feat: add support for node 6.8.1 back (#1335)

Dockerfile

@@ -40,7 +40,7 @@ WORKDIR /home/aeternity/node
 
 # Download, and unzip latest aeternity release archive
 ENV NODEROOT=/home/aeternity/node/local
-ARG NODE_VERSION=6.7.0
+ARG NODE_VERSION=6.8.1
 ARG NODE_URL=https://github.com/aeternity/aeternity/releases/download/v${NODE_VERSION}/aeternity-v${NODE_VERSION}-ubuntu-x86_64.tar.gz
 ENV NODEDIR=/home/aeternity/node/local/rel/aeternity
 RUN mkdir -p ./local/rel/aeternity/data/mnesia

lib/ae_mdw/contract.ex

@@ -447,7 +447,7 @@ defmodule AeMdw.Contract do
       {:ok, _, _, events} =
         :aec_block_micro_candidate.apply_block_txs_strict(txs_taken, trees_in, env)
 
-      Enum.reverse(events)
+      events
     else
       []
     end

lib/ae_mdw/db/sync/contract.ex

@@ -25,6 +25,8 @@ defmodule AeMdw.Db.Sync.Contract do
 
   @type call_record() :: tuple()
 
+  @contract_create_fnames ~w(Chain.create Chain.clone Call.create Call.clone)
+
   @spec child_contract_mutations(
           Contract.fun_arg_res_or_error(),
           Blocks.block_index(),
@@ -55,6 +57,16 @@ defmodule AeMdw.Db.Sync.Contract do
           Mutation.t()
         ]
   def events_mutations(events, block_index, call_txi, call_tx_hash, contract_pk) do
+    events =
+      Enum.filter(
+        events,
+        &match?(
+          {{:internal_call_tx, fname}, %{info: aetx}}
+          when is_tuple(aetx) or fname in @contract_create_fnames,
+          &1
+        )
+      )
+
     shifted_events = [nil | events]
 
     # This function relies on a property that every Chain.clone and Chain.create
@@ -63,10 +75,8 @@ defmodule AeMdw.Db.Sync.Contract do
     {chain_events, non_chain_events} =
       shifted_events
       |> Enum.zip(events)
-      |> Enum.split_with(fn
-        {_prev_event, {{:internal_call_tx, "Chain.create"}, _info}} -> true
-        {_prev_event, {{:internal_call_tx, "Chain.clone"}, _info}} -> true
-        {_prev_event, {{:internal_call_tx, _fname}, _info}} -> false
+      |> Enum.split_with(fn {_prev_event, {{:internal_call_tx, fname}, _info}} ->
+        fname in @contract_create_fnames
       end)
 
     chain_mutations =