More flexible PHP FPM pool config

src/templates/php.rs

@@ -1,9 +1,40 @@
+use std::fmt::{Display, Error, Formatter};
 use std::path::Path;
 
+#[derive(Clone, Debug, PartialEq, Hash, Eq)]
+pub struct FpmPoolConfig {
+  max_children: usize,
+  custom: Option<String>,
+}
+
+impl Display for FpmPoolConfig {
+  fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> {
+    match &self.custom {
+      None => write!(f, "pm.max_children = {}", self.max_children),
+      Some(custom) => write!(f, "pm.max_children = {}\n{}", self.max_children, custom),
+    }
+  }
+}
+
+impl From<usize> for FpmPoolConfig {
+  fn from(max_children: usize) -> Self {
+    Self {
+      max_children,
+      custom: None,
+    }
+  }
+}
+
+impl FpmPoolConfig {
+  pub fn new(max_children: usize, custom: impl Into<String>) -> Self {
+    Self { max_children, custom: Some(custom.into()) }
+  }
+}
+
 pub fn fpm_pool_config<U: AsRef<str>, S: AsRef<Path>>(
   user_name: U,
   socket_path: S,
-  max_children: usize,
+  config: &FpmPoolConfig,
 ) -> String {
   format!(
     "[{0}]
@@ -13,12 +44,12 @@ group = www-data
 listen = {1}
 listen.owner = www-data
 pm = ondemand
-pm.max_children = {2}
 catch_workers_output = yes
 env[PATH] = /usr/local/bin:/usr/bin:/bin
+{2}
 ",
     user_name.as_ref(),
     socket_path.as_ref().to_str().unwrap(),
-    max_children,
+    config
   )
 }