support ingest external file (rust-rocksdb#77)

librocksdb_sys/src/lib.rs

@@ -35,6 +35,9 @@ pub enum DBWriteBatch {}
 pub enum DBComparator {}
 pub enum DBFlushOptions {}
 pub enum DBCompactionFilter {}
+pub enum EnvOptions {}
+pub enum SstFileWriter {}
+pub enum IngestExternalFileOptions {}
 pub enum DBBackupEngine {}
 pub enum DBRestoreOptions {}
 pub enum DBSliceTransform {}
@@ -509,6 +512,54 @@ extern "C" {
                                                           ignore_snapshot: bool);
     pub fn crocksdb_compactionfilter_destroy(filter: *mut DBCompactionFilter);
 
+    // EnvOptions
+    pub fn crocksdb_envoptions_create() -> *mut EnvOptions;
+    pub fn crocksdb_envoptions_destroy(opt: *mut EnvOptions);
+
+    // IngestExternalFileOptions
+    pub fn crocksdb_ingestexternalfileoptions_create() -> *mut IngestExternalFileOptions;
+    pub fn crocksdb_ingestexternalfileoptions_set_move_files(opt: *mut IngestExternalFileOptions,
+                                                             move_files: bool);
+    pub fn crocksdb_ingestexternalfileoptions_set_snapshot_consistency(
+        opt: *mut IngestExternalFileOptions, snapshot_consistency: bool);
+    pub fn crocksdb_ingestexternalfileoptions_set_allow_global_seqno(
+        opt: *mut IngestExternalFileOptions, allow_global_seqno: bool);
+    pub fn crocksdb_ingestexternalfileoptions_set_allow_blocking_flush(
+        opt: *mut IngestExternalFileOptions, allow_blocking_flush: bool);
+    pub fn crocksdb_ingestexternalfileoptions_destroy(opt: *mut IngestExternalFileOptions);
+
+    // SstFileWriter
+    pub fn crocksdb_sstfilewriter_create(env: *mut EnvOptions,
+                                         io_options: *const DBOptions)
+                                         -> *mut SstFileWriter;
+    pub fn crocksdb_sstfilewriter_create_with_comparator(env: *mut EnvOptions,
+                                                         io_options: *const DBOptions,
+                                                         comparator: *const DBComparator)
+                                                         -> *mut SstFileWriter;
+    pub fn crocksdb_sstfilewriter_open(writer: *mut SstFileWriter,
+                                       name: *const c_char,
+                                       err: *mut *mut c_char);
+    pub fn crocksdb_sstfilewriter_add(writer: *mut SstFileWriter,
+                                      key: *const u8,
+                                      key_len: size_t,
+                                      val: *const u8,
+                                      val_len: size_t,
+                                      err: *mut *mut c_char);
+    pub fn crocksdb_sstfilewriter_finish(writer: *mut SstFileWriter, err: *mut *mut c_char);
+    pub fn crocksdb_sstfilewriter_destroy(writer: *mut SstFileWriter);
+
+    pub fn crocksdb_ingest_external_file(db: *mut DBInstance,
+                                         file_list: *const *const c_char,
+                                         list_len: size_t,
+                                         opt: *const IngestExternalFileOptions,
+                                         err: *mut *mut c_char);
+    pub fn crocksdb_ingest_external_file_cf(db: *mut DBInstance,
+                                            handle: *const DBCFHandle,
+                                            file_list: *const *const c_char,
+                                            list_len: size_t,
+                                            opt: *const IngestExternalFileOptions,
+                                            err: *mut *mut c_char);
+
     // Restore Option
     pub fn crocksdb_restore_options_create() -> *mut DBRestoreOptions;
     pub fn crocksdb_restore_options_destroy(ropts: *mut DBRestoreOptions);
@@ -551,8 +602,8 @@ extern "C" {
 #[cfg(test)]
 mod test {
     use libc::{self, c_void};
+    use std::{ptr, slice, fs};
     use std::ffi::{CStr, CString};
-    use std::ptr;
     use super::*;
     use tempdir::TempDir;
 
@@ -635,4 +686,104 @@ mod test {
             assert!(err.is_null());
         }
     }
+
+    unsafe fn check_get(db: *mut DBInstance,
+                        opt: *const DBReadOptions,
+                        key: &[u8],
+                        val: Option<&[u8]>) {
+        let mut val_len = 0;
+        let mut err = ptr::null_mut();
+        let res_ptr = crocksdb_get(db, opt, key.as_ptr(), key.len(), &mut val_len, &mut err);
+        assert!(err.is_null());
+        let res = if res_ptr.is_null() {
+            None
+        } else {
+            Some(slice::from_raw_parts(res_ptr, val_len))
+        };
+        assert_eq!(res, val);
+        if !res_ptr.is_null() {
+            libc::free(res_ptr as *mut libc::c_void);
+        }
+    }
+
+    #[test]
+    fn test_ingest_external_file() {
+        unsafe {
+            let opts = crocksdb_options_create();
+            crocksdb_options_set_create_if_missing(opts, true);
+
+            let rustpath = TempDir::new("_rust_rocksdb_internaltest").expect("");
+            let cpath = CString::new(rustpath.path().to_str().unwrap()).unwrap();
+            let cpath_ptr = cpath.as_ptr();
+
+            let mut err = ptr::null_mut();
+            let db = crocksdb_open(opts, cpath_ptr, &mut err);
+            assert!(err.is_null(), error_message(err));
+
+            let env_opt = crocksdb_envoptions_create();
+            let io_options = crocksdb_options_create();
+            let writer = crocksdb_sstfilewriter_create(env_opt, io_options);
+
+            let sst_dir = TempDir::new("_rust_rocksdb_internaltest").expect("");
+            let sst_path = sst_dir.path().join("sstfilename");
+            let c_sst_path = CString::new(sst_path.to_str().unwrap()).unwrap();
+            let c_sst_path_ptr = c_sst_path.as_ptr();
+
+            crocksdb_sstfilewriter_open(writer, c_sst_path_ptr, &mut err);
+            assert!(err.is_null(), error_message(err));
+            crocksdb_sstfilewriter_add(writer, b"sstk1".as_ptr(), 5, b"v1".as_ptr(), 2, &mut err);
+            assert!(err.is_null(), error_message(err));
+            crocksdb_sstfilewriter_add(writer, b"sstk2".as_ptr(), 5, b"v2".as_ptr(), 2, &mut err);
+            assert!(err.is_null(), error_message(err));
+            crocksdb_sstfilewriter_add(writer, b"sstk3".as_ptr(), 5, b"v3".as_ptr(), 2, &mut err);
+            assert!(err.is_null(), error_message(err));
+            crocksdb_sstfilewriter_finish(writer, &mut err);
+            assert!(err.is_null(), error_message(err));
+
+            let ing_opt = crocksdb_ingestexternalfileoptions_create();
+            let file_list = &[c_sst_path_ptr];
+            crocksdb_ingest_external_file(db, file_list.as_ptr(), 1, ing_opt, &mut err);
+            assert!(err.is_null(), error_message(err));
+            let roptions = crocksdb_readoptions_create();
+            check_get(db, roptions, b"sstk1", Some(b"v1"));
+            check_get(db, roptions, b"sstk2", Some(b"v2"));
+            check_get(db, roptions, b"sstk3", Some(b"v3"));
+
+            let snap = crocksdb_create_snapshot(db);
+
+            fs::remove_file(sst_path).unwrap();
+            crocksdb_sstfilewriter_open(writer, c_sst_path_ptr, &mut err);
+            assert!(err.is_null(), error_message(err));
+            crocksdb_sstfilewriter_add(writer, "sstk2".as_ptr(), 5, "v4".as_ptr(), 2, &mut err);
+            assert!(err.is_null(), error_message(err));
+            crocksdb_sstfilewriter_add(writer, "sstk22".as_ptr(), 6, "v5".as_ptr(), 2, &mut err);
+            assert!(err.is_null(), error_message(err));
+            crocksdb_sstfilewriter_add(writer, "sstk3".as_ptr(), 5, "v6".as_ptr(), 2, &mut err);
+            assert!(err.is_null(), error_message(err));
+            crocksdb_sstfilewriter_finish(writer, &mut err);
+            assert!(err.is_null(), error_message(err));
+
+            crocksdb_ingest_external_file(db, file_list.as_ptr(), 1, ing_opt, &mut err);
+            assert!(err.is_null(), error_message(err));
+            check_get(db, roptions, b"sstk1", Some(b"v1"));
+            check_get(db, roptions, b"sstk2", Some(b"v4"));
+            check_get(db, roptions, b"sstk22", Some(b"v5"));
+            check_get(db, roptions, b"sstk3", Some(b"v6"));
+
+            let roptions2 = crocksdb_readoptions_create();
+            crocksdb_readoptions_set_snapshot(roptions2, snap);
+            check_get(db, roptions2, b"sstk1", Some(b"v1"));
+            check_get(db, roptions2, b"sstk2", Some(b"v2"));
+            check_get(db, roptions2, b"sstk22", None);
+            check_get(db, roptions2, b"sstk3", Some(b"v3"));
+            crocksdb_readoptions_destroy(roptions2);
+
+            crocksdb_readoptions_destroy(roptions);
+            crocksdb_release_snapshot(db, snap);
+            crocksdb_ingestexternalfileoptions_destroy(ing_opt);
+            crocksdb_sstfilewriter_destroy(writer);
+            crocksdb_options_destroy(io_options);
+            crocksdb_envoptions_destroy(env_opt);
+        }
+    }
 }

src/external_file.rs

@@ -0,0 +1,69 @@
+// Copyright 2016 PingCAP, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use librocksdb_sys;
+use rocksdb_options::{Options, EnvOptions};
+
+use std::ffi::CString;
+
+/// SstFileWriter is used to create sst files that can be added to database later
+/// All keys in files generated by SstFileWriter will have sequence number = 0
+pub struct SstFileWriter {
+    inner: *mut librocksdb_sys::SstFileWriter,
+}
+
+impl SstFileWriter {
+    pub fn new(env_opt: &EnvOptions, opt: &Options) -> SstFileWriter {
+        unsafe {
+            SstFileWriter {
+                inner: librocksdb_sys::crocksdb_sstfilewriter_create(env_opt.inner, opt.inner),
+            }
+        }
+    }
+
+    /// Prepare SstFileWriter to write into file located at "file_path".
+    pub fn open(&mut self, name: &str) -> Result<(), String> {
+        let path = match CString::new(name.to_owned()) {
+            Err(e) => return Err(format!("invalid path {}: {:?}", name, e)),
+            Ok(p) => p,
+        };
+        unsafe { Ok(ffi_try!(crocksdb_sstfilewriter_open(self.inner, path.as_ptr()))) }
+    }
+
+    /// Add key, value to currently opened file
+    /// REQUIRES: key is after any previously added key according to comparator.
+    pub fn add(&mut self, key: &[u8], val: &[u8]) -> Result<(), String> {
+        unsafe {
+            ffi_try!(crocksdb_sstfilewriter_add(self.inner,
+                                                key.as_ptr(),
+                                                key.len(),
+                                                val.as_ptr(),
+                                                val.len()));
+            Ok(())
+        }
+    }
+
+    /// Finalize writing to sst file and close file.
+    pub fn finish(&mut self) -> Result<(), String> {
+        unsafe {
+            ffi_try!(crocksdb_sstfilewriter_finish(self.inner));
+            Ok(())
+        }
+    }
+}
+
+impl Drop for SstFileWriter {
+    fn drop(&mut self) {
+        unsafe { librocksdb_sys::crocksdb_sstfilewriter_destroy(self.inner) }
+    }
+}

src/lib.rs

@@ -25,13 +25,16 @@ pub mod rocksdb_options;
 pub mod merge_operator;
 pub mod comparator;
 mod compaction_filter;
+mod external_file;
 mod slice_transform;
 
 pub use compaction_filter::CompactionFilter;
+pub use external_file::SstFileWriter;
 pub use librocksdb_sys::{DBCompactionStyle, DBCompressionType, DBRecoveryMode, new_bloom_filter,
                          self as crocksdb_ffi};
 pub use merge_operator::MergeOperands;
 pub use rocksdb::{DB, DBIterator, DBVector, Kv, SeekKey, Writable, WriteBatch, CFHandle, Range,
                   BackupEngine};
-pub use rocksdb_options::{BlockBasedOptions, Options, ReadOptions, WriteOptions, RestoreOptions};
+pub use rocksdb_options::{BlockBasedOptions, Options, ReadOptions, WriteOptions, RestoreOptions,
+                          IngestExternalFileOptions, EnvOptions};
 pub use slice_transform::SliceTransform;

src/rocksdb.rs

@@ -15,15 +15,15 @@
 
 use crocksdb_ffi::{self, DBWriteBatch, DBCFHandle, DBInstance, DBBackupEngine};
 use libc::{self, c_int, c_void, size_t};
-use rocksdb_options::{Options, ReadOptions, UnsafeSnap, WriteOptions, FlushOptions, RestoreOptions};
+use rocksdb_options::{Options, ReadOptions, UnsafeSnap, WriteOptions, FlushOptions,
+                      RestoreOptions, IngestExternalFileOptions};
+use std::{fs, ptr, slice};
 use std::collections::BTreeMap;
 use std::collections::btree_map::Entry;
 use std::ffi::{CStr, CString};
-use std::fs;
+use std::fmt::{self, Debug, Formatter};
 use std::ops::Deref;
 use std::path::Path;
-use std::ptr;
-use std::slice;
 use std::str::from_utf8;
 
 const DEFAULT_COLUMN_FAMILY: &'static str = "default";
@@ -40,6 +40,10 @@ impl Drop for CFHandle {
     }
 }
 
+fn build_cstring_list(str_list: &[&str]) -> Vec<CString> {
+    str_list.into_iter().map(|s| CString::new(s.as_bytes()).unwrap()).collect()
+}
+
 pub struct DB {
     inner: *mut DBInstance,
     cfs: BTreeMap<String, CFHandle>,
@@ -323,9 +327,7 @@ impl DB {
 
             // We need to store our CStrings in an intermediate vector
             // so that their pointers remain valid.
-            let c_cfs: Vec<CString> = cfs_v.iter()
-                .map(|cf| CString::new(cf.as_bytes()).unwrap())
-                .collect();
+            let c_cfs = build_cstring_list(&cfs_v);
 
             let cfnames: Vec<*const _> = c_cfs.iter()
                 .map(|cf| cf.as_ptr())
@@ -855,6 +857,42 @@ impl DB {
         self.opts.get_statistics()
     }
 
+    pub fn get_options(&self) -> &Options {
+        &self.opts
+    }
+
+    pub fn ingest_external_file(&self,
+                                opt: &IngestExternalFileOptions,
+                                files: &[&str])
+                                -> Result<(), String> {
+        let c_files = build_cstring_list(files);
+        let c_files_ptrs: Vec<*const _> = c_files.iter().map(|s| s.as_ptr()).collect();
+        unsafe {
+            ffi_try!(crocksdb_ingest_external_file(self.inner,
+                                                   c_files_ptrs.as_ptr(),
+                                                   c_files.len(),
+                                                   opt.inner));
+        }
+        Ok(())
+    }
+
+    pub fn ingest_external_file_cf(&self,
+                                   cf: &CFHandle,
+                                   opt: &IngestExternalFileOptions,
+                                   files: &[&str])
+                                   -> Result<(), String> {
+        let c_files = build_cstring_list(files);
+        let c_files_ptrs: Vec<*const _> = c_files.iter().map(|s| s.as_ptr()).collect();
+        unsafe {
+            ffi_try!(crocksdb_ingest_external_file_cf(self.inner,
+                                                      cf.inner,
+                                                      c_files_ptrs.as_ptr(),
+                                                      c_files_ptrs.len(),
+                                                      opt.inner));
+        }
+        Ok(())
+    }
+
     pub fn backup_at(&self, path: &str) -> Result<BackupEngine, String> {
         let backup_engine = BackupEngine::open(Options::new(), path).unwrap();
         unsafe {
@@ -1067,6 +1105,29 @@ pub struct DBVector {
     len: usize,
 }
 
+impl Debug for DBVector {
+    fn fmt(&self, formatter: &mut Formatter) -> fmt::Result {
+        unsafe {
+            write!(formatter,
+                   "{:?}",
+                   slice::from_raw_parts(self.base, self.len))
+        }
+    }
+}
+
+impl<'a> PartialEq<&'a [u8]> for DBVector {
+    fn eq(&self, rhs: &&[u8]) -> bool {
+        if self.len != rhs.len() {
+            return false;
+        }
+        unsafe {
+            libc::memcmp(self.base as *mut c_void,
+                         rhs.as_ptr() as *mut c_void,
+                         self.len) == 0
+        }
+    }
+}
+
 impl Deref for DBVector {
     type Target = [u8];
     fn deref(&self) -> &[u8] {