Method perform_cache_write_action

src/proxy/http/HttpSM.cc:6488–6554

void HttpSM::perform_cache_write_action() Called to do cache write, delete and updates based on s->cache_info.action. Does not setup cache read tunnels

//    read tunnels
//
void
HttpSM::perform_cache_write_action()
{
  SMDbg(dbg_ctl_http, "%s", HttpDebugNames::get_cache_action_name(t_state.cache_info.action));

  switch (t_state.cache_info.action) {
  case HttpTransact::CACHE_DO_NO_ACTION:

  {
    // Nothing to do
    cache_sm.end_both();
    break;
  }

  case HttpTransact::CACHE_DO_SERVE: {
    cache_sm.abort_write();
    break;
  }

  case HttpTransact::CACHE_DO_DELETE: {
    // Write close deletes the old alternate
    cache_sm.close_write();
    cache_sm.close_read();
    t_state.cache_info.write_lock_state = HttpTransact::CACHE_WL_INIT;
    break;
  }

  case HttpTransact::CACHE_DO_SERVE_AND_DELETE: {
    // FIX ME: need to set up delete for after cache write has
    //   completed
    break;
  }

  case HttpTransact::CACHE_DO_SERVE_AND_UPDATE: {
    issue_cache_update();
    break;
  }

  case HttpTransact::CACHE_DO_UPDATE: {
    cache_sm.close_read();
    issue_cache_update();
    break;
  }

  case HttpTransact::CACHE_DO_WRITE:
  case HttpTransact::CACHE_DO_REPLACE:
    // Fix need to set up delete for after cache write has
    //   completed
    if (transform_info.entry == nullptr || t_state.api_info.cache_untransformed == true) {
      cache_sm.close_read();
      t_state.cache_info.write_status = HttpTransact::CACHE_WRITE_IN_PROGRESS;
      setup_cache_write_transfer(&cache_sm, server_entry->vc, &t_state.cache_info.object_store, client_response_hdr_bytes,
                                 "cache write");
    } else {
      // We are not caching the untransformed.  We might want to
      //  use the cache writevc to cache the transformed copy
      ink_assert(transform_cache_sm.cache_write_vc == nullptr);
      transform_cache_sm.cache_write_vc = cache_sm.cache_write_vc;