解决问题

对于通过Rpc推送交易上链，因超时等因素导致无返回交易id或者失败，实际交易已上链。

解决方案

在推送交易时附加一个action，action可以填一个与此次推送任务对应的唯一值mark，并把当前链的块高度记下

void addmark( const name& owner, const string& mark )
{
   require_auth( owner );
}

然后mongo会把这个action数据以及对应的交易Id 洗出来

bool
mongo_db_plugin_impl::add_action_trace( mongocxx::bulk_write& bulk_action_traces, const chain::action_trace& atrace,
                                        const chain::transaction_trace_ptr& t,
                                        bool executed, const std::chrono::milliseconds& now,
                                        bool& write_ttrace )
{
   using namespace bsoncxx::types;
   using bsoncxx::builder::basic::kvp;

   const auto block_time = std::chrono::duration_cast<std::chrono::milliseconds>(
               std::chrono::microseconds{atrace.block_time.to_time_point().time_since_epoch().count()} );

   if( executed && atrace.receipt->receiver == chain::config::system_account_name ) {
      update_account( atrace, now, block_time );
   }
   .....
   else if(atrace.act.name == name("addmark")) {
      add_trx_marks( atrace, now, block_time );
   }

void mongo_db_plugin_impl::add_trx_marks( const chain::action_trace& atrace, const std::chrono::milliseconds& now, const std::chrono::milliseconds& block_time ) {
   using namespace bsoncxx::types;
   using bsoncxx::builder::basic::kvp;
   using bsoncxx::builder::basic::make_document;

   auto addma = fc::raw::unpack<mongo_db_plugin::addmark>(atrace.act.data);

   auto doc = make_document( 
                           kvp( "mark", addma.mark),
                           kvp( "trx_id", atrace.trx_id.str()),
                           kvp( "owner", addma.owner.to_string()),
                           kvp( "contract",atrace.receipt.receiver.to_string()),
                           kvp( "block_time", b_date{block_time}),
                           kvp( "block_timestamp", block_time.count()),
                           kvp( "createdAt", b_date{now} ));

   try {
      if( !_trx_marks.insert_one(doc.view())) {
         EOS_ASSERT( false, chain::mongo_db_insert_fail, "Failed to insert _trx_marks ${name} : ${mark}", ("name", addma.owner.to_string())("mark", addma.mark) );
      }
   } catch (...) {
      handle_mongo_exception( "_trx_marks", __LINE__ );
   }
}

测试查询记录

也就是如果推送没返回交易id,可以尝试查洗出的这个表，如果有的话，使用对应的交易id做数据补全。

{
    "_id" : ObjectId("5df34b721e722d468e02260f"),
    "mark" : "944c1698dc62c1817cc02c68207c47bf85dfc7e830839d2ab7267899bb04ada9",
    "trx_id" : "0e65b2b921019604b7928fdea11fe4e02e10550fe50fe767cbb84043b245e5ee",
    "owner" : "bcskillsurou",
    "contract" : "eosio.token",
    "block_time" : ISODate("2019-12-13T08:27:30.000Z"),
    "block_timestamp" : NumberLong(1576225650000),
    "createdAt" : ISODate("2019-12-13T08:27:30.028Z")
}

如果超过一段时间，且判断mongo中块高度增长正常，且超过前面记下的块高度一段距离（以防意外的话，就是超过当前最新区块与不可逆块的差）【防止mongo同步问题】，也没记录的话，就可以判定失败了。