[Tarantool-patches] [PATCH v3 0/3] log: allow json formatter in boottime logger

[Tarantool-patches] [PATCH v3 0/3] log: allow json formatter in boottime logger

[Cyrill Gorcunov]

For some reason we've disabled usage of json formatter in early
logging since the commit 098324556. Lets allow it back.

v2:
 - add early verification of options for cases like
   box.cfg{log="syslog:", log_format="json"}
 - extend test

v3:
 - pass the whole cfg table into verify_option helper
 - use string.startswith helper in verify_format

branch gorcunov/gh-5121-logger-boot-json-3
issue https://github.com/tarantool/tarantool/issues/5121

Cyrill Gorcunov (3):
  core/say: allow to use json in boot logger
  lua/log: allow to use json formatter early
  test: app-tap/logger -- test json in boottime logger

 src/box/lua/load_cfg.lua     |  6 +++---
 src/lib/core/say.c           |  7 ++----
 src/lua/log.lua              | 42 +++++++++++++++++++++++++++---------
 test/app-tap/logger.test.lua | 19 ++++++++++++----
 4 files changed, 52 insertions(+), 22 deletions(-)

-- 
2.26.2

[Tarantool-patches] [PATCH v3 1/3] core/say: allow to use json in boot logger

[Cyrill Gorcunov]

For some reason in commit 098324556 we've disabled
to use json format in boot time logger. There is
no reason to do so.

Only syslog output format is predefined and must not
be changed, in turn json format is just a decoration
over output stream so we can use it whenever requested.

Part-of #5121

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
---
 src/lib/core/say.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/src/lib/core/say.c b/src/lib/core/say.c
index 791011e6f..b903cb03f 100644
--- a/src/lib/core/say.c
+++ b/src/lib/core/say.c
@@ -206,17 +206,14 @@ say_set_log_format(enum say_format format)
 {
 	log_format_func_t format_func;
 	/*
-	 * When logger type is SAY_LOGGER_BOOT it simply prints
-	 * every message to stdout intact and can't be formatted.
 	 * SAY_LOGGER_SYSLOG type uses the well-documented and
 	 * *recommended* format described in the RFC below:
 	 * https://tools.ietf.org/html/rfc3164#section-4.1
 	 * Thereby format can't be changed for this type either.
 	 */
-	bool unchangeable = log_default->type == SAY_LOGGER_BOOT ||
-			    log_default->type == SAY_LOGGER_SYSLOG;
-	if (unchangeable)
+	if (log_default->type == SAY_LOGGER_SYSLOG)
 		return;
+
 	switch (format) {
 	case SF_JSON:
 		format_func = say_format_json;
-- 
2.26.2

[Tarantool-patches] [PATCH v3 2/3] lua/log: allow to use json formatter early

[Cyrill Gorcunov]

There is no reason to not allow for json formatter
on early logging stage.

We add verification that

	box.cfg{log="syslog:", log_format="json"}
or
	require('log').cfg{log="syslog:", format="json"}

is triggering error since syslog output requires
predefined structure and can't use json.

Fixes #5121

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
---
 src/box/lua/load_cfg.lua |  6 +++---
 src/lua/log.lua          | 42 ++++++++++++++++++++++++++++++----------
 2 files changed, 35 insertions(+), 13 deletions(-)

diff --git a/src/box/lua/load_cfg.lua b/src/box/lua/load_cfg.lua
index f2f2df6f8..549c14cf3 100644
--- a/src/box/lua/load_cfg.lua
+++ b/src/box/lua/load_cfg.lua
@@ -459,13 +459,13 @@ local function prepare_cfg(cfg, default_cfg, template_cfg,
                             module_cfg[k], modify_cfg[k], readable_name)
         elseif template_cfg[k] == 'module' then
             local old_value = module_cfg[k].cfg_get(k, v)
-            module_cfg_backup[k] = old_value
+            module_cfg_backup[k] = old_value or box.NULL
 
-            local ok, msg = module_cfg[k].cfg_set(k, v)
+            local ok, msg = module_cfg[k].cfg_set(cfg, k, v)
             if not ok then
                 -- restore back the old values for modules
                 for module_k, module_v in pairs(module_cfg_backup) do
-                    module_cfg[module_k].cfg_set(module_k, module_v)
+                    module_cfg[module_k].cfg_set(nil, module_k, module_v)
                 end
                 box.error(box.error.CFG, readable_name, msg)
             end
diff --git a/src/lua/log.lua b/src/lua/log.lua
index bed690526..0d427a0b7 100644
--- a/src/lua/log.lua
+++ b/src/lua/log.lua
@@ -194,7 +194,7 @@ local function verify_static(k, v)
 end
 
 -- Test if format is valid.
-local function verify_format(key, name)
+local function verify_format(key, name, cfg)
     assert(log_cfg[key] ~= nil)
 
     if not fmt_str2num[name] then
@@ -202,11 +202,25 @@ local function verify_format(key, name)
         return false, m:format(fmt_list())
     end
 
+    local log_type = ffi.C.log_type()
+
+    -- When comes from log.cfg{} or box.cfg{}
+    -- initial call we might be asked to setup
+    -- syslog with json which is not allowed.
+    --
+    -- Note the cfg table comes from two places:
+    -- box api interface and log module itself.
+    -- The good thing that we're only needed log
+    -- entry which is the same key for both.
+    if cfg ~= nil and cfg['log'] ~= nil then
+        if string.startswith(cfg['log'], "syslog:") then
+            log_type = ffi.C.SAY_LOGGER_SYSLOG
+        end
+    end
+
     if fmt_str2num[name] == ffi.C.SF_JSON then
-        if ffi.C.log_type() == ffi.C.SAY_LOGGER_SYSLOG or
-            ffi.C.log_type() == ffi.C.SAY_LOGGER_BOOT then
-            local m = "%s can't be used with " ..
-            "syslog or boot-time logger"
+        if log_type == ffi.C.SAY_LOGGER_SYSLOG then
+            local m = "%s can't be used with syslog logger"
             return false, m:format(fmt_num2str[ffi.C.SF_JSON])
         end
     end
@@ -239,11 +253,11 @@ local verify_ops = {
 }
 
 -- Verify a value for the particular key.
-local function verify_option(k, v)
+local function verify_option(k, v, ...)
     assert(k ~= nil)
 
     if verify_ops[k] ~= nil then
-        return verify_ops[k](k, v)
+        return verify_ops[k](k, v, ...)
     end
 
     return true
@@ -372,10 +386,18 @@ local function box_api_cfg_get(key)
 end
 
 -- Set value to log from box.cfg{}.
-local function box_api_cfg_set(key, value)
+local function box_api_cfg_set(cfg, key, value)
     local log_key = box2log_keys[key]
+    local aux_data
+
+    -- a special case where we need to restore
+    -- nil value from previous setup attempt.
+    if value == box.NULL then
+        log_cfg[log_key] = nil
+        return true
+    end
 
-    local ok, msg = verify_option(log_key, value)
+    local ok, msg = verify_option(log_key, value, cfg)
     if not ok then
         return false, msg
     end
@@ -450,7 +472,7 @@ local function load_cfg(oldcfg, cfg)
     end
 
     if cfg.format ~= nil then
-        local ok, msg = verify_option('format', cfg.format)
+        local ok, msg = verify_option('format', cfg.format, cfg)
         if not ok then
             local m = "log.cfg: \'%s\' %s"
             error(m:format('format', msg))
-- 
2.26.2

[Tarantool-patches] [PATCH v3 3/3] test: app-tap/logger -- test json in boottime logger

[Cyrill Gorcunov]

Make sure we're allowed to setup json formatter before
box.cfg() call, ie that named boot-time logger.

Part-of #5121

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
---
 test/app-tap/logger.test.lua | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/test/app-tap/logger.test.lua b/test/app-tap/logger.test.lua
index ae4a3b99a..a448ba87a 100755
--- a/test/app-tap/logger.test.lua
+++ b/test/app-tap/logger.test.lua
@@ -1,13 +1,24 @@
 #!/usr/bin/env tarantool
 
 local test = require('tap').test('log')
-test:plan(62)
+test:plan(64)
 
--- gh-3946: Assertion failure when using log_format() before box.cfg()
+--
+-- gh-5121: Allow to use 'json' output before box.cfg()
+--
 local log = require('log')
-log.log_format('plain')
 _, err = pcall(log.log_format, 'json')
-test:ok(err:find("json can\'t be used") ~= nil)
+test:ok(err == nil)
+
+-- We're not allowed to use json with syslog though.
+_, err = pcall(log.cfg, {log='syslog:', format='json'})
+test:ok(tostring(err):find("can\'t be used with syslog logger") ~= nil)
+
+_, err = pcall(box.cfg, {log='syslog:', log_format='json'})
+test:ok(tostring(err):find("can\'t be used with syslog logger") ~= nil)
+
+-- switch back to plain to next tests
+log.log_format('plain')
 
 --
 -- gh-689: various settings change from box.cfg/log.cfg interfaces
-- 
2.26.2

Re: [Tarantool-patches] [PATCH v3 2/3] lua/log: allow to use json formatter early

[Oleg Babin]

Hi! Thanks for your patch! LGTM! See one minor nitpick below. I hope you 
could just force-pushed proposed change.

On 02/07/2020 12:50, Cyrill Gorcunov wrote:
>   -- Set value to log from box.cfg{}.
> -local function box_api_cfg_set(key, value)
> +local function box_api_cfg_set(cfg, key, value)
>       local log_key = box2log_keys[key]
> +    local aux_data

Seems this variable is unused and could be dropped.

Re: [Tarantool-patches] [PATCH v3 0/3] log: allow json formatter in boottime logger

[Oleg Babin]

Hi! LGTM for whole patchset except one note that I've sent separately 
for the second patch.

On 02/07/2020 12:50, Cyrill Gorcunov wrote:
> For some reason we've disabled usage of json formatter in early
> logging since the commit 098324556. Lets allow it back.
>
> v2:
>   - add early verification of options for cases like
>     box.cfg{log="syslog:", log_format="json"}
>   - extend test
>
> v3:
>   - pass the whole cfg table into verify_option helper
>   - use string.startswith helper in verify_format
>
> branch gorcunov/gh-5121-logger-boot-json-3
> issue https://github.com/tarantool/tarantool/issues/5121
>
> Cyrill Gorcunov (3):
>    core/say: allow to use json in boot logger
>    lua/log: allow to use json formatter early
>    test: app-tap/logger -- test json in boottime logger
>
>   src/box/lua/load_cfg.lua     |  6 +++---
>   src/lib/core/say.c           |  7 ++----
>   src/lua/log.lua              | 42 +++++++++++++++++++++++++++---------
>   test/app-tap/logger.test.lua | 19 ++++++++++++----
>   4 files changed, 52 insertions(+), 22 deletions(-)
>

Re: [Tarantool-patches] [PATCH v3 2/3] lua/log: allow to use json formatter early

[Cyrill Gorcunov]

On Thu, Jul 02, 2020 at 01:05:38PM +0300, Oleg Babin wrote:
> Hi! Thanks for your patch! LGTM! See one minor nitpick below. I hope you
> could just force-pushed proposed change.
> 
> On 02/07/2020 12:50, Cyrill Gorcunov wrote:
> >   -- Set value to log from box.cfg{}.
> > -local function box_api_cfg_set(key, value)
> > +local function box_api_cfg_set(cfg, key, value)
> >       local log_key = box2log_keys[key]
> > +    local aux_data
> 
> Seems this variable is unused and could be dropped.

Yeah, thanks! Already changed and force pushed.

Re: [Tarantool-patches] [PATCH v3 2/3] lua/log: allow to use json formatter early

[Oleg Babin]

Thanks! LGTM.

On 02/07/2020 13:18, Cyrill Gorcunov wrote:
> On Thu, Jul 02, 2020 at 01:05:38PM +0300, Oleg Babin wrote:
>> Hi! Thanks for your patch! LGTM! See one minor nitpick below. I hope you
>> could just force-pushed proposed change.
>>
>> On 02/07/2020 12:50, Cyrill Gorcunov wrote:
>>>    -- Set value to log from box.cfg{}.
>>> -local function box_api_cfg_set(key, value)
>>> +local function box_api_cfg_set(cfg, key, value)
>>>        local log_key = box2log_keys[key]
>>> +    local aux_data
>> Seems this variable is unused and could be dropped.
> Yeah, thanks! Already changed and force pushed.

Re: [Tarantool-patches] [PATCH v3 0/3] log: allow json formatter in boottime logger

[Yaroslav Dynnikov]

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Hi!

Thank you for the patchset, and thank Oleg for the detailed review!
Whole patch set LGTM.

Best regards
Yaroslav Dynnikov


On Thu, 2 Jul 2020 at 12:50, Cyrill Gorcunov <gorcunov@gmail.com> wrote:

> For some reason we've disabled usage of json formatter in early
> logging since the commit 098324556. Lets allow it back.
>
> v2:
>  - add early verification of options for cases like
>    box.cfg{log="syslog:", log_format="json"}
>  - extend test
>
> v3:
>  - pass the whole cfg table into verify_option helper
>  - use string.startswith helper in verify_format
>
> branch gorcunov/gh-5121-logger-boot-json-3
> issue https://github.com/tarantool/tarantool/issues/5121
>
> Cyrill Gorcunov (3):
>   core/say: allow to use json in boot logger
>   lua/log: allow to use json formatter early
>   test: app-tap/logger -- test json in boottime logger
>
>  src/box/lua/load_cfg.lua     |  6 +++---
>  src/lib/core/say.c           |  7 ++----
>  src/lua/log.lua              | 42 +++++++++++++++++++++++++++---------
>  test/app-tap/logger.test.lua | 19 ++++++++++++----
>  4 files changed, 52 insertions(+), 22 deletions(-)
>
> --
> 2.26.2
>
>

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