diff --git a/services/backup/blob_client/src/put_client.rs b/services/backup/blob_client/src/put_client.rs
index 466fbb91b..597e4f790 100644
--- a/services/backup/blob_client/src/put_client.rs
+++ b/services/backup/blob_client/src/put_client.rs
@@ -1,197 +1,218 @@
 mod proto {
   tonic::include_proto!("blob");
 }
 
 use proto::blob_service_client::BlobServiceClient;
 use proto::put_request;
 use proto::put_request::Data::*;
 use proto::PutRequest;
 
 use crate::constants::{BLOB_ADDRESS, MPSC_CHANNEL_BUFFER_CAPACITY};
 use lazy_static::lazy_static;
 use libc;
 use libc::c_char;
 use std::ffi::CStr;
 use std::sync::{Arc, Mutex};
 use tokio::runtime::Runtime;
 use tokio::sync::mpsc;
 use tokio::task::JoinHandle;
 use tracing::error;
 
 #[derive(Debug)]
 struct PutRequestData {
   field_index: usize,
   data: Vec<u8>,
 }
 
 struct BidiClient {
   tx: mpsc::Sender<PutRequestData>,
 
   rx: mpsc::Receiver<String>,
   rx_handle: JoinHandle<()>,
 }
 
 lazy_static! {
   static ref CLIENT: Arc<Mutex<Option<BidiClient>>> =
     Arc::new(Mutex::new(None));
   static ref RUNTIME: Runtime = Runtime::new().unwrap();
   static ref ERROR_MESSAGES: Arc<Mutex<Vec<String>>> =
     Arc::new(Mutex::new(Vec::new()));
 }
 
 fn is_initialized() -> bool {
   match CLIENT.lock() {
     Ok(client) => client.is_some(),
     _ => {
       report_error("couldn't access client".to_string());
       false
     }
   }
 }
 
 fn report_error(message: String) {
   println!("[RUST] [put] Error: {}", message);
   if let Ok(mut error_messages) = ERROR_MESSAGES.lock() {
     error_messages.push(message);
     return;
   }
   error!("could not access error messages");
 }
 
 fn check_error() -> Result<(), String> {
   if let Ok(errors) = ERROR_MESSAGES.lock() {
     return match errors.is_empty() {
       true => Ok(()),
       false => Err(errors.join("\n")),
     };
   }
   Err("could not access error messages".to_string())
 }
 
 pub fn put_client_initialize_cxx() -> Result<(), String> {
   if is_initialized() {
     put_client_terminate_cxx()?;
   }
   assert!(!is_initialized(), "client cannot be initialized twice");
   // grpc
   if let Ok(mut grpc_client) =
     RUNTIME.block_on(async { BlobServiceClient::connect(BLOB_ADDRESS).await })
   {
     let (request_thread_tx, mut request_thread_rx) =
       mpsc::channel::<PutRequestData>(MPSC_CHANNEL_BUFFER_CAPACITY);
 
     let outbound = async_stream::stream! {
       while let Some(data) = request_thread_rx.recv().await {
         let request_data: Option<put_request::Data> = match data.field_index {
           1 => {
             match String::from_utf8(data.data) {
               Ok(utf8_data) => Some(Holder(utf8_data)),
               _ => {
                 report_error("invalid utf-8".to_string());
                 None
               },
             }
           }
           2 => {
             match String::from_utf8(data.data).ok() {
               Some(utf8_data) => Some(BlobHash(utf8_data)),
               None => {
                 report_error("invalid utf-8".to_string());
                 None
               },
             }
           }
           3 => {
             Some(DataChunk(data.data))
           }
           _ => {
             report_error(format!("invalid field index value {}", data.field_index));
             None
           }
         };
         if let Some (unpacked_data) = request_data {
           let request = PutRequest {
             data: Some(unpacked_data),
           };
           yield request;
         } else {
           report_error("an error occured, aborting connection".to_string());
           break;
         }
       }
     };
 
     // spawn receiver thread
     let (response_thread_tx, response_thread_rx) =
       mpsc::channel::<String>(MPSC_CHANNEL_BUFFER_CAPACITY);
     let rx_handle = RUNTIME.spawn(async move {
       match grpc_client.put(tonic::Request::new(outbound)).await {
         Ok(response) => {
           let mut inner_response = response.into_inner();
           loop {
             match inner_response.message().await {
               Ok(maybe_response_message) => {
                 let mut result = false;
                 if let Some(response_message) = maybe_response_message {
                   // warning: this will produce an error if there's more unread responses than
                   // MPSC_CHANNEL_BUFFER_CAPACITY
                   // you should then use put_client_blocking_read_cxx in order to dequeue
                   // the responses in c++ and make room for more
                   if let Ok(_) = response_thread_tx
                     .try_send((response_message.data_exists as i32).to_string())
                   {
                     result = true;
                   } else {
                     report_error("response queue full".to_string());
                   }
                 }
                 if !result {
                   break;
                 }
               }
               Err(err) => {
                 report_error(err.to_string());
                 break;
               }
             };
           }
         }
         Err(err) => {
           report_error(err.to_string());
         }
       };
     });
 
     if let Ok(mut client) = CLIENT.lock() {
       *client = Some(BidiClient {
         tx: request_thread_tx,
         rx: response_thread_rx,
         rx_handle,
       });
       return Ok(());
     }
     return Err("could not access client".to_string());
   }
   Err("could not successfully connect to the blob server".to_string())
 }
 
 pub fn put_client_blocking_read_cxx() -> Result<String, String> {
-  unimplemented!();
+  check_error()?;
+  let response: Option<String> = RUNTIME.block_on(async {
+    if let Ok(mut maybe_client) = CLIENT.lock() {
+      if let Some(mut client) = (*maybe_client).take() {
+        if let Some(data) = client.rx.recv().await {
+          return Some(data);
+        } else {
+          report_error(
+            "couldn't receive data via client's receiver".to_string(),
+          );
+        }
+        *maybe_client = Some(client);
+      } else {
+        report_error("no client detected".to_string());
+      }
+    } else {
+      report_error("couldn't access client".to_string());
+    }
+    None
+  });
+  check_error()?;
+  response.ok_or("response not received properly".to_string())
 }
 
 /**
  * field index:
  * 1 - holder (utf8 string)
  * 2 - blob hash (utf8 string)
  * 3 - data chunk (bytes)
  */
 pub fn put_client_write_cxx(
   field_index: usize,
   data: *const c_char,
 ) -> Result<(), String> {
   unimplemented!();
 }
 
 pub fn put_client_terminate_cxx() -> Result<(), String> {
   unimplemented!();
 }