Write `get-file` and commands to get the list of blocks from another node

Description

This closes #1 (closed) by providing an API that allows to get a file with just its hash

Detailed list of changes

• add get_file, get_blocks_info_from and other things related to managing the filesystem
• add new commands to nu API
• remove DragoonBehaviour as it was not useful
• add two new tests for get_file and change the already existing test to use the new API

Note

The get_file is still very rough, the error management needs to be handled better to take into a lot more cases of failure

src/dragoon_network.rs

@@ -618,25 +618,27 @@ impl DragoonNetwork {
             } => {
                 info!("Starting to get the file {}", file_hash);
                 let cmd_sender = self.command_sender.clone();
-                let res = Self::get_file::<F, G, P>(
-                    cmd_sender,
-                    file_hash.clone(),
-                    output_filename,
-                    powers_path,
-                )
-                .await
-                .map_err(|err| err.into());
-                if match sender {
-                    Sender::SenderMPSC(sender) => sender.send(res).map_err(|_| format_err!("")),
-                    Sender::SenderOneS(sender) => sender.send(res).map_err(|_| format_err!("")),
-                }
-                .is_err()
-                {
-                    error!(
-                        "Could not send the result of the get_file {} operation",
-                        file_hash
+                tokio::spawn(async move {
+                    let res = Self::get_file::<F, G, P>(
+                        cmd_sender,
+                        file_hash.clone(),
+                        output_filename,
+                        powers_path,
                     )
-                }
+                    .await
+                    .map_err(|err| err.into());
+                    if match sender {
+                        Sender::SenderMPSC(sender) => sender.send(res).map_err(|_| format_err!("")),
+                        Sender::SenderOneS(sender) => sender.send(res).map_err(|_| format_err!("")),
+                    }
+                    .is_err()
+                    {
+                        error!(
+                            "Could not send the result of the get_file {} operation",
+                            file_hash
+                        )
+                    }
+                });
             }
             DragoonCommand::Dial { multiaddr, sender } => {
                 let res = self.dial(multiaddr).await.map_err(|err| err.into());