feat(stovepipe): add commit ingestion hooks and push filtering

Introduce CommitEvent, CommitIngester/CommitEventHandler, a no-op logging
handler stub, and repo/branch watch filtering for downstream ingestion.

Author: gsturges

stovepipe/core/filter/filter.go

@@ -0,0 +1,41 @@
+// Copyright (c) 2025 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package filter implements a filter for commit events.
+package filter
+
+import (
+	"strings"
+
+	"github.com/uber/submitqueue/stovepipe/entity"
+)
+
+// Config controls which VCS URIs are watched.
+// WatchedURIPrefixes is a list of URI prefixes to match against CommitEvent.URI.
+// Example: "git://github.com/uber/go-code/refs/heads/main"
+// watches all commits on the main branch of uber/go-code.
+type Config struct {
+	WatchedURIPrefixes []string
+}
+
+// ShouldProcess returns true if the commit event's URI matches
+// any of the configured watched prefixes.
+func ShouldProcess(cfg Config, event entity.CommitEvent) bool {
+	for _, prefix := range cfg.WatchedURIPrefixes {
+		if strings.HasPrefix(event.URI, prefix) {
+			return true
+		}
+	}
+	return false
+}

stovepipe/entity/entity.go

@@ -4,13 +4,37 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//     http://www.apache.org/licenses/LICENSE-2.0
+//	http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
-
-// Package entity holds Stovepipe-specific domain types (distinct from shared repo entity/).
 package entity
+
+// CommitEvent represents a new commit detected on a VCS remote.
+// It is intentionally VCS-agnostic: the URI scheme carries the
+// provider identity, mirroring the github:// scheme used in
+// SubmitQueue's ChangeInfo.
+//
+// URI format: "git://<host>/<repo>/<ref>/<new-revision>"
+// Example:    "git://github.com/uber/go-code/refs/heads/main/c3a4d5e6f789..."
+//
+// Fields are immutable after construction.
+type CommitEvent struct {
+	// URI identifies the new commit state using a VCS-agnostic scheme.
+	URI string `json:"uri"`
+	// PriorURI identifies the prior state before this event. Empty if unknown. Scheme and host match URI.
+	PreviousURI string `json:"previous_uri,omitempty"`
+	// Author is the identity of the commit author or event initiator.
+	Author Author `json:"author"`
+}
+
+// Author identifies the person who authored a commit.
+type Author struct {
+	// Name is the display name of the author.
+	Name string `json:"name"`
+	// Email is the email address of the author.
+	Email string `json:"email,omitempty"`
+}

stovepipe/extension/commitingester/logging.go

@@ -0,0 +1,32 @@
+// Copyright (c) 2025 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package commitingester provides CommitEventHandler implementations.
+package commitingester
+
+import (
+	"context"
+
+	"github.com/uber/submitqueue/stovepipe/entity"
+)
+
+// LoggingHandler is a stub CommitEventHandler that logs received commit events.
+// Replace with real DB/pipeline logic once schema is ready.
+type LoggingHandler struct{}
+
+func (LoggingHandler) HandlePushEvent(ctx context.Context, event entity.PushEvent) error {
+	// Caller (the Kafka consumer in go-code) is responsible for actual logging.
+	// This stub is intentionally a no-op at the OSS layer.
+	return nil
+}

stovepipe/extension/extension.go

@@ -14,3 +14,21 @@
 
 // Package extension holds Stovepipe-specific extension implementations.
 package extension
+
+import (
+	"context"
+
+	"github.com/uber/submitqueue/stovepipe/entity"
+)
+
+// CommitIngester subscribes to commit events from a VCS source
+// and dispatches them for processing. The source and VCS are
+// implementation details left to the injected backend.
+type CommitIngester interface {
+	Start(ctx context.Context) error
+}
+
+// CommitEventHandler processes a single commit event received from the ingester.
+type CommitEventHandler interface {
+	HandleCommitEvent(ctx context.Context, event entity.CommitEvent) error
+}