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| 1 | +// SPDX-License-Identifier: AGPL-3.0-or-later |
| 2 | + |
| 3 | +package webhook |
| 4 | + |
| 5 | +import ( |
| 6 | + "context" |
| 7 | + "crypto/sha256" |
| 8 | + "encoding/hex" |
| 9 | + "encoding/json" |
| 10 | + "errors" |
| 11 | + "fmt" |
| 12 | + "log/slog" |
| 13 | + "strconv" |
| 14 | + "time" |
| 15 | + |
| 16 | + "github.com/jackc/pgx/v5" |
| 17 | + "github.com/jackc/pgx/v5/pgtype" |
| 18 | + "github.com/jackc/pgx/v5/pgxpool" |
| 19 | + |
| 20 | + "github.com/tenseleyFlow/shithub/internal/worker" |
| 21 | + webhookdb "github.com/tenseleyFlow/shithub/internal/webhook/sqlc" |
| 22 | +) |
| 23 | + |
| 24 | +// FanoutConsumer is the consumer name in domain_events_processed. |
| 25 | +// Distinct from notif's so cursors don't collide. |
| 26 | +const FanoutConsumer = "webhook_fanout" |
| 27 | + |
| 28 | +// FanoutBatch caps how many events a single tick drains. |
| 29 | +const FanoutBatch = 200 |
| 30 | + |
| 31 | +// FanoutDeps wires the fan-out against the runtime. |
| 32 | +type FanoutDeps struct { |
| 33 | + Pool *pgxpool.Pool |
| 34 | + Logger *slog.Logger |
| 35 | +} |
| 36 | + |
| 37 | +// FanoutOnce drains domain_events past the persisted cursor, finds |
| 38 | +// matching webhooks, and inserts a webhook_deliveries row + enqueues a |
| 39 | +// `webhook:deliver` job per match. Returns the number of events |
| 40 | +// processed; the caller decides to re-enqueue when full. |
| 41 | +// |
| 42 | +// The consumer cursor is advanced after each event regardless of |
| 43 | +// whether the event matched any subscribers — an event without |
| 44 | +// subscribers is "processed" the same as one with five. |
| 45 | +func FanoutOnce(ctx context.Context, deps FanoutDeps) (int, error) { |
| 46 | + if deps.Pool == nil { |
| 47 | + return 0, errors.New("webhook fanout: nil Pool") |
| 48 | + } |
| 49 | + q := webhookdb.New() |
| 50 | + cur, err := q.GetWebhookCursor(ctx, deps.Pool, FanoutConsumer) |
| 51 | + last := int64(0) |
| 52 | + if err == nil { |
| 53 | + last = cur.LastEventID |
| 54 | + } else if !errors.Is(err, pgx.ErrNoRows) { |
| 55 | + return 0, fmt.Errorf("webhook fanout: load cursor: %w", err) |
| 56 | + } |
| 57 | + rows, err := q.ListUnprocessedDomainEvents(ctx, deps.Pool, webhookdb.ListUnprocessedDomainEventsParams{ |
| 58 | + ID: last, |
| 59 | + Limit: FanoutBatch, |
| 60 | + }) |
| 61 | + if err != nil { |
| 62 | + return 0, fmt.Errorf("webhook fanout: list events: %w", err) |
| 63 | + } |
| 64 | + processed := 0 |
| 65 | + for _, ev := range rows { |
| 66 | + if err := dispatchEvent(ctx, deps, q, ev); err != nil { |
| 67 | + if deps.Logger != nil { |
| 68 | + deps.Logger.WarnContext(ctx, "webhook fanout: dispatch failed", |
| 69 | + "event_id", ev.ID, "kind", ev.Kind, "error", err) |
| 70 | + } |
| 71 | + break |
| 72 | + } |
| 73 | + last = ev.ID |
| 74 | + processed++ |
| 75 | + } |
| 76 | + if processed > 0 { |
| 77 | + if err := q.SetWebhookCursor(ctx, deps.Pool, webhookdb.SetWebhookCursorParams{ |
| 78 | + Consumer: FanoutConsumer, LastEventID: last, |
| 79 | + }); err != nil { |
| 80 | + return processed, fmt.Errorf("webhook fanout: persist cursor: %w", err) |
| 81 | + } |
| 82 | + } |
| 83 | + return processed, nil |
| 84 | +} |
| 85 | + |
| 86 | +// dispatchEvent finds matching webhooks for one domain event, creates |
| 87 | +// delivery rows, and enqueues per-row deliver jobs. |
| 88 | +func dispatchEvent(ctx context.Context, deps FanoutDeps, q *webhookdb.Queries, ev webhookdb.DomainEvent) error { |
| 89 | + // Resolve the owner pool. Repo events may match repo-level |
| 90 | + // webhooks AND the org-level webhooks (when the repo is org-owned). |
| 91 | + // User-owned repos have no second bucket. |
| 92 | + subs := []webhookdb.Webhook{} |
| 93 | + if ev.RepoID.Valid { |
| 94 | + repoSubs, err := q.ListActiveWebhooksForOwner(ctx, deps.Pool, webhookdb.ListActiveWebhooksForOwnerParams{ |
| 95 | + OwnerKind: webhookdb.WebhookOwnerKindRepo, |
| 96 | + OwnerID: ev.RepoID.Int64, |
| 97 | + }) |
| 98 | + if err != nil { |
| 99 | + return fmt.Errorf("list repo webhooks: %w", err) |
| 100 | + } |
| 101 | + subs = append(subs, repoSubs...) |
| 102 | + // Org-level: look up the repo's owner_org_id; only org-owned |
| 103 | + // repos pick up org-level webhooks. |
| 104 | + owner, err := q.GetRepoOwnerKindForFanout(ctx, deps.Pool, ev.RepoID.Int64) |
| 105 | + if err == nil && owner.OwnerOrgID.Valid { |
| 106 | + orgSubs, err := q.ListActiveWebhooksForOwner(ctx, deps.Pool, webhookdb.ListActiveWebhooksForOwnerParams{ |
| 107 | + OwnerKind: webhookdb.WebhookOwnerKindOrg, |
| 108 | + OwnerID: owner.OwnerOrgID.Int64, |
| 109 | + }) |
| 110 | + if err != nil { |
| 111 | + return fmt.Errorf("list org webhooks: %w", err) |
| 112 | + } |
| 113 | + subs = append(subs, orgSubs...) |
| 114 | + } |
| 115 | + } |
| 116 | + if len(subs) == 0 { |
| 117 | + return nil |
| 118 | + } |
| 119 | + for _, w := range subs { |
| 120 | + if !subscribesToKind(w.Events, ev.Kind) { |
| 121 | + continue |
| 122 | + } |
| 123 | + body, headersJSON, err := buildPayload(ev, w) |
| 124 | + if err != nil { |
| 125 | + if deps.Logger != nil { |
| 126 | + deps.Logger.WarnContext(ctx, "webhook fanout: build payload", |
| 127 | + "event_id", ev.ID, "webhook_id", w.ID, "error", err) |
| 128 | + } |
| 129 | + continue |
| 130 | + } |
| 131 | + idem := idempotencyKey(w.ID, ev.ID, body) |
| 132 | + row, err := q.CreateDelivery(ctx, deps.Pool, webhookdb.CreateDeliveryParams{ |
| 133 | + WebhookID: w.ID, |
| 134 | + EventKind: ev.Kind, |
| 135 | + EventID: pgtype.Int8{Int64: ev.ID, Valid: true}, |
| 136 | + Payload: body, |
| 137 | + RequestHeaders: headersJSON, |
| 138 | + RequestBody: body, |
| 139 | + Attempt: 1, |
| 140 | + MaxAttempts: 8, |
| 141 | + NextRetryAt: pgtype.Timestamptz{Time: time.Now(), Valid: true}, |
| 142 | + Status: webhookdb.WebhookDeliveryStatusPending, |
| 143 | + IdempotencyKey: idem, |
| 144 | + RedeliverOf: pgtype.Int8{Valid: false}, |
| 145 | + }) |
| 146 | + if err != nil { |
| 147 | + return fmt.Errorf("create delivery: %w", err) |
| 148 | + } |
| 149 | + if _, err := worker.Enqueue(ctx, deps.Pool, KindWebhookDeliver, |
| 150 | + deliverPayload{DeliveryID: row.ID}, worker.EnqueueOptions{}); err != nil && deps.Logger != nil { |
| 151 | + deps.Logger.WarnContext(ctx, "webhook fanout: enqueue deliver", |
| 152 | + "delivery_id", row.ID, "error", err) |
| 153 | + } |
| 154 | + } |
| 155 | + return nil |
| 156 | +} |
| 157 | + |
| 158 | +// subscribesToKind returns true when the webhook's `events` filter |
| 159 | +// either is empty (= "all") or contains the event kind. |
| 160 | +func subscribesToKind(events []string, kind string) bool { |
| 161 | + if len(events) == 0 { |
| 162 | + return true |
| 163 | + } |
| 164 | + for _, e := range events { |
| 165 | + if e == kind || e == "*" { |
| 166 | + return true |
| 167 | + } |
| 168 | + } |
| 169 | + return false |
| 170 | +} |
| 171 | + |
| 172 | +// buildPayload assembles the JSON body for delivery. We pass the |
| 173 | +// domain_events row through verbatim under `event` plus a tiny |
| 174 | +// envelope; subscribers care about both the kind and the payload. |
| 175 | +func buildPayload(ev webhookdb.DomainEvent, w webhookdb.Webhook) (body []byte, headers []byte, err error) { |
| 176 | + envelope := map[string]any{ |
| 177 | + "event_id": ev.ID, |
| 178 | + "event_kind": ev.Kind, |
| 179 | + "created_at": ev.CreatedAt.Time.UTC().Format(time.RFC3339Nano), |
| 180 | + "webhook_id": w.ID, |
| 181 | + "payload": json.RawMessage(ev.Payload), |
| 182 | + } |
| 183 | + if ev.RepoID.Valid { |
| 184 | + envelope["repo_id"] = ev.RepoID.Int64 |
| 185 | + } |
| 186 | + if ev.ActorUserID.Valid { |
| 187 | + envelope["actor_user_id"] = ev.ActorUserID.Int64 |
| 188 | + } |
| 189 | + body, err = json.Marshal(envelope) |
| 190 | + if err != nil { |
| 191 | + return nil, nil, err |
| 192 | + } |
| 193 | + hdrs := map[string]any{ |
| 194 | + "User-Agent": "shithub-Hookshot", |
| 195 | + "Content-Type": contentTypeHeader(w.ContentType), |
| 196 | + "X-Shithub-Event": ev.Kind, |
| 197 | + "X-Shithub-Hook-Installation-Target-Type": string(w.OwnerKind), |
| 198 | + "X-Shithub-Hook-Installation-Target-Id": strconv.FormatInt(w.OwnerID, 10), |
| 199 | + } |
| 200 | + headers, err = json.Marshal(hdrs) |
| 201 | + if err != nil { |
| 202 | + return nil, nil, err |
| 203 | + } |
| 204 | + return body, headers, nil |
| 205 | +} |
| 206 | + |
| 207 | +// contentTypeHeader maps the enum to its on-the-wire MIME. |
| 208 | +func contentTypeHeader(ct webhookdb.WebhookContentType) string { |
| 209 | + switch ct { |
| 210 | + case webhookdb.WebhookContentTypeForm: |
| 211 | + return "application/x-www-form-urlencoded" |
| 212 | + default: |
| 213 | + return "application/json" |
| 214 | + } |
| 215 | +} |
| 216 | + |
| 217 | +// idempotencyKey is sha256(payload || webhook_id || event_id). Stable |
| 218 | +// across retries so subscribers can dedupe. |
| 219 | +func idempotencyKey(webhookID, eventID int64, body []byte) string { |
| 220 | + h := sha256.New() |
| 221 | + h.Write(body) |
| 222 | + h.Write([]byte(strconv.FormatInt(webhookID, 10))) |
| 223 | + h.Write([]byte(strconv.FormatInt(eventID, 10))) |
| 224 | + return hex.EncodeToString(h.Sum(nil)) |
| 225 | +} |
