chore: fully implement enterprise audit pkg (#3821)

enterprise/audit/backends/postgres.go

@@ -0,0 +1,40 @@
+package backends
+
+import (
+	"context"
+
+	"golang.org/x/xerrors"
+
+	"github.com/coder/coder/coderd/database"
+	"github.com/coder/coder/enterprise/audit"
+)
+
+type postgresBackend struct {
+	// internal indicates if the exporter is exporting to the Postgres database
+	// that the rest of Coderd uses. Since this is a generic Postgres exporter,
+	// we make different decisions to store the audit log based on if it's
+	// pointing to the Coderd database.
+	internal bool
+	db       database.Store
+}
+
+func NewPostgres(db database.Store, internal bool) audit.Backend {
+	return &postgresBackend{db: db, internal: internal}
+}
+
+func (b *postgresBackend) Decision() audit.FilterDecision {
+	if b.internal {
+		return audit.FilterDecisionStore
+	}
+
+	return audit.FilterDecisionExport
+}
+
+func (b *postgresBackend) Export(ctx context.Context, alog database.AuditLog) error {
+	_, err := b.db.InsertAuditLog(ctx, database.InsertAuditLogParams(alog))
+	if err != nil {
+		return xerrors.Errorf("insert audit log: %w", err)
+	}
+
+	return nil
+}