Allow to override log level for specific target

.env.template

@@ -370,6 +370,13 @@
 ## routes and static file, websocket and alive requests
 # LOG_LEVEL=info
 
+## log level target override
+## Change the verbosity of specific log output
+## Format is a line for each "target=log_level"
+#LOG_LEVEL_OVERRIDE="
+#routes=warn
+#"
+
 ## Token for the admin interface, preferably an Argon2 PCH string
 ## Vaultwarden has a built-in generator by calling `vaultwarden hash`
 ## For details see: https://github.com/dani-garcia/vaultwarden/wiki/Enabling-admin-page#secure-the-admin_token

src/config.rs

@@ -1,8 +1,10 @@
 use std::env::consts::EXE_SUFFIX;
 use std::process::exit;
+use std::str::FromStr;
 use std::sync::RwLock;
 
 use job_scheduler_ng::Schedule;
+use log::LevelFilter;
 use once_cell::sync::Lazy;
 use reqwest::Url;
 
@@ -571,6 +573,8 @@ make_config! {
         log_file:               String, false,  option;
         /// Log level
         log_level:              String, false,  def,    "Info".to_string();
+        /// Override individual log level
+        log_level_override:     String, false,  def,    String::new();
 
         /// Enable DB WAL |> Turning this off might lead to worse performance, but might help if using vaultwarden on some exotic filesystems,
         /// that do not support WAL. Please make sure you read project wiki on the topic before changing this setting.
@@ -1343,6 +1347,25 @@ impl Config {
     pub fn sso_scopes_vec(&self) -> Vec<String> {
         self.sso_scopes().split_whitespace().map(str::to_string).collect()
     }
+
+    pub fn log_overrides(&self) -> Vec<(String, LevelFilter)> {
+        self.log_level_override()
+            .lines()
+            .map(|l| l.trim())
+            .filter(|l| !l.is_empty() && !l.starts_with("//"))
+            .filter_map(|l| {
+                let split = l.split('=').collect::<Vec<&str>>();
+                let log = match &split[..] {
+                    [path, level] => LevelFilter::from_str(level).ok().map(|l| ((*path).to_string(), l)),
+                    _ => None,
+                };
+                if log.is_none() {
+                    println!("[WARNING] Failed to parse ({l}) as a log override. Expected xxx=log_level");
+                }
+                log
+            })
+            .collect()
+    }
 }
 
 use handlebars::{

src/main.rs

@@ -314,6 +314,10 @@ fn init_logging(level: log::LevelFilter) -> Result<(), fern::InitError> {
         logger = logger.level_for("lettre::transport::smtp", log::LevelFilter::Off)
     }
 
+    for (path, level) in CONFIG.log_overrides() {
+        logger = logger.level_for(path, level);
+    }
+
     if CONFIG.extended_logging() {
         logger = logger.format(|out, message, record| {
             out.finish(format_args!(