feat: make Tag event filter take a regular expression

Signed-off-by: Lars Wirzenius <liw@liw.fi>

ci-broker.md

@@ -943,7 +943,7 @@ adapters:
 triggers:
   - adapter: default
     filters:
-      - !Tag "v1.0"
+      - !Tag "v\\d+(\\.\\d+)"
 ~~~
 
 ## Filter predicate `Branch`

src/filter.rs

@@ -1,10 +1,11 @@
 use std::path::{Path, PathBuf};
 
+use regex::Regex;
 use serde::{Deserialize, Serialize};
 
 use radicle::{
     cob::patch::PatchId,
-    git::{raw::ObjectType, BranchName, Oid, RefString},
+    git::{raw::ObjectType, BranchName, Oid},
     node::NodeId,
     prelude::{Profile, RepoId},
     storage::git::Repository,
@@ -55,8 +56,8 @@ pub enum EventFilter {
     /// Event is for a specific branch.
     Branch(BranchName),
 
-    /// Event is for a specific tag.
-    Tag(RefString),
+    /// Event is for a tag whose name matches a regular expression.
+    Tag(String),
 
     /// Event if for the default branch for the repository.
     DefaultBranch,
@@ -155,11 +156,24 @@ impl EventFilter {
                     format!("wanted={wanted} actual={actual:?}"),
                 )
             }
-            Self::Tag(wanted) => {
-                let actual = event.tag();
-                let allowed = Some(wanted) == actual;
-                Decision::string("Tag", allowed, format!("wanted={wanted} actual={actual:?}"))
-            }
+            Self::Tag(wanted) => match Regex::new(wanted) {
+                Ok(re) => {
+                    let actual = event.tag();
+                    let allowed = match &actual {
+                        Some(actual) => re.is_match_at(actual.as_str(), 0),
+                        _ => false,
+                    };
+                    Decision::string(
+                        "Tag",
+                        allowed,
+                        format!("wanted={wanted:?} actual={actual:?}"),
+                    )
+                }
+                Err(err) => {
+                    logger::queueproc_filter_regex_error(wanted, err);
+                    Decision::new("Tag", false, "regex syntax error")
+                }
+            },
             Self::DefaultBranch => {
                 let repo = event.repository();
                 let actual = event.branch();

src/logger.rs

@@ -444,6 +444,15 @@ pub fn queueproc_queue_length(len: usize) {
     );
 }
 
+pub fn queueproc_filter_regex_error(pattern: &str, err: regex::Error) {
+    warn!(
+        msg_id = ?Id::QueueProcFilterDecision,
+        kind = %Kind::FilterDecision,
+        ?pattern,
+        ?err,
+        "regular expression syntax error");
+}
+
 pub fn queueproc_filter_decision(event: &CiEvent, filter: &EventFilter, allowed: bool) {
     info!(
         msg_id = ?Id::QueueProcFilterDecision,