feat: Abstract Git command execution into injectable enum

Closes kemitix/git-next#36

src/main.rs

@@ -4,6 +4,8 @@ mod server;
 use clap::Parser;
 use kxio::{filesystem, network::Network};
 
+use crate::server::git::Git;
+
 #[derive(Parser, Debug)]
 #[clap(version = clap::crate_version!(), author = clap::crate_authors!(), about = clap::crate_description!())]
 struct Commands {
@@ -26,6 +28,7 @@ enum Server {
 async fn main() {
     let fs = filesystem::FileSystem::new_real(None);
     let net = Network::new_real();
+    let git = Git::new_real();
     let commands = Commands::parse();
 
     match commands.command {
@@ -37,7 +40,7 @@ async fn main() {
                 server::init(fs);
             }
             Server::Start => {
-                server::start(fs, net).await;
+                server::start(fs, net, git).await;
             }
         },
     }

src/server/actors/repo/branch.rs

@@ -1,16 +1,9 @@
-use std::fmt::Display;
-
 use actix::prelude::*;
 
 use kxio::network;
-use secrecy::ExposeSecret;
 use tracing::{error, info, warn};
 
-use crate::server::{
-    actors::repo::{branch, ValidateRepo},
-    config::{self, BranchName},
-    forge,
-};
+use crate::server::{actors::repo::ValidateRepo, config, forge, git::Git, types::ResetForce};
 
 use super::{RepoActor, StartMonitoring};
 
@@ -19,6 +12,7 @@ pub async fn validate_positions(
     repo_details: config::RepoDetails,
     config: config::RepoConfig,
     addr: Addr<RepoActor>,
+    git: Git,
     net: network::Network,
 ) {
     let commit_histories = match repo_details.forge.forge_type {
@@ -45,13 +39,15 @@ pub async fn validate_positions(
     let next_is_ancestor_of_dev = commit_histories.dev.iter().any(|dev| dev == &next);
     if !next_is_ancestor_of_dev {
         info!("Next is not an ancestor of dev - resetting next to main");
-        if branch::reset(
-            &config.branches().next(),
-            main,
-            ResetForce::Force(next.into()),
-            &repo_details,
-        )
-        .is_ok()
+
+        if git
+            .reset(
+                &config.branches().next(),
+                main.into(),
+                ResetForce::Force(next.into()),
+                &repo_details,
+            )
+            .is_ok()
         {
             // TODO : (#18) sleep and restart while we don't have webhooks
             tokio::time::sleep(std::time::Duration::from_secs(10)).await;
@@ -118,6 +114,7 @@ pub async fn advance_next(
     repo_details: config::RepoDetails,
     repo_config: config::RepoConfig,
     addr: Addr<RepoActor>,
+    git: Git,
 ) {
     let next_commit = find_next_commit_on_dev(next, dev_commit_history);
     let Some(commit) = next_commit else {
@@ -129,9 +126,9 @@ pub async fn advance_next(
         return;
     }
     info!("Advancing next to commit '{}'", commit);
-    match reset(
+    match git.reset(
         &repo_config.branches().next(),
-        commit,
+        commit.into(),
         ResetForce::None,
         &repo_details,
     ) {
@@ -184,11 +181,12 @@ pub async fn advance_main(
     next: forge::Commit,
     repo_details: config::RepoDetails,
     repo_config: config::RepoConfig,
+    git: Git,
 ) {
     info!("Advancing main to next");
-    match reset(
+    match git.reset(
         &repo_config.branches().main(),
-        next,
+        next.into(),
         ResetForce::None,
         &repo_details,
     ) {
@@ -201,75 +199,6 @@ pub async fn advance_main(
     };
 }
 
-#[derive(Clone, Debug)]
-pub struct GitRef(pub String);
-impl From<forge::Commit> for GitRef {
-    fn from(value: forge::Commit) -> Self {
-        Self(value.sha().to_string())
-    }
-}
-impl From<BranchName> for GitRef {
-    fn from(value: BranchName) -> Self {
-        Self(value.0)
-    }
-}
-impl Display for GitRef {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(f, "{}", self.0)
-    }
-}
-
-#[derive(Debug)]
-pub enum ResetForce {
-    None,
-    Force(GitRef),
-}
-impl Display for ResetForce {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(f, "{:?}", self)
-    }
-}
-pub fn reset(
-    branch: &BranchName,
-    gitref: impl Into<GitRef>,
-    reset_force: ResetForce,
-    repo_details: &config::RepoDetails,
-) -> Result<(), std::io::Error> {
-    let gitref: GitRef = gitref.into();
-    let user = &repo_details.forge.user;
-
-    let hostname = &repo_details.forge.hostname;
-    let path = &repo_details.repo;
-    let token = &repo_details.forge.token.expose_secret();
-    let origin = format!("https://{user}:{token}@{hostname}/{path}.git");
-    let force = match reset_force {
-        ResetForce::None => "".to_string(),
-        ResetForce::Force(old_ref) => format!("--force-with-lease={branch}:{old_ref}"),
-    };
-    // INFO: never log the command as it contains the API token
-    let command = format!("/usr/bin/git push {origin} {gitref}:{branch} {force}");
-    drop(origin);
-    info!("Resetting {branch} to {gitref}");
-    match gix::command::prepare(command)
-        .with_shell_allow_argument_splitting()
-        .stdout(std::process::Stdio::null())
-        .stderr(std::process::Stdio::null())
-        .spawn()
-    {
-        Ok(mut child) => match child.wait() {
-            Ok(_) => Ok(()),
-            Err(err) => {
-                warn!(?err, "Advance Next Failed (wait)");
-                Err(err)
-            }
-        },
-        Err(err) => {
-            warn!(?err, "Advance Next Failed (spawn)");
-            Err(err)
-        }
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;

src/server/actors/repo/mod.rs

@@ -10,6 +10,7 @@ use tracing::{info, warn};
 use crate::server::{
     config::{RepoConfig, RepoDetails},
     forge,
+    git::Git,
 };
 
 use self::webhook::WebhookId;
@@ -19,14 +20,16 @@ pub struct RepoActor {
     config: Option<RepoConfig>, // INFO: if [None] then send [StartRepo] to populate it
     webhook_id: Option<WebhookId>, // INFO: if [None] then no webhook is configured
     net: Network,
+    git: Git,
 }
 impl RepoActor {
-    pub(crate) const fn new(details: RepoDetails, net: Network) -> Self {
+    pub(crate) const fn new(details: RepoDetails, net: Network, git: Git) -> Self {
         Self {
             details,
             config: None,
             webhook_id: None,
             net,
+            git,
         }
     }
 }
@@ -85,7 +88,8 @@ impl Handler<ValidateRepo> for RepoActor {
             let repo_details = self.details.clone();
             let addr = ctx.address();
             let net = self.net.clone();
-            branch::validate_positions(repo_details, repo_config, addr, net)
+            let git = self.git.clone();
+            branch::validate_positions(repo_details, repo_config, addr, git, net)
                 .into_actor(self)
                 .wait(ctx);
         }
@@ -115,6 +119,7 @@ impl Handler<StartMonitoring> for RepoActor {
         let repo_details = self.details.clone();
         let addr = ctx.address();
         let net = self.net.clone();
+        let git = self.git.clone();
 
         if next_ahead_of_main {
             status::check_next(msg.next, repo_details, addr, net)
@@ -127,6 +132,7 @@ impl Handler<StartMonitoring> for RepoActor {
                 repo_details,
                 repo_config,
                 addr,
+                git,
             )
             .into_actor(self)
             .wait(ctx);
@@ -159,7 +165,8 @@ impl Handler<AdvanceMainTo> for RepoActor {
             warn!("No config loaded");
             return;
         };
-        branch::advance_main(msg.0, repo_details, repo_config)
+        let git = self.git.clone();
+        branch::advance_main(msg.0, repo_details, repo_config, git)
             .into_actor(self)
             .wait(ctx);
     }

src/server/config.rs

@@ -205,7 +205,7 @@ impl Display for RepoPath {
         write!(f, "{}", self.0)
     }
 }
-#[derive(Clone, Debug, PartialEq, Eq)]
+#[derive(Clone, Debug, Hash, PartialEq, Eq)]
 pub struct BranchName(pub String);
 impl Display for BranchName {
     fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {

src/server/git/mock.rs

@@ -0,0 +1,47 @@
+use std::collections::HashMap;
+
+use crate::server::{
+    config::{BranchName, RepoDetails},
+    git::GitResetResult,
+    types::{GitRef, ResetForce},
+};
+
+#[derive(Clone)]
+pub struct MockGit {
+    reset: HashMap<(BranchName, GitRef), GitResetResult>,
+}
+impl MockGit {
+    pub(super) fn new() -> Self {
+        Self {
+            reset: HashMap::new(),
+        }
+    }
+    #[allow(dead_code)] // TODO: (#38) Add tests
+    pub const fn into_git(self) -> super::Git {
+        super::Git::Mock(self)
+    }
+
+    #[allow(dead_code)] // TODO: (#38) Add tests
+    pub fn expect_reset_result(
+        &mut self,
+        branch_name: &BranchName,
+        gitref: &GitRef,
+        result: GitResetResult,
+    ) {
+        self.reset
+            .insert((branch_name.clone(), gitref.clone()), result);
+    }
+}
+impl super::GitLike for MockGit {
+    fn reset(
+        &self,
+        branch: &BranchName,
+        gitref: GitRef,
+        _reset_force: ResetForce,
+        _repo_details: &RepoDetails,
+    ) -> GitResetResult {
+        self.reset
+            .get(&(branch.clone(), gitref.clone()))
+            .map_or_else(|| panic!("unexpected: {} to {}", branch, gitref), |r| *r)
+    }
+}

src/server/git/mod.rs

@@ -0,0 +1,48 @@
+use std::ops::Deref;
+
+use crate::server::{
+    config::{BranchName, RepoDetails},
+    git::{mock::MockGit, real::RealGit},
+    types::{GitRef, ResetForce},
+};
+
+mod mock;
+mod real;
+
+#[derive(Clone)]
+pub enum Git {
+    Real(RealGit),
+    #[allow(dead_code)] // TODO: (#38) Add tests
+    Mock(MockGit),
+}
+impl Git {
+    pub const fn new_real() -> Self {
+        Self::Real(RealGit::new())
+    }
+    #[allow(dead_code)] // TODO: (#38) Add tests
+    pub fn new_mock() -> MockGit {
+        MockGit::new()
+    }
+}
+impl Deref for Git {
+    type Target = dyn GitLike;
+
+    fn deref(&self) -> &Self::Target {
+        match self {
+            Self::Real(git) => git,
+            Self::Mock(git) => git,
+        }
+    }
+}
+
+pub trait GitLike: Sync + Send {
+    fn reset(
+        &self,
+        branch: &BranchName,
+        gitref: GitRef,
+        reset_force: ResetForce,
+        repo_details: &RepoDetails,
+    ) -> GitResetResult;
+}
+
+pub type GitResetResult = Result<(), ()>;

src/server/git/real.rs

@@ -0,0 +1,57 @@
+use secrecy::ExposeSecret;
+use tracing::{info, warn};
+
+use crate::server::{
+    config::{BranchName, RepoDetails},
+    git::GitResetResult,
+    types::{GitRef, ResetForce},
+};
+
+#[derive(Clone)]
+pub struct RealGit;
+impl RealGit {
+    pub(super) const fn new() -> Self {
+        Self
+    }
+}
+impl super::GitLike for RealGit {
+    fn reset(
+        &self,
+        branch: &BranchName,
+        gitref: GitRef,
+        reset_force: ResetForce,
+        repo_details: &RepoDetails,
+    ) -> GitResetResult {
+        let user = &repo_details.forge.user;
+        let hostname = &repo_details.forge.hostname;
+        let path = &repo_details.repo;
+        let token = &repo_details.forge.token.expose_secret();
+        let origin = format!("https://{user}:{token}@{hostname}/{path}.git");
+        let force = match reset_force {
+            ResetForce::None => "".to_string(),
+            ResetForce::Force(old_ref) => format!("--force-with-lease={branch}:{old_ref}"),
+        };
+        // INFO: never log the command as it contains the API token
+        let command = format!("/usr/bin/git push {origin} {gitref}:{branch} {force}");
+        drop(origin);
+        info!("Resetting {branch} to {gitref}");
+        match gix::command::prepare(command)
+            .with_shell_allow_argument_splitting()
+            .stdout(std::process::Stdio::null())
+            .stderr(std::process::Stdio::null())
+            .spawn()
+        {
+            Ok(mut child) => match child.wait() {
+                Ok(_) => Ok(()),
+                Err(err) => {
+                    warn!(?err, "Failed (wait)");
+                    Err(())
+                }
+            },
+            Err(err) => {
+                warn!(?err, "Failed (spawn)");
+                Err(())
+            }
+        }
+    }
+}

src/server/mod.rs

@@ -1,6 +1,8 @@
 mod actors;
 mod config;
 pub mod forge;
+pub mod git;
+pub mod types;
 
 use actix::prelude::*;
 use kxio::network::Network;
@@ -11,7 +13,10 @@ use tracing::{error, info, level_filters::LevelFilter};
 
 use crate::{
     filesystem::FileSystem,
-    server::config::{Forge, ForgeName, RepoName},
+    server::{
+        config::{Forge, ForgeName, RepoName},
+        git::Git,
+    },
 };
 
 use self::{actors::repo::RepoActor, config::Repo};
@@ -34,7 +39,7 @@ pub fn init(fs: FileSystem) {
     }
 }
 
-pub async fn start(fs: FileSystem, net: Network) {
+pub async fn start(fs: FileSystem, net: Network, git: Git) {
     let Ok(_) = init_logging() else {
         eprintln!("Failed to initialize logging.");
         return;
@@ -51,7 +56,7 @@ pub async fn start(fs: FileSystem, net: Network) {
     info!("Config loaded");
     let addresses = config
         .forges()
-        .flat_map(|(forge_name, forge)| create_forge_repos(forge, forge_name, &net))
+        .flat_map(|(forge_name, forge)| create_forge_repos(forge, forge_name, &net, &git))
         .map(start_actor)
         .collect::<Vec<_>>();
     let _ = actix_rt::signal::ctrl_c().await;
@@ -63,6 +68,7 @@ fn create_forge_repos(
     forge: &Forge,
     forge_name: ForgeName,
     net: &Network,
+    git: &Git,
 ) -> Vec<(ForgeName, RepoName, RepoActor)> {
     let forge = forge.clone();
     let span = tracing::info_span!("Forge", %forge_name, %forge);
@@ -70,7 +76,7 @@ fn create_forge_repos(
     info!("Creating Forge");
     forge
         .repos()
-        .map(create_actor(forge_name, forge.clone(), net))
+        .map(create_actor(forge_name, forge.clone(), net, git))
         .collect::<Vec<_>>()
 }
 
@@ -78,8 +84,10 @@ fn create_actor(
     forge_name: ForgeName,
     forge: config::Forge,
     net: &Network,
+    git: &Git,
 ) -> impl Fn((RepoName, &Repo)) -> (ForgeName, RepoName, RepoActor) {
     let net = net.clone();
+    let git = git.clone();
     move |(repo_name, repo)| {
         let span = tracing::info_span!("Repo", %repo_name, %repo);
         let _guard = span.enter();
@@ -87,6 +95,7 @@ fn create_actor(
         let actor = actors::repo::RepoActor::new(
             config::RepoDetails::new(&repo_name, repo, &forge_name, &forge),
             net.clone(),
+            git.clone(),
         );
         info!("Created Repo");
         (forge_name.clone(), repo_name, actor)

src/server/types.rs

@@ -0,0 +1,32 @@
+use std::fmt::Display;
+
+use crate::server::{config::BranchName, forge};
+
+#[derive(Clone, Debug, Hash, PartialEq, Eq)]
+pub struct GitRef(pub String);
+impl From<forge::Commit> for GitRef {
+    fn from(value: forge::Commit) -> Self {
+        Self(value.sha().to_string())
+    }
+}
+impl From<BranchName> for GitRef {
+    fn from(value: BranchName) -> Self {
+        Self(value.0)
+    }
+}
+impl Display for GitRef {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.0)
+    }
+}
+
+#[derive(Debug)]
+pub enum ResetForce {
+    None,
+    Force(GitRef),
+}
+impl Display for ResetForce {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{:?}", self)
+    }
+}