[pbs-devel] [PATCH proxmox-backup v2] tape/drive: fix logging when requesting media
Dietmar Maurer
dietmar at proxmox.com
Wed Jun 30 10:31:12 CEST 2021
From: Dominik Csapak <d.csapak at proxmox.com>
we try to load the correct media in a loop until we find the correct tape.
when encountering an error or wrong tape, we want to log that (and send
an email if one is set) that requests the correct tape.
while trying to avoid printing the same errors more than once in a row,
we had at least one case (starting with an empty tape in the drive)
which would not print/send any tape request.
reworking that code to use a custom 'TapeRequest' enum, which contains
the state + error message, and a helper that prints and sends an email
when the state changes
this reduces the change check/log to a single variable, instead of 4
(tried, last_media_uuid, last_error, failure_reason)
Signed-off-by: Dominik Csapak <d.csapak at proxmox.com>
Signed-off-by: Dietmar Maurer <dietmar at proxmox.com>
---
Changes since v1:
- rename TapeRequest into TapeRequestError
- format error messages inside Display trait
- rename request_state -> last_error (avoid "_state")
Still not sure if we should send an email every time the error changes?
src/tape/drive/mod.rs | 144 ++++++++++++++++++++++++++----------------
1 file changed, 89 insertions(+), 55 deletions(-)
diff --git a/src/tape/drive/mod.rs b/src/tape/drive/mod.rs
index 7bc02f9e..7c218a46 100644
--- a/src/tape/drive/mod.rs
+++ b/src/tape/drive/mod.rs
@@ -321,6 +321,37 @@ pub fn open_drive(
}
}
+#[derive(PartialEq, Eq)]
+enum TapeRequestError {
+ None,
+ EmptyTape,
+ OpenFailed(String),
+ WrongLabel(String),
+ ReadFailed(String),
+}
+
+impl std::fmt::Display for TapeRequestError {
+ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+ match self {
+ TapeRequestError::None => {
+ write!(f, "no error")
+ },
+ TapeRequestError::OpenFailed(reason) => {
+ write!(f, "tape open failed - {}", reason)
+ }
+ TapeRequestError::WrongLabel(label) => {
+ write!(f, "wrong media label {}", label)
+ }
+ TapeRequestError::EmptyTape => {
+ write!(f, "found empty media without label (please label all tapes first)")
+ }
+ TapeRequestError::ReadFailed(reason) => {
+ write!(f, "tape read failed - {}", reason)
+ }
+ }
+ }
+}
+
/// Requests a specific 'media' to be inserted into 'drive'. Within a
/// loop, this then tries to read the media label and waits until it
/// finds the requested media.
@@ -388,84 +419,87 @@ pub fn request_and_load_media(
return Ok((handle, media_id));
}
- let mut last_media_uuid = None;
- let mut last_error = None;
-
- let mut tried = false;
- let mut failure_reason = None;
+ let mut last_error = TapeRequestError::None;
+
+ let update_and_log_request_error =
+ |old: &mut TapeRequestError, new: TapeRequestError| -> Result<(), Error>
+ {
+ if new != *old {
+ task_log!(worker, "{}", new);
+ task_log!(
+ worker,
+ "Please insert media '{}' into drive '{}'",
+ label_text,
+ drive
+ );
+ if let Some(to) = notify_email {
+ send_load_media_email(
+ drive,
+ &label_text,
+ to,
+ Some(new.to_string()),
+ )?;
+ }
+ *old = new;
+ }
+ Ok(())
+ };
loop {
worker.check_abort()?;
- if tried {
- if let Some(reason) = failure_reason {
- task_log!(worker, "Please insert media '{}' into drive '{}'", label_text, drive);
- if let Some(to) = notify_email {
- send_load_media_email(drive, &label_text, to, Some(reason))?;
- }
- }
-
- failure_reason = None;
-
+ if last_error != TapeRequestError::None {
for _ in 0..50 { // delay 5 seconds
worker.check_abort()?;
std::thread::sleep(std::time::Duration::from_millis(100));
}
+ } else {
+ task_log!(
+ worker,
+ "Checking for media '{}' in drive '{}'",
+ label_text,
+ drive
+ );
}
- tried = true;
-
let mut handle = match drive_config.open() {
Ok(handle) => handle,
Err(err) => {
- let err = err.to_string();
- if Some(err.clone()) != last_error {
- task_log!(worker, "tape open failed - {}", err);
- last_error = Some(err);
- failure_reason = last_error.clone();
- }
+ update_and_log_request_error(
+ &mut last_error,
+ TapeRequestError::OpenFailed(err.to_string()),
+ )?;
continue;
}
};
- match handle.read_label() {
+ let request_error = match handle.read_label() {
+ Ok((Some(media_id), _)) if media_id.label.uuid == label.uuid => {
+ task_log!(
+ worker,
+ "found media label {} ({})",
+ media_id.label.label_text,
+ media_id.label.uuid.to_string(),
+ );
+ return Ok((Box::new(handle), media_id));
+ }
Ok((Some(media_id), _)) => {
- if media_id.label.uuid == label.uuid {
- task_log!(
- worker,
- "found media label {} ({})",
- media_id.label.label_text,
- media_id.label.uuid.to_string(),
- );
- return Ok((Box::new(handle), media_id));
- } else if Some(media_id.label.uuid.clone()) != last_media_uuid {
- let err = format!(
- "wrong media label {} ({})",
- media_id.label.label_text,
- media_id.label.uuid.to_string(),
- );
- task_log!(worker, "{}", err);
- last_media_uuid = Some(media_id.label.uuid);
- failure_reason = Some(err);
- }
+ let label_string = format!(
+ "{} ({})",
+ media_id.label.label_text,
+ media_id.label.uuid.to_string(),
+ );
+ TapeRequestError::WrongLabel(label_string)
}
Ok((None, _)) => {
- if last_media_uuid.is_some() {
- let err = "found empty media without label (please label all tapes first)";
- task_log!(worker, "{}", err);
- last_media_uuid = None;
- failure_reason = Some(err.to_string());
- }
+ TapeRequestError::EmptyTape
}
Err(err) => {
- let err = err.to_string();
- if Some(err.clone()) != last_error {
- task_log!(worker, "tape open failed - {}", err);
- last_error = Some(err);
- failure_reason = last_error.clone();
- }
+ TapeRequestError::ReadFailed(err.to_string())
}
- }
+ };
+
+ update_and_log_request_error(&mut last_error, request_error)?;
}
}
_ => bail!("drive type '{}' not implemented!"),
--
2.30.2
More information about the pbs-devel
mailing list