Merge pull request 'Fix missing env var error' (#5) from 1.0.1 into main

Reviewed-on: #5

.devcontainer/Dockerfile

@@ -11,6 +11,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     curl \
     git \
     build-essential \
+    libssl-dev \
     cmake \
     pkg-config \
     clang \

.devcontainer/devcontainer.json

@@ -12,18 +12,8 @@
     "containerEnv": {
         "SHELL": "/bin/bash"
     },
-    "customizations": {
-        "vscode": {
-            "extensions": ["rust-lang.rust-analyzer", "tamasfe.even-better-toml", "fill-labs.dependi"],
-            "settings": {
-                "[rust]": {
-                    "editor.defaultFormatter": "rust-lang.rust-analyzer",
-                    "editor.formatOnSave": true
-                }
-            }
-        }
-    },
     "workspaceMount": "source=${localWorkspaceFolder},target=/workspaces/herald,type=bind",
     "workspaceFolder": "/workspaces/herald",
+ 	"runArgs": ["--userns=keep-id", "--security-opt", "label=disable"],
     "appPort": [3000]
 }

.dockerignore

@@ -0,0 +1,4 @@
+target/
+.env
+.devcontainer/
+docs/

.env.example

@@ -0,0 +1,19 @@
+HTTP_PORT=3000
+BOT_NAME=Herald
+
+WEBHOOK_SIG_HEADER_SECRET=
+
+OPEN_ROUTER_API_KEY=
+OPEN_ROUTER_MODEL=deepseek/deepseek-v4-flash
+OPEN_ROUTER_TIMEOUT=120
+
+BOT_MAX_CONCURRENT=5
+
+GITEA_URL=https://gitea.example.com
+GITEA_TOKEN=
+GITEA_TIMEOUT=30
+
+# Optional
+SENTRY_DSN=
+RUST_LOG=info
+RUST_BACKTRACE=1

.woodpecker/release.yml

@@ -0,0 +1,19 @@
+when:
+    event:
+        - tag
+
+steps:
+    - name: release-docker
+      image: quay.io/buildah/stable
+      privileged: true
+      volumes:
+          - /data/woodpecker-builds:/data
+      commands:
+          - echo $DOCKER_PASSWORD | buildah login docker.io -u $DOCKER_USERNAME --password-stdin
+          - chmod +x scripts/build.sh
+          - bash scripts/build.sh
+      environment:
+          DOCKER_USERNAME:
+              from_secret: docker_username
+          DOCKER_PASSWORD:
+              from_secret: docker_password

.woodpecker/tests.yml

@@ -0,0 +1,15 @@
+when:
+    event:
+        - push
+
+steps:
+    - name: clippy
+      image: rust:1.96
+      commands:
+          - rustup component add clippy
+          - cargo clippy
+
+    - name: test
+      image: rust:1.96
+      commands:
+          - cargo test

.zed/settings.json

@@ -0,0 +1,11 @@
+{
+    "lsp": {
+        "rust-analyzer": {
+            "initialization_options": {
+                "check": {
+                    "command": "clippy"
+                }
+            }
+        }
+    }
+}

Cargo.toml

@@ -1,19 +1,32 @@
 [package]
 name = "herald"
-version = "0.1.0"
+version = "1.0.1"
 edition = "2024"
 
+[profile.release]
+debug = 1
+
 [dependencies]
-reqwest = { version = "0.13", features = ["json"] }
+reqwest = { version = "0.12", default-features = false, features = ["json", "rustls-tls"] }
 tokio = { version = "1.52", features = ["full"] }
+tokio-stream = "0.1"
+tokio-util = "0.7"
+futures-util = "0.3"
 serde_json = "1.0"
 serde = { version = "1.0", features = ["derive"] }
+sentry = { version = "0.48", features = ["tower-axum-matched-path"] }
+sentry-anyhow = { version = "0.48", features = ["backtrace"] }
+openrouter-rs = "0.10"
 dotenvy = "0.15"
+tower = "0.5"
+tower-http = {version = "0.6", features = ["trace"] }
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features=["env-filter"] }
 axum = "0.8"
-anyhow = "1.0"
+anyhow = { version = "1.0", features = ["backtrace"] }
 thiserror = "2.0"
 hmac = "0.13"
 sha2 = "0.11"
 hex = "0.4"
 subtle = "2.6"
-bytes = "1.11"
+bytes = "1.11"

Containerfile

@@ -0,0 +1,12 @@
+FROM rust:1.96 as builder
+
+WORKDIR /app
+COPY . .
+RUN cargo build --release
+
+
+FROM debian:trixie-slim
+
+WORKDIR /app
+COPY --from=builder /app/target/release/herald .
+CMD [ "./herald" ]

README.md

@@ -0,0 +1,53 @@
+# Herald
+
+Herald is a Gitea bot that performs automated AI-powered code reviews on pull requests using [OpenRouter](https://openrouter.ai/).
+
+## Features
+
+- Listens for Gitea webhook events and triggers code reviews on pull request comments
+- Streams reviews back to Gitea as PR comments
+- Concurrent review processing with configurable parallelism
+- Graceful shutdown — in-progress reviews finish before the process exits
+- Error tracking via Sentry
+- Tiny memory footprint (~4MB) thanks to Rust
+
+## Installation
+
+**Requirements:** Rust toolchain ([rustup.rs](https://rustup.rs))
+
+```sh
+cargo build --release
+./target/release/herald
+```
+
+Herald reads its configuration from environment variables (a `.env` file is supported):
+
+| Variable | Description |
+|---|---|
+| `HTTP_PORT` | Port to listen on |
+| `BOT_NAME` | The bot's Gitea username (used to detect mentions) |
+| `WEBHOOK_SIG_HEADER_SECRET` | Gitea webhook secret for signature verification |
+| `OPEN_ROUTER_API_KEY` | OpenRouter API key |
+| `OPEN_ROUTER_MODEL` | Model to use (e.g. `deepseek/deepseek-v4-flash`) |
+| `OPEN_ROUTER_TIMEOUT` | OpenRouter request timeout in seconds |
+| `BOT_MAX_CONCURRENT` | Maximum number of concurrent reviews |
+| `GITEA_URL` | Base URL of your Gitea instance |
+| `GITEA_TOKEN` | Gitea API token |
+| `GITEA_TIMEOUT` | Gitea API request timeout in seconds |
+| `SENTRY_DSN` | *(optional)* Sentry DSN for error tracking |
+| `RUST_LOG` | *(optional)* Log level, defaults to `info` |
+
+## Development
+
+The easiest way to get started is with the provided [Dev Container](https://containers.dev/) (VS Code or Zed with the dev container extension).
+
+Open the project and reopen it in the container — the Rust toolchain is pre-installed.
+
+**Without Dev Container**, you just need a Rust toolchain:
+
+```sh
+rustup toolchain install stable
+cargo run
+```
+
+Copy `.env.example` to `.env` and fill in your values before running.

scripts/build.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+IMAGE="tintounn/herald"
+
+if [ -z "${CI_COMMIT_TAG:-}" ]; then
+    echo "Error: CI_COMMIT_TAG is not set" >&2
+    exit 1
+fi
+
+TAG="${CI_COMMIT_TAG}"
+
+echo "Building ${IMAGE}:${TAG}..."
+buildah build \
+    --file Containerfile \
+    --tag "docker.io/${IMAGE}:${TAG}" \
+    .
+
+echo "Pushing ${IMAGE}:${TAG}..."
+buildah push "${IMAGE}:${TAG}"
+
+echo "Done: ${IMAGE}:${TAG}"

src/api.rs

@@ -1,38 +1,74 @@
 use axum::body::{Bytes, to_bytes};
-use axum::extract::{FromRef, FromRequest};
-use axum::response::{IntoResponse, Response};
+use axum::extract::{FromRef, FromRequest, State};
+use axum::http::Request;
+use axum::response::IntoResponse;
 use axum::routing::{get, post};
 use axum::{Json, Router};
 use hmac::{Hmac, KeyInit, Mac};
+use reqwest::StatusCode;
+use sentry::integrations::tower::{NewSentryLayer, SentryHttpLayer};
 use serde_json::Value;
 use sha2::Sha256;
 use subtle::ConstantTimeEq;
+use tower::ServiceBuilder;
+use tower_http::trace::TraceLayer;
+use tracing::{info, instrument};
+
+use tokio_util::sync::CancellationToken;
 
 use crate::consts::{GITEA_EVENT_TYPE_HEADER_NAME, GITEA_SIG_HEADER_NAME, MAX_WEBHOOK_BODY_SIZE};
 use crate::errors::AppError;
 use crate::gitea::WebhookType;
 use crate::state::AppState;
 
-pub async fn start(app_state: AppState) -> anyhow::Result<()> {
+pub async fn start(app_state: AppState, shutdown: CancellationToken) -> anyhow::Result<()> {
     let http_port = app_state.config.http_port;
 
     let app = Router::new()
         .route("/", get(root))
         .route("/webhook", post(webhook))
+        .layer(
+            ServiceBuilder::new()
+                .layer(NewSentryLayer::<Request<_>>::new_from_top())
+                .layer(SentryHttpLayer::new())
+                .layer(TraceLayer::new_for_http()),
+        )
         .with_state(app_state);
 
     let listener = tokio::net::TcpListener::bind(format!("0.0.0.0:{}", http_port)).await?;
+    info!("Listening API on port {}", http_port);
+
     axum::serve(listener, app)
+        .with_graceful_shutdown(async move { shutdown.cancelled().await })
         .await
         .map_err(anyhow::Error::from)
+        .inspect(|_| info!("API shutting down complete"))?;
+
+    Ok(())
 }
 
 async fn root() -> &'static str {
     "Hi, i'm Herald :)"
 }
 
-async fn webhook(WebhookExtract(wb): WebhookExtract) -> Result<Response, AppError> {
-    Ok("lol".into_response())
+#[instrument(skip(app_state), fields(webhook_type), err)]
+async fn webhook(
+    State(app_state): State<AppState>,
+    WebhookExtract(wb): WebhookExtract,
+) -> Result<impl IntoResponse, AppError> {
+    tracing::Span::current().record("webhook_type", tracing::field::debug(&wb));
+
+    let event_id = wb.event_id();
+    if app_state.bot.check_and_mark(event_id).await {
+        return Err(AppError::AlreadyProcessedErr);
+    }
+
+    if app_state.bot_tx.try_send(wb).is_err() {
+        app_state.bot.unmark(event_id).await;
+        return Err(AppError::ChannelFullErr);
+    }
+
+    Ok((StatusCode::CREATED, "Task started"))
 }
 
 pub struct WebhookExtract(pub WebhookType);
@@ -44,6 +80,7 @@ where
 {
     type Rejection = AppError;
 
+    #[instrument(skip(req, state), err)]
     async fn from_request(req: axum::extract::Request, state: &S) -> Result<Self, Self::Rejection> {
         let app_state = AppState::from_ref(state);
         let headers = req.headers();
@@ -58,6 +95,16 @@ where
             &body_bytes,
         )?;
 
+        let body_str = String::from_utf8_lossy(&body_bytes).into_owned();
+        sentry::configure_scope(|scope| {
+            scope.add_event_processor(move |mut event| {
+                let mut request = event.request.take().unwrap_or_default();
+                request.data = Some(body_str.clone());
+                event.request = Some(request);
+                Some(event)
+            });
+        });
+
         let webhook = parse_webhook(&type_header, &app_state.config.bot_name, &body_bytes)?;
         Ok(WebhookExtract(webhook))
     }

src/bot.rs

@@ -1,13 +1,211 @@
-use crate::{env::EnvConfig, gitea::WebhookType};
+use crate::{
+    env::EnvConfig,
+    gitea::{GiteaAPI, WebhookType},
+    open_router::OpenRouterClient,
+};
+use serde::Deserialize;
+use std::{collections::HashSet, sync::Arc, time::Duration};
+use tokio::sync::Mutex;
+use tokio_util::sync::CancellationToken;
+use tracing::{error, info, instrument};
 
+#[derive(Deserialize, Debug)]
+pub struct ReviewResult {
+    pub reviews: Vec<ReviewItem>,
+    pub comment: String,
+    pub cost: Option<f64>,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct ReviewItem {
+    pub filename: String,
+    pub line: Option<u64>,
+    pub code: String,
+    pub message: String,
+}
+
+#[derive(Clone)]
 pub struct Bot {
     config: EnvConfig,
+    gitea_api: GiteaAPI,
+    open_router_client: OpenRouterClient,
+    http_client: reqwest::Client,
+    max_concurrent: usize,
+    actions_handled: Arc<Mutex<HashSet<u64>>>,
 }
 
 impl Bot {
-    pub fn new(config: EnvConfig) -> Self {
-        Self { config }
+    pub fn new(config: EnvConfig) -> anyhow::Result<Self> {
+        let gitea_timeout = config.gitea_timeout;
+        let open_router_timeout = config.open_router_timeout;
+
+        Ok(Self {
+            gitea_api: GiteaAPI::new(&config.gitea_url, &config.gitea_token, gitea_timeout)?,
+            open_router_client: OpenRouterClient::new(
+                &config.open_router_api_key,
+                &config.open_router_model,
+                open_router_timeout,
+            )?,
+            max_concurrent: config.bot_max_concurrent,
+            config,
+            actions_handled: Arc::new(Mutex::new(HashSet::new())),
+            http_client: reqwest::Client::builder()
+                .timeout(Duration::from_secs(gitea_timeout))
+                .build()?,
+        })
     }
 
-    pub async fn exec(&self, webhook: WebhookType) {}
+    pub async fn start(
+        &self,
+        mut rx: tokio::sync::mpsc::Receiver<WebhookType>,
+        shutdown: CancellationToken,
+    ) -> anyhow::Result<()> {
+        info!("Bot started");
+
+        let sem = Arc::new(tokio::sync::Semaphore::new(self.max_concurrent));
+        let mut tasks = tokio::task::JoinSet::new();
+
+        loop {
+            let wb = tokio::select! {
+                biased;
+                _ = shutdown.cancelled() => break,
+                msg = rx.recv() => match msg {
+                    Some(wb) => wb,
+                    None => break,
+                },
+            };
+
+            while let Some(res) = tasks.try_join_next() {
+                if let Err(e) = res {
+                    error!("Task panicked: {e}");
+                }
+            }
+
+            info!(queued = rx.len(), active = tasks.len(), "Webhook received");
+            let permit = sem.clone().acquire_owned().await?;
+            let self_clone = self.clone();
+
+            tasks.spawn(async move {
+                self_clone.exec(wb).await;
+                drop(permit);
+            });
+        }
+
+        tasks.join_all().await;
+
+        info!("Bot shutting down complete");
+        Ok(())
+    }
+
+    #[instrument(skip(self, webhook), fields(repo, pr))]
+    pub async fn exec(&self, webhook: WebhookType) {
+        match &webhook {
+            WebhookType::Review(p) => {
+                tracing::Span::current().record("repo", &p.repository.full_name);
+                tracing::Span::current().record("pr", p.pull_request.number);
+            }
+        };
+
+        let exec_result = match webhook {
+            WebhookType::Review(review_payload) => crate::bot_actions::review::exec_review(
+                &self.gitea_api,
+                &self.open_router_client,
+                &self.http_client,
+                &self.config.open_router_model,
+                review_payload,
+            ),
+        }
+        .await;
+
+        match exec_result {
+            Ok(_) => info!("Task completed"),
+            Err(err) => {
+                error!(%err, "Task error");
+                sentry_anyhow::capture_anyhow(&err);
+            }
+        }
+    }
+
+    pub async fn check_and_mark(&self, event_id: u64) -> bool {
+        let mut action_handled_lock = self.actions_handled.lock().await;
+
+        !action_handled_lock.insert(event_id)
+    }
+
+    pub async fn unmark(&self, event_id: u64) {
+        let mut action_handled_lock = self.actions_handled.lock().await;
+
+        action_handled_lock.remove(&event_id);
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn make_actions_handled() -> Arc<Mutex<HashSet<u64>>> {
+        Arc::new(Mutex::new(HashSet::new()))
+    }
+
+    async fn check_and_mark(actions_handled: &Arc<Mutex<HashSet<u64>>>, event_id: u64) -> bool {
+        let mut lock = actions_handled.lock().await;
+        !lock.insert(event_id)
+    }
+
+    async fn unmark(actions_handled: &Arc<Mutex<HashSet<u64>>>, event_id: u64) {
+        let mut lock = actions_handled.lock().await;
+        lock.remove(&event_id);
+    }
+
+    #[tokio::test]
+    async fn test_check_and_mark_first_call_returns_false() {
+        let actions_handled = make_actions_handled();
+        assert!(!check_and_mark(&actions_handled, 1).await);
+    }
+
+    #[tokio::test]
+    async fn test_check_and_mark_second_call_returns_true() {
+        let actions_handled = make_actions_handled();
+        check_and_mark(&actions_handled, 1).await;
+        assert!(check_and_mark(&actions_handled, 1).await);
+    }
+
+    #[tokio::test]
+    async fn test_check_and_mark_different_ids_are_independent() {
+        let actions_handled = make_actions_handled();
+        check_and_mark(&actions_handled, 1).await;
+        assert!(!check_and_mark(&actions_handled, 2).await);
+    }
+
+    #[tokio::test]
+    async fn test_unmark_allows_reprocessing() {
+        let actions_handled = make_actions_handled();
+        check_and_mark(&actions_handled, 1).await;
+        unmark(&actions_handled, 1).await;
+        assert!(!check_and_mark(&actions_handled, 1).await);
+    }
+
+    #[tokio::test]
+    async fn test_unmark_nonexistent_id_is_noop() {
+        let actions_handled = make_actions_handled();
+        unmark(&actions_handled, 99).await;
+        assert!(!check_and_mark(&actions_handled, 99).await);
+    }
+
+    #[tokio::test]
+    async fn test_check_and_mark_concurrent_same_id() {
+        let actions_handled = make_actions_handled();
+        let actions_handled2 = Arc::clone(&actions_handled);
+
+        let t1 = tokio::spawn(async move { check_and_mark(&actions_handled, 42).await });
+        let t2 = tokio::spawn(async move { check_and_mark(&actions_handled2, 42).await });
+
+        let (r1, r2) = tokio::join!(t1, t2);
+        let results = [r1.unwrap(), r2.unwrap()];
+
+        // exactement un seul des deux doit retourner false (non traité)
+        assert_eq!(results.iter().filter(|&&r| !r).count(), 1);
+        // l'autre doit retourner true (déjà traité)
+        assert_eq!(results.iter().filter(|&&r| r).count(), 1);
+    }
 }

src/bot_actions/mod.rs

@@ -0,0 +1 @@
+pub mod review;

src/bot_actions/review.rs

@@ -0,0 +1,214 @@
+use futures_util::stream::TryStreamExt;
+use tokio::io::AsyncReadExt;
+use tokio_util::io::StreamReader;
+use tracing::instrument;
+
+use crate::{
+    bot::ReviewResult,
+    consts::{BOT_PROCESS_MSG, MAX_DIFF_SIZE, REVIEW_PROMPT},
+    gitea::{GiteaAPI, ReviewPayload},
+    open_router::OpenRouterClient,
+};
+
+#[instrument(skip(gitea_api, open_router_client, http_client, review_payload))]
+pub async fn exec_review(
+    gitea_api: &GiteaAPI,
+    open_router_client: &OpenRouterClient,
+    http_client: &reqwest::Client,
+    model: &str,
+    review_payload: ReviewPayload,
+) -> anyhow::Result<()> {
+    tracing::info!(
+        repo = %review_payload.repository.full_name,
+        pr = review_payload.pull_request.number,
+        action = %review_payload.action,
+        "Starting review"
+    );
+
+    let new_comment = gitea_api
+        .comment(
+            &BOT_PROCESS_MSG.replace("{model}", model),
+            &review_payload.repository.full_name,
+            review_payload.pull_request.number,
+        )
+        .await?;
+
+    let bot_result: Result<ReviewResult, anyhow::Error> = async {
+        let git_diff =
+            download_git_diff(http_client, &review_payload.pull_request.diff_url).await?;
+
+        let diff_for_llm = format_diff_for_review(&git_diff);
+
+        let bot_request = REVIEW_PROMPT
+            .replace("{subject}", &review_payload.pull_request.title)
+            .replace("{comment}", &review_payload.comment.body)
+            .replace("{diff}", &diff_for_llm);
+
+        let chat_result = open_router_client.chat(&bot_request).await?;
+        let mut review_result = serde_json::from_str::<ReviewResult>(&chat_result.message)?;
+
+        review_result.cost = chat_result.cost;
+
+        let final_review_markdown = review_result_to_markdown(&review_result);
+
+        gitea_api
+            .post_pull_request_review(
+                &review_result,
+                &final_review_markdown,
+                &review_payload.repository.full_name,
+                review_payload.pull_request.number,
+            )
+            .await?;
+
+        Ok(review_result)
+    }
+    .await;
+
+    match bot_result {
+        Ok(_) => {
+            gitea_api
+                .delete_comment(&review_payload.repository.full_name, new_comment.id)
+                .await
+        }
+        Err(e) => {
+            gitea_api
+                .edit_comment(
+                    &format!("Error while reviewing: {}", e),
+                    &review_payload.repository.full_name,
+                    new_comment.id,
+                )
+                .await
+        }
+    }
+}
+
+fn review_result_to_markdown(review_result: &ReviewResult) -> String {
+    if review_result.reviews.is_empty() {
+        return String::from("No issues found. ✅");
+    }
+
+    let mut md = String::from("## Review Feedback\n\n");
+
+    md.push_str(&format!(
+        "### {} issues found.\n\n",
+        review_result.reviews.len()
+    ));
+
+    if !review_result.comment.is_empty() {
+        md.push_str("\n---\n\n");
+        md.push_str("### Summary\n\n");
+        md.push_str(&review_result.comment);
+        md.push('\n');
+    }
+
+    if let Some(cost) = review_result.cost {
+        md.push_str("\n---\n\n");
+        md.push_str(&format!("### Cost: ${}", cost));
+        md.push('\n');
+    }
+
+    md
+}
+
+async fn download_git_diff(http_client: &reqwest::Client, url: &str) -> anyhow::Result<String> {
+    let response = http_client.get(url).send().await?;
+    let stream = response.bytes_stream().map_err(std::io::Error::other);
+
+    let mut buf = Vec::with_capacity(MAX_DIFF_SIZE);
+    StreamReader::new(stream)
+        .take((MAX_DIFF_SIZE + 1) as u64)
+        .read_to_end(&mut buf)
+        .await?;
+
+    if buf.len() > MAX_DIFF_SIZE {
+        anyhow::bail!("Git diff exceeds the maximum allowed size of 1 Mo");
+    }
+
+    Ok(String::from_utf8_lossy(&buf).into_owned())
+}
+
+fn format_diff_for_review(git_diff: &str) -> String {
+    let mut output = String::new();
+    let mut current_file: Option<&str> = None;
+    let mut new_line: u64 = 0;
+
+    for line in git_diff.lines() {
+        if let Some(rest) = line.strip_prefix("diff --git a/") {
+            if let Some(end) = rest.find(' ') {
+                current_file = Some(&rest[..end]);
+            }
+            new_line = 0;
+            continue;
+        }
+
+        if line.starts_with("---") || line.starts_with("+++") {
+            continue;
+        }
+
+        if line.starts_with("@@") && line.contains('+') {
+            if let Some(start) = parse_hunk_new_start(line) {
+                new_line = start;
+            }
+            continue;
+        }
+
+        let Some(filename) = current_file else {
+            continue;
+        };
+
+        if line.starts_with(' ') {
+            new_line += 1;
+            continue;
+        }
+
+        if let Some(code) = line.strip_prefix('+') {
+            use std::fmt::Write;
+            let _ = writeln!(output, "{filename}:{new_line}:{code}");
+            new_line += 1;
+        }
+    }
+
+    output
+}
+
+fn parse_hunk_new_start(hunk_header: &str) -> Option<u64> {
+    let plus_part = hunk_header.split('+').nth(1)?;
+    let num_str = plus_part.split(|c: char| !c.is_ascii_digit()).next()?;
+    num_str.parse::<u64>().ok()
+}
+
+#[cfg(test)]
+#[test]
+fn test_format_diff_for_review() {
+    let diff = concat!(
+        "diff --git a/src/foo.rs b/src/foo.rs\n",
+        "--- a/src/foo.rs\n",
+        "+++ b/src/foo.rs\n",
+        "@@ -1,3 +1,6 @@\n",
+        " fn main() {\n",
+        "+    let x = 1;\n",
+        "     println!(\"hello\");\n",
+        "+    let y = 2;\n",
+        "+    let z = 3;\n",
+        " }\n",
+        "diff --git a/src/bar.rs b/src/bar.rs\n",
+        "--- a/src/bar.rs\n",
+        "+++ b/src/bar.rs\n",
+        "@@ -10,4 +10,6 @@\n",
+        " old context\n",
+        "+    let a = 10;\n",
+        " more context\n",
+        "+    let b = 20;\n",
+    );
+
+    let result = format_diff_for_review(diff);
+    let expected = concat!(
+        "src/foo.rs:2:    let x = 1;\n",
+        "src/foo.rs:4:    let y = 2;\n",
+        "src/foo.rs:5:    let z = 3;\n",
+        "src/bar.rs:11:    let a = 10;\n",
+        "src/bar.rs:13:    let b = 20;\n",
+    );
+
+    assert_eq!(result, expected);
+}

src/consts.rs

@@ -1,3 +1,44 @@
 pub const GITEA_SIG_HEADER_NAME: &str = "x-gitea-signature";
 pub const GITEA_EVENT_TYPE_HEADER_NAME: &str = "x-gitea-event-type";
+
 pub const MAX_WEBHOOK_BODY_SIZE: usize = 1024 * 1024; // 1 MiB
+pub const MAX_DIFF_SIZE: usize = 1024 * 1024; // 1 MiB
+
+pub const BOT_PROCESS_MSG: &str = "
+    Review in progress with the model \"{model}\"...
+";
+
+pub const REVIEW_PROMPT: &str = "
+    You are a senior software engineer reviewing code changes.
+
+    Check good practices and code quality.
+
+    This is the pull request subject: \"{subject}\"
+
+    This is the user comment: \"{comment}\"
+
+    The code changes (only added lines, with line numbers):
+
+    {diff}
+
+    Please review the code changes and provide feedback.
+
+    IMPORTANT: the `line` field must be the line number shown before each line.
+    The provided code has the format: `filename:line:code`
+
+    Return your feedback, in french, with only this json format, reviews must contain each review
+    All fields are mandatory.
+    (filename field must contain the full path with extension) and comment must contain a final summary:
+
+    {
+        \"reviews\": [
+            {
+                \"filename\": \"\",
+                \"line\": ,
+                \"code\": \"\",
+                \"message\": \"\"
+            }
+        ],
+        \"comment\": \"\"
+    }
+";

src/env.rs

@@ -1,36 +1,82 @@
 use anyhow::anyhow;
-use dotenvy::dotenv;
 
 #[derive(Clone)]
 pub struct EnvConfig {
     pub http_port: u16,
     pub webhook_secret: String,
     pub open_router_api_key: String,
+    pub open_router_model: String,
+    pub open_router_timeout: u64,
     pub bot_name: String,
+    pub bot_max_concurrent: usize,
+    pub gitea_url: String,
+    pub gitea_token: String,
+    pub gitea_timeout: u64,
 }
 
 pub fn load_config() -> anyhow::Result<EnvConfig> {
-    dotenv().ok();
-
     let http_port = try_get_env("HTTP_PORT")?.parse()?;
     let bot_name = try_get_env("BOT_NAME")?;
     let webhook_secret = try_get_env("WEBHOOK_SIG_HEADER_SECRET")?;
     let open_router_api_key = try_get_env("OPEN_ROUTER_API_KEY")?;
+    let open_router_model = try_get_env("OPEN_ROUTER_MODEL")?;
+    let open_router_timeout = try_get_env("OPEN_ROUTER_TIMEOUT")?.parse()?;
+    let bot_max_concurrent = try_get_env("BOT_MAX_CONCURRENT")?.parse()?;
+    let gitea_url = try_get_env("GITEA_URL")?;
+    let gitea_token = try_get_env("GITEA_TOKEN")?;
+    let gitea_timeout = try_get_env("GITEA_TIMEOUT")?.parse()?;
 
     Ok(EnvConfig {
         http_port,
         webhook_secret,
         bot_name,
         open_router_api_key,
+        open_router_model,
+        open_router_timeout,
+        bot_max_concurrent,
+        gitea_url,
+        gitea_token,
+        gitea_timeout,
     })
 }
 
-fn try_get_env(key: &str) -> anyhow::Result<String> {
-    let env = std::env::var(key)?;
+pub fn try_get_env(key: &str) -> anyhow::Result<String> {
+    let env_value = std::env::var(key).map_err(|e| anyhow::anyhow!("{}: {}", key, e))?;
 
-    if env.trim().is_empty() {
+    if env_value.trim().is_empty() {
         return Err(anyhow!(format!("env var {} is empty", key)));
     }
 
-    Ok(env)
+    Ok(env_value)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_try_get_env_returns_value() {
+        unsafe { std::env::set_var("TEST_ENV_PRESENT", "hello") };
+        assert_eq!(try_get_env("TEST_ENV_PRESENT").unwrap(), "hello");
+    }
+
+    #[test]
+    fn test_try_get_env_missing_var_returns_error() {
+        unsafe { std::env::remove_var("TEST_ENV_MISSING") };
+        assert!(try_get_env("TEST_ENV_MISSING").is_err());
+    }
+
+    #[test]
+    fn test_try_get_env_empty_value_returns_error() {
+        unsafe { std::env::set_var("TEST_ENV_EMPTY", "") };
+        let err = try_get_env("TEST_ENV_EMPTY").unwrap_err();
+        assert!(err.to_string().contains("TEST_ENV_EMPTY"));
+    }
+
+    #[test]
+    fn test_try_get_env_whitespace_only_returns_error() {
+        unsafe { std::env::set_var("TEST_ENV_WHITESPACE", "   ") };
+        let err = try_get_env("TEST_ENV_WHITESPACE").unwrap_err();
+        assert!(err.to_string().contains("TEST_ENV_WHITESPACE"));
+    }
 }

src/errors.rs

@@ -1,3 +1,4 @@
+use anyhow::anyhow;
 use axum::response::IntoResponse;
 use reqwest::StatusCode;
 
@@ -21,6 +22,12 @@ pub enum AppError {
     #[error("WebHook have bad action")]
     InvalidActionErr,
 
+    #[error("Channel full")]
+    ChannelFullErr,
+
+    #[error("Already processed")]
+    AlreadyProcessedErr,
+
     #[error(transparent)]
     BadJsonStructErr(#[from] serde_json::Error),
 
@@ -54,10 +61,21 @@ impl IntoResponse for AppError {
                 StatusCode::UNAUTHORIZED,
                 "WebHook sig header is invalid".to_string(),
             ),
-            AppError::Other(_) => (
-                StatusCode::INTERNAL_SERVER_ERROR,
-                "Internal server error".to_string(),
-            ),
+            AppError::AlreadyProcessedErr => (StatusCode::OK, "Already processed".to_string()),
+            AppError::ChannelFullErr => {
+                sentry_anyhow::capture_anyhow(&anyhow!("Max concurrent tasks reached"));
+                (
+                    StatusCode::SERVICE_UNAVAILABLE,
+                    "Max concurrent tasks reached".to_string(),
+                )
+            }
+            AppError::Other(err) => {
+                sentry_anyhow::capture_anyhow(&err);
+                (
+                    StatusCode::INTERNAL_SERVER_ERROR,
+                    "Internal server error".to_string(),
+                )
+            }
         }
         .into_response()
     }

src/gitea.rs

@@ -1,17 +1,176 @@
-use serde::Deserialize;
-use serde_json::Value;
+use std::time::Duration;
 
-use crate::errors::AppError;
+use serde::Deserialize;
+use serde_json::{Value, json};
+use tracing::instrument;
+
+use crate::{bot::ReviewResult, errors::AppError};
+
+#[derive(Clone)]
+pub struct GiteaAPI {
+    base_url: String,
+    client: reqwest::Client,
+}
+
+impl GiteaAPI {
+    pub fn new(base_url: &str, token: &str, timeout: u64) -> anyhow::Result<Self> {
+        let mut default_headers = reqwest::header::HeaderMap::new();
+        default_headers.insert(
+            reqwest::header::HeaderName::from_static("authorization"),
+            reqwest::header::HeaderValue::from_str(&format!("Bearer {}", token))?,
+        );
+
+        Ok(Self {
+            base_url: String::from(base_url),
+            client: reqwest::Client::builder()
+                .timeout(Duration::from_secs(timeout))
+                .default_headers(default_headers)
+                .build()?,
+        })
+    }
+
+    #[instrument(skip(self))]
+    pub async fn comment(
+        &self,
+        body: &str,
+        full_name: &str,
+        index: u64,
+    ) -> anyhow::Result<Comment> {
+        let url = format!(
+            "{}/api/v1/repos/{}/issues/{}/comments",
+            self.base_url, full_name, index
+        );
+
+        let res = self
+            .client
+            .post(url)
+            .json(&json!({
+                "body": body
+            }))
+            .send()
+            .await?;
+
+        if !res.status().is_success() {
+            return Err(anyhow::anyhow!("Failed to comment: {}", res.status()));
+        }
+
+        res.json::<Comment>().await.map_err(anyhow::Error::from)
+    }
+
+    #[instrument(skip(self))]
+    pub async fn edit_comment(
+        &self,
+        body: &str,
+        full_name: &str,
+        comment_id: u64,
+    ) -> anyhow::Result<()> {
+        let url = format!(
+            "{}/api/v1/repos/{}/issues/comments/{}",
+            self.base_url, full_name, comment_id
+        );
+
+        let res = self
+            .client
+            .patch(url)
+            .json(&json!({
+                "body": body
+            }))
+            .send()
+            .await?;
+
+        if !res.status().is_success() {
+            return Err(anyhow::anyhow!("Failed to comment: {}", res.status()));
+        }
+
+        Ok(())
+    }
+
+    #[instrument(skip(self))]
+    pub async fn delete_comment(&self, full_name: &str, comment_id: u64) -> anyhow::Result<()> {
+        let url = format!(
+            "{}/api/v1/repos/{}/issues/comments/{}",
+            self.base_url, full_name, comment_id
+        );
+
+        let res = self.client.delete(url).send().await?;
+
+        if !res.status().is_success() {
+            return Err(anyhow::anyhow!(
+                "Failed to delete comment: {}",
+                res.status()
+            ));
+        }
+
+        Ok(())
+    }
+
+    #[instrument(skip(self, review_result))]
+    pub async fn post_pull_request_review(
+        &self,
+        review_result: &ReviewResult,
+        final_comment: &str,
+        full_name: &str,
+        index: u64,
+    ) -> anyhow::Result<()> {
+        let url = format!(
+            "{}/api/v1/repos/{}/pulls/{}/reviews",
+            self.base_url, full_name, index
+        );
+
+        let comments = &review_result
+            .reviews
+            .iter()
+            .filter(|r| r.line.is_some())
+            .map(|r| {
+                let path = r.filename.clone();
+                let line = r.line.unwrap_or(0);
+                let body = r.message.clone();
+
+                json!({
+                    "path": path,
+                    "new_position": line,
+                    "body": body
+                })
+            })
+            .collect::<Vec<_>>();
+
+        let res = self
+            .client
+            .post(url)
+            .json(&json!({
+                "event": "COMMENT",
+                "body": final_comment,
+                "comments": comments
+            }))
+            .send()
+            .await?;
+
+        if !res.status().is_success() {
+            return Err(anyhow::anyhow!("Failed to post review: {}", res.status()));
+        }
+
+        Ok(())
+    }
+}
 
 #[derive(Debug)]
 pub enum WebhookType {
     Review(ReviewPayload),
 }
 
+impl WebhookType {
+    pub fn event_id(&self) -> u64 {
+        match self {
+            WebhookType::Review(payload) => payload.comment.id,
+        }
+    }
+}
+
 #[derive(Deserialize, Debug)]
 pub struct ReviewPayload {
     pub action: String,
     pub pull_request: PullRequest,
+    pub repository: Repository,
     pub comment: Comment,
 }
 
@@ -19,6 +178,8 @@ pub struct ReviewPayload {
 pub struct PullRequest {
     pub id: u64,
     pub diff_url: String,
+    pub number: u64,
+    pub title: String,
 }
 
 #[derive(Deserialize, Debug)]
@@ -33,6 +194,11 @@ pub struct User {
     pub id: u64,
 }
 
+#[derive(Deserialize, Debug)]
+pub struct Repository {
+    pub full_name: String,
+}
+
 impl WebhookType {
     pub fn from_event(event: &str, bot_name: &str, json: Value) -> Result<Self, AppError> {
         let wb = match event {
@@ -40,14 +206,6 @@ impl WebhookType {
             _ => Err(AppError::UnknownEventErr),
         }?;
 
-        let pr_body = match &wb {
-            WebhookType::Review(review_payload) => &review_payload.comment.body,
-        };
-
-        if !pr_body.starts_with(&format!("@{}", bot_name)) {
-            return Err(AppError::UnauthorizedUserErr);
-        }
-
         let action = match &wb {
             WebhookType::Review(review_payload) => &review_payload.action,
         };
@@ -56,6 +214,14 @@ impl WebhookType {
             return Err(AppError::InvalidActionErr);
         }
 
+        let pr_body = match &wb {
+            WebhookType::Review(review_payload) => &review_payload.comment.body,
+        };
+
+        if !pr_body.starts_with(&format!("@{}", bot_name)) {
+            return Err(AppError::UnauthorizedUserErr);
+        }
+
         Ok(wb)
     }
 }
@@ -71,7 +237,12 @@ mod tests {
             "action": "created",
             "pull_request": {
                 "id": 42,
-                "diff_url": "https://mydiff.fr"
+                "diff_url": "https://mydiff.fr",
+                "number": 1,
+                "title": "My PR"
+            },
+            "repository": {
+                "full_name": "owner/repo"
             },
             "comment": {
                 "id": 7,
@@ -130,7 +301,12 @@ mod tests {
             "action": "edited",
             "pull_request": {
                 "id": 1,
-                "diff_url": "https://mydiff.fr"
+                "diff_url": "https://mydiff.fr",
+                "number": 1,
+                "title": "My PR"
+            },
+            "repository": {
+                "full_name": "owner/repo"
             },
             "comment": {
                 "id": 1,
@@ -156,7 +332,12 @@ mod tests {
             "action": "created",
             "pull_request": {
                 "id": 99,
-                "diff_url": "https://mydiff.fr"
+                "diff_url": "https://mydiff.fr",
+                "number": 5,
+                "title": "My PR"
+            },
+            "repository": {
+                "full_name": "owner/repo"
             },
             "comment": {
                 "id": 12,
@@ -188,7 +369,12 @@ mod tests {
             "action": "created",
             "pull_request": {
                 "id": 1,
-                "diff_url": "https://mydiff.fr"
+                "diff_url": "https://mydiff.fr",
+                "number": 1,
+                "title": "My PR"
+            },
+            "repository": {
+                "full_name": "owner/repo"
             },
             "comment": {
                 "id": 1,
@@ -209,7 +395,12 @@ mod tests {
             "action": "created",
             "pull_request": {
                 "id": 1,
-                "diff_url": "https://mydiff.fr"
+                "diff_url": "https://mydiff.fr",
+                "number": 1,
+                "title": "My PR"
+            },
+            "repository": {
+                "full_name": "owner/repo"
             },
             "comment": {
                 "id": 1,

src/main.rs

@@ -1,25 +1,94 @@
 use std::sync::Arc;
 
-use tokio::sync::Mutex;
+use crate::{bot::Bot, gitea::WebhookType, state::AppState};
 
-use crate::{bot::Bot, state::AppState};
+use dotenvy::dotenv;
+use tokio::signal::unix::{SignalKind, signal};
+use tokio_util::sync::CancellationToken;
+use tracing::{info, warn};
+use tracing_subscriber::{EnvFilter, fmt, layer::SubscriberExt, util::SubscriberInitExt};
 
 mod api;
 mod bot;
+mod bot_actions;
 mod consts;
 mod env;
 mod errors;
 mod gitea;
+mod open_router;
 mod state;
 
-#[tokio::main]
-async fn main() -> anyhow::Result<()> {
-    let config = env::load_config()?;
+fn main() -> anyhow::Result<()> {
+    dotenv().ok();
 
-    let app_state = AppState {
-        bot: Arc::new(Mutex::new(Bot::new(config.clone()))),
-        config: config,
+    tracing_subscriber::registry()
+        .with(fmt::layer())
+        .with(
+            EnvFilter::try_from_default_env() // lit RUST_LOG depuis l'env
+                .unwrap_or_else(|_| EnvFilter::new("info")),
+        )
+        .init();
+
+    let _sentry_guard = if let Ok(sentry_dsn) = env::try_get_env("SENTRY_DSN") {
+        info!("Initialize sentry");
+
+        Some(sentry::init((
+            sentry_dsn,
+            sentry::ClientOptions {
+                release: sentry::release_name!(),
+                send_default_pii: true,
+                ..Default::default()
+            },
+        )))
+    } else {
+        warn!("SENTRY_DSN not set, sentry will not be initialized");
+        None
     };
 
-    api::start(app_state).await
+    tokio::runtime::Runtime::new()?.block_on(run())
+}
+
+async fn run() -> anyhow::Result<()> {
+    let config = env::load_config()?;
+
+    info!(
+        port = config.http_port,
+        model = %config.open_router_model,
+        gitea_url = %config.gitea_url,
+        bot_name = %config.bot_name,
+        "Starting Herald"
+    );
+
+    let shutdown = CancellationToken::new();
+
+    let bot = Bot::new(config.clone())?;
+    let (tx, rx) = tokio::sync::mpsc::channel::<WebhookType>(config.bot_max_concurrent * 2);
+    let app_state = AppState {
+        bot_tx: tx,
+        bot: bot.clone(),
+        config,
+    };
+
+    let signal = async {
+        let mut sigterm = signal(SignalKind::terminate())?;
+        let mut sigint = signal(SignalKind::interrupt())?;
+        tokio::select! {
+            _ = sigterm.recv() => info!("Received SIGTERM"),
+            _ = sigint.recv() => info!("Received SIGINT"),
+        }
+
+        info!("Shutting down...");
+        shutdown.cancel();
+        anyhow::Ok(())
+    };
+
+    tokio::try_join!(
+        bot.start(rx, shutdown.clone()),
+        api::start(app_state, shutdown.clone()),
+        signal
+    )?;
+
+    info!("Shutdown complete");
+
+    Ok(())
 }

src/open_router.rs

@@ -0,0 +1,50 @@
+use std::time::Duration;
+
+use openrouter_rs::{Message, api::chat::ChatCompletionRequest};
+use tracing::instrument;
+
+pub struct ChatResult {
+    pub message: String,
+    pub cost: Option<f64>,
+}
+
+#[derive(Clone)]
+pub struct OpenRouterClient {
+    client: openrouter_rs::OpenRouterClient,
+    model: String,
+}
+
+impl OpenRouterClient {
+    pub fn new(token: &str, model: &str, timeout: u64) -> anyhow::Result<Self> {
+        Ok(Self {
+            client: openrouter_rs::OpenRouterClient::builder()
+                .api_key(token)
+                .http_client(
+                    reqwest::Client::builder()
+                        .timeout(Duration::from_secs(timeout))
+                        .build()?,
+                )
+                .build()?,
+            model: String::from(model),
+        })
+    }
+
+    #[instrument(skip(self), err)]
+    pub async fn chat(&self, msg: &str) -> anyhow::Result<ChatResult> {
+        let request = ChatCompletionRequest::builder()
+            .model(&self.model)
+            .enable_reasoning()
+            .messages(vec![Message::new(openrouter_rs::types::Role::User, msg)])
+            .build()?;
+
+        let response = self.client.chat().create(&request).await?;
+
+        Ok(ChatResult {
+            message: response.choices[0]
+                .content()
+                .map(String::from)
+                .ok_or(anyhow::anyhow!("No content"))?,
+            cost: response.usage.and_then(|u| u.cost),
+        })
+    }
+}

src/state.rs

@@ -1,10 +1,8 @@
-use std::sync::Arc;
-use tokio::sync::Mutex;
-
-use crate::{bot::Bot, env::EnvConfig};
+use crate::{bot::Bot, env::EnvConfig, gitea::WebhookType};
 
 #[derive(Clone)]
 pub struct AppState {
-    pub bot: Arc<Mutex<Bot>>,
+    pub bot_tx: tokio::sync::mpsc::Sender<WebhookType>,
+    pub bot: Bot,
     pub config: EnvConfig,
 }