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//! `DbContextOptions` and `DbContextOptionsBuilder` — provider factory and
//! context-level configuration.
use crate::error::EFResult;
use crate::provider::IDatabaseProvider;
use std::sync::Arc;
#[derive(Clone)]
pub struct DbContextOptions {
pub(crate) connection_string: String,
pub(crate) provider_tag: Option<String>,
#[allow(clippy::type_complexity)]
pub(crate) provider_factory:
Option<Arc<dyn Fn(&str) -> EFResult<Arc<dyn IDatabaseProvider>> + Send + Sync>>,
/// Process-level cache of the built provider (which owns the connection
/// pool). Built once on the first `create_provider()` call and shared
/// across every `DbContext` created from the same `Arc<DbContextOptions>`
/// (i.e. the same `add_dbcontext` registration). Keeping the provider
/// alive for the application lifetime means the connection pool is reused
/// across requests instead of being recreated per request.
pub(crate) provider_cache: Arc<std::sync::Mutex<Option<Arc<dyn IDatabaseProvider>>>>,
pub(crate) interceptors: Vec<Arc<dyn crate::interceptor::ISaveChangesInterceptor>>,
/// When `true`, `QueryBuilder::to_list()` attaches `LazyContext` to every
/// navigation container on materialized entities, enabling on-demand
/// loading via `BelongsTo::load()` / `HasMany::load()` / `HasOne::load()`.
///
/// Defaults to `false` (opt-in) to preserve v1.0 eager-only behavior.
pub(crate) lazy_loading_enabled: bool,
pub(crate) context_key: Option<String>,
/// Process-level cache of `discover_entities()` output, keyed by
/// `context_key`. Shared across all `DbContext` instances created from
/// the same `DbContextOptions` (which is `Arc`-shared per `add_dbcontext`
/// registration). The first `from_options()` call builds the metadata;
/// subsequent calls `Arc::clone` it.
pub(crate) metadata_cache: Arc<crate::metadata_cache::MetadataCache>,
/// Slow query threshold for tracing. When set, queries exceeding this
/// duration emit a `tracing::warn!` event.
#[cfg(feature = "tracing")]
pub(crate) slow_query_threshold: Option<std::time::Duration>,
}
impl std::fmt::Debug for DbContextOptions {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_struct("DbContextOptions")
.field(
"connection_string",
&redact_connection_string(&self.connection_string),
)
.field("provider_tag", &self.provider_tag)
.finish()
}
}
/// Redacts credentials from a connection string so `Debug` output never leaks
/// passwords. Handles URL form (`scheme://user:pass@host`) and key=value form
/// (`...;Password=...;...`). SQLite file paths and other credential-free
/// strings are returned unchanged for debuggability.
fn redact_connection_string(cs: &str) -> String {
// URL form: scheme://[user[:pass]@]host...
if let Some(scheme_end) = cs.find("://") {
let (scheme, rest) = cs.split_at(scheme_end + 3);
if let Some(at) = rest.find('@') {
let (userinfo, host_and_rest) = rest.split_at(at);
let redacted_user = match userinfo.find(':') {
Some(colon) => &userinfo[..colon],
None => userinfo,
};
return format!("{}{}***@{}", scheme, redacted_user, &host_and_rest[1..]);
}
return cs.to_string();
}
// Key=value form: redact any token whose key mentions password/pwd.
if cs.contains('=') {
return cs
.split(';')
.map(|pair| {
let eq = match pair.find('=') {
Some(e) => e,
None => return pair.to_string(),
};
let key = pair[..eq].trim().to_lowercase();
if key.contains("password") || key.contains("pwd") {
format!("{}=***", &pair[..eq])
} else {
pair.to_string()
}
})
.collect::<Vec<_>>()
.join(";");
}
cs.to_string()
}
impl DbContextOptions {
pub fn connection_string(&self) -> &str {
&self.connection_string
}
pub fn provider_tag(&self) -> Option<&str> {
self.provider_tag.as_deref()
}
pub fn lazy_loading_enabled(&self) -> bool {
self.lazy_loading_enabled
}
pub fn context_key(&self) -> Option<&str> {
self.context_key.as_deref()
}
pub fn create_provider(&self) -> EFResult<Arc<dyn IDatabaseProvider>> {
// Recover from a poisoned lock rather than panicking (consistent with
// `MetadataCache`): if a previous build panicked, `into_inner()` yields
// the still-`None` cache and we retry the build below.
let mut guard = self
.provider_cache
.lock()
.unwrap_or_else(|p| p.into_inner());
if let Some(provider) = guard.as_ref() {
return Ok(Arc::clone(provider));
}
let factory = self.provider_factory.as_ref().ok_or_else(|| {
crate::error::EFError::configuration(
"No provider configured. Call use_sqlite / use_postgres / use_mysql first.",
)
})?;
let provider = factory(self.connection_string())?;
#[cfg(feature = "tracing")]
if let Some(threshold) = self.slow_query_threshold {
provider.set_slow_query_threshold(threshold);
}
*guard = Some(Arc::clone(&provider));
Ok(provider)
}
}
#[allow(clippy::derivable_impls)]
impl Default for DbContextOptions {
fn default() -> Self {
Self {
connection_string: String::new(),
provider_tag: None,
provider_factory: None,
provider_cache: Arc::new(std::sync::Mutex::new(None)),
interceptors: Vec::new(),
lazy_loading_enabled: false,
context_key: None,
metadata_cache: Arc::new(crate::metadata_cache::MetadataCache::new()),
#[cfg(feature = "tracing")]
slow_query_threshold: None,
}
}
}
pub struct DbContextOptionsBuilder {
inner: DbContextOptions,
}
impl DbContextOptionsBuilder {
pub fn new() -> Self {
Self {
inner: DbContextOptions::default(),
}
}
pub fn connection_string(&mut self, cs: impl Into<String>) -> &mut Self {
self.inner.connection_string = cs.into();
self
}
pub fn set_provider(&mut self, tag: &str, cs: impl Into<String>) -> &mut Self {
self.inner.provider_tag = Some(tag.to_string());
self.inner.connection_string = cs.into();
self
}
#[allow(clippy::type_complexity)]
pub fn set_provider_factory(
&mut self,
tag: &str,
cs: impl Into<String>,
factory: Arc<dyn Fn(&str) -> EFResult<Arc<dyn IDatabaseProvider>> + Send + Sync>,
) -> &mut Self {
self.inner.provider_tag = Some(tag.to_string());
self.inner.connection_string = cs.into();
self.inner.provider_factory = Some(factory);
self
}
/// Registers a `SaveChanges` interceptor.
///
/// Interceptors are called in registration order during
/// `save_changes()`. Use this for auditing, soft-delete,
/// validation, and other cross-cutting concerns.
///
/// # Example
///
/// ```rust,ignore
/// options
/// .use_sqlite("app.db")
/// .add_interceptor(AuditInterceptor::new());
/// ```
pub fn add_interceptor(
&mut self,
interceptor: impl crate::interceptor::ISaveChangesInterceptor + 'static,
) -> &mut Self {
self.inner.interceptors.push(Arc::new(interceptor));
self
}
/// Enables or disables lazy loading of navigation properties.
///
/// When enabled (`true`), `to_list()` attaches a `LazyContext` to every
/// navigation container on each materialized entity. The user can then
/// call `nav.load().await` to trigger a single-entity query on first
/// access; subsequent accesses read from the in-memory cache.
///
/// When disabled (`false`, the default), navigation properties are
/// empty unless explicitly loaded via `Include` — matching v1.0
/// eager-only behavior.
///
/// # Example
///
/// ```rust,ignore
/// let mut options = DbContextOptionsBuilder::new();
/// options.use_sqlite_in_memory().use_lazy_loading(true);
/// ```
pub fn use_lazy_loading(&mut self, enabled: bool) -> &mut Self {
self.inner.lazy_loading_enabled = enabled;
self
}
/// Sets the context key used to filter entities and configurations
/// during `DbContext::discover_entities()`. Set automatically by
/// `add_dbcontext_keyed`; `None` (the default) selects the default
/// context.
pub fn context_key(&mut self, key: impl Into<String>) -> &mut Self {
self.inner.context_key = Some(key.into());
self
}
/// Sets the slow query threshold. Queries exceeding this duration
/// emit a `tracing::warn!` event with SQL and elapsed time.
///
/// Only available when the `tracing` feature is enabled.
#[cfg(feature = "tracing")]
pub fn slow_query_threshold(&mut self, threshold: std::time::Duration) -> &mut Self {
self.inner.slow_query_threshold = Some(threshold);
self
}
pub fn build(self) -> DbContextOptions {
self.inner
}
}
impl Default for DbContextOptionsBuilder {
fn default() -> Self {
Self::new()
}
}