Refactor datafile path handling

disk/src/paths.rs

@@ -0,0 +1,46 @@
+use err::Error;
+use netpod::timeunits::MS;
+use netpod::{ChannelConfig, Nanos, Node};
+use std::path::PathBuf;
+
+pub fn datapath(timebin: u64, config: &netpod::ChannelConfig, node: &Node) -> PathBuf {
+    //let pre = "/data/sf-databuffer/daq_swissfel";
+    node.data_base_path
+        .join(format!("{}_{}", node.ksprefix, config.keyspace))
+        .join("byTime")
+        .join(config.channel.name.clone())
+        .join(format!("{:019}", timebin))
+        .join(format!("{:010}", node.split))
+        .join(format!(
+            "{:019}_00000_Data",
+            config.time_bin_size / netpod::timeunits::MS
+        ))
+}
+
+pub fn channel_timebins_dir_path(channel_config: &ChannelConfig, node: &Node) -> Result<PathBuf, Error> {
+    let ret = node
+        .data_base_path
+        .join(format!("{}_{}", node.ksprefix, channel_config.keyspace))
+        .join("byTime")
+        .join(&channel_config.channel.name);
+    Ok(ret)
+}
+
+pub fn data_dir_path(ts: Nanos, channel_config: &ChannelConfig, node: &Node) -> Result<PathBuf, Error> {
+    let ret = channel_timebins_dir_path(channel_config, node)?
+        .join(format!("{:019}", ts.ns / channel_config.time_bin_size))
+        .join(format!("{:010}", node.split));
+    Ok(ret)
+}
+
+pub fn data_path(ts: Nanos, channel_config: &ChannelConfig, node: &Node) -> Result<PathBuf, Error> {
+    let fname = format!("{:019}_{:05}_Data", channel_config.time_bin_size / MS, 0);
+    let ret = data_dir_path(ts, channel_config, node)?.join(fname);
+    Ok(ret)
+}
+
+pub fn index_path(ts: Nanos, channel_config: &ChannelConfig, node: &Node) -> Result<PathBuf, Error> {
+    let fname = format!("{:019}_{:05}_Data_Index", channel_config.time_bin_size / MS, 0);
+    let ret = data_dir_path(ts, channel_config, node)?.join(fname);
+    Ok(ret)
+}