[bug#62490] [PATCH] services: nginx: Make logging level configurable.

[Bruno Victal]

* gnu/services/web.scm (<nginx-configuration>)[log-level]: New field.
(assert-valid-log-level): New procedure.
(default-nginx-config): Make log-level configurable.
* doc/guix.texi (Web Services): Document it.
---

Note: Hardcoding this value to 'info is extremely bad for
flash endurance, and results in very large logs.

 doc/guix.texi        |  5 +++++
 gnu/services/web.scm | 24 +++++++++++++++++++++++-
 2 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/doc/guix.texi b/doc/guix.texi
index c49e51b72e..8df3c285ad 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -29838,6 +29838,11 @@ Web Services
 @item @code{log-directory} (default: @code{"/var/log/nginx"})
 The directory to which NGinx will write log files.
 
+@item @code{log-level} (default: @code{'error}) (type: symbol)
+Logging level, which can be any of the following values: @code{'debug},
+@code{'info}, @code{'notice}, @code{'warn}, @code{'error}, @code{'crit},
+@code{'alert}, or @code{'emerg}.
+
 @item @code{run-directory} (default: @code{"/var/run/nginx"})
 The directory in which NGinx will create a pid file, and write temporary
 files.
diff --git a/gnu/services/web.scm b/gnu/services/web.scm
index d56e893527..aef694e145 100644
--- a/gnu/services/web.scm
+++ b/gnu/services/web.scm
@@ -51,6 +51,9 @@ (define-module (gnu services web)
   #:use-module (gnu packages logging)
   #:use-module (gnu packages mail)
   #:use-module (gnu packages rust-apps)
+  #:autoload   (guix i18n) (G_)
+  #:use-module (guix combinators)
+  #:use-module (guix diagnostics)
   #:use-module (guix packages)
   #:use-module (guix records)
   #:use-module (guix modules)
@@ -61,6 +64,8 @@ (define-module (gnu services web)
   #:use-module ((guix packages) #:select (package-version))
   #:use-module (srfi srfi-1)
   #:use-module (srfi srfi-9)
+  #:use-module (srfi srfi-34)
+  #:use-module (srfi srfi-35)
   #:use-module (ice-9 match)
   #:use-module (ice-9 format)
   #:export (httpd-configuration
@@ -96,6 +101,7 @@ (define-module (gnu services web)
             nginx-configuration-nginx
             nginx-configuration-shepherd-requirement
             nginx-configuration-log-directory
+            nginx-configuration-log-level
             nginx-configuration-run-directory
             nginx-configuration-server-blocks
             nginx-configuration-upstream-blocks
@@ -562,6 +568,9 @@ (define-record-type* <nginx-configuration>
                         (default '()))              ;list of symbols
   (log-directory nginx-configuration-log-directory  ;string
                  (default "/var/log/nginx"))
+  (log-level     nginx-configuration-log-level
+                 (sanitize assert-valid-log-level)
+                 (default 'error))
   (run-directory nginx-configuration-run-directory  ;string
                  (default "/var/run/nginx"))
   (server-blocks nginx-configuration-server-blocks
@@ -584,6 +593,18 @@ (define-record-type* <nginx-configuration>
   (file          nginx-configuration-file         ;#f | string | file-like
                  (default #f)))
 
+(define-compile-time-procedure (assert-valid-log-level (level symbol?))
+  "Ensure @var{level} is one of @code{'debug}, @code{'info}, @code{'notice},
+@code{'warn}, @code{'error}, @code{'crit}, @code{'alert}, or @code{'emerg}."
+  (unless (memq level '(debug info notice warn error crit alert emerg))
+    (raise
+     (make-compound-condition
+      (formatted-message (G_ "unknown log level '~a'") level)
+      (condition (&error-location
+                  (location
+                   (source-properties->location procedure-call-location)))))))
+  level)
+
 (define (config-domain-strings names)
  "Return a string denoting the nginx config representation of NAMES, a list
 of domain names."
@@ -692,6 +713,7 @@ (define (default-nginx-config config)
   (match-record config
                 <nginx-configuration>
                 (nginx log-directory run-directory
+                 log-level
                  server-blocks upstream-blocks
                  server-names-hash-bucket-size
                  server-names-hash-bucket-max-size
@@ -704,7 +726,7 @@ (define (default-nginx-config config)
           (flatten
            "user nginx nginx;\n"
            "pid " run-directory "/pid;\n"
-           "error_log " log-directory "/error.log info;\n"
+           "error_log " log-directory "/error.log " (symbol->string log-level) 
";\n"
            (map emit-load-module modules)
            (map emit-global-directive global-directives)
            "http {\n"
-- 
2.39.1