From be5ba0b1c3cb993543e50a4325e40ceaeb8082fb Mon Sep 17 00:00:00 2001
From: Tom Smeding <tom.smeding@gmail.com>
Date: Sat, 28 Mar 2020 21:29:50 +0100
Subject: controller-cli: Proof of concept CLI

---
 controller-cli/src/main.rs | 120 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 controller-cli/src/main.rs

(limited to 'controller-cli/src/main.rs')

diff --git a/controller-cli/src/main.rs b/controller-cli/src/main.rs
new file mode 100644
index 0000000..bf058b7
--- /dev/null
+++ b/controller-cli/src/main.rs
@@ -0,0 +1,120 @@
+use std::io::{self, Write};
+use dd_controller::ComputePool;
+use dd_utils::idgen::IdGen;
+
+fn prompt(prefix: &str) -> io::Result<Option<String>> {
+    print!("{}> ", prefix);
+    io::stdout().flush()?;
+    let mut line = String::new();
+    let n = io::stdin().read_line(&mut line)?;
+    if n == 0 {
+        Ok(None)
+    } else {
+        line.pop();  // remove the newline
+        Ok(Some(line))
+    }
+}
+
+fn main() -> io::Result<()> {
+    let mut pool = ComputePool::new(12345)?;
+
+    // for _ in 0..10 {
+    //     println!("Current parallelism: {}", pool.current_job_parallelism()?);
+    //     std::thread::sleep(std::time::Duration::from_secs(2));
+    // }
+
+    let mut job_idgen = IdGen::new(1);
+
+    loop {
+        let num_workers = match pool.current_job_parallelism() {
+            Ok(num) => num,
+            Err(e) => {
+                eprintln!("ERROR getting number of workers: {}", e);
+                break;
+            }
+        };
+
+        let line = match prompt(&format!("[{}]", num_workers))? {
+            Some(line) => line,
+            None => break
+        };
+
+        let words = line.split_whitespace().collect::<Vec<_>>();
+        if words.len() == 0 {
+            continue;
+        }
+
+        match words[0] {
+            "quit" | "exit" => {
+                break;
+            }
+
+            "core" => {
+                let filename = match prompt("file name")? { Some(s) => s, None => break };
+
+                match std::fs::read(&filename) {
+                    Ok(contents) => {
+                        match pool.set_core("user-core".to_string(), contents) {
+                            Ok(()) => println!("Core set."),
+                            Err(e) => println!("Could not set core: {}", e),
+                        }
+                    }
+
+                    Err(e) => {
+                        println!("Cannot open file '{}': {}", filename, e);
+                    }
+                }
+            }
+
+            "job" => {
+                let filename = match prompt("job input file name")? { Some(s) => s, None => break };
+
+                match std::fs::read(&filename) {
+                    Ok(contents) => {
+                        let jobid = job_idgen.gen();
+                        match pool.submit_job(jobid, contents) {
+                            Ok(()) => println!("Submitted with id {}.", jobid),
+                            Err(e) => println!("Could not submit: {}", e),
+                        }
+                    }
+
+                    Err(e) => {
+                        println!("Cannot open file '{}': {}", filename, e);
+                    }
+                }
+            }
+
+            "wait" => {
+                match pool.next_completion_event() {
+                    Ok(Some(event)) => {
+                        println!("Result from job {}:", event.jobid);
+                        match event.result {
+                            Ok((retcode, output)) => {
+                                println!("Return code {}, output = {}", retcode, String::from_utf8_lossy(&output));
+                            }
+                            Err(err) => {
+                                println!("Worker returned error: {}", err);
+                            }
+                        }
+                    }
+
+                    Ok(None) => {
+                        println!("No jobs running");
+                    }
+
+                    Err(err) => {
+                        println!("ERROR getting events: {}", err);
+                        break;
+                    }
+                }
+            }
+
+            cmd => {
+                println!("Unknown command '{}'", cmd);
+            }
+        }
+    }
+
+    pool.close()?;
+    Ok(())
+}
-- 
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