node: Start working on git-fetch

Signed-off-by: Alexis Sellier <self@cloudhead.io>

node/src/git.rs

@@ -0,0 +1,24 @@
+use std::net;
+
+use crate::identity::ProjId;
+use crate::storage::{Error, WriteStorage};
+
+/// Default port of the `git` transport protocol.
+pub const PROTOCOL_PORT: u16 = 9418;
+
+pub fn fetch<S: WriteStorage>(
+    _proj: &ProjId,
+    remote: &net::SocketAddr,
+    mut storage: S,
+) -> Result<(), Error> {
+    let _repo = storage.repository();
+
+    let url = format!("git://{}", remote);
+    let refs: &[&str] = &[];
+    let mut remote = git2::Remote::create_detached(&url)?;
+    let mut opts = git2::FetchOptions::default();
+
+    remote.fetch(refs, Some(&mut opts), None)?;
+
+    Ok(())
+}

node/src/lib.rs

@@ -6,6 +6,7 @@ mod address_manager;
 mod clock;
 mod collections;
 mod decoder;
+mod git;
 mod hash;
 mod identity;
 mod logger;

node/src/protocol.rs

@@ -15,6 +15,7 @@ use crate::address_manager::AddressManager;
 use crate::clock::RefClock;
 use crate::collections::{HashMap, HashSet};
 use crate::decoder::Decoder;
+use crate::git;
 use crate::identity::{ProjId, UserId};
 use crate::storage;
 use crate::storage::{Inventory, ReadStorage, Remotes, Unverified, WriteStorage};
@@ -38,6 +39,7 @@ pub const MAX_CONNECTION_ATTEMPTS: usize = 3;
 #[derive(Debug)]
 pub enum Command {
     Connect(net::SocketAddr),
+    Fetch(ProjId, net::SocketAddr),
 }
 
 /// Message envelope. All messages sent over the network are wrapped in this type.
@@ -351,7 +353,7 @@ impl<T: ReadStorage + WriteStorage, S: address_book::Store> Protocol<S, T> {
 
 impl<S, T> nakamoto::Protocol for Protocol<S, T>
 where
-    T: ReadStorage + WriteStorage,
+    T: ReadStorage + WriteStorage + 'static,
     S: address_book::Store,
 {
     type Event = ();
@@ -416,6 +418,9 @@ where
 
         match cmd {
             Command::Connect(addr) => self.context.connect(addr),
+            Command::Fetch(proj, remote) => {
+                git::fetch(&proj, &remote, &mut self.storage).unwrap();
+            }
         }
     }
 

node/src/storage.rs

@@ -1,7 +1,7 @@
 use std::marker::PhantomData;
 use std::ops::{Deref, DerefMut};
 use std::path::Path;
-use std::{fmt, fs, io, net};
+use std::{fmt, fs, io};
 
 use git_ref_format::refspec;
 use once_cell::sync::Lazy;
@@ -100,8 +100,7 @@ pub trait ReadStorage {
 }
 
 pub trait WriteStorage {
-    /// Fetch a project from a remote peer.
-    fn fetch(&mut self, proj: &ProjId, remote: &net::SocketAddr) -> Result<(), Error>;
+    fn repository(&mut self) -> &mut git2::Repository;
 }
 
 impl<T, S> ReadStorage for T
@@ -121,10 +120,10 @@ where
 impl<T, S> WriteStorage for T
 where
     T: DerefMut<Target = S>,
-    S: WriteStorage,
+    S: WriteStorage + 'static,
 {
-    fn fetch(&mut self, proj: &ProjId, remote: &net::SocketAddr) -> Result<(), Error> {
-        self.deref_mut().fetch(proj, remote)
+    fn repository(&mut self) -> &mut git2::Repository {
+        self.deref_mut().repository()
     }
 }
 
@@ -159,8 +158,8 @@ impl ReadStorage for Storage {
 }
 
 impl WriteStorage for Storage {
-    fn fetch(&mut self, _id: &ProjId, _remote: &net::SocketAddr) -> Result<(), Error> {
-        todo!()
+    fn repository(&mut self) -> &mut git2::Repository {
+        &mut self.backend
     }
 }
 

node/src/test/peer.rs

@@ -57,7 +57,7 @@ impl<S> DerefMut for Peer<S> {
 
 impl<S> Peer<S>
 where
-    S: ReadStorage + WriteStorage,
+    S: ReadStorage + WriteStorage + 'static,
 {
     pub fn new(name: &'static str, ip: impl Into<net::IpAddr>, storage: S) -> Self {
         Self::config(

node/src/test/storage.rs

@@ -1,5 +1,3 @@
-use std::net;
-
 use crate::identity::ProjId;
 use crate::storage::{Error, Inventory, ReadStorage, Remotes, Unverified, WriteStorage};
 
@@ -40,7 +38,7 @@ impl ReadStorage for MockStorage {
 }
 
 impl WriteStorage for MockStorage {
-    fn fetch(&mut self, _proj: &ProjId, _remote: &net::SocketAddr) -> Result<(), Error> {
+    fn repository(&mut self) -> &mut git2::Repository {
         todo!()
     }
 }