src/tools/disks/zpool_status.rs: parse zpool status output
This commit is contained in:
Dietmar Maurer
parent
2fd3d57490
commit
0727e56a06
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@ -23,6 +23,8 @@ use crate::api2::types::{BLOCKDEVICE_NAME_REGEX, StorageStatus};
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mod zfs;
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pub use zfs::*;
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mod zpool_status;
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pub use zpool_status::*;
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mod lvm;
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pub use lvm::*;
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mod smart;
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@ -0,0 +1,290 @@
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use anyhow::{bail, Error};
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use serde_json::{json, Value};
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use ::serde::{Deserialize, Serialize};
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use nom::{
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error::VerboseError,
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bytes::complete::{tag, take_while, take_while1},
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combinator::{map_res, all_consuming, recognize, opt},
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sequence::{preceded},
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character::complete::{digit1, line_ending},
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multi::{many0},
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};
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type IResult<I, O, E = VerboseError<I>> = Result<(I, O), nom::Err<E>>;
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/// Recognizes zero or more spaces and tabs (but not carage returns or line feeds)
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fn multispace0(i: &str) -> IResult<&str, &str> {
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take_while(|c| c == ' ' || c == '\t')(i)
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}
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// Recognizes one or more spaces and tabs (but not carage returns or line feeds)
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fn multispace1(i: &str) -> IResult<&str, &str> {
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take_while1(|c| c == ' ' || c == '\t')(i)
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}
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/// Recognizes one or more non-whitespace-characters
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fn notspace1(i: &str) -> IResult<&str, &str> {
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take_while1(|c| !(c == ' ' || c == '\t' || c == '\n'))(i)
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}
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fn parse_u64(i: &str) -> IResult<&str, u64> {
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map_res(recognize(digit1), str::parse)(i)
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}
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#[derive(Debug, Serialize, Deserialize)]
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pub struct ZFSPoolVDevState {
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pub name: String,
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pub lvl: u64,
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pub state: String,
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pub read: u64,
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pub write: u64,
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pub cksum: u64,
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#[serde(skip_serializing_if="Option::is_none")]
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pub msg: Option<String>,
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}
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fn parse_zpool_status_vdev(i: &str) -> IResult<&str, ZFSPoolVDevState> {
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let (i, indent) = multispace0(i)?;
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let (i, vdev_name) = notspace1(i)?;
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let (i, state) = preceded(multispace1, notspace1)(i)?;
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let (i, read) = preceded(multispace1, parse_u64)(i)?;
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let (i, write) = preceded(multispace1, parse_u64)(i)?;
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let (i, cksum) = preceded(multispace1, parse_u64)(i)?;
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let (i, msg) = opt(preceded(multispace1, take_while(|c| c != '\n')))(i)?;
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let (i, _) = line_ending(i)?;
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let vdev = ZFSPoolVDevState {
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name: vdev_name.to_string(),
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lvl: (indent.len() as u64)/2,
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state: state.to_string(),
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read, write, cksum,
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msg: msg.map(String::from),
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};
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Ok((i, vdev))
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}
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fn parse_zpool_status_tree(i: &str) -> IResult<&str, Vec<ZFSPoolVDevState>> {
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// skip header
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let (i, _) = tag("NAME")(i)?;
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let (i, _) = multispace1(i)?;
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let (i, _) = tag("STATE")(i)?;
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let (i, _) = multispace1(i)?;
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let (i, _) = tag("READ")(i)?;
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let (i, _) = multispace1(i)?;
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let (i, _) = tag("WRITE")(i)?;
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let (i, _) = multispace1(i)?;
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let (i, _) = tag("CKSUM")(i)?;
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let (i, _) = line_ending(i)?;
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// parse vdev list
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many0(parse_zpool_status_vdev)(i)
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}
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fn parse_zpool_status_field(i: &str) -> IResult<&str, (String, String)> {
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let (i, prefix) = take_while1(|c| c != ':')(i)?;
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let (i, _) = tag(":")(i)?;
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let (i, mut value) = take_while(|c| c != '\n')(i)?;
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if value.starts_with(' ') { value = &value[1..]; }
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let (mut i, _) = line_ending(i)?;
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let field = prefix.trim().to_string();
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let indent = (0..prefix.len()+2).fold(String::new(), |mut acc, _| { acc.push(' '); acc });
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let parse_continuation = opt(preceded(tag(indent.as_str()), take_while1(|c| c != '\n')));
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let mut value = value.to_string();
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if field == "config" {
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let (n, _) = line_ending(i)?;
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i = n;
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}
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loop {
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let (n, cont) = parse_continuation(i)?;
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if let Some(cont) = cont {
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let (n, _) = line_ending(n)?;
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i = n;
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if !value.is_empty() { value.push('\n'); }
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value.push_str(cont);
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} else {
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if field == "config" {
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let (n, _) = line_ending(i)?;
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value.push('\n');
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i = n;
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}
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break;
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}
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}
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Ok((i, (field, value)))
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}
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pub fn parse_zpool_status_config_tree(i: &str) -> Result<Vec<ZFSPoolVDevState>, Error> {
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match all_consuming(parse_zpool_status_tree)(&i) {
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Err(nom::Err::Error(err)) |
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Err(nom::Err::Failure(err)) => {
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bail!("unable to parse zfs status config tree - {}", nom::error::convert_error(&i, err));
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}
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Err(err) => {
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bail!("unable to parse zfs status config tree: {}", err);
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}
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Ok((_, data)) => Ok(data),
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}
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}
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fn parse_zpool_status(i: &str) -> Result<Vec<(String, String)>, Error> {
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match all_consuming(many0(parse_zpool_status_field))(i) {
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Err(nom::Err::Error(err)) |
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Err(nom::Err::Failure(err)) => {
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bail!("unable to parse zfs status output - {}", nom::error::convert_error(i, err));
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}
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Err(err) => {
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bail!("unable to parse zfs status output - {}", err);
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}
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Ok((_, data)) => Ok(data),
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}
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}
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pub fn vdev_list_to_tree(vdev_list: &[ZFSPoolVDevState]) -> Value {
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#[derive(Debug)]
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struct TreeNode<'a> {
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vdev: &'a ZFSPoolVDevState,
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children: Vec<usize>
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}
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fn node_to_json(node_idx: usize, nodes: &[TreeNode]) -> Value {
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let node = &nodes[node_idx];
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let mut v = serde_json::to_value(node.vdev).unwrap();
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if node.children.is_empty() {
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v["leaf"] = true.into();
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} else {
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v["leaf"] = false.into();
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v["children"] = json!([]);
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for child in node.children .iter(){
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let c = node_to_json(*child, nodes);
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v["children"].as_array_mut().unwrap().push(c);
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}
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}
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v
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}
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let mut nodes: Vec<TreeNode> = vdev_list.into_iter().map(|vdev| {
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TreeNode {
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vdev: vdev,
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children: Vec::new(),
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}
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}).collect();
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let mut stack: Vec<usize> = Vec::new();
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let mut root_children: Vec<usize> = Vec::new();
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for idx in 0..nodes.len() {
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if stack.is_empty() {
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root_children.push(idx);
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stack.push(idx);
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continue;
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}
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let node_lvl = nodes[idx].vdev.lvl;
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let stacked_node = &mut nodes[*(stack.last().unwrap())];
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let last_lvl = stacked_node.vdev.lvl;
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if node_lvl > last_lvl {
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stacked_node.children.push(idx);
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} else if node_lvl == last_lvl {
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stack.pop();
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match stack.last() {
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Some(parent) => nodes[*parent].children.push(idx),
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None => root_children.push(idx),
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}
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} else {
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loop {
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if stack.is_empty() {
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root_children.push(idx);
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break;
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}
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let stacked_node = &mut nodes[*(stack.last().unwrap())];
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if node_lvl <= stacked_node.vdev.lvl {
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stack.pop();
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} else {
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stacked_node.children.push(idx);
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break;
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}
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}
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}
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stack.push(idx);
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}
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let mut result = json!({
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"name": "root",
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"children": json!([]),
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});
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for child in root_children {
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let c = node_to_json(child, &nodes);
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result["children"].as_array_mut().unwrap().push(c);
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}
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result
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}
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pub fn zpool_status(pool: &str) -> Result<Vec<(String, String)>, Error> {
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let mut command = std::process::Command::new("zpool");
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command.args(&["status", "-p", "-P", pool]);
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let output = crate::tools::run_command(command, None)?;
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parse_zpool_status(&output)
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}
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#[test]
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fn test_zpool_status_parser() -> Result<(), Error> {
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let output = r###" pool: tank
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state: DEGRADED
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status: One or more devices could not be opened. Sufficient replicas exist for
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the pool to continue functioning in a degraded state.
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action: Attach the missing device and online it using 'zpool online'.
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see: http://www.sun.com/msg/ZFS-8000-2Q
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scrub: none requested
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config:
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NAME STATE READ WRITE CKSUM
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tank DEGRADED 0 0 0
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mirror-0 DEGRADED 0 0 0
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c1t0d0 ONLINE 0 0 0
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c1t2d0 ONLINE 0 0 0
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c1t1d0 UNAVAIL 0 0 0 cannot open
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mirror-1 DEGRADED 0 0 0
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tank1 DEGRADED 0 0 0
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tank2 DEGRADED 0 0 0
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errors: No known data errors
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"###;
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let key_value_list = parse_zpool_status(&output)?;
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for (k, v) in key_value_list {
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println!("{} => {}", k,v);
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if k == "config" {
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let vdev_list = parse_zpool_status_config_tree(&v)?;
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let tree = vdev_list_to_tree(&vdev_list);
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println!("TREE1 {}", serde_json::to_string_pretty(&tree)?);
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}
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}
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Ok(())
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}
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