[pbs-devel] [PATCH proxmox-backup v5 5/8] api: add get_active_operations endpoint

[Hannes Laimer <h.laimer@proxmox.com>]

Signed-off-by: Hannes Laimer <h.laimer@proxmox.com>
---
 pbs-datastore/src/task_tracking.rs | 30 ++++++++++++++++++++++++++++
 src/api2/admin/datastore.rs        | 32 +++++++++++++++++++++++++++++-
 2 files changed, 61 insertions(+), 1 deletion(-)

diff --git a/pbs-datastore/src/task_tracking.rs b/pbs-datastore/src/task_tracking.rs
index 06266e55..3f9693fa 100644
--- a/pbs-datastore/src/task_tracking.rs
+++ b/pbs-datastore/src/task_tracking.rs
@@ -14,6 +14,36 @@ struct TaskOperations {
     writing_operations: i64,
 }
 
+pub fn get_active_operations(name: &str, operation: Operation) -> Result<i64, Error> {
+    let path = PathBuf::from(format!("{}/{}", crate::ACTIVE_OPERATIONS_DIR, name));
+    let lock_path = PathBuf::from(format!("{}/{}.lock", crate::ACTIVE_OPERATIONS_DIR, name));
+
+    let user = pbs_config::backup_user()?;
+    let options = CreateOptions::new()
+        .group(user.gid)
+        .owner(user.uid)
+        .perm(nix::sys::stat::Mode::from_bits_truncate(0o660));
+
+    let timeout = std::time::Duration::new(10, 0);
+    open_file_locked(&lock_path, timeout, true, options.clone())?;
+
+    Ok(match file_read_optional_string(&path)? {
+        Some(data) => {
+            let active_tasks: Vec<TaskOperations> = serde_json::from_str(&data)?;
+            active_tasks.iter()
+                .filter(|task| procfs::check_process_running(task.pid as pid_t).is_some())
+                .map(|task| {
+                    match operation {
+                        Operation::Read => task.reading_operations,
+                        Operation::Write => task.writing_operations,
+                    }
+                })
+                .sum()
+        }
+        None => 0,
+    })
+}
+
 pub fn update_active_operations(name: &str, operation: Operation, count: i64) -> Result<(), Error> {
     let path = PathBuf::from(format!("{}/{}", crate::ACTIVE_OPERATIONS_DIR, name));
     let lock_path = PathBuf::from(format!("{}/{}.lock", crate::ACTIVE_OPERATIONS_DIR, name));
diff --git a/src/api2/admin/datastore.rs b/src/api2/admin/datastore.rs
index ce710938..878f21d4 100644
--- a/src/api2/admin/datastore.rs
+++ b/src/api2/admin/datastore.rs
@@ -43,7 +43,7 @@ use pbs_api_types::{ Authid, BackupContent, Counts, CryptMode,
 use pbs_client::pxar::create_zip;
 use pbs_datastore::{
     check_backup_owner, DataStore, BackupDir, BackupGroup, StoreProgress, LocalChunkReader,
-    CATALOG_NAME,
+    CATALOG_NAME, task_tracking
 };
 use pbs_datastore::backup_info::BackupInfo;
 use pbs_datastore::cached_chunk_reader::CachedChunkReader;
@@ -1590,6 +1590,31 @@ pub fn get_rrd_stats(
     )
 }
 
+#[api(
+    input: {
+        properties: {
+            store: {
+                schema: DATASTORE_SCHEMA,
+            },
+        },
+    },
+    access: {
+        permission: &Permission::Privilege(&["datastore", "{store}"], PRIV_DATASTORE_AUDIT, true),
+    },
+)]
+/// Read datastore stats
+pub fn get_active_operations(
+    store: String,
+    _param: Value,
+) -> Result<Value, Error> {
+    let reading = task_tracking::get_active_operations(&store, Operation::Read)?;
+    let writing = task_tracking::get_active_operations(&store, Operation::Write)?;
+    Ok(json!({
+        "read": reading,
+        "write": writing
+    }))
+}
+
 #[api(
     input: {
         properties: {
@@ -1947,6 +1972,11 @@ pub fn set_backup_owner(
 
 #[sortable]
 const DATASTORE_INFO_SUBDIRS: SubdirMap = &[
+    (
+        "active-operations",
+        &Router::new()
+            .get(&API_METHOD_GET_ACTIVE_OPERATIONS)
+    ),
     (
         "catalog",
         &Router::new()
-- 
2.30.2