181 lines
5.6 KiB
Rust
181 lines
5.6 KiB
Rust
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// Copyright 2018 Mozilla
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
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// this file except in compliance with the License. You may obtain a copy of the
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// License at http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed
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// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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// CONDITIONS OF ANY KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations under the License.
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extern crate mentat;
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use std::collections::{
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BTreeSet,
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};
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use std::os::raw::{
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c_char,
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c_int,
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};
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use std::slice;
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use std::sync::{
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Arc,
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};
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pub use mentat::{
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Entid,
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HasSchema,
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NamespacedKeyword,
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Store,
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Syncable,
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TxObserver,
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};
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pub use mentat::errors::{
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Result,
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};
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pub mod android;
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pub mod utils;
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pub use utils::strings::{
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c_char_to_string,
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string_to_c_char,
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str_to_c_char,
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};
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use utils::log;
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#[repr(C)]
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#[derive(Debug, Clone)]
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pub struct ExternTxReport {
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pub txid: Entid,
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pub changes: Box<[Entid]>,
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pub changes_len: usize,
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}
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#[repr(C)]
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#[derive(Debug)]
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pub struct ExternTxReportList {
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pub reports: Box<[ExternTxReport]>,
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pub len: usize,
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}
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#[repr(C)]
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pub struct ExternResult {
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pub error: *const c_char,
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}
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impl From<Result<()>> for ExternResult {
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fn from(result: Result<()>) -> Self {
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match result {
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Ok(_) => {
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ExternResult {
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error: std::ptr::null(),
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}
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},
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Err(e) => {
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ExternResult {
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error: string_to_c_char(e.description().into())
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}
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}
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}
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}
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}
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// A store cannot be opened twice to the same location.
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// Once created, the reference to the store is held by the caller and not Rust,
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// therefore the caller is responsible for calling `store_destroy` to release the memory
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// used by the Store in order to avoid a memory leak.
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// TODO: Start returning `ExternResult`s rather than crashing on error.
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#[no_mangle]
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pub extern "C" fn store_open(uri: *const c_char) -> *mut Store {
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let uri = c_char_to_string(uri);
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let store = Store::open(&uri).expect("expected a store");
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Box::into_raw(Box::new(store))
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}
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// Reclaim the memory for the provided Store and drop, therefore releasing it.
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#[no_mangle]
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pub unsafe extern "C" fn store_destroy(store: *mut Store) {
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let _ = Box::from_raw(store);
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}
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#[no_mangle]
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pub unsafe extern "C" fn store_register_observer(store: *mut Store,
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key: *const c_char,
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attributes: *const Entid,
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attributes_len: usize,
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callback: extern fn(key: *const c_char, reports: &ExternTxReportList)) {
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let store = &mut*store;
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let mut attribute_set = BTreeSet::new();
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let slice = slice::from_raw_parts(attributes, attributes_len);
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attribute_set.extend(slice.iter());
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let key = c_char_to_string(key);
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let tx_observer = Arc::new(TxObserver::new(attribute_set, move |obs_key, batch| {
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log::d(&format!("Calling observer registered for {:?}, batch: {:?}", obs_key, batch));
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let extern_reports: Vec<ExternTxReport> = batch.into_iter().map(|(tx_id, changes)| {
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let changes: Vec<Entid> = changes.into_iter().map(|i|*i).collect();
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let len = changes.len();
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ExternTxReport {
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txid: *tx_id,
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changes: changes.into_boxed_slice(),
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changes_len: len,
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}
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}).collect();
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let len = extern_reports.len();
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let reports = ExternTxReportList {
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reports: extern_reports.into_boxed_slice(),
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len: len,
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};
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callback(str_to_c_char(obs_key), &reports);
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}));
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store.register_observer(key, tx_observer);
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}
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#[no_mangle]
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pub unsafe extern "C" fn store_unregister_observer(store: *mut Store, key: *const c_char) {
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let store = &mut*store;
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let key = c_char_to_string(key);
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log::d(&format!("Unregistering observer for key: {:?}", key));
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store.unregister_observer(&key);
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}
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#[no_mangle]
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pub unsafe extern "C" fn store_entid_for_attribute(store: *mut Store, attr: *const c_char) -> Entid {
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let store = &mut*store;
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let mut keyword_string = c_char_to_string(attr);
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let attr_name = keyword_string.split_off(1);
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let parts: Vec<&str> = attr_name.split("/").collect();
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let kw = NamespacedKeyword::new(parts[0], parts[1]);
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let conn = store.conn();
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let current_schema = conn.current_schema();
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let got_entid = current_schema.get_entid(&kw);
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let entid = got_entid.unwrap();
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entid.into()
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}
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#[no_mangle]
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pub unsafe extern "C" fn tx_report_list_entry_at(tx_report_list: *mut ExternTxReportList, index: c_int) -> *const ExternTxReport {
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let tx_report_list = &*tx_report_list;
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let index = index as usize;
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let report = Box::new(tx_report_list.reports[index].clone());
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Box::into_raw(report)
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}
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#[no_mangle]
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pub unsafe extern "C" fn changelist_entry_at(tx_report: *mut ExternTxReport, index: c_int) -> Entid {
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let tx_report = &*tx_report;
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let index = index as usize;
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tx_report.changes[index].clone()
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}
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#[no_mangle]
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pub unsafe extern "C" fn store_sync(store: *mut Store, user_uuid: *const c_char, server_uri: *const c_char) -> *mut ExternResult {
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let store = &mut*store;
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let user_uuid = c_char_to_string(user_uuid);
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let server_uri = c_char_to_string(server_uri);
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let res = store.sync(&server_uri, &user_uuid);
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Box::into_raw(Box::new(res.into()))
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}
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