Remove base-pattern for Monitor (#2953)

* Remove base-pattern for Monitor

* Fix runtime parameter for log_record

---------

Co-authored-by: Dongjia "toka" Zhang <tokazerkje@outlook.com>

MIGRATION.md

@@ -10,6 +10,7 @@
   - There is a `ClientStatsManager` to manage client statistics, and is owned by `EventManager`. Most of previous `Monitor`'s trait methods have been moved to the `ClientStatsManager`.
   - `user_monitor` has been renamed to `user_stats`, and its structure definitions have been moved to `statistics` module as well.
   - `introspection_monitor` has been renamed to `introspection_stats`, and perf-related structure definitions have been renamed and moved to `statistics` module as well.
+  - `OnDiskTomlMonitor`, `OnDiskJsonMonitor`, `OnDiskJsonAggregateMonitor` are now no longer takes a base monitor to wrap. If you want to use multiple monitors together, use `libafl::combine_monitor!`.
 
 # 0.14.1 -> 0.15.0
 - `MmapShMem::new` and `MmapShMemProvider::new_shmem_with_id` now take `AsRef<Path>` instead of a byte array for the filename/id.

fuzzers/inprocess/libfuzzer_libpng_launcher/src/lib.rs

@@ -7,6 +7,7 @@ use std::{env, net::SocketAddr, path::PathBuf};
 
 use clap::{self, Parser};
 use libafl::{
+    combine_monitor,
     corpus::{Corpus, InMemoryCorpus, OnDiskCorpus},
     events::{launcher::Launcher, EventConfig},
     executors::{inprocess::InProcessExecutor, ExitKind},
@@ -140,9 +141,9 @@ pub extern "C" fn libafl_main() {
 
     let shmem_provider = StdShMemProvider::new().expect("Failed to init shared memory");
 
-    let monitor = OnDiskTomlMonitor::new(
+    let monitor = combine_monitor!(
-        "./fuzzer_stats.toml",
+        OnDiskTomlMonitor::new("./fuzzer_stats.toml"),
-        MultiMonitor::new(|s| println!("{s}")),
+        MultiMonitor::new(|s| println!("{s}"))
     );
 
     let mut run_client = |state: Option<_>, mut restarting_mgr, _client_description| {

fuzzers/inprocess/libfuzzer_libpng_norestart/src/lib.rs

@@ -8,6 +8,7 @@ use std::{env, net::SocketAddr, path::PathBuf};
 
 use clap::Parser;
 use libafl::{
+    combine_monitor,
     corpus::{Corpus, InMemoryOnDiskCorpus, OnDiskCorpus},
     events::{
         launcher::{ClientDescription, Launcher},
@@ -156,9 +157,9 @@ pub extern "C" fn libafl_main() {
 
     let shmem_provider = MmapShMemProvider::new().expect("Failed to init shared memory");
 
-    let monitor = OnDiskTomlMonitor::new(
+    let monitor = combine_monitor!(
-        "./fuzzer_stats.toml",
+        OnDiskTomlMonitor::new("./fuzzer_stats.toml"),
-        MultiMonitor::new(|s| println!("{s}")),
+        MultiMonitor::new(|s| println!("{s}"))
     );
 
     let mut run_client = |state: Option<_>,

libafl/src/monitors/disk.rs

@@ -1,4 +1,4 @@
-//! Monitors that wrap a base monitor and also log to disk using different formats like `JSON` and `TOML`.
+//! Monitors that log to disk using different formats like `JSON` and `TOML`.
 
 use alloc::string::String;
 use core::time::Duration;
@@ -11,32 +11,22 @@ use std::{
 use libafl_bolts::{current_time, format_duration_hms, ClientId};
 use serde_json::json;
 
-use crate::{
+use crate::{monitors::Monitor, statistics::manager::ClientStatsManager};
-    monitors::{Monitor, NopMonitor},
-    statistics::manager::ClientStatsManager,
-};
 
 /// Wrap a monitor and log the current state of the monitor into a Toml file.
 #[derive(Debug, Clone)]
-pub struct OnDiskTomlMonitor<M>
+pub struct OnDiskTomlMonitor {
-where
-    M: Monitor,
-{
-    base: M,
     filename: PathBuf,
     last_update: Duration,
     update_interval: Duration,
 }
 
-impl<M> Monitor for OnDiskTomlMonitor<M>
+impl Monitor for OnDiskTomlMonitor {
-where
-    M: Monitor,
-{
     fn display(
         &mut self,
         client_stats_manager: &mut ClientStatsManager,
-        event_msg: &str,
+        _event_msg: &str,
-        sender_id: ClientId,
+        _sender_id: ClientId,
     ) {
         let cur_time = current_time();
 
@@ -100,33 +90,26 @@ exec_sec = {}
 
             drop(file);
         }
-
-        self.base
-            .display(client_stats_manager, event_msg, sender_id);
     }
 }
 
-impl<M> OnDiskTomlMonitor<M>
+impl OnDiskTomlMonitor {
-where
-    M: Monitor,
-{
     /// Create new [`OnDiskTomlMonitor`]
     #[must_use]
-    pub fn new<P>(filename: P, base: M) -> Self
+    pub fn new<P>(filename: P) -> Self
     where
         P: Into<PathBuf>,
     {
-        Self::with_update_interval(filename, base, Duration::from_secs(60))
+        Self::with_update_interval(filename, Duration::from_secs(60))
     }
 
     /// Create new [`OnDiskTomlMonitor`] with custom update interval
     #[must_use]
-    pub fn with_update_interval<P>(filename: P, base: M, update_interval: Duration) -> Self
+    pub fn with_update_interval<P>(filename: P, update_interval: Duration) -> Self
     where
         P: Into<PathBuf>,
     {
         Self {
-            base,
             filename: filename.into(),
             last_update: current_time() - update_interval,
             update_interval,
@@ -134,62 +117,55 @@ where
     }
 }
 
-impl OnDiskTomlMonitor<NopMonitor> {
+impl OnDiskTomlMonitor {
     /// Create new [`OnDiskTomlMonitor`] without a base
     #[must_use]
+    #[deprecated(since = "0.16.0", note = "Use new directly")]
     pub fn nop<P>(filename: P) -> Self
     where
         P: Into<PathBuf>,
     {
-        Self::new(filename, NopMonitor::new())
+        Self::new(filename)
     }
 }
 
 #[derive(Debug, Clone)]
-/// Wraps a base monitor and continuously appends the current statistics to a Json lines file.
+/// Continuously appends the current statistics to a Json lines file.
-pub struct OnDiskJsonMonitor<F, M>
+pub struct OnDiskJsonMonitor<F>
 where
-    F: FnMut(&mut M) -> bool,
+    F: FnMut(&mut ClientStatsManager) -> bool,
-    M: Monitor,
 {
-    base: M,
     path: PathBuf,
     /// A function that has the current runtime as argument and decides, whether a record should be logged
     log_record: F,
 }
 
-impl<F, M> OnDiskJsonMonitor<F, M>
+impl<F> OnDiskJsonMonitor<F>
 where
-    F: FnMut(&mut M) -> bool,
+    F: FnMut(&mut ClientStatsManager) -> bool,
-    M: Monitor,
 {
     /// Create a new [`OnDiskJsonMonitor`]
-    pub fn new<P>(filename: P, base: M, log_record: F) -> Self
+    pub fn new<P>(filename: P, log_record: F) -> Self
     where
         P: Into<PathBuf>,
     {
         let path = filename.into();
 
-        Self {
+        Self { path, log_record }
-            base,
-            path,
-            log_record,
-        }
     }
 }
 
-impl<F, M> Monitor for OnDiskJsonMonitor<F, M>
+impl<F> Monitor for OnDiskJsonMonitor<F>
 where
-    F: FnMut(&mut M) -> bool,
+    F: FnMut(&mut ClientStatsManager) -> bool,
-    M: Monitor,
 {
     fn display(
         &mut self,
         client_stats_manager: &mut ClientStatsManager,
-        event_msg: &str,
+        _event_msg: &str,
-        sender_id: ClientId,
+        _sender_id: ClientId,
     ) {
-        if (self.log_record)(&mut self.base) {
+        if (self.log_record)(client_stats_manager) {
             let file = OpenOptions::new()
                 .append(true)
                 .create(true)
@@ -207,7 +183,5 @@ where
             });
             writeln!(&file, "{line}").expect("Unable to write Json to file");
         }
-        self.base
-            .display(client_stats_manager, event_msg, sender_id);
     }
 }

libafl/src/monitors/disk_aggregate.rs

@@ -11,22 +11,17 @@ use serde_json::json;
 
 use crate::{monitors::Monitor, statistics::manager::ClientStatsManager};
 
-/// A monitor that wraps another monitor and logs aggregated stats to a JSON file.
+/// A monitor that logs aggregated stats to a JSON file.
 #[derive(Clone)]
-pub struct OnDiskJsonAggregateMonitor<M> {
+pub struct OnDiskJsonAggregateMonitor {
-    base: M,
     json_path: PathBuf,
     last_update: Duration,
     update_interval: Duration,
 }
 
-impl<M> Debug for OnDiskJsonAggregateMonitor<M>
+impl Debug for OnDiskJsonAggregateMonitor {
-where
-    M: Debug,
-{
     fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
         f.debug_struct("OnDiskJsonAggregateMonitor")
-            .field("base", &self.base)
             .field("last_update", &self.last_update)
             .field("update_interval", &self.update_interval)
             .field("json_path", &self.json_path)
@@ -34,20 +29,13 @@ where
     }
 }
 
-impl<M> Monitor for OnDiskJsonAggregateMonitor<M>
+impl Monitor for OnDiskJsonAggregateMonitor {
-where
-    M: Monitor,
-{
     fn display(
         &mut self,
         client_stats_manager: &mut ClientStatsManager,
-        event_msg: &str,
+        _event_msg: &str,
-        sender_id: ClientId,
+        _sender_id: ClientId,
     ) {
-        // First let the base monitor handle its display
-        self.base
-            .display(client_stats_manager, event_msg, sender_id);
-
         // Write JSON stats if update interval has elapsed
         let cur_time = current_time();
         if cur_time - self.last_update >= self.update_interval {
@@ -83,22 +71,21 @@ where
     }
 }
 
-impl<M> OnDiskJsonAggregateMonitor<M> {
+impl OnDiskJsonAggregateMonitor {
     /// Creates a new [`OnDiskJsonAggregateMonitor`]
-    pub fn new<P>(base: M, json_path: P) -> Self
+    pub fn new<P>(json_path: P) -> Self
     where
         P: Into<PathBuf>,
     {
-        Self::with_interval(json_path, base, Duration::from_secs(10))
+        Self::with_interval(json_path, Duration::from_secs(10))
     }
 
     /// Creates a new [`OnDiskJsonAggregateMonitor`] with custom update interval
-    pub fn with_interval<P>(json_path: P, base: M, update_interval: Duration) -> Self
+    pub fn with_interval<P>(json_path: P, update_interval: Duration) -> Self
     where
         P: Into<PathBuf>,
     {
         Self {
-            base,
             json_path: json_path.into(),
             last_update: current_time() - update_interval,
             update_interval,