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//! Index statistics computation.
use crate::index::manifest::Manifest;
use crate::index::IndexSnapshot;
use crate::{Config, IndexStats};
/// Compute index statistics from the current snapshot and config.
pub fn compute_stats(snap: &IndexSnapshot, config: &Config, pending_edits: usize) -> IndexStats {
let total_docs: usize = snap
.base
.segments
.iter()
.map(|s| s.doc_count as usize)
.sum();
let total_grams: usize = snap
.base
.segments
.iter()
.map(|s| s.gram_count as usize)
.sum();
let manifest_size = config
.index_dir
.join("manifest.json")
.metadata()
.map(|m| m.len())
.unwrap_or(0);
let (seg_size, base_commit, overlay_generations) =
if let Ok(manifest) = Manifest::load(&config.index_dir) {
let seg_size = manifest
.segments
.iter()
.map(|sr| {
// v3: sum .dict + .post; v2: just .seg
let dict_size = if !sr.dict_filename.is_empty() {
config
.index_dir
.join(&sr.dict_filename)
.metadata()
.map(|m| m.len())
.unwrap_or(0)
} else {
0
};
let post_size = if !sr.post_filename.is_empty() {
config
.index_dir
.join(&sr.post_filename)
.metadata()
.map(|m| m.len())
.unwrap_or(0)
} else {
0
};
let seg_file_size = if !sr.filename.is_empty() {
config
.index_dir
.join(&sr.filename)
.metadata()
.map(|m| m.len())
.unwrap_or(0)
} else {
0
};
dict_size + post_size + seg_file_size
})
.sum();
(
seg_size,
manifest.base_commit,
manifest.overlay_gen as usize,
)
} else {
(0, None, 0)
};
IndexStats {
total_documents: total_docs,
total_segments: snap.base.segments.len(),
total_grams,
index_size_bytes: manifest_size + seg_size,
base_commit,
overlay_generations,
pending_edits,
}
}