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-rw-r--r--lib/kernel/doc/src/logger.xml61
-rw-r--r--lib/kernel/doc/src/logger_chapter.xml55
-rw-r--r--lib/kernel/src/logger.erl41
-rw-r--r--lib/kernel/src/logger_olp.erl11
-rw-r--r--lib/kernel/src/logger_proxy.erl15
-rw-r--r--lib/kernel/test/logger_proxy_SUITE.erl43
6 files changed, 204 insertions, 22 deletions
diff --git a/lib/kernel/doc/src/logger.xml b/lib/kernel/doc/src/logger.xml
index e09c5db5e3..0668676096 100644
--- a/lib/kernel/doc/src/logger.xml
+++ b/lib/kernel/doc/src/logger.xml
@@ -245,6 +245,12 @@ logger:error("error happened because: ~p", [Reason]). % Without macro
</desc>
</datatype>
<datatype>
+ <name name="olp_config"/>
+ <desc>
+ <p></p>
+ </desc>
+ </datatype>
+ <datatype>
<name name="primary_config"/>
<desc>
<p>Primary configuration data for Logger. The following
@@ -597,8 +603,8 @@ start(_, []) ->
<name name="get_config" arity="0" since="OTP 21.0"/>
<fsummary>Look up the current Logger configuration</fsummary>
<desc>
- <p>Look up all current Logger configuration, including primary
- and handler configuration, and module level settings.</p>
+ <p>Look up all current Logger configuration, including primary,
+ handler, and proxy configuration, and module level settings.</p>
</desc>
</func>
@@ -636,6 +642,17 @@ start(_, []) ->
</func>
<func>
+ <name name="get_proxy_config" arity="0" since="OTP 21.3"/>
+ <fsummary>Look up the current configuration for the Logger proxy.</fsummary>
+ <desc>
+ <p>Look up the current configuration for the Logger proxy.</p>
+ <p>For more information about the proxy, see
+ section <seealso marker="logger_chapter#proxy">Logger
+ Proxy</seealso> in the Kernel User's Guide.</p>
+ </desc>
+ </func>
+
+ <func>
<name name="get_module_level" arity="0" since="OTP 21.0"/>
<fsummary>Look up all current module levels.</fsummary>
<desc>
@@ -801,6 +818,27 @@ start(_, []) ->
</func>
<func>
+ <name name="set_proxy_config" arity="1" since="OTP 21.3"/>
+ <fsummary>Set configuration data for the Logger proxy.</fsummary>
+ <desc>
+ <p>Set configuration data for the Logger proxy. This
+ overwrites the current proxy configuration. Keys that are not
+ specified in the <c><anno>Config</anno></c> map gets default
+ values.</p>
+ <p>To modify the existing configuration,
+ use <seealso marker="#update_proxy_config-1">
+ <c>update_proxy_config/1</c></seealso>, or, if a more
+ complex merge is needed, read the current configuration
+ with <seealso marker="#get_proxy_config-0"><c>get_proxy_config/0</c>
+ </seealso>, then do the merge before writing the new
+ configuration back with this function.</p>
+ <p>For more information about the proxy, see
+ section <seealso marker="logger_chapter#proxy">Logger
+ Proxy</seealso> in the Kernel User's Guide.</p>
+ </desc>
+ </func>
+
+ <func>
<name name="set_module_level" arity="2" since="OTP 21.0"/>
<fsummary>Set the log level for the specified modules.</fsummary>
<desc>
@@ -1013,6 +1051,25 @@ logger:set_process_metadata(maps:merge(logger:get_process_metadata(), Meta)).
</seealso>.</p>
</desc>
</func>
+
+ <func>
+ <name name="update_proxy_config" arity="1" since="OTP 21.3"/>
+ <fsummary>Update configuration data for the Logger proxy.</fsummary>
+ <desc>
+ <p>Update configuration data for the Logger proxy. This function
+ behaves as if it was implemented as follows:</p>
+ <code type="erl">
+Old = logger:get_proxy_config(),
+logger:set_proxy_config(maps:merge(Old, Config)).
+ </code>
+ <p>To overwrite the existing configuration without any merge,
+ use <seealso marker="#set_proxy_config-1"><c>set_proxy_config/1</c>
+ </seealso>.</p>
+ <p>For more information about the proxy, see
+ section <seealso marker="logger_chapter#proxy">Logger
+ Proxy</seealso> in the Kernel User's Guide.</p>
+ </desc>
+ </func>
</funcs>
<section>
diff --git a/lib/kernel/doc/src/logger_chapter.xml b/lib/kernel/doc/src/logger_chapter.xml
index 458e61cef5..5ed7397135 100644
--- a/lib/kernel/doc/src/logger_chapter.xml
+++ b/lib/kernel/doc/src/logger_chapter.xml
@@ -693,8 +693,10 @@ logger:debug(#{got => connection_request, id => Id, state => State},
with <seealso marker="#logger_sasl_compatible">
<c>logger_sasl_compatible</c></seealso>.</p>
<p>With this parameter, you can modify or disable the default
- handler, add custom handlers and primary logger filters, and
- set log levels per module.</p>
+ handler, add custom handlers and primary logger filters, set
+ log levels per module, and modify
+ the <seealso marker="#proxy">proxy</seealso>
+ configuration.</p>
<p><c>Config</c> is any (zero or more) of the following:</p>
<taglist>
<tag><c>{handler, default, undefined}</c></tag>
@@ -746,6 +748,14 @@ logger:debug(#{got => connection_request, id => Id, state => State},
<p>for each <c>Module</c>.</p>
<p>Multiple entries of this type are allowed.</p>
</item>
+ <tag><c>{proxy, ProxyConfig}</c></tag>
+ <item>
+ <p>Sets the proxy configuration, equivalent to calling</p>
+ <pre><seealso marker="logger#set_proxy_config/1">
+ logger:set_proxy_config(ProxyConfig)
+ </seealso></pre>
+ <p>Only one entry of this type is allowed.</p>
+ </item>
</taglist>
<p>See
section <seealso marker="#config_examples">Configuration
@@ -1334,9 +1344,50 @@ logger:add_handler(my_disk_log_h, logger_disk_log_h,
</section>
<section>
+ <marker id="proxy"/>
+ <title>Logger Proxy</title>
+ <p>The Logger proxy is an Erlang process which is part of the
+ Kernel application's supervision tree. During startup, the proxy
+ process registers itself as the <c>system_logger</c>, meaning
+ that log events produced by the emulator are sent to this
+ process.</p>
+ <p>When a log event is issued on a process which has its group
+ leader on a remote node, Logger automatically forwards the log
+ event to the group leader's node. To achieve this, it first
+ sends the log event as an Erlang message from the original
+ client process to the proxy on the local node, and the proxy in
+ turn forwards the event to the proxy on the remote node.</p>
+ <p>When receiving a log event, either from the emulator or from a
+ remote node, the proxy calls the Logger API to log the event.</p>
+ <p>The proxy process is overload protected in the same way as
+ described in
+ section <seealso marker="#overload_protection">Protecting the
+ Handler from Overload</seealso>, but with the following default
+ values:</p>
+ <code>
+ #{sync_mode_qlen => 500,
+ drop_mode_qlen => 1000,
+ flush_qlen => 5000,
+ burst_limit_enable => false,
+ overload_kill_enable => false}</code>
+ <p>For log events from the emulator, synchronous message passing
+ mode is not applicable, since all messages are passed
+ asynchronously by the emulator. Drop mode is achieved by setting
+ the <c>system_logger</c> to <c>undefined</c>, forcing the
+ emulator to drop events until it is set back to the proxy pid
+ again.</p>
+ <p>The proxy uses <seealso marker="erts:erlang#send_nosuspend/2">
+ <c>erlang:send_nosuspend/2</c></seealso> when sending log
+ events to a remote node. If the message could not be sent
+ without suspending the sender, it is dropped. This is to avoid
+ blocking the proxy process.</p>
+ </section>
+
+ <section>
<title>See Also</title>
<p>
<seealso marker="disk_log"><c>disk_log(3)</c></seealso>,
+ <seealso marker="erts:erlang"><c>erlang(3)</c></seealso>,
<seealso marker="error_logger"><c>error_logger(3)</c></seealso>,
<seealso marker="logger"><c>logger(3)</c></seealso>,
<seealso marker="logger_disk_log_h"><c>logger_disk_log_h(3)</c></seealso>,
diff --git a/lib/kernel/src/logger.erl b/lib/kernel/src/logger.erl
index 1611d489e6..0ab3addfef 100644
--- a/lib/kernel/src/logger.erl
+++ b/lib/kernel/src/logger.erl
@@ -43,11 +43,14 @@
get_module_level/0, get_module_level/1,
set_primary_config/1, set_primary_config/2,
set_handler_config/2, set_handler_config/3,
+ set_proxy_config/1,
update_primary_config/1,
update_handler_config/2, update_handler_config/3,
+ update_proxy_config/1,
update_formatter_config/2, update_formatter_config/3,
get_primary_config/0, get_handler_config/1,
get_handler_config/0, get_handler_ids/0, get_config/0,
+ get_proxy_config/0,
add_handlers/1]).
%% Private configuration
@@ -122,6 +125,18 @@
{filters,log | stop,[{filter_id(),filter()}]} |
{module_level,level(),[module()]}].
+-type olp_config() :: #{sync_mode_qlen => non_neg_integer(),
+ drop_mode_qlen => pos_integer(),
+ flush_qlen => pos_integer(),
+ burst_limit_enable => boolean(),
+ burst_limit_max_count => pos_integer(),
+ burst_limit_window_time => pos_integer(),
+ overload_kill_enable => boolean(),
+ overload_kill_qlen => pos_integer(),
+ overload_kill_mem_size => pos_integer(),
+ overload_kill_restart_after =>
+ non_neg_integer() | infinity}.
+
-export_type([log_event/0,
level/0,
report/0,
@@ -137,7 +152,8 @@
filter_arg/0,
filter_return/0,
config_handler/0,
- formatter_config/0]).
+ formatter_config/0,
+ olp_config/0]).
%%%-----------------------------------------------------------------
%%% API
@@ -390,6 +406,7 @@ set_primary_config(Key,Value) ->
set_primary_config(Config) ->
logger_server:set_config(primary,Config).
+
-spec set_handler_config(HandlerId,level,Level) -> Return when
HandlerId :: handler_id(),
Level :: level() | all | none,
@@ -419,6 +436,14 @@ set_handler_config(HandlerId,Key,Value) ->
set_handler_config(HandlerId,Config) ->
logger_server:set_config(HandlerId,Config).
+-spec set_proxy_config(Config) -> ok | {error,term()} when
+ Config :: olp_config().
+set_proxy_config(Config) when is_map(Config) ->
+ Defaults = logger_proxy:get_default_config(),
+ logger_olp:set_opts(logger_proxy,maps:merge(Defaults,Config));
+set_proxy_config(Config) ->
+ {error,{invalid_config,Config}}.
+
-spec update_primary_config(Config) -> ok | {error,term()} when
Config :: primary_config().
update_primary_config(Config) ->
@@ -453,6 +478,13 @@ update_handler_config(HandlerId,Key,Value) ->
update_handler_config(HandlerId,Config) ->
logger_server:update_config(HandlerId,Config).
+-spec update_proxy_config(Config) -> ok | {error,term()} when
+ Config :: olp_config().
+update_proxy_config(Config) when is_map(Config) ->
+ logger_olp:set_opts(logger_proxy,Config);
+update_proxy_config(Config) ->
+ {error,{invalid_config,Config}}.
+
-spec get_primary_config() -> Config when
Config :: primary_config().
get_primary_config() ->
@@ -486,6 +518,11 @@ get_handler_ids() ->
{ok,#{handlers:=HandlerIds}} = logger_config:get(?LOGGER_TABLE,primary),
HandlerIds.
+-spec get_proxy_config() -> Config when
+ Config :: olp_config().
+get_proxy_config() ->
+ logger_olp:get_opts(logger_proxy).
+
-spec update_formatter_config(HandlerId,FormatterConfig) ->
ok | {error,term()} when
HandlerId :: handler_id(),
@@ -606,10 +643,12 @@ unset_process_metadata() ->
-spec get_config() -> #{primary=>primary_config(),
handlers=>[handler_config()],
+ proxy=>olp_config(),
module_levels=>[{module(),level() | all | none}]}.
get_config() ->
#{primary=>get_primary_config(),
handlers=>get_handler_config(),
+ proxy=>get_proxy_config(),
module_levels=>lists:keysort(1,get_module_level())}.
-spec internal_init_logger() -> ok | {error,term()}.
diff --git a/lib/kernel/src/logger_olp.erl b/lib/kernel/src/logger_olp.erl
index 013cc6ce37..fbc2e81882 100644
--- a/lib/kernel/src/logger_olp.erl
+++ b/lib/kernel/src/logger_olp.erl
@@ -47,16 +47,7 @@
-opaque olp_ref() :: {atom(),pid(),ets:tid()}.
--type options() :: #{sync_mode_qlen => integer(),
- drop_mode_qlen => integer(),
- flush_qlen => integer(),
- burst_limit_enable => boolean(),
- burst_limit_max_count => integer(),
- burst_limit_window_time => integer(),
- overload_kill_enable => boolean(),
- overload_kill_qlen => integer(),
- overload_kill_mem_size => integer(),
- overload_kill_restart_after => integer()}.
+-type options() :: logger:olp_config().
%%%-----------------------------------------------------------------
%%% API
diff --git a/lib/kernel/src/logger_proxy.erl b/lib/kernel/src/logger_proxy.erl
index f89891bff0..45a3011828 100644
--- a/lib/kernel/src/logger_proxy.erl
+++ b/lib/kernel/src/logger_proxy.erl
@@ -20,7 +20,7 @@
-module(logger_proxy).
%% API
--export([start_link/0, restart/0, log/2, child_spec/0]).
+-export([start_link/0, restart/0, log/2, child_spec/0, get_default_config/0]).
%% logger_olp callbacks
-export([init/1, handle_load/2, handle_info/2, terminate/2,
@@ -69,11 +69,7 @@ start_link() ->
%%
%% Burst limit is disabled, since this is only a proxy and we
%% don't want to limit bursts twice (here and in the handler).
- Opts = #{sync_mode_qlen=>500,
- drop_mode_qlen=>1000,
- flush_qlen=>5000,
- burst_limit_enable=>false},
- logger_olp:start_link(?SERVER,?MODULE,[],Opts).
+ logger_olp:start_link(?SERVER,?MODULE,[],get_default_config()).
%% Fun used for restarting this process after it has been killed due
%% to overload (must set overload_kill_enable=>true in opts)
@@ -97,6 +93,13 @@ child_spec() ->
type => worker,
modules => [?MODULE]}.
+get_default_config() ->
+ OlpDefault = logger_olp:get_default_opts(),
+ OlpDefault#{sync_mode_qlen=>500,
+ drop_mode_qlen=>1000,
+ flush_qlen=>5000,
+ burst_limit_enable=>false}.
+
%%%===================================================================
%%% gen_server callbacks
%%%===================================================================
diff --git a/lib/kernel/test/logger_proxy_SUITE.erl b/lib/kernel/test/logger_proxy_SUITE.erl
index 3197cf35de..2a76eec0fd 100644
--- a/lib/kernel/test/logger_proxy_SUITE.erl
+++ b/lib/kernel/test/logger_proxy_SUITE.erl
@@ -128,7 +128,48 @@ remote_emulator(cleanup,_Config) ->
ok = logger:remove_handler(?HNAME).
config(_Config) ->
- {skip,not_yet_implemented}.
+ C1 = #{sync_mode_qlen:=SQ,
+ drop_mode_qlen:=DQ} = logger:get_proxy_config(),
+
+ %% Update the existing config with these two values
+ SQ1 = SQ+1,
+ DQ1 = DQ+1,
+ ok = logger:update_proxy_config(#{sync_mode_qlen=>SQ1,
+ drop_mode_qlen=>DQ1}),
+ C2 = logger:get_proxy_config(),
+ C2 = C1#{sync_mode_qlen:=SQ1,
+ drop_mode_qlen:=DQ1},
+
+ %% Update the existing again with only one value
+ SQ2 = SQ+2,
+ ok = logger:update_proxy_config(#{sync_mode_qlen=>SQ2}),
+ C3 = logger:get_proxy_config(),
+ C3 = C2#{sync_mode_qlen:=SQ2},
+
+ %% Set the config, i.e. merge with defaults
+ ok = logger:set_proxy_config(#{sync_mode_qlen=>SQ1}),
+ C4 = logger:get_proxy_config(),
+ C4 = C1#{sync_mode_qlen:=SQ1},
+
+ %% Reset to default
+ ok = logger:set_proxy_config(#{}),
+ C5 = logger:get_proxy_config(),
+ C5 = logger_proxy:get_default_config(),
+
+ %% Errors
+ {error,{invalid_olp_config,_}} =
+ logger:set_proxy_config(#{faulty_key=>1}),
+ {error,{invalid_olp_config,_}} =
+ logger:set_proxy_config(#{sync_mode_qlen=>infinity}),
+ {error,{invalid_config,[]}} = logger:set_proxy_config([]),
+
+ {error,{invalid_olp_config,_}} =
+ logger:update_proxy_config(#{faulty_key=>1}),
+ {error,{invalid_olp_config,_}} =
+ logger:update_proxy_config(#{sync_mode_qlen=>infinity}),
+ {error,{invalid_config,[]}} = logger:update_proxy_config([]),
+
+ ok.
config(cleanup,_Config) ->
ok.