thin-provisioning-tools/tests/common/cache_xml_generator.rs

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use anyhow::Result;
use rand::prelude::*;
use std::collections::HashSet;
use std::fs::OpenOptions;
use std::path::Path;
use thinp::cache::ir::{self, MetadataVisitor};
use thinp::cache::xml;
//------------------------------------------
pub trait XmlGen {
fn generate_xml(&mut self, v: &mut dyn MetadataVisitor) -> Result<()>;
}
pub fn write_xml(path: &Path, g: &mut dyn XmlGen) -> Result<()> {
let xml_out = OpenOptions::new()
.read(false)
.write(true)
.create(true)
.truncate(true)
.open(path)?;
let mut w = xml::XmlWriter::new(xml_out);
g.generate_xml(&mut w)
}
pub struct CacheGen {
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block_size: u32,
nr_cache_blocks: u32,
nr_origin_blocks: u64,
percent_resident: u8,
percent_dirty: u8,
}
impl CacheGen {
pub fn new(
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block_size: u32,
nr_cache_blocks: u32,
nr_origin_blocks: u64,
percent_resident: u8,
percent_dirty: u8,
) -> Self {
CacheGen {
block_size,
nr_cache_blocks,
nr_origin_blocks,
percent_resident,
percent_dirty,
}
}
}
impl XmlGen for CacheGen {
fn generate_xml(&mut self, v: &mut dyn MetadataVisitor) -> Result<()> {
v.superblock_b(&ir::Superblock {
uuid: "".to_string(),
block_size: self.block_size,
nr_cache_blocks: self.nr_cache_blocks,
policy: "smq".to_string(),
hint_width: 4,
})?;
let nr_resident = (self.nr_cache_blocks * self.percent_resident as u32) / 100u32;
let mut cblocks = (0..self.nr_cache_blocks).collect::<Vec<u32>>();
cblocks.shuffle(&mut rand::thread_rng());
cblocks.truncate(nr_resident as usize);
cblocks.sort();
v.mappings_b()?;
{
let mut used = HashSet::new();
let mut rng = rand::thread_rng();
for cblock in cblocks {
let mut oblock = 0u64;
while used.contains(&oblock) {
oblock = rng.gen_range(0..self.nr_origin_blocks);
}
used.insert(oblock);
// FIXME: dirty should vary
v.mapping(&ir::Map {
cblock,
oblock,
dirty: false,
})?;
}
}
v.mappings_e()?;
v.superblock_e()?;
Ok(())
}
}
//------------------------------------------