rbpf-cli: support json output

rbpf-cli/src/main.rs

@@ -19,10 +19,11 @@ use {
         transaction_context::TransactionContext,
     },
     std::{
+        fmt::{Debug, Formatter},
         fs::File,
         io::{Read, Seek, SeekFrom},
         path::Path,
-        time::Instant,
+        time::{Duration, Instant},
     },
 };
 
@@ -43,10 +44,10 @@ struct Input {
 fn load_accounts(path: &Path) -> Result<Input> {
     let file = File::open(path).unwrap();
     let input: Input = serde_json::from_reader(file)?;
-    println!("Program input:");
-    println!("accounts {:?}", &input.accounts);
-    println!("instruction_data {:?}", &input.instruction_data);
-    println!("----------------------------------------");
+    eprintln!("Program input:");
+    eprintln!("accounts {:?}", &input.accounts);
+    eprintln!("instruction_data {:?}", &input.instruction_data);
+    eprintln!("----------------------------------------");
     Ok(input)
 }
 
@@ -157,6 +158,15 @@ native machine code before execting it in the virtual machine.",
                 .short('v')
                 .long("verify"),
         )
+        .arg(
+            Arg::new("output_format")
+                .about("Return information in specified output format")
+                .long("output")
+                .value_name("FORMAT")
+                .global(true)
+                .takes_value(true)
+                .possible_values(&["json", "json-compact"]),
+        )
         .get_matches();
 
     let config = Config {
@@ -286,7 +296,6 @@ native machine code before execting it in the virtual machine.",
         &account_lengths,
     )
     .unwrap();
-    println!("Program output:");
     let start_time = Instant::now();
     let result = if matches.value_of("use").unwrap() == "interpreter" {
         vm.execute_program_interpreted(&mut instruction_meter)
@@ -294,17 +303,33 @@ native machine code before execting it in the virtual machine.",
         vm.execute_program_jit(&mut instruction_meter)
     };
     let duration = Instant::now() - start_time;
-    println!("Result: {:?}", result);
-    println!("Instruction Count: {}", vm.get_total_instruction_count());
-    println!("Execution time: {} us", duration.as_micros());
+
+    let output = Output {
+        result: format!("{:?}", result),
+        instruction_count: vm.get_total_instruction_count(),
+        execution_time: duration,
+    };
+    match matches.value_of("output_format") {
+        Some("json") => {
+            println!("{}", serde_json::to_string_pretty(&output).unwrap());
+        }
+        Some("json-compact") => {
+            println!("{}", serde_json::to_string(&output).unwrap());
+        }
+        _ => {
+            println!("Program output:");
+            println!("{:?}", output);
+        }
+    }
+
     if matches.is_present("trace") {
-        println!("Trace is saved in trace.out");
+        eprintln!("Trace is saved in trace.out");
         let mut file = File::create("trace.out").unwrap();
         let analysis = Analysis::from_executable(&executable);
         vm.get_tracer().write(&mut file, &analysis).unwrap();
     }
     if matches.is_present("profile") {
-        println!("Profile is saved in profile.dot");
+        eprintln!("Profile is saved in profile.dot");
         let tracer = &vm.get_tracer();
         let dynamic_analysis = DynamicAnalysis::new(tracer, &analysis);
         let mut file = File::create("profile.dot").unwrap();
@@ -313,3 +338,19 @@ native machine code before execting it in the virtual machine.",
             .unwrap();
     }
 }
+
+#[derive(Serialize)]
+struct Output {
+    result: String,
+    instruction_count: u64,
+    execution_time: Duration,
+}
+
+impl Debug for Output {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        writeln!(f, "Result: {}", self.result)?;
+        writeln!(f, "Instruction Count: {}", self.instruction_count)?;
+        writeln!(f, "Execution time: {} us", self.execution_time.as_micros())?;
+        Ok(())
+    }
+}