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//! Backup generations metadata.
use crate::schema::{SchemaVersion, VersionComponent};
use serde::Serialize;
use std::collections::HashMap;
/// Metadata about the local generation.
#[derive(Debug, Serialize)]
pub struct GenerationMeta {
schema_version: SchemaVersion,
extras: HashMap<String, String>,
}
impl GenerationMeta {
/// Create from a hash map.
pub fn from(mut map: HashMap<String, String>) -> Result<Self, GenerationMetaError> {
let major: VersionComponent = metaint(&mut map, "schema_version_major")?;
let minor: VersionComponent = metaint(&mut map, "schema_version_minor")?;
Ok(Self {
schema_version: SchemaVersion::new(major, minor),
extras: map,
})
}
/// Return schema version of local generation.
pub fn schema_version(&self) -> SchemaVersion {
self.schema_version
}
/// Get a value corresponding to a key in the meta table.
pub fn get(&self, key: &str) -> Option<&String> {
self.extras.get(key)
}
}
fn metastr(map: &mut HashMap<String, String>, key: &str) -> Result<String, GenerationMetaError> {
if let Some(v) = map.remove(key) {
Ok(v)
} else {
Err(GenerationMetaError::NoMetaKey(key.to_string()))
}
}
fn metaint(map: &mut HashMap<String, String>, key: &str) -> Result<u32, GenerationMetaError> {
let v = metastr(map, key)?;
let v = v
.parse()
.map_err(|err| GenerationMetaError::BadMetaInteger(key.to_string(), err))?;
Ok(v)
}
/// Possible errors from getting generation metadata.
#[derive(Debug, thiserror::Error)]
pub enum GenerationMetaError {
/// Missing from from 'meta' table.
#[error("Generation 'meta' table does not have a row {0}")]
NoMetaKey(String),
/// Bad data in 'meta' table.
#[error("Generation 'meta' row {0} has badly formed integer: {1}")]
BadMetaInteger(String, std::num::ParseIntError),
}
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