Update: release csv-timeline function

src/afterfact.rs

@@ -1,8 +1,10 @@
 use crate::detections::configs;
 use crate::detections::print;
-use chrono::{DateTime, Utc};
+use chrono::{DateTime, TimeZone, Utc};
 use serde::Serialize;
 use std::error::Error;
+use std::fs::File;
+use std::io;
 use std::process;
 
 #[derive(Debug, Serialize)]
@@ -13,16 +15,27 @@ pub struct CsvFormat<'a> {
 }
 
 pub fn after_fact() {
+    let mut target: Box<dyn io::Write> =
         if let Some(csv_path) = configs::singleton().args.value_of("csv-timeline") {
-        if let Err(err) = emit_csv(csv_path) {
+            match File::create(csv_path) {
-            println!("{}", err);
+                Ok(file) => Box::new(file),
+                Err(err) => {
+                    println!("Failed to open file. {}", err);
                     process::exit(1);
                 }
             }
+        } else {
+            Box::new(io::stdout())
+        };
+
+    if let Err(err) = emit_csv(&mut target) {
+        println!("Failed to write CSV. {}", err);
+        process::exit(1);
+    }
 }
 
-fn emit_csv(path: &str) -> Result<(), Box<dyn Error>> {
+fn emit_csv(writer: &mut Box<dyn io::Write>) -> Result<(), Box<dyn Error>> {
-    let mut wtr = csv::Writer::from_path(path)?;
+    let mut wtr = csv::WriterBuilder::new().from_writer(writer);
     let messages = print::MESSAGES.lock().unwrap();
 
     for (time, texts) in messages.iter() {
@@ -37,19 +50,14 @@ fn emit_csv(path: &str) -> Result<(), Box<dyn Error>> {
     Ok(())
 }
 
-#[cfg(test)]
-mod tests {
-
-    use crate::afterfact::emit_csv;
-    use crate::detections::print;
-    use serde_json::Value;
-    use std::fs::{read_to_string, remove_file};
-
 #[test]
 fn test_emit_csv() {
+    use serde_json::Value;
+    use std::fs::{read_to_string, remove_file};
     {
         let mut messages = print::MESSAGES.lock().unwrap();
-            let json_str = r##"
+
+        let val = r##"
         {
             "Event": {
                 "EventData": {
@@ -65,16 +73,17 @@ mod tests {
             }
         }
     "##;
-            let event_record: Value = serde_json::from_str(json_str).unwrap();
+        let event: Value = serde_json::from_str(val).unwrap();
-
+        messages.insert(&event, "pokepoke".to_string());
-            messages.insert(&event_record, "pokepoke".to_string());
     }
 
     let expect = "Time,Message
 1996-02-27T01:05:01Z,pokepoke
 ";
 
-        assert!(emit_csv(&"./test_emit_csv.csv".to_string()).is_ok());
+    let mut file: Box<dyn io::Write> =
+        Box::new(File::create("./test_emit_csv.csv".to_string()).unwrap());
+    assert!(emit_csv(&mut file).is_ok());
 
     match read_to_string("./test_emit_csv.csv") {
         Err(_) => panic!("Failed to open file"),
@@ -83,4 +92,3 @@ mod tests {
 
     assert!(remove_file("./test_emit_csv.csv").is_ok());
 }
-}

src/detections/detection.rs

@@ -1,7 +1,7 @@
 extern crate chrono;
 extern crate csv;
 
-use crate::detections::print::Message;
+use crate::detections::print::MESSAGES;
 use crate::detections::rule;
 use crate::detections::rule::RuleNode;
 use crate::yaml::ParseYaml;
@@ -81,7 +81,7 @@ impl Detection {
             .collect();
 
         // selection rule files and collect message
-        let mut message = Message::new();
+        let mut message = MESSAGES.lock().unwrap();
         selection_rules.iter_mut().for_each(|rule| {
             event_records.iter().for_each(|event_record| {
                 if !rule.select(event_record) {
@@ -94,8 +94,5 @@ impl Detection {
                 )
             });
         });
-
-        // output message
-        message.print();
     }
 }