Include control mempool config option

Create a new config parameter to limit the amount of transactions
that can be kept in the control mempool

lib/src/config/config.rs

@@ -696,11 +696,13 @@ impl ClientConfigBuilder {
     pub fn mempool(
         &mut self,
         size_limit: usize,
+        control_size_limit: usize,
         filter_rules: MempoolRules,
         filter_limit: usize,
     ) -> &mut Self {
         self.mempool = Some(MempoolConfig {
             size_limit,
+            control_size_limit,
             filter_rules,
             filter_limit,
         });

lib/src/config/config_file/mod.rs

@@ -382,6 +382,7 @@ pub struct DatabaseSettings {
 pub struct MempoolSettings {
     pub filter: Option<MempoolFilterSettings>,
     pub size_limit: Option<usize>,
+    pub control_size_limit: Option<usize>,
     pub blacklist_limit: Option<usize>,
 }
 
@@ -427,6 +428,9 @@ impl From<MempoolSettings> for MempoolConfig {
     fn from(mempool: MempoolSettings) -> Self {
         Self {
             size_limit: mempool.size_limit.unwrap_or(Mempool::DEFAULT_SIZE_LIMIT),
+            control_size_limit: mempool
+                .control_size_limit
+                .unwrap_or(Mempool::DEFAULT_CONTROL_SIZE_LIMIT),
             filter_limit: mempool
                 .blacklist_limit
                 .unwrap_or(MempoolFilter::DEFAULT_BLACKLIST_SIZE),

mempool/src/config.rs

@@ -4,8 +4,10 @@ use crate::mempool::Mempool;
 /// Struct defining a Mempool configuration
 #[derive(Debug, Clone)]
 pub struct MempoolConfig {
-    /// Total size limit of transactions in the mempool (bytes)
+    /// Total size limit of transactions in the regular mempool (bytes)
     pub size_limit: usize,
+    /// Total size limit of transactions in the control mempool (bytes)
+    pub control_size_limit: usize,
     /// Mempool filter rules
     pub filter_rules: MempoolRules,
     /// Mempool filter limit or size
@@ -16,6 +18,7 @@ impl Default for MempoolConfig {
     fn default() -> MempoolConfig {
         MempoolConfig {
             size_limit: Mempool::DEFAULT_SIZE_LIMIT,
+            control_size_limit: Mempool::DEFAULT_CONTROL_SIZE_LIMIT,
             filter_rules: MempoolRules::default(),
             filter_limit: MempoolFilter::DEFAULT_BLACKLIST_SIZE,
         }

mempool/src/mempool.rs

@@ -73,7 +73,10 @@ pub struct Mempool {
 
 impl Mempool {
     /// Default total size limit of transactions in the mempool (bytes)
-    pub const DEFAULT_SIZE_LIMIT: usize = 12000000;
+    pub const DEFAULT_SIZE_LIMIT: usize = 12_000_000;
+
+    /// Default total size limit of control transactions in the mempool (bytes)
+    pub const DEFAULT_CONTROL_SIZE_LIMIT: usize = 6_000_000;
 
     /// Creates a new mempool
     pub fn new(blockchain: Arc<RwLock<Blockchain>>, config: MempoolConfig) -> Self {