introduce DC_EVENT_NEW_BLOB_FILE event and test for it

src/context.rs

@@ -208,7 +208,9 @@ impl Context {
                 .open(&path)
             {
                 file.write_all(data)?;
-                return Ok(format!("$BLOBDIR/{}", candidate_basename));
+                let db_entry = format!("$BLOBDIR/{}", candidate_basename);
+                self.call_cb(Event::NewBlobFile(db_entry.clone()));
+                return Ok(db_entry);
             }
         }
         bail!("out of luck to create new blob file");

src/events.rs

@@ -54,6 +54,12 @@ pub enum Event {
     #[strum(props(id = "105"))]
     ImapMessageMoved(String),
 
+    /// Emitted when an new file in the $BLOBDIR was created
+    ///
+    /// @return 0
+    #[strum(props(id = "150"))]
+    NewBlobFile(String),
+
     /// The library-user should write a warning string to the log.
     /// Passed to the callback given to dc_context_new().
     ///

src/job.rs

@@ -947,7 +947,6 @@ fn add_smtp_job(context: &Context, action: Action, mimefactory: &MimeFactory) ->
         )
     };
     let bpath = context.new_blob_file(&mimefactory.rfc724_mid, bytes)?;
-    info!(context, "add_smtp_job file written: {:?}", bpath);
     let recipients = mimefactory.recipients_addr.join("\x1e");
     param.set(Param::File, &bpath);
     param.set(Param::Recipients, &recipients);