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[proxmox-backup.git] / src / tape / changer / mod.rs

//! Media changer implementation (SCSI media changer)

mod email;
pub use email::*;

pub mod sg_pt_changer;

pub mod mtx;

mod online_status_map;
pub use online_status_map::*;

use anyhow::{bail, Error};

use crate::api2::types::{
    ScsiTapeChanger,
    LinuxTapeDrive,
};

/// Changer element status.
///
/// Drive and slots may be `Empty`, or contain some media, either
/// with knwon volume tag `VolumeTag(String)`, or without (`Full`).
pub enum ElementStatus {
    Empty,
    Full,
    VolumeTag(String),
}

/// Changer drive status.
pub struct DriveStatus {
    /// The slot the element was loaded from (if known).
    pub loaded_slot: Option<u64>,
    /// The status.
    pub status: ElementStatus,
    /// Drive Identifier (Serial number)
    pub drive_serial_number: Option<String>,
    /// Element Address
    pub element_address: u16,
}

/// Storage element status.
pub struct StorageElementStatus {
    /// Flag for Import/Export slots
    pub import_export: bool,
    /// The status.
    pub status: ElementStatus,
    /// Element Address
    pub element_address: u16,
}

/// Transport element status.
pub struct TransportElementStatus {
    /// The status.
    pub status: ElementStatus,
    /// Element Address
    pub element_address: u16,
}

/// Changer status - show drive/slot usage
pub struct MtxStatus {
    /// List of known drives
    pub drives: Vec<DriveStatus>,
    /// List of known storage slots
    pub slots: Vec<StorageElementStatus>,
    /// Tranport elements
    ///
    /// Note: Some libraries do not report transport elements.
    pub transports: Vec<TransportElementStatus>,
}

impl MtxStatus {

    pub fn slot_address(&self, slot: u64) -> Result<u16, Error> {
        if slot == 0 {
            bail!("invalid slot number '{}' (slots numbers starts at 1)", slot);
        }
        if slot > (self.slots.len() as u64) {
            bail!("invalid slot number '{}' (max {} slots)", slot, self.slots.len());
        }

        Ok(self.slots[(slot -1) as usize].element_address)
    }

    pub fn drive_address(&self, drivenum: u64) -> Result<u16, Error> {
        if drivenum >= (self.drives.len() as u64) {
            bail!("invalid drive number '{}'", drivenum);
        }

        Ok(self.drives[drivenum as usize].element_address)
    }

    pub fn transport_address(&self) -> u16 {
        // simply use first transport
        // (are there changers exposing more than one?)
        // defaults to 0 for changer that do not report transports
        self
            .transports
            .get(0)
            .map(|t| t.element_address)
        .unwrap_or(0u16)
    }
}

/// Interface to SCSI changer devices
pub trait ScsiMediaChange {

    fn status(&mut self) -> Result<MtxStatus, Error>;

    fn load_slot(&mut self, from_slot: u64, drivenum: u64) -> Result<(), Error>;

    fn unload(&mut self, to_slot: u64, drivenum: u64) -> Result<(), Error>;

    fn transfer(&mut self, from_slot: u64, to_slot: u64) -> Result<(), Error>;
}

/// Interface to the media changer device for a single drive
pub trait MediaChange {

    /// Drive number inside changer
    fn drive_number(&self) -> u64;

    /// Drive name (used for debug messages)
    fn drive_name(&self) -> &str;

    /// Returns the changer status
    fn status(&mut self) -> Result<MtxStatus, Error>;

    /// Transfer media from on slot to another (storage or import export slots)
    ///
    /// Target slot needs to be empty
    fn transfer_media(&mut self, from: u64, to: u64) -> Result<(), Error>;

    /// Load media from storage slot into drive
    fn load_media_from_slot(&mut self, slot: u64) -> Result<(), Error>;

    /// Load media by label-text into drive
    ///
    /// This unloads first if the drive is already loaded with another media.
    ///
    /// Note: This refuses to load media inside import/export
    /// slots. Also, you cannot load cleaning units with this
    /// interface.
    fn load_media(&mut self, label_text: &str) -> Result<(), Error> {

        if label_text.starts_with("CLN") {
            bail!("unable to load media '{}' (seems top be a a cleaning units)", label_text);
        }

        let mut status = self.status()?;

        let mut unload_drive = false;

        // already loaded?
        for (i, drive_status) in status.drives.iter().enumerate() {
            if let ElementStatus::VolumeTag(ref tag) = drive_status.status {
                if *tag == label_text {
                    if i as u64 != self.drive_number() {
                        bail!("unable to load media '{}' - media in wrong drive ({} != {})",
                              label_text, i, self.drive_number());
                    }
                    return Ok(()) // already loaded
                }
            }
            if i as u64 == self.drive_number() {
                match drive_status.status {
                    ElementStatus::Empty => { /* OK */ },
                    _ => unload_drive = true,
                 }
            }
        }

        if unload_drive {
            self.unload_to_free_slot(status)?;
            status = self.status()?;
        }

        let mut slot = None;
        for (i, slot_info) in status.slots.iter().enumerate() {
            if let ElementStatus::VolumeTag(ref tag) = slot_info.status {
                if tag == label_text {
                    if slot_info.import_export {
                        bail!("unable to load media '{}' - inside import/export slot", label_text);
                    }
                    slot = Some(i+1);
                    break;
                }
            }
        }

        let slot = match slot {
            None => bail!("unable to find media '{}' (offline?)", label_text),
            Some(slot) => slot,
        };

        self.load_media_from_slot(slot as u64)
    }

    /// Unload media from drive (eject media if necessary)
    fn unload_media(&mut self, target_slot: Option<u64>) -> Result<(), Error>;

    /// List online media labels (label_text/barcodes)
    ///
    /// List acessible (online) label texts. This does not include
    /// media inside import-export slots or cleaning media.
    fn online_media_label_texts(&mut self) -> Result<Vec<String>, Error> {
        let status = self.status()?;

        let mut list = Vec::new();

        for drive_status in status.drives.iter() {
            if let ElementStatus::VolumeTag(ref tag) = drive_status.status {
                list.push(tag.clone());
            }
        }

        for slot_info in status.slots.iter() {
            if slot_info.import_export { continue; }
            if let ElementStatus::VolumeTag(ref tag) = slot_info.status {
                if tag.starts_with("CLN") { continue; }
                list.push(tag.clone());
            }
        }

        Ok(list)
    }

    /// Load/Unload cleaning cartridge
    ///
    /// This fail if there is no cleaning cartridge online. Any media
    /// inside the drive is automatically unloaded.
    fn clean_drive(&mut self) -> Result<(), Error> {
        let status = self.status()?;

        let mut cleaning_cartridge_slot = None;

        for (i, slot_info) in status.slots.iter().enumerate() {
            if slot_info.import_export { continue; }
            if let ElementStatus::VolumeTag(ref tag) = slot_info.status {
                if tag.starts_with("CLN") {
                    cleaning_cartridge_slot = Some(i + 1);
                    break;
                }
            }
        }

        let cleaning_cartridge_slot = match cleaning_cartridge_slot {
            None => bail!("clean failed - unable to find cleaning cartridge"),
            Some(cleaning_cartridge_slot) => cleaning_cartridge_slot as u64,
        };

        if let Some(drive_status) = status.drives.get(self.drive_number() as usize) {
            match drive_status.status {
                ElementStatus::Empty => { /* OK */ },
                _ => self.unload_to_free_slot(status)?,
            }
        }

        self.load_media_from_slot(cleaning_cartridge_slot)?;

        self.unload_media(Some(cleaning_cartridge_slot))?;

        Ok(())
    }

    /// Export media
    ///
    /// By moving the media to an empty import-export slot. Returns
    /// Some(slot) if the media was exported. Returns None if the media is
    /// not online (already exported).
    fn export_media(&mut self, label_text: &str) -> Result<Option<u64>, Error> {
        let status = self.status()?;

        let mut unload_from_drive = false;
        if let Some(drive_status) = status.drives.get(self.drive_number() as usize) {
            if let ElementStatus::VolumeTag(ref tag) = drive_status.status {
                if tag == label_text {
                    unload_from_drive = true;
                }
            }
        }

        let mut from = None;
        let mut to = None;

        for (i, slot_info) in status.slots.iter().enumerate() {
            if slot_info.import_export {
                if to.is_some() { continue; }
                if let ElementStatus::Empty = slot_info.status {
                    to = Some(i as u64 + 1);
                }
            } else if let ElementStatus::VolumeTag(ref tag) = slot_info.status {
                if tag == label_text {
                    from = Some(i as u64 + 1);
                }
            }
        }

        if unload_from_drive {
            match to {
                Some(to) => {
                    self.unload_media(Some(to))?;
                    Ok(Some(to))
                }
                None =>  bail!("unable to find free export slot"),
            }
        } else {
            match (from, to) {
                (Some(from), Some(to)) => {
                    self.transfer_media(from, to)?;
                    Ok(Some(to))
                }
                (Some(_from), None) => bail!("unable to find free export slot"),
                (None, _) => Ok(None), // not online
            }
        }
    }

    /// Unload media to a free storage slot
    ///
    /// If posible to the slot it was previously loaded from.
    ///
    /// Note: This method consumes status - so please read again afterward.
    fn unload_to_free_slot(&mut self, status: MtxStatus) -> Result<(), Error> {

        let drive_status = &status.drives[self.drive_number() as usize];
        if let Some(slot) = drive_status.loaded_slot {
            // check if original slot is empty/usable
            if let Some(info) = status.slots.get(slot as usize - 1) {
                if let ElementStatus::Empty = info.status {
                    return self.unload_media(Some(slot));
                }
            }
        }

        let mut free_slot = None;
        for i in 0..status.slots.len() {
            if status.slots[i].import_export { continue; } // skip import/export slots
            if let ElementStatus::Empty = status.slots[i].status {
                free_slot = Some((i+1) as u64);
                break;
            }
        }
        if let Some(slot) = free_slot {
            self.unload_media(Some(slot))
        } else {
            bail!("drive '{}' unload failure - no free slot", self.drive_name());
        }
    }
}

const USE_MTX: bool = false;

impl ScsiMediaChange for ScsiTapeChanger {

    fn status(&mut self)  -> Result<MtxStatus, Error> {
        if USE_MTX {
            mtx::mtx_status(&self)
        } else {
            let mut file = sg_pt_changer::open(&self.path)?;
            sg_pt_changer::read_element_status(&mut file)
        }
    }

    fn load_slot(&mut self, from_slot: u64, drivenum: u64) -> Result<(), Error> {
        if USE_MTX {
            mtx::mtx_load(&self.path, from_slot, drivenum)
        } else {
            let mut file = sg_pt_changer::open(&self.path)?;
            sg_pt_changer::load_slot(&mut file, from_slot, drivenum)
        }
    }

    fn unload(&mut self, to_slot: u64, drivenum: u64) -> Result<(), Error> {
        if USE_MTX {
            mtx::mtx_unload(&self.path, to_slot, drivenum)
        } else {
            let mut file = sg_pt_changer::open(&self.path)?;
            sg_pt_changer::unload(&mut file, to_slot, drivenum)
        }
    }

    fn transfer(&mut self, from_slot: u64, to_slot: u64) -> Result<(), Error> {
        if USE_MTX {
            mtx::mtx_transfer(&self.path, from_slot, to_slot)
        } else {
            let mut file = sg_pt_changer::open(&self.path)?;
            sg_pt_changer::transfer_medium(&mut file, from_slot, to_slot)
        }
    }
}

/// Implements MediaChange using 'mtx' linux cli tool
pub struct MtxMediaChanger {
    drive_name: String, // used for error messages
    drive_number: u64,
    config: ScsiTapeChanger,
}

impl MtxMediaChanger {

    pub fn with_drive_config(drive_config: &LinuxTapeDrive) -> Result<Self, Error> {
        let (config, _digest) = crate::config::drive::config()?;
        let changer_config: ScsiTapeChanger = match drive_config.changer {
            Some(ref changer) => config.lookup("changer", changer)?,
            None => bail!("drive '{}' has no associated changer", drive_config.name),
        };

        Ok(Self {
            drive_name: drive_config.name.clone(),
            drive_number: drive_config.changer_drive_id.unwrap_or(0),
            config: changer_config,
        })
    }
}

impl MediaChange for MtxMediaChanger {

    fn drive_number(&self) -> u64 {
        self.drive_number
    }

    fn drive_name(&self) -> &str {
        &self.drive_name
    }

    fn status(&mut self) -> Result<MtxStatus, Error> {
        self.config.status()
    }

    fn transfer_media(&mut self, from: u64, to: u64) -> Result<(), Error> {
        self.config.transfer(from, to)
    }

    fn load_media_from_slot(&mut self, slot: u64) -> Result<(), Error> {
        self.config.load_slot(slot, self.drive_number)
    }

    fn unload_media(&mut self, target_slot: Option<u64>) -> Result<(), Error> {
        if let Some(target_slot) = target_slot {
            self.config.unload(target_slot, self.drive_number)
        } else {
            let status = self.status()?;
            self.unload_to_free_slot(status)
        }
    }
}