From a4b30ea77cda182b2e158594af5c5a4f1236a15e Mon Sep 17 00:00:00 2001
From: Zaiming Shi <zmstone@gmail.com>
Date: Tue, 23 Mar 2021 19:58:22 +0100
Subject: [PATCH] feat(emqx): Add backtrace_depth configuration

---
 etc/emqx.conf    | 2 ++
 priv/emqx.schema | 5 +++++
 src/emqx_app.erl | 9 +++++++--
 3 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/etc/emqx.conf b/etc/emqx.conf
index 70320e91b..1eebed652 100644
--- a/etc/emqx.conf
+++ b/etc/emqx.conf
@@ -301,6 +301,8 @@ node.crash_dump = {{ platform_log_dir }}/crash.dump
 node.dist_listen_min = 6369
 node.dist_listen_max = 6369
 
+node.backtrace_depth = 16
+
 ## CONFIG_SECTION_BGN=rpc ======================================================
 
 ## RPC Mode.
diff --git a/priv/emqx.schema b/priv/emqx.schema
index 2e1248c50..d254c24e6 100644
--- a/priv/emqx.schema
+++ b/priv/emqx.schema
@@ -334,6 +334,11 @@ end}.
   hidden
 ]}.
 
+{mapping, "node.backtrace_depth", "emqx.backtrace_depth", [
+  {default, 16},
+  {datatype, integer}
+]}.
+
 %%--------------------------------------------------------------------
 %% RPC
 %%--------------------------------------------------------------------
diff --git a/src/emqx_app.erl b/src/emqx_app.erl
index ca1a2ce09..ca6ce1073 100644
--- a/src/emqx_app.erl
+++ b/src/emqx_app.erl
@@ -33,6 +33,7 @@
 %%--------------------------------------------------------------------
 
 start(_Type, _Args) ->
+    set_backtrace_depth(),
     print_otp_version_warning(),
     print_banner(),
     ekka:start(),
@@ -40,8 +41,7 @@ start(_Type, _Args) ->
     ok = start_autocluster(),
     ok = emqx_plugins:init(),
     _ = emqx_plugins:load(),
-    emqx_boot:is_enabled(listeners)
-      andalso (ok = emqx_listeners:start()),
+    emqx_boot:is_enabled(listeners) andalso (ok = emqx_listeners:start()),
     register(emqx, self()),
     ok = emqx_alarm_handler:load(),
     print_vsn(),
@@ -53,6 +53,11 @@ stop(_State) ->
     emqx_boot:is_enabled(listeners)
       andalso emqx_listeners:stop().
 
+set_backtrace_depth() ->
+    Depth = application:get_env(?APP, backtrace_depth, 16),
+    _ = erlang:system_flag(backtrace_depth, Depth),
+    ok.
+
 %%--------------------------------------------------------------------
 %% Print Banner
 %%--------------------------------------------------------------------