api2/node/syslog.rs: implement dump journal

src/api2/node/syslog.rs

@@ -8,12 +8,71 @@ use serde_json::{json, Value};
 use std::sync::Arc;
 use lazy_static::lazy_static;
 use crate::tools::common_regex;
+use std::process::{Command, Stdio};
+
+fn dump_journal(
+    start: Option<u64>,
+    limit: Option<u64>,
+    since: Option<&str>,
+    until: Option<&str>,
+    service: Option<&str>,
+) -> Result<(u64, Vec<Value>), Error> {
+
+    let mut args = vec!["-o", "short", "--no-pager"];
+
+    if let Some(service) = service { args.push("--unit"); args.push(service); }
+    if let Some(since) = since { args.push("--since"); args.push(since); }
+    if let Some(until) = until { args.push("--until"); args.push(until); }
+
+    let mut lines: Vec<Value> = vec![];
+    let mut limit = limit.unwrap_or(50);
+    let start = start.unwrap_or(0);
+    let mut count: u64 = 0;
+
+    let mut child = Command::new("/bin/journalctl")
+        .args(&args)
+        .stdout(Stdio::piped())
+        .spawn()?;
+
+    use std::io::{BufRead,BufReader};
+
+    if let Some(ref mut stdout) = child.stdout {
+        for line in BufReader::new(stdout).lines() {
+            count += 1;
+            if count < start { continue };
+	    if limit <= 0 { continue };
+
+            let line = line?; // fixme: nom utf8??
+            lines.push(json!({ "n": count, "t": line }));
+
+            limit -= 1;
+        }
+    }
+
+    let status = child.wait()?; // fixme: check status
+
+    // HACK: ExtJS store.guaranteeRange() does not like empty array
+    // so we add a line
+    if count == 0 {
+        count += 1;
+	lines.push(json!({ "n": count, "t": "no content"}));
+    }
+
+    Ok((count, lines))
+}
 
 fn get_syslog(param: Value, _info: &ApiMethod) -> Result<Value, Error> {
 
-    let result = json!({});
+    let (count, lines) = dump_journal(
+        param["start"].as_u64(),
+        param["limit"].as_u64(),
+        param["since"].as_str(),
+        param["until"].as_str(),
+        param["service"].as_str());
 
-    Ok(result)
+    //fixme: $restenv->set_result_attrib('total', $count);
+
+    Ok(json!(lines))
 }
 
 lazy_static! {