From 89f2f02ab813fe19fd029e95f6a2f6ce65c5a16b Mon Sep 17 00:00:00 2001
From: bnewbold <bnewbold@robocracy.org>
Date: Sun, 9 Oct 2016 16:32:02 -0700
Subject: upate python example with KeyboardInterrupt catching

---
 Cargo.toml               |  1 +
 examples/einhorn_http.py | 24 ++++++++++++++++++------
 src/main.rs              | 48 ++++++++++++++++++++++++++++++++++++++++--------
 3 files changed, 59 insertions(+), 14 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index 923ba92..4896865 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,3 +14,4 @@ chrono = "0.2"
 chan = "0.1"
 chan-signal = "0.1"
 uuid = { version = "0.2", features = ["v4"] }
+# XXX: num = "0.1"
diff --git a/examples/einhorn_http.py b/examples/einhorn_http.py
index 7d93e61..304d01a 100755
--- a/examples/einhorn_http.py
+++ b/examples/einhorn_http.py
@@ -1,4 +1,11 @@
-#!/usr/bin/python3
+#!/usr/bin/env python3
+"""
+This small example program demonstrates one way to integerate with Einhorn using
+Python (3).
+
+It serves up the current working directory over HTTP on either the
+Einhorn-supplied socket or localhost:8080.
+"""
 
 import os
 import sys
@@ -16,11 +23,11 @@ class EinhornTCPServer(socketserver.TCPServer):
             fd = int(os.environ['EINHORN_FD_0'])
             print("Will try to listen with fd=%d" % fd)
         except KeyError:
-            print("Couldn't find EINHORN_FD_0 env variable... is this running under einhorn?")
-            sys.exit(1)
+            raise EnvironmentError("Couldn't find EINHORN_FD_0 env variable... is this running under einhorn?")
 
-        #self.socket = socket.fromfd(socket.AF_INET, socket.SOCK_STREAM, fd)
         self.socket = socket.socket(fileno=fd)
+        # alternative?
+        #self.socket = socket.fromfd(socket.AF_INET, socket.SOCK_STREAM, fd)
 
         try:
             self.server_activate()
@@ -32,9 +39,14 @@ if __name__ == "__main__":
     Handler = http.server.SimpleHTTPRequestHandler
     try:
         httpd = EinhornTCPServer(None, Handler)
-    except:
+    except EnvironmentError as ee:
+        print(ee)
         print("Falling back on vanilla http server on 8080")
         httpd = socketserver.TCPServer(("localhost", 8080), Handler)
 
     print("Serving!")
-    httpd.serve_forever()
+    try:
+        httpd.serve_forever()
+    except KeyboardInterrupt:
+        print("Caught KeyboardInterrupt, shutting down")
+        httpd.server_close()
diff --git a/src/main.rs b/src/main.rs
index c1e06b7..e849779 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -87,7 +87,7 @@ impl Offspring {
     }
 
     pub fn spawn(&mut self, cfg: &mut EinConfig) -> Result<(), String> {
-        if self.state != OffspringState::Expectant && self.state != OffspringState::Dead {
+        if self.is_active() {
             return Err(format!("Can't spawn from state: {:?}", self.state));
         }
         self.process = Some(cfg.cmd.spawn().expect("error spawning"));
@@ -95,6 +95,34 @@ impl Offspring {
         self.attempts = 0;
         Ok(())
     }
+
+    pub fn is_active(&self) -> bool {
+        match self.state {
+            OffspringState::Expectant => false,
+            OffspringState::Infancy => true,
+            OffspringState::Healthy => true,
+            OffspringState::Notified => true,
+            OffspringState::Dead => false,
+        }
+    }
+
+    pub fn signal(&mut self, sig: Signal) {
+        if !self.is_active() {
+            return;
+        }
+        let nix_sig = match sig {
+            Signal::HUP => nix::sys::signal::Signal::SIGHUP,
+            Signal::INT => nix::sys::signal::Signal::SIGINT,
+            _ => { println!("Unexpected signal: {:?}", sig); return; },
+        };
+        match self.process {
+            Some(ref p) => { nix::sys::signal::kill(p.id() as i32, nix_sig).unwrap(); },
+            None => (),
+        }
+        // TODO: abs probably isn't the best way to i32 -> u32 here
+        //nix::sys::signal::kill(num::abs(self.process.unwrap().id()), nix_sig);
+        //let pid = self.process.unwrap().id();
+    }
 }
 
 #[derive(Copy, Clone, Debug, PartialEq)]
@@ -107,7 +135,6 @@ fn shepard(mut cfg: EinConfig, signal_rx: Receiver<Signal>) {
 
     //// create timer
     let timer = timer::Timer::new();
-    // XXX: these signatures are bogus
     let (timer_tx, timer_rx): (Sender<TimerAction>, Receiver<TimerAction>) = chan::async();
 
     //// birth the initial set of offspring
@@ -127,11 +154,15 @@ fn shepard(mut cfg: EinConfig, signal_rx: Receiver<Signal>) {
     //// infinite select() loop over timers, signals, rpc
     loop {
         chan_select! {
-            timer_rx.recv() => println!("Timer tick'd"),
-            signal_rx.recv() -> sig => {
-                println!("");
-                println!("Signal received! {:?}", sig);
-                break;
+            timer_rx.recv() => { println!("Timer tick'd"); "TIMER" },
+            signal_rx.recv() -> sig => match sig.expect("Error with signal handler") {
+                // XXX: Signal::HUP => brood.iter().for_each(|o| o.signal(sig)),
+                Signal::INT | Signal::TERM=> {
+                    println!("Notifying children...");
+                    // XXX: brood.iter().for_each(|o| o.signal(sig));
+                    break;
+                },
+                _ => "Other"
             }
         }
     }
@@ -144,8 +175,8 @@ fn shepard(mut cfg: EinConfig, signal_rx: Receiver<Signal>) {
             None => (),
         }
     }
-*/
     println!("Done.");
+*/
 }
 
 fn print_usage(opts: Options) {
@@ -209,6 +240,7 @@ fn main() {
     builder.init().unwrap();
 
     let binds: Vec<TcpListener> = sock_addrs.iter().map(|sa| {
+        // XXX: SO_REUSE here
         TcpListener::bind(sa).unwrap()
     }).collect();
 
-- 
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