feat: support pull request opened event

src/gh/event.rs

@@ -1,5 +1,13 @@
+use octocrab::models::webhook_events::payload::PullRequestWebhookEventPayload;
 use serde::Deserialize;
 
+#[derive(Debug, Deserialize)]
+#[serde(untagged)]
+pub enum Payload {
+    CheckSuite(CheckSuiteEvent),
+    PullRequest(PullRequestEvent),
+}
+
 #[derive(Debug, Deserialize)]
 pub struct CheckSuiteEvent {
     pub action: CheckSuiteAction,
@@ -18,7 +26,6 @@ pub enum CheckSuiteAction {
 
 #[derive(Debug, Deserialize)]
 pub struct CheckSuitePayload {
-    pub id: u64,
     pub pull_requests: Vec<PullRequest>,
     pub head_sha: String,
 }
@@ -44,3 +51,11 @@ pub struct RepositoryOwner {
 pub struct Installation {
     pub id: u64,
 }
+
+#[derive(Debug, Deserialize)]
+pub struct PullRequestEvent {
+    pub installation: Installation,
+    #[serde(flatten)]
+    pub inner: PullRequestWebhookEventPayload,
+    pub repository: octocrab::models::Repository,
+}

src/gh/mod.rs

@@ -1,3 +1,4 @@
+use anyhow::anyhow;
 use cocogitto::settings::Settings as CogSettings;
 use octocrab::models::checks::CheckRun;
 use octocrab::models::issues::Comment;
@@ -12,6 +13,7 @@ use event::CheckSuiteEvent;
 use crate::cog::report::CogBotReportBuilder;
 use crate::gh::authenticate::authenticate;
 use crate::gh::commits::GetCommits;
+use crate::gh::event::PullRequestEvent;
 
 pub mod authenticate;
 pub mod check_run;
@@ -30,7 +32,7 @@ pub struct CocogittoBot {
 const COCOGITTO_BOT_LOGIN: &str = "cocogitto-bot[bot]";
 
 impl CocogittoBot {
-    pub async fn from_check_suite(event: CheckSuiteEvent, gh_key: &str) -> octocrab::Result<Self> {
+    pub async fn from_check_suite(event: CheckSuiteEvent, gh_key: &str) -> anyhow::Result<Self> {
         let check_suite = event.check_suite;
         let installation = event.installation;
         let repository = event.repository;
@@ -62,6 +64,37 @@ impl CocogittoBot {
         })
     }
 
+    pub async fn from_pull_request(event: PullRequestEvent, gh_key: &str) -> anyhow::Result<Self> {
+        let installation = event.installation;
+        let repository = event.repository;
+
+        info!("Authenticating to github api");
+        let auth = authenticate(installation.id, &repository.name, gh_key).await;
+        if let Err(auth_error) = &auth {
+            return Err(anyhow!("Failed to authenticate: {auth_error}"));
+        }
+
+        let inner = auth?;
+        let pull_request_number = Some(event.inner.pull_request.number);
+
+        let Some(default_branch) = repository.default_branch else {
+            return Err(anyhow!("default_branch missing from pull_request event"));
+        };
+
+        let Some(owner) = repository.owner.map(|owner| owner.login) else {
+            return Err(anyhow!("owner missing from pull_request event"));
+        };
+
+        Ok(Self {
+            inner,
+            owner,
+            repo: repository.name,
+            head_sha: event.inner.pull_request.head.sha,
+            pull_request_number,
+            default_branch,
+        })
+    }
+
     pub async fn run(&mut self) -> anyhow::Result<()> {
         let check_run = self.create_check_runs().await?;
 

src/main.rs

@@ -5,14 +5,15 @@ use axum::http::HeaderMap;
 use axum::routing::{get, post};
 use axum::{Json, Router};
 use axum_macros::debug_handler;
+use gh::event::CheckSuiteAction;
+use octocrab::models::webhook_events::payload::PullRequestWebhookEventAction;
 use tower_http::trace::TraceLayer;
 use tracing::{info, warn};
 use tracing_subscriber::layer::SubscriberExt;
 use tracing_subscriber::util::SubscriberInitExt;
 
-use gh::event::{CheckSuiteAction, CheckSuiteEvent};
-
 use crate::error::AppResult;
+use crate::gh::event::Payload;
 use crate::gh::CocogittoBot;
 use crate::settings::Settings;
 
@@ -64,33 +65,51 @@ async fn main() -> anyhow::Result<()> {
 async fn pull_request_handler(
     State(state): State<AppState>,
     headers: HeaderMap,
-    Json(event): Json<CheckSuiteEvent>,
+    Json(event): Json<Payload>,
 ) -> AppResult<()> {
     let Some(event_header) = headers.get("X-Github-Event") else {
         warn!("'X-Github-Event' header missing, ignoring request");
         return Ok(());
     };
 
-    let Ok("check_suite") = event_header.to_str() else {
-        info!("Ignoring non check_suite event");
-        return Ok(());
-    };
-
-    if event.action == CheckSuiteAction::Completed {
-        info!("Ignoring completed check_suite");
-        return Ok(());
+    match event_header.to_str() {
+        Ok("check_suite") | Ok("pull_request") => {}
+        _ => {
+            info!("Ignoring non check_suite event");
+            return Ok(());
+        }
     }
 
-    if event.check_suite.pull_requests.is_empty() {
-        info!("Ignoring non pull request check_suite event");
-        return Ok(());
+    match event {
+        Payload::CheckSuite(event) => {
+            if event.action == CheckSuiteAction::Completed {
+                info!("Ignoring completed check_suite");
+                return Ok(());
+            }
+
+            if event.check_suite.pull_requests.is_empty() {
+                info!("Ignoring non pull request check_suite event");
+                return Ok(());
+            }
+
+            CocogittoBot::from_check_suite(event, &state.github_key)
+                .await?
+                .run()
+                .await?;
+        }
+        Payload::PullRequest(event) => {
+            if event.inner.action != PullRequestWebhookEventAction::Opened {
+                info!("Ignoring pull_request event");
+                return Ok(());
+            }
+
+            CocogittoBot::from_pull_request(event, &state.github_key)
+                .await?
+                .run()
+                .await?;
+        }
     }
 
-    CocogittoBot::from_check_suite(event, &state.github_key)
-        .await?
-        .run()
-        .await?;
-
     Ok(())
 }