Add skeleton of implementation for backup remote source

datman/src/lib.rs

@@ -1,4 +1,5 @@
 pub mod commands;
 pub mod descriptor;
 pub mod labelling;
+pub mod remote;
 pub mod tree;

datman/src/remote.rs

@@ -0,0 +1,2 @@
+pub mod backup_source_requester;
+pub mod backup_source_responder;

datman/src/remote/backup_source_requester.rs

@@ -0,0 +1,65 @@
+use crate::tree::FileTree;
+use anyhow::bail;
+use std::io::{Read, Write};
+use std::path::Path;
+use std::sync::Arc;
+use yama::definitions::TreeNode;
+use yama::pile::RawPile;
+use yama::remote::responder::Responder;
+use yama::remote::{read_message, write_message};
+use yama::utils::get_number_of_workers;
+
+pub fn introduction<R: Read, W: Write>(read: &mut R, write: &mut W) -> anyhow::Result<()> {
+    let version = env!("CARGO_PKG_VERSION");
+    write_message(
+        write,
+        &format!("Datman v{} Backup Source Requester", version),
+    )?;
+
+    let foreign_side: String = read_message(read)?;
+    let expected_foreign_side = format!("Datman v{} Backup Source Responder", version);
+    if &foreign_side != &expected_foreign_side {
+        bail!(
+            "Datman version mismatch. Expected {:?}, got {:?}",
+            expected_foreign_side,
+            foreign_side
+        );
+    }
+
+    Ok(())
+}
+
+pub fn scanning<R: Read, W: Write>(
+    read: &mut R,
+    write: &mut W,
+    path: &Path,
+) -> anyhow::Result<Option<FileTree<(), (), (), ()>>> {
+    write_message(write, &path)?;
+    let scan_result: Option<FileTree<(), (), (), ()>> = read_message(read)?;
+
+    Ok(scan_result)
+}
+
+pub fn chunking<R: Read + Send + 'static, W: Write + Send + 'static, RP: RawPile + 'static>(
+    read: R,
+    mut write: W,
+    pointer_name: String,
+    tree_node: &TreeNode,
+    raw_pile: Arc<RP>,
+) -> anyhow::Result<()> {
+    write_message(&mut write, &pointer_name)?;
+    write_message(&mut write, tree_node)?;
+
+    let join_handles = Responder::start(
+        read,
+        write,
+        get_number_of_workers("YAMA_RESPONDERS") as u16,
+        raw_pile,
+    );
+
+    for handle in join_handles {
+        handle.join().expect("Join handle should not fail");
+    }
+
+    Ok(())
+}

datman/src/remote/backup_source_responder.rs

@@ -0,0 +1,84 @@
+// This file implements the responder side of the backup source protocol -- the protocol used
+// to connect to remote backup sources.
+
+use crate::tree::scan;
+use anyhow::bail;
+use std::io::{Read, Write};
+use std::path::PathBuf;
+use yama::definitions::TreeNode;
+use yama::pile::{Pile, RawPile};
+use yama::remote::requester::Requester;
+use yama::remote::{read_message, write_message};
+use yama::utils::get_number_of_workers;
+
+pub fn introduction<R: Read, W: Write>(read: &mut R, write: &mut W) -> anyhow::Result<()> {
+    let version = env!("CARGO_PKG_VERSION");
+    write_message(
+        write,
+        &format!("Datman v{} Backup Source Responder", version),
+    )?;
+
+    let foreign_side: String = read_message(read)?;
+    let expected_foreign_side = format!("Datman v{} Backup Source Requester", version);
+    if &foreign_side != &expected_foreign_side {
+        bail!(
+            "Datman version mismatch. Expected {:?}, got {:?}",
+            expected_foreign_side,
+            foreign_side
+        );
+    }
+
+    Ok(())
+}
+
+pub fn scanning<R: Read, W: Write>(read: &mut R, write: &mut W) -> anyhow::Result<PathBuf> {
+    let path: PathBuf = read_message(read)?;
+    let scan_result = scan(&path)?;
+    write_message(write, &scan_result)?;
+
+    Ok(path)
+}
+
+pub fn chunking<R: Read + Send + 'static, W: Write + Send + 'static>(
+    mut read: R,
+    write: W,
+    path: &PathBuf,
+) -> anyhow::Result<()> {
+    let pointer_name: String = read_message(&mut read)?;
+    let tree_node: TreeNode = read_message(&mut read)?;
+    let parent: Option<String> = read_message(&mut read)?;
+
+    let (yama_requester, requester_join_handles) = Requester::new(read, write);
+
+    let raw_pile: Box<dyn RawPile> = Box::new(yama_requester);
+
+    let pile = Pile::new(raw_pile);
+
+    yama::operations::storing::store_fully(
+        &pile,
+        path,
+        &pointer_name,
+        tree_node,
+        parent,
+        get_number_of_workers("YAMA_CHUNKERS"),
+    )?;
+
+    for join_handle in requester_join_handles {
+        join_handle.join().expect("Expected to join handle");
+    }
+
+    Ok(())
+}
+
+pub fn handler<R: Read + Send + 'static, W: Write + Send + 'static>(
+    mut read: R,
+    mut write: W,
+) -> anyhow::Result<()> {
+    introduction(&mut read, &mut write)?;
+
+    let path = scanning(&mut read, &mut write)?;
+
+    chunking(read, write, &path)?;
+
+    Ok(())
+}

yama/src/remote.rs

@@ -80,19 +80,14 @@ pub enum ResponseBody {
     },
 }
 
-pub fn read_message<R: Read + Send + 'static, D: DeserializeOwned + Send + 'static>(
-    read: &mut R,
-) -> anyhow::Result<D> {
+pub fn read_message<R: Read, D: DeserializeOwned>(read: &mut R) -> anyhow::Result<D> {
     let len = read.read_u32::<BigEndian>()?;
     let mut data_vec = vec![0u8; len as usize];
     read.read_exact(&mut data_vec)?;
     Ok(serde_bare::from_slice(&data_vec)?)
 }
 
-pub fn write_message<W: Write + Send + 'static, S: Serialize + Send + 'static>(
-    write: &mut W,
-    message: &S,
-) -> anyhow::Result<()> {
+pub fn write_message<W: Write, S: Serialize>(write: &mut W, message: &S) -> anyhow::Result<()> {
     let data_vec = serde_bare::to_vec(&message)?;
     write.write_u32::<BigEndian>(data_vec.len().try_into()?)?;
     write.write_all(&data_vec)?;