL_INFO) {
+            log::info!("{}", msg);
+        } else if is_level(level, LOG_LEVEL_WARN) {
+            log::warn!("{}", msg);
+        } else if is_level(level, LOG_LEVEL_ERROR) {
+            log::error!("{}", msg);
+        }
+    }
+}