src/api2/node/tasks.rs: start upid API

src/api2/node/tasks.rs

@@ -1,11 +1,85 @@
 use failure::*;
 
-//use crate::tools;
+use crate::tools;
 use crate::api_schema::*;
 use crate::api_schema::router::*;
 use serde_json::{json, Value};
+use std::sync::Arc;
+use std::fs::File;
+use std::io::{BufRead,BufReader};
 
-use crate::server;
+use crate::server::{self, UPID};
+
+fn get_task_status(
+    param: Value,
+    _info: &ApiMethod,
+    _rpcenv: &mut RpcEnvironment,
+) -> Result<Value, Error> {
+
+    let upid = extract_upid(&param)?;
+
+    let result = if upid.is_active() {
+        json!({
+            "status": "running",
+        })
+    } else {
+         json!({
+            "status": "running",
+        })
+    };
+
+    Ok(result)
+}
+
+fn extract_upid(param: &Value) -> Result<UPID, Error> {
+
+    let upid_str = tools::required_string_param(&param, "upid")?;
+
+    let upid = match upid_str.parse::<UPID>() {
+        Ok(v) => v,
+        Err(err) => bail!("unable to parse UPID '{}' - {}", upid_str, err),
+    };
+
+    Ok(upid)
+}
+
+fn read_task_log(
+    param: Value,
+    _info: &ApiMethod,
+    _rpcenv: &mut RpcEnvironment,
+) -> Result<Value, Error> {
+
+    let upid = extract_upid(&param)?;
+    let start = param["start"].as_u64().unwrap_or(0);
+    let mut limit = param["limit"].as_u64().unwrap_or(50);
+    let mut count: u64 = 0;
+
+    let path = upid.log_path();
+
+    let file = File::open(path)?;
+
+    let mut lines: Vec<Value> = vec![];
+
+    for line in BufReader::new(file).lines() {
+        match line {
+            Ok(line) => {
+                count += 1;
+                if count < start { continue };
+	        if limit <= 0 { continue };
+
+                lines.push(json!({ "n": count, "t": line }));
+
+                limit -= 1;
+            }
+            Err(err) => {
+                log::error!("reading task log failed: {}", err);
+                break;
+            }
+        }
+    }
+
+    Ok(json!(lines))
+}
 
 fn list_tasks(
     param: Value,
@@ -67,6 +141,57 @@ fn list_tasks(
 
 pub fn router() -> Router {
 
+    let upid_schema : Arc<Schema> = Arc::new(
+        StringSchema::new("Unique Process/Task ID.")
+            .max_length(256)
+            .into()
+    );
+
+    let upid_api = Router::new()
+        .get(ApiMethod::new(
+            |_,_,_| {
+                let mut result = vec![];
+                for cmd in &["log", "status"] {
+                    result.push(json!({"subdir": cmd }));
+                }
+                Ok(Value::from(result))
+            },
+            ObjectSchema::new("Directory index.")
+                .required("upid", upid_schema.clone()))
+        )
+        .subdir(
+            "log", Router::new()
+                .get(
+                    ApiMethod::new(
+                        read_task_log,
+                        ObjectSchema::new("Read task log.")
+                            .required("upid", upid_schema.clone())
+                            .optional(
+                                "start",
+                                IntegerSchema::new("Start at this line.")
+                                    .minimum(0)
+                                    .default(0)
+                            )
+                            .optional(
+                                "limit",
+                                IntegerSchema::new("Only list this amount of lines.")
+                                    .minimum(0)
+                                    .default(50)
+                            )
+                    )
+                )
+        )
+        .subdir(
+            "status", Router::new()
+                .get(
+                    ApiMethod::new(
+                        get_task_status,
+                        ObjectSchema::new("Get task status.")
+                            .required("upid", upid_schema.clone()))
+                )
+        );
+
+
     let route = Router::new()
         .get(ApiMethod::new(
             list_tasks,
@@ -92,7 +217,8 @@ pub fn router() -> Router {
                     StringSchema::new("Only list tasks from this user.")
                 )
            )
-        );
+        )
+        .match_all("upid", upid_api);
 
     route
 }