From 021ee9c32be65c298de20adb021ba6066e674200 Mon Sep 17 00:00:00 2001 From: "gabor@google.com" Date: Fri, 5 Aug 2011 20:40:49 +0000 Subject: [PATCH] C binding for leveldb, better readseq benchmark for SQLite. - Added a C binding for LevelDB. May be useful as a stable ABI that can be used by programs that keep leveldb in a shared library, or for JNI API. - Replaced SQLite's readseq benchmark to a more efficient version. SQLite readseq speeds increased by about a factor of 2x from the previous version. Also updated benchmark page to reflect readseq speed up. git-svn-id: https://leveldb.googlecode.com/svn/trunk@46 62dab493-f737-651d-591e-8d6aee1b9529 --- Makefile | 16 ++ db/c.cc | 453 ++++++++++++++++++++++++++++++++++++++++++ db/c_test.c | 295 +++++++++++++++++++++++++++ doc/bench/db_bench_sqlite3.cc | 26 ++- doc/benchmark.html | 14 +- include/leveldb/c.h | 246 +++++++++++++++++++++++ include/leveldb/db.h | 1 + 7 files changed, 1036 insertions(+), 15 deletions(-) create mode 100644 db/c.cc create mode 100644 db/c_test.c create mode 100644 include/leveldb/c.h diff --git a/Makefile b/Makefile index d198d9d..86e24e8 100644 --- a/Makefile +++ b/Makefile @@ -42,6 +42,7 @@ LDFLAGS=$(PLATFORM_LDFLAGS) $(SNAPPY_LDFLAGS) $(GOOGLE_PERFTOOLS_LDFLAGS) LIBOBJECTS = \ ./db/builder.o \ + ./db/c.o \ ./db/db_impl.o \ ./db/db_iter.o \ ./db/filename.o \ @@ -81,6 +82,7 @@ TESTHARNESS = ./util/testharness.o $(TESTUTIL) TESTS = \ arena_test \ + c_test \ cache_test \ coding_test \ corruption_test \ @@ -127,6 +129,9 @@ db_bench_tree_db: doc/bench/db_bench_tree_db.o $(LIBOBJECTS) $(TESTUTIL) arena_test: util/arena_test.o $(LIBOBJECTS) $(TESTHARNESS) $(CC) $(LDFLAGS) util/arena_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ +c_test: db/c_test.o $(LIBOBJECTS) $(TESTHARNESS) + $(CC) $(LDFLAGS) db/c_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ + cache_test: util/cache_test.o $(LIBOBJECTS) $(TESTHARNESS) $(CC) $(LDFLAGS) util/cache_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ @@ -182,8 +187,19 @@ IOSVERSION=$(shell defaults read /Developer/Platforms/iPhoneOS.platform/version mkdir -p ios-arm/$(dir $@) $(DEVICEROOT)/usr/bin/$(CC) $(CFLAGS) -isysroot $(DEVICEROOT)/SDKs/iPhoneOS$(IOSVERSION).sdk -arch armv6 -arch armv7 $< -o ios-arm/$@ lipo ios-x86/$@ ios-arm/$@ -create -output $@ + +.c.o: + mkdir -p ios-x86/$(dir $@) + $(SIMULATORROOT)/usr/bin/$(CC) $(CFLAGS) -isysroot $(SIMULATORROOT)/SDKs/iPhoneSimulator$(IOSVERSION).sdk -arch i686 $< -o ios-x86/$@ + mkdir -p ios-arm/$(dir $@) + $(DEVICEROOT)/usr/bin/$(CC) $(CFLAGS) -isysroot $(DEVICEROOT)/SDKs/iPhoneOS$(IOSVERSION).sdk -arch armv6 -arch armv7 $< -o ios-arm/$@ + lipo ios-x86/$@ ios-arm/$@ -create -output $@ + else .cc.o: $(CC) $(CFLAGS) $< -o $@ + +.c.o: + $(CC) $(CFLAGS) $< -o $@ endif diff --git a/db/c.cc b/db/c.cc new file mode 100644 index 0000000..ee8a472 --- /dev/null +++ b/db/c.cc @@ -0,0 +1,453 @@ +// Copyright (c) 2011 The LevelDB Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +#include "leveldb/c.h" + +#include +#include +#include "leveldb/cache.h" +#include "leveldb/comparator.h" +#include "leveldb/db.h" +#include "leveldb/env.h" +#include "leveldb/iterator.h" +#include "leveldb/options.h" +#include "leveldb/status.h" +#include "leveldb/write_batch.h" + +namespace leveldb { + +extern "C" { + +struct leveldb_t { DB* rep; }; +struct leveldb_iterator_t { Iterator* rep; }; +struct leveldb_writebatch_t { WriteBatch rep; }; +struct leveldb_snapshot_t { const Snapshot* rep; }; +struct leveldb_readoptions_t { ReadOptions rep; }; +struct leveldb_writeoptions_t { WriteOptions rep; }; +struct leveldb_options_t { Options rep; }; +struct leveldb_cache_t { Cache* rep; }; +struct leveldb_seqfile_t { SequentialFile* rep; }; +struct leveldb_randomfile_t { RandomAccessFile* rep; }; +struct leveldb_writablefile_t { WritableFile* rep; }; +struct leveldb_logger_t { Logger* rep; }; +struct leveldb_filelock_t { FileLock* rep; }; + +struct leveldb_comparator_t : public Comparator { + void* state_; + void (*destructor_)(void*); + int (*compare_)( + void*, + const char* a, size_t alen, + const char* b, size_t blen); + const char* (*name_)(void*); + + virtual ~leveldb_comparator_t() { + (*destructor_)(state_); + } + + virtual int Compare(const Slice& a, const Slice& b) const { + return (*compare_)(state_, a.data(), a.size(), b.data(), b.size()); + } + + virtual const char* Name() const { + return (*name_)(state_); + } + + // No-ops since the C binding does not support key shortening methods. + virtual void FindShortestSeparator(std::string*, const Slice&) const { } + virtual void FindShortSuccessor(std::string* key) const { } +}; + +struct leveldb_env_t { + Env* rep; + bool is_default; +}; + +static bool SaveError(char** errptr, const Status& s) { + assert(errptr != NULL); + if (s.ok()) { + return false; + } else if (*errptr == NULL) { + *errptr = strdup(s.ToString().c_str()); + } else { + // TODO(sanjay): Merge with existing error? + free(*errptr); + *errptr = strdup(s.ToString().c_str()); + } + return true; +} + +static char* CopyString(const std::string& str) { + char* result = reinterpret_cast(malloc(sizeof(char) * str.size())); + memcpy(result, str.data(), sizeof(char) * str.size()); + return result; +} + +leveldb_t* leveldb_open( + const leveldb_options_t* options, + const char* name, + char** errptr) { + DB* db; + if (SaveError(errptr, DB::Open(options->rep, std::string(name), &db))) { + return NULL; + } + leveldb_t* result = new leveldb_t; + result->rep = db; + return result; +} + +void leveldb_close(leveldb_t* db) { + delete db->rep; + delete db; +} + +void leveldb_put( + leveldb_t* db, + const leveldb_writeoptions_t* options, + const char* key, size_t keylen, + const char* val, size_t vallen, + char** errptr) { + SaveError(errptr, + db->rep->Put(options->rep, Slice(key, keylen), Slice(val, vallen))); +} + +void leveldb_delete( + leveldb_t* db, + const leveldb_writeoptions_t* options, + const char* key, size_t keylen, + char** errptr) { + SaveError(errptr, db->rep->Delete(options->rep, Slice(key, keylen))); +} + + +void leveldb_write( + leveldb_t* db, + const leveldb_writeoptions_t* options, + leveldb_writebatch_t* batch, + char** errptr) { + SaveError(errptr, db->rep->Write(options->rep, &batch->rep)); +} + +char* leveldb_get( + leveldb_t* db, + const leveldb_readoptions_t* options, + const char* key, size_t keylen, + size_t* vallen, + char** errptr) { + char* result = NULL; + std::string tmp; + Status s = db->rep->Get(options->rep, Slice(key, keylen), &tmp); + if (s.ok()) { + *vallen = tmp.size(); + result = CopyString(tmp); + } else { + *vallen = 0; + if (!s.IsNotFound()) { + SaveError(errptr, s); + } + } + return result; +} + +leveldb_iterator_t* leveldb_create_iterator( + leveldb_t* db, + const leveldb_readoptions_t* options) { + leveldb_iterator_t* result = new leveldb_iterator_t; + result->rep = db->rep->NewIterator(options->rep); + return result; +} + +const leveldb_snapshot_t* leveldb_create_snapshot( + leveldb_t* db) { + leveldb_snapshot_t* result = new leveldb_snapshot_t; + result->rep = db->rep->GetSnapshot(); + return result; +} + +void leveldb_release_snapshot( + leveldb_t* db, + const leveldb_snapshot_t* snapshot) { + db->rep->ReleaseSnapshot(snapshot->rep); + delete snapshot; +} + +const char* leveldb_property_value( + leveldb_t* db, + const char* propname) { + std::string tmp; + if (db->rep->GetProperty(Slice(propname), &tmp)) { + return CopyString(tmp); + } else { + return NULL; + } +} + +void leveldb_approximate_sizes( + leveldb_t* db, + int num_ranges, + const char* const* range_start_key, const size_t* range_start_key_len, + const char* const* range_limit_key, const size_t* range_limit_key_len, + uint64_t* sizes) { + Range* ranges = new Range[num_ranges]; + for (int i = 0; i < num_ranges; i++) { + ranges[i].start = Slice(range_start_key[i], range_start_key_len[i]); + ranges[i].limit = Slice(range_limit_key[i], range_limit_key_len[i]); + } + db->rep->GetApproximateSizes(ranges, num_ranges, sizes); + delete[] ranges; +} + +void leveldb_destroy_db( + const leveldb_options_t* options, + const char* name, + char** errptr) { + SaveError(errptr, DestroyDB(name, options->rep)); +} + +void leveldb_repair_db( + const leveldb_options_t* options, + const char* name, + char** errptr) { + SaveError(errptr, RepairDB(name, options->rep)); +} + +void leveldb_iter_destroy(leveldb_iterator_t* iter) { + delete iter->rep; + delete iter; +} + +unsigned char leveldb_iter_valid(const leveldb_iterator_t* iter) { + return iter->rep->Valid(); +} + +void leveldb_iter_seek_to_first(leveldb_iterator_t* iter) { + iter->rep->SeekToFirst(); +} + +void leveldb_iter_seek_to_last(leveldb_iterator_t* iter) { + iter->rep->SeekToLast(); +} + +void leveldb_iter_seek(leveldb_iterator_t* iter, const char* k, size_t klen) { + iter->rep->Seek(Slice(k, klen)); +} + +void leveldb_iter_next(leveldb_iterator_t* iter) { + iter->rep->Next(); +} + +void leveldb_iter_prev(leveldb_iterator_t* iter) { + iter->rep->Prev(); +} + +const char* leveldb_iter_key(const leveldb_iterator_t* iter, size_t* klen) { + Slice s = iter->rep->key(); + *klen = s.size(); + return s.data(); +} + +const char* leveldb_iter_value(const leveldb_iterator_t* iter, size_t* vlen) { + Slice s = iter->rep->value(); + *vlen = s.size(); + return s.data(); +} + +void leveldb_iter_get_error(const leveldb_iterator_t* iter, char** errptr) { + SaveError(errptr, iter->rep->status()); +} + +leveldb_writebatch_t* leveldb_writebatch_create() { + return new leveldb_writebatch_t; +} + +void leveldb_writebatch_destroy(leveldb_writebatch_t* b) { + delete b; +} + +void leveldb_writebatch_clear(leveldb_writebatch_t* b) { + b->rep.Clear(); +} + +void leveldb_writebatch_put( + leveldb_writebatch_t* b, + const char* key, size_t klen, + const char* val, size_t vlen) { + b->rep.Put(Slice(key, klen), Slice(val, vlen)); +} + +void leveldb_writebatch_delete( + leveldb_writebatch_t* b, + const char* key, size_t klen) { + b->rep.Delete(Slice(key, klen)); +} + +void leveldb_writebatch_iterate( + leveldb_writebatch_t* b, + void* state, + void (*put)(void*, const char* k, size_t klen, const char* v, size_t vlen), + void (*deleted)(void*, const char* k, size_t klen)) { + class H : public WriteBatch::Handler { + public: + void* state_; + void (*put_)(void*, const char* k, size_t klen, const char* v, size_t vlen); + void (*deleted_)(void*, const char* k, size_t klen); + virtual void Put(const Slice& key, const Slice& value) { + (*put_)(state_, key.data(), key.size(), value.data(), value.size()); + } + virtual void Delete(const Slice& key) { + (*deleted_)(state_, key.data(), key.size()); + } + }; + H handler; + handler.state_ = state; + handler.put_ = put; + handler.deleted_ = deleted; + b->rep.Iterate(&handler); +} + +leveldb_options_t* leveldb_options_create() { + return new leveldb_options_t; +} + +void leveldb_options_destroy(leveldb_options_t* options) { + delete options; +} + +void leveldb_options_set_comparator( + leveldb_options_t* opt, + leveldb_comparator_t* cmp) { + opt->rep.comparator = cmp; +} + +void leveldb_options_set_create_if_missing( + leveldb_options_t* opt, unsigned char v) { + opt->rep.create_if_missing = v; +} + +void leveldb_options_set_error_if_exists( + leveldb_options_t* opt, unsigned char v) { + opt->rep.error_if_exists = v; +} + +void leveldb_options_set_paranoid_checks( + leveldb_options_t* opt, unsigned char v) { + opt->rep.paranoid_checks = v; +} + +void leveldb_options_set_env(leveldb_options_t* opt, leveldb_env_t* env) { + opt->rep.env = (env ? env->rep : NULL); +} + +void leveldb_options_set_info_log(leveldb_options_t* opt, leveldb_logger_t* l) { + opt->rep.info_log = (l ? l->rep : NULL); +} + +void leveldb_options_set_write_buffer_size(leveldb_options_t* opt, size_t s) { + opt->rep.write_buffer_size = s; +} + +void leveldb_options_set_max_open_files(leveldb_options_t* opt, int n) { + opt->rep.max_open_files = n; +} + +void leveldb_options_set_cache(leveldb_options_t* opt, leveldb_cache_t* c) { + opt->rep.block_cache = c->rep; +} + +void leveldb_options_set_block_size(leveldb_options_t* opt, size_t s) { + opt->rep.block_size = s; +} + +void leveldb_options_set_block_restart_interval(leveldb_options_t* opt, int n) { + opt->rep.block_restart_interval = n; +} + +void leveldb_options_set_compression(leveldb_options_t* opt, int t) { + opt->rep.compression = static_cast(t); +} + +leveldb_comparator_t* leveldb_comparator_create( + void* state, + void (*destructor)(void*), + int (*compare)( + void*, + const char* a, size_t alen, + const char* b, size_t blen), + const char* (*name)(void*)) { + leveldb_comparator_t* result = new leveldb_comparator_t; + result->state_ = state; + result->destructor_ = destructor; + result->compare_ = compare; + result->name_ = name; + return result; +} + +void leveldb_comparator_destroy(leveldb_comparator_t* cmp) { + delete cmp; +} + +leveldb_readoptions_t* leveldb_readoptions_create() { + return new leveldb_readoptions_t; +} + +void leveldb_readoptions_destroy(leveldb_readoptions_t* opt) { + delete opt; +} + +void leveldb_readoptions_set_verify_checksums( + leveldb_readoptions_t* opt, + unsigned char v) { + opt->rep.verify_checksums = v; +} + +void leveldb_readoptions_set_fill_cache( + leveldb_readoptions_t* opt, unsigned char v) { + opt->rep.fill_cache = v; +} + +void leveldb_readoptions_set_snapshot( + leveldb_readoptions_t* opt, + const leveldb_snapshot_t* snap) { + opt->rep.snapshot = (snap ? snap->rep : NULL); +} + +leveldb_writeoptions_t* leveldb_writeoptions_create() { + return new leveldb_writeoptions_t; +} + +void leveldb_writeoptions_destroy(leveldb_writeoptions_t* opt) { + delete opt; +} + +void leveldb_writeoptions_set_sync( + leveldb_writeoptions_t* opt, unsigned char v) { + opt->rep.sync = v; +} + +leveldb_cache_t* leveldb_cache_create_lru(size_t capacity) { + leveldb_cache_t* c = new leveldb_cache_t; + c->rep = NewLRUCache(capacity); + return c; +} + +void leveldb_cache_destroy(leveldb_cache_t* cache) { + delete cache->rep; + delete cache; +} + +leveldb_env_t* leveldb_create_default_env() { + leveldb_env_t* result = new leveldb_env_t; + result->rep = Env::Default(); + result->is_default = true; + return result; +} + +void leveldb_env_destroy(leveldb_env_t* env) { + if (!env->is_default) delete env->rep; + delete env; +} + +} // end extern "C" + +} diff --git a/db/c_test.c b/db/c_test.c new file mode 100644 index 0000000..9fef325 --- /dev/null +++ b/db/c_test.c @@ -0,0 +1,295 @@ +/* Copyright (c) 2011 The LevelDB Authors. All rights reserved. + Use of this source code is governed by a BSD-style license that can be + found in the LICENSE file. See the AUTHORS file for names of contributors. */ + +#include "leveldb/c.h" + +#include +#include +#include +#include +#include +#include + +const char* phase = ""; +static char dbname[200]; + +static void StartPhase(const char* name) { + fprintf(stderr, "=== Test %s\n", name); + phase = name; +} + +#define CheckNoError(err) \ + if ((err) != NULL) { \ + fprintf(stderr, "%s:%d: %s: %s\n", __FILE__, __LINE__, phase, (err)); \ + abort(); \ + } + +#define CheckCondition(cond) \ + if (!(cond)) { \ + fprintf(stderr, "%s:%d: %s: %s\n", __FILE__, __LINE__, phase, #cond); \ + abort(); \ + } + +static void CheckEqual(const char* expected, const char* v, size_t n) { + if (expected == NULL && v == NULL) { + // ok + } else if (expected != NULL && v != NULL && n == strlen(expected) && + memcmp(expected, v, n) == 0) { + // ok + return; + } else { + fprintf(stderr, "%s: expected '%s', got '%s'\n", + phase, + (expected ? expected : "(null)"), + (v ? v : "(null")); + abort(); + } +} + +static void Free(char** ptr) { + if (*ptr) { + free(*ptr); + *ptr = NULL; + } +} + +static void CheckGet( + leveldb_t* db, + const leveldb_readoptions_t* options, + const char* key, + const char* expected) { + char* err = NULL; + size_t val_len; + char* val; + val = leveldb_get(db, options, key, strlen(key), &val_len, &err); + CheckNoError(err); + CheckEqual(expected, val, val_len); + Free(&val); +} + +static void CheckIter(leveldb_iterator_t* iter, + const char* key, const char* val) { + size_t len; + const char* str; + str = leveldb_iter_key(iter, &len); + CheckEqual(key, str, len); + str = leveldb_iter_value(iter, &len); + CheckEqual(val, str, len); +} + +// Callback from leveldb_writebatch_iterate() +static void CheckPut(void* ptr, + const char* k, size_t klen, + const char* v, size_t vlen) { + int* state = (int*) ptr; + CheckCondition(*state < 2); + switch (*state) { + case 0: + CheckEqual("bar", k, klen); + CheckEqual("b", v, vlen); + break; + case 1: + CheckEqual("box", k, klen); + CheckEqual("c", v, vlen); + break; + } + (*state)++; +} + +// Callback from leveldb_writebatch_iterate() +static void CheckDel(void* ptr, const char* k, size_t klen) { + int* state = (int*) ptr; + CheckCondition(*state == 2); + CheckEqual("bar", k, klen); + (*state)++; +} + +static void CmpDestroy(void* arg) { } + +static int CmpCompare(void* arg, const char* a, size_t alen, + const char* b, size_t blen) { + int n = (alen < blen) ? alen : blen; + int r = memcmp(a, b, n); + if (r == 0) { + if (alen < blen) r = -1; + else if (alen > blen) r = +1; + } + return r; +} + +static const char* CmpName(void* arg) { + return "foo"; +} + +int main(int argc, char** argv) { + leveldb_t* db; + leveldb_comparator_t* cmp; + leveldb_cache_t* cache; + leveldb_env_t* env; + leveldb_options_t* options; + leveldb_readoptions_t* roptions; + leveldb_writeoptions_t* woptions; + char* err = NULL; + + snprintf(dbname, sizeof(dbname), "/tmp/leveldb_c_test-%d", + ((int) geteuid())); + + StartPhase("create_objects"); + cmp = leveldb_comparator_create(NULL, CmpDestroy, CmpCompare, CmpName); + env = leveldb_create_default_env(); + cache = leveldb_cache_create_lru(100000); + + options = leveldb_options_create(); + leveldb_options_set_comparator(options, cmp); + leveldb_options_set_error_if_exists(options, 1); + leveldb_options_set_cache(options, cache); + leveldb_options_set_env(options, env); + leveldb_options_set_info_log(options, NULL); + leveldb_options_set_write_buffer_size(options, 100000); + leveldb_options_set_paranoid_checks(options, 1); + leveldb_options_set_max_open_files(options, 10); + leveldb_options_set_block_size(options, 1024); + leveldb_options_set_block_restart_interval(options, 8); + leveldb_options_set_compression(options, leveldb_no_compression); + + roptions = leveldb_readoptions_create(); + leveldb_readoptions_set_verify_checksums(roptions, 1); + leveldb_readoptions_set_fill_cache(roptions, 0); + + woptions = leveldb_writeoptions_create(); + leveldb_writeoptions_set_sync(woptions, 1); + + StartPhase("destroy"); + leveldb_destroy_db(options, dbname, &err); + Free(&err); + + StartPhase("open_error"); + db = leveldb_open(options, dbname, &err); + CheckCondition(err != NULL); + Free(&err); + + StartPhase("open"); + leveldb_options_set_create_if_missing(options, 1); + db = leveldb_open(options, dbname, &err); + CheckNoError(err); + CheckGet(db, roptions, "foo", NULL); + + StartPhase("put"); + leveldb_put(db, woptions, "foo", 3, "hello", 5, &err); + CheckNoError(err); + CheckGet(db, roptions, "foo", "hello"); + + StartPhase("writebatch"); + { + leveldb_writebatch_t* wb = leveldb_writebatch_create(); + leveldb_writebatch_put(wb, "foo", 3, "a", 1); + leveldb_writebatch_clear(wb); + leveldb_writebatch_put(wb, "bar", 3, "b", 1); + leveldb_writebatch_put(wb, "box", 3, "c", 1); + leveldb_writebatch_delete(wb, "bar", 3); + leveldb_write(db, woptions, wb, &err); + CheckNoError(err); + CheckGet(db, roptions, "foo", "hello"); + CheckGet(db, roptions, "bar", NULL); + CheckGet(db, roptions, "box", "c"); + int pos = 0; + leveldb_writebatch_iterate(wb, &pos, CheckPut, CheckDel); + CheckCondition(pos == 3); + leveldb_writebatch_destroy(wb); + } + + StartPhase("iter"); + { + leveldb_iterator_t* iter = leveldb_create_iterator(db, roptions); + CheckCondition(!leveldb_iter_valid(iter)); + leveldb_iter_seek_to_first(iter); + CheckCondition(leveldb_iter_valid(iter)); + CheckIter(iter, "box", "c"); + leveldb_iter_next(iter); + CheckIter(iter, "foo", "hello"); + leveldb_iter_prev(iter); + CheckIter(iter, "box", "c"); + leveldb_iter_prev(iter); + CheckCondition(!leveldb_iter_valid(iter)); + leveldb_iter_seek_to_last(iter); + CheckIter(iter, "foo", "hello"); + leveldb_iter_seek(iter, "b", 1); + CheckIter(iter, "box", "c"); + leveldb_iter_get_error(iter, &err); + CheckNoError(err); + leveldb_iter_destroy(iter); + } + + StartPhase("approximate_sizes"); + { + int i; + int n = 20000; + char keybuf[100]; + char valbuf[100]; + uint64_t sizes[2]; + const char* start[2] = { "a", "k00000000000000010000" }; + size_t start_len[2] = { 1, 21 }; + const char* limit[2] = { "k00000000000000010000", "z" }; + size_t limit_len[2] = { 21, 1 }; + leveldb_writeoptions_set_sync(woptions, 0); + for (i = 0; i < n; i++) { + snprintf(keybuf, sizeof(keybuf), "k%020d", i); + snprintf(valbuf, sizeof(valbuf), "v%020d", i); + leveldb_put(db, woptions, keybuf, strlen(keybuf), valbuf, strlen(valbuf), + &err); + CheckNoError(err); + } + leveldb_approximate_sizes(db, 2, start, start_len, limit, limit_len, sizes); + CheckCondition(sizes[0] > 0); + CheckCondition(sizes[1] > 0); + } + + StartPhase("property"); + { + char* prop = leveldb_property_value(db, "nosuchprop"); + CheckCondition(prop == NULL); + prop = leveldb_property_value(db, "leveldb.stats"); + CheckCondition(prop != NULL); + Free(&prop); + } + + StartPhase("snapshot"); + { + const leveldb_snapshot_t* snap; + snap = leveldb_create_snapshot(db); + leveldb_delete(db, woptions, "foo", 3, &err); + CheckNoError(err); + leveldb_readoptions_set_snapshot(roptions, snap); + CheckGet(db, roptions, "foo", "hello"); + leveldb_readoptions_set_snapshot(roptions, NULL); + CheckGet(db, roptions, "foo", NULL); + leveldb_release_snapshot(db, snap); + } + + StartPhase("repair"); + { + leveldb_close(db); + leveldb_options_set_create_if_missing(options, 0); + leveldb_options_set_error_if_exists(options, 0); + leveldb_repair_db(options, dbname, &err); + CheckNoError(err); + db = leveldb_open(options, dbname, &err); + CheckNoError(err); + CheckGet(db, roptions, "foo", NULL); + CheckGet(db, roptions, "bar", NULL); + CheckGet(db, roptions, "box", "c"); + } + + StartPhase("cleanup"); + leveldb_close(db); + leveldb_options_destroy(options); + leveldb_readoptions_destroy(roptions); + leveldb_writeoptions_destroy(woptions); + leveldb_cache_destroy(cache); + leveldb_comparator_destroy(cmp); + leveldb_env_destroy(env); + + fprintf(stderr, "PASS\n"); + return 0; +} diff --git a/doc/bench/db_bench_sqlite3.cc b/doc/bench/db_bench_sqlite3.cc index a15510e..e11db52 100644 --- a/doc/bench/db_bench_sqlite3.cc +++ b/doc/bench/db_bench_sqlite3.cc @@ -23,7 +23,6 @@ // fillseq100K -- write N/1000 100K values in sequential order in async mode // readseq -- read N times sequentially // readrandom -- read N times in random order -// readseq100K -- read N/1000 100K values in sequential order in async mode // readrand100K -- read N/1000 100K values in sequential order in async mode static const char* FLAGS_benchmarks = "fillseq," @@ -38,7 +37,7 @@ static const char* FLAGS_benchmarks = "readseq," "fillrand100K," "fillseq100K," - "readseq100K," + "readseq," "readrand100K," ; @@ -387,7 +386,7 @@ class Benchmark { Write(write_sync, SEQUENTIAL, FRESH, num_ / 1000, 100 * 1000, 1); WalCheckpoint(db_); } else if (name == Slice("readseq")) { - Read(SEQUENTIAL, 1); + ReadSequential(); } else if (name == Slice("readrandom")) { Read(RANDOM, 1); } else if (name == Slice("readrand100K")) { @@ -395,11 +394,6 @@ class Benchmark { reads_ /= 1000; Read(RANDOM, 1); reads_ = n; - } else if (name == Slice("readseq100K")) { - int n = reads_; - reads_ /= 1000; - Read(SEQUENTIAL, 1); - reads_ = n; } else { known = false; if (name != Slice()) { // No error message for empty name @@ -640,6 +634,22 @@ class Benchmark { ErrorCheck(status); } + void ReadSequential() { + int status; + sqlite3_stmt *pStmt; + std::string read_str = "SELECT * FROM test ORDER BY key"; + + status = sqlite3_prepare_v2(db_, read_str.c_str(), -1, &pStmt, NULL); + ErrorCheck(status); + for (int i = 0; i < reads_ && SQLITE_ROW == sqlite3_step(pStmt); i++) { + bytes_ += sqlite3_column_bytes(pStmt, 1) + sqlite3_column_bytes(pStmt, 2); + FinishedSingleOp(); + } + + status = sqlite3_finalize(pStmt); + ErrorCheck(status); + } + }; } diff --git a/doc/benchmark.html b/doc/benchmark.html index a0d6b02..c463977 100644 --- a/doc/benchmark.html +++ b/doc/benchmark.html @@ -130,8 +130,8 @@ parameters are varied. For the baseline:

1,010,000 ops/sec
 
SQLite3 - 174,000 ops/sec -
 
+ 383,000 ops/sec +
 

B. Random Reads

@@ -386,9 +386,9 @@ MB.

- - - + + +
 
 (1.06x baseline)
SQLite3210,000 ops/sec
 
(1.20x baseline)
609,000 ops/sec
 
(1.59x baseline)

Random Reads

@@ -425,8 +425,8 @@ database.

 
(3.60x baseline) SQLite3 - 174,000 ops/sec -
 
+ 383,000 ops/sec +
 
(1.00x baseline)

Random Reads

diff --git a/include/leveldb/c.h b/include/leveldb/c.h new file mode 100644 index 0000000..0be993d --- /dev/null +++ b/include/leveldb/c.h @@ -0,0 +1,246 @@ +/* Copyright (c) 2011 The LevelDB Authors. All rights reserved. + Use of this source code is governed by a BSD-style license that can be + found in the LICENSE file. See the AUTHORS file for names of contributors. + + C bindings for leveldb. May be useful as a stable ABI that can be + used by programs that keep leveldb in a shared library, or for + a JNI api. + + Does not support: + . getters for the option types + . custom comparators that implement key shortening + . capturing post-write-snapshot + . custom iter, db, env, cache implementations using just the C bindings + + Some conventions: + + (1) We expose just opaque struct pointers and functions to clients. + This allows us to change internal representations without having to + recompile clients. + + (2) For simplicity, there is no equivalent to the Slice type. Instead, + the caller has to pass the pointer and length as separate + arguments. + + (3) Errors are represented by a null-terminated c string. NULL + means no error. All operations that can raise an error are passed + a "char** errptr" as the last argument. One of the following must + be true on entry: + *errptr == NULL + *errptr points to a malloc()ed null-terminated error message + On success, a leveldb routine leaves *errptr unchanged. + On failure, leveldb frees the old value of *errptr and + set *errptr to a malloc()ed error message. + + (4) Bools have the type unsigned char (0 == false; rest == true) + + (5) All of the pointer arguments must be non-NULL. +*/ + +#ifndef STORAGE_LEVELDB_INCLUDE_C_H_ +#define STORAGE_LEVELDB_INCLUDE_C_H_ + +#ifdef __cplusplus +extern "C" { +#endif + +#include +#include +#include + +/* Exported types */ + +typedef struct leveldb_t leveldb_t; +typedef struct leveldb_cache_t leveldb_cache_t; +typedef struct leveldb_comparator_t leveldb_comparator_t; +typedef struct leveldb_env_t leveldb_env_t; +typedef struct leveldb_filelock_t leveldb_filelock_t; +typedef struct leveldb_iterator_t leveldb_iterator_t; +typedef struct leveldb_logger_t leveldb_logger_t; +typedef struct leveldb_options_t leveldb_options_t; +typedef struct leveldb_randomfile_t leveldb_randomfile_t; +typedef struct leveldb_readoptions_t leveldb_readoptions_t; +typedef struct leveldb_seqfile_t leveldb_seqfile_t; +typedef struct leveldb_snapshot_t leveldb_snapshot_t; +typedef struct leveldb_writablefile_t leveldb_writablefile_t; +typedef struct leveldb_writebatch_t leveldb_writebatch_t; +typedef struct leveldb_writeoptions_t leveldb_writeoptions_t; + +/* DB operations */ + +extern leveldb_t* leveldb_open( + const leveldb_options_t* options, + const char* name, + char** errptr); + +extern void leveldb_close(leveldb_t* db); + +extern void leveldb_put( + leveldb_t* db, + const leveldb_writeoptions_t* options, + const char* key, size_t keylen, + const char* val, size_t vallen, + char** errptr); + +extern void leveldb_delete( + leveldb_t* db, + const leveldb_writeoptions_t* options, + const char* key, size_t keylen, + char** errptr); + +extern void leveldb_write( + leveldb_t* db, + const leveldb_writeoptions_t* options, + leveldb_writebatch_t* batch, + char** errptr); + +/* Returns NULL if not found. A malloc()ed array otherwise. + Stores the length of the array in *vallen. */ +extern char* leveldb_get( + leveldb_t* db, + const leveldb_readoptions_t* options, + const char* key, size_t keylen, + size_t* vallen, + char** errptr); + +extern leveldb_iterator_t* leveldb_create_iterator( + leveldb_t* db, + const leveldb_readoptions_t* options); + +extern const leveldb_snapshot_t* leveldb_create_snapshot( + leveldb_t* db); + +extern void leveldb_release_snapshot( + leveldb_t* db, + const leveldb_snapshot_t* snapshot); + +/* Returns NULL if property name is unknown. + Else returns a pointer to a malloc()-ed null-terminated value. */ +extern char* leveldb_property_value( + leveldb_t* db, + const char* propname); + +extern void leveldb_approximate_sizes( + leveldb_t* db, + int num_ranges, + const char* const* range_start_key, const size_t* range_start_key_len, + const char* const* range_limit_key, const size_t* range_limit_key_len, + uint64_t* sizes); + +/* Management operations */ + +extern void leveldb_destroy_db( + const leveldb_options_t* options, + const char* name, + char** errptr); + +extern void leveldb_repair_db( + const leveldb_options_t* options, + const char* name, + char** errptr); + +/* Iterator */ + +extern void leveldb_iter_destroy(leveldb_iterator_t*); +extern unsigned char leveldb_iter_valid(const leveldb_iterator_t*); +extern void leveldb_iter_seek_to_first(leveldb_iterator_t*); +extern void leveldb_iter_seek_to_last(leveldb_iterator_t*); +extern void leveldb_iter_seek(leveldb_iterator_t*, const char* k, size_t klen); +extern void leveldb_iter_next(leveldb_iterator_t*); +extern void leveldb_iter_prev(leveldb_iterator_t*); +extern const char* leveldb_iter_key(const leveldb_iterator_t*, size_t* klen); +extern const char* leveldb_iter_value(const leveldb_iterator_t*, size_t* vlen); +extern void leveldb_iter_get_error(const leveldb_iterator_t*, char** errptr); + +/* Write batch */ + +extern leveldb_writebatch_t* leveldb_writebatch_create(); +extern void leveldb_writebatch_destroy(leveldb_writebatch_t*); +extern void leveldb_writebatch_clear(leveldb_writebatch_t*); +extern void leveldb_writebatch_put( + leveldb_writebatch_t*, + const char* key, size_t klen, + const char* val, size_t vlen); +extern void leveldb_writebatch_delete( + leveldb_writebatch_t*, + const char* key, size_t klen); +extern void leveldb_writebatch_iterate( + leveldb_writebatch_t*, + void* state, + void (*put)(void*, const char* k, size_t klen, const char* v, size_t vlen), + void (*deleted)(void*, const char* k, size_t klen)); + +/* Options */ + +extern leveldb_options_t* leveldb_options_create(); +extern void leveldb_options_destroy(leveldb_options_t*); +extern void leveldb_options_set_comparator( + leveldb_options_t*, + leveldb_comparator_t*); +extern void leveldb_options_set_create_if_missing( + leveldb_options_t*, unsigned char); +extern void leveldb_options_set_error_if_exists( + leveldb_options_t*, unsigned char); +extern void leveldb_options_set_paranoid_checks( + leveldb_options_t*, unsigned char); +extern void leveldb_options_set_env(leveldb_options_t*, leveldb_env_t*); +extern void leveldb_options_set_info_log(leveldb_options_t*, leveldb_logger_t*); +extern void leveldb_options_set_write_buffer_size(leveldb_options_t*, size_t); +extern void leveldb_options_set_max_open_files(leveldb_options_t*, int); +extern void leveldb_options_set_cache(leveldb_options_t*, leveldb_cache_t*); +extern void leveldb_options_set_block_size(leveldb_options_t*, size_t); +extern void leveldb_options_set_block_restart_interval(leveldb_options_t*, int); + +enum { + leveldb_no_compression = 0, + leveldb_snappy_compression = 1 +}; +extern void leveldb_options_set_compression(leveldb_options_t*, int); + +/* Comparator */ + +extern leveldb_comparator_t* leveldb_comparator_create( + void* state, + void (*destructor)(void*), + int (*compare)( + void*, + const char* a, size_t alen, + const char* b, size_t blen), + const char* (*name)(void*)); +extern void leveldb_comparator_destroy(leveldb_comparator_t*); + +/* Read options */ + +extern leveldb_readoptions_t* leveldb_readoptions_create(); +extern void leveldb_readoptions_destroy(leveldb_readoptions_t*); +extern void leveldb_readoptions_set_verify_checksums( + leveldb_readoptions_t*, + unsigned char); +extern void leveldb_readoptions_set_fill_cache( + leveldb_readoptions_t*, unsigned char); +extern void leveldb_readoptions_set_snapshot( + leveldb_readoptions_t*, + const leveldb_snapshot_t*); + +/* Write options */ + +extern leveldb_writeoptions_t* leveldb_writeoptions_create(); +extern void leveldb_writeoptions_destroy(leveldb_writeoptions_t*); +extern void leveldb_writeoptions_set_sync( + leveldb_writeoptions_t*, unsigned char); + +/* Cache */ + +extern leveldb_cache_t* leveldb_cache_create_lru(size_t capacity); +extern void leveldb_cache_destroy(leveldb_cache_t* cache); + +/* Env */ + +extern leveldb_env_t* leveldb_create_default_env(); +extern void leveldb_env_destroy(leveldb_env_t*); + +#ifdef __cplusplus +} /* end extern "C" */ +#endif + +#endif /* STORAGE_LEVELDB_INCLUDE_C_H_ */ diff --git a/include/leveldb/db.h b/include/leveldb/db.h index 79bd283..f945dd7 100644 --- a/include/leveldb/db.h +++ b/include/leveldb/db.h @@ -33,6 +33,7 @@ struct Range { Slice start; // Included in the range Slice limit; // Not included in the range + Range() { } Range(const Slice& s, const Slice& l) : start(s), limit(l) { } };