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|
//! `GET /admin/changes[/<path>]`: who wrote what, newest first, of the whole document
//! or of what is at a path (as `/store/<path>` names it). Every change names the node that
//! committed it (its author) and, for a write through the API, the user who wrote it (in
//! its message, `User:`), with when (its writer's clock) and the store paths it touched
//! (`document::replica::Writer`). Every node holds every change, so any node answers
//! for the whole swarm, as far as it has synced.
use axum::{
Json,
extract::{Path, Query, State},
http::StatusCode,
};
use serde::{Deserialize, Serialize};
use crate::document::store::{self, InLists};
use crate::state::AppState;
/// Changes listed at most.
const MAX_LIMIT: usize = 1000;
/// Changes looked at at most, newest first, for those touching `path`: each costs
/// decoding it, under the document's read lock (`store::changed_by`).
const MAX_SCANNED: usize = 10_000;
#[derive(Debug, Deserialize)]
pub(crate) struct ChangesQuery {
/// How many, at most (100 by default, up to `MAX_LIMIT`).
limit: Option<usize>,
}
#[derive(Debug, Serialize)]
#[serde(rename_all = "camelCase")]
pub(crate) struct ChangeReport {
hash: String,
/// When, by its writer's clock (Unix milliseconds); 0 for a remake's snapshot.
at: i64,
/// The node that made it (its node ID), if it says.
#[serde(skip_serializing_if = "Option::is_none")]
node: Option<String>,
/// The user it was written for through the API, if any.
#[serde(skip_serializing_if = "Option::is_none")]
user: Option<String>,
/// The store paths it touched (a list's items by index).
paths: Vec<String>,
}
#[derive(Debug, Serialize)]
#[serde(rename_all = "camelCase")]
pub(crate) struct ChangesReport {
changes: Vec<ChangeReport>,
/// Older ones weren't looked at (`MAX_SCANNED`, or `limit` reached).
more: bool,
}
/// `GET /admin/changes`: all of them.
pub(crate) async fn get_changes(
State(state): State<AppState>,
Query(query): Query<ChangesQuery>,
) -> Result<Json<ChangesReport>, StatusCode> {
report(state, query, None).await
}
/// `GET /admin/changes/{key}`: those that touched what is at the path, inside it, or
/// above it.
pub(crate) async fn get_changes_at(
State(state): State<AppState>,
Path(key): Path<String>,
Query(query): Query<ChangesQuery>,
) -> Result<Json<ChangesReport>, StatusCode> {
let segments: Vec<String> = key.split('/').map(str::to_owned).collect();
if segments.iter().any(String::is_empty) {
return Err(StatusCode::BAD_REQUEST);
}
report(state, query, Some(segments)).await
}
async fn report(
state: AppState,
query: ChangesQuery,
path: Option<Vec<String>>,
) -> Result<Json<ChangesReport>, StatusCode> {
if !state.is_ready().await {
return Err(StatusCode::SERVICE_UNAVAILABLE);
}
let limit = query.limit.unwrap_or(100).clamp(1, MAX_LIMIT);
Ok(Json(
state
.render(
move |doc| changes(doc, limit, path.as_deref()),
|report| report,
)
.await,
))
}
fn changes(
doc: &crate::document::Document,
limit: usize,
path: Option<&[String]>,
) -> ChangesReport {
let all = doc.get_changes_meta(&[]);
let mut changes = Vec::new();
let mut scanned = 0;
let mut more = false;
for meta in all.iter().rev() {
if changes.len() == limit || scanned == MAX_SCANNED {
more = true;
break;
}
scanned += 1;
// What this change did, from its operations.
let paths = store::changed_by(doc, &meta.hash, InLists::Index).unwrap_or_default();
if let Some(path) = path
&& !paths
.iter()
.any(|touched| touched.starts_with(path) || path.starts_with(touched))
{
continue;
}
changes.push(ChangeReport {
hash: meta.hash.to_string(),
at: meta.timestamp,
node: meta
.author
.as_ref()
.and_then(|author| String::from_utf8(author.as_bytes().to_vec()).ok()),
user: meta
.message
.as_deref()
.and_then(crate::document::replica::user_of)
.map(str::to_owned),
paths: paths.iter().map(|path| path.join("/")).collect(),
});
}
ChangesReport { changes, more }
}
|
