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|
//! Logging for the backend.
// XXX: Implement log levels and trim the log.
use rusqlite::{Connection, types::ToSql};
use super::{
ID, Timestamp, Rc, Result, node,
MappingServer, BindingServer, KeyServer,
Promise, capnp, capnp_rpc
};
/// Models entries referring to other objects.
pub struct Refers {
mapping: Option<ID>,
binding: Option<ID>,
key: Option<ID>,
}
impl Refers {
/// Builds an empty object.
pub fn to() -> Self {
Refers{mapping: None, binding: None, key: None}
}
/// Makes log refer a mapping.
pub fn mapping(mut self, id: ID) -> Self {
self.mapping = Some(id);
self
}
/// Makes log refer a binding.
pub fn binding(mut self, id: ID) -> Self {
self.binding = Some(id);
self
}
/// Makes log refer a key.
pub fn key(mut self, id: ID) -> Self {
self.key = Some(id);
self
}
}
/// Writes a log message to the log.
pub fn message(c: &Rc<Connection>, refers: Refers,
slug: &str, message: &str)
-> Result<ID> {
log(c, refers, slug, message, None)
}
/// Writes an error message to the log.
pub fn error(c: &Rc<Connection>, refers: Refers,
slug: &str, message: &str, error: &str)
-> Result<ID> {
log(c, refers, slug, message, Some(error))
}
/// Writes a log message to the log.
fn log(c: &Rc<Connection>, refers: Refers,
slug: &str, message: &str, error: Option<&str>)
-> Result<ID> {
c.execute("INSERT INTO log
(timestamp, level, mapping, binding, key, slug, message, error)
VALUES (?1, 0, ?2, ?3, ?4, ?5, ?6, ?7)",
&[&Timestamp::now() as &dyn ToSql,
&refers.mapping, &refers.binding, &refers.key,
&slug, &message, &error])?;
Ok(c.last_insert_rowid().into())
}
/// Selects log entries to iterate over.
pub enum Selector {
All,
Mapping(ID),
Binding(ID),
Key(ID),
}
/// Iterator for log entries.
pub struct IterServer {
c: Rc<Connection>,
selector: Selector,
n: ID,
}
impl IterServer {
pub fn new(c: Rc<Connection>, selector: Selector) -> Self {
IterServer{c: c, selector: selector, n: ID::max()}
}
}
impl node::log_iter::Server for IterServer {
fn next(&mut self,
_: node::log_iter::NextParams,
mut results: node::log_iter::NextResults)
-> Promise<(), capnp::Error> {
bind_results!(results);
let (
id, timestamp,
mapping, binding, key,
slug, message, error
): (
ID, Timestamp,
Option<ID>, Option<ID>, Option<ID>,
String, String, Option<String>
) = sry!(match self.selector {
Selector::All =>
self.c.query_row(
"SELECT id, timestamp,
mapping, binding, key,
slug, message, error
FROM log
WHERE id < ?1
ORDER BY id DESC LIMIT 1",
&[&self.n],
|row| Ok((row.get(0)?, row.get(1)?,
row.get(2)?, row.get(3)?, row.get(4)?,
row.get(5)?, row.get(6)?, row.get(7)?))),
Selector::Mapping(mapping) =>
self.c.query_row(
"SELECT id, timestamp,
mapping, binding, key,
slug, message, error
FROM log
WHERE id < ?1
AND (mapping = ?2
OR binding IN (SELECT id FROM bindings WHERE mapping = ?2)
OR key IN (SELECT key FROM bindings WHERE mapping = ?2))
ORDER BY id DESC LIMIT 1",
&[&self.n, &mapping],
|row| Ok((row.get(0)?, row.get(1)?,
row.get(2)?, row.get(3)?, row.get(4)?,
row.get(5)?, row.get(6)?, row.get(7)?))),
Selector::Binding(binding) =>
self.c.query_row(
"SELECT id, timestamp,
mapping, binding, key,
slug, message, error
FROM log
WHERE id < ?1
AND (binding = ?2
OR key IN (SELECT key FROM bindings WHERE id = ?2))
ORDER BY id DESC LIMIT 1",
&[&self.n, &binding],
|row| Ok((row.get(0)?, row.get(1)?,
row.get(2)?, row.get(3)?, row.get(4)?,
row.get(5)?, row.get(6)?, row.get(7)?))),
Selector::Key(key) =>
self.c.query_row(
"SELECT id, timestamp,
mapping, binding, key,
slug, message, error
FROM log
WHERE id < ?1
AND key = ?2
ORDER BY id DESC LIMIT 1",
&[&self.n, &key],
|row| Ok((row.get(0)?, row.get(1)?,
row.get(2)?, row.get(3)?, row.get(4)?,
row.get(5)?, row.get(6)?, row.get(7)?))),
});
let mut entry = pry!(results.get().get_result()).init_ok();
entry.set_timestamp(timestamp.unix());
if let Some(mapping) = mapping {
entry.set_mapping(node::mapping::ToClient::new(
MappingServer::new(self.c.clone(), mapping))
.into_client::<capnp_rpc::Server>());
}
if let Some(binding) = binding {
entry.set_binding(node::binding::ToClient::new(
BindingServer::new(self.c.clone(), binding))
.into_client::<capnp_rpc::Server>());
}
if let Some(key) = key {
entry.set_key(node::key::ToClient::new(
KeyServer::new(self.c.clone(), key))
.into_client::<capnp_rpc::Server>());
}
entry.set_slug(&slug);
entry.set_message(&message);
if let Some(error) = error {
entry.set_error(&error);
}
self.n = id;
Promise::ok(())
}
}
|
