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471 linhas
12 KiB
471 linhas
12 KiB
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include "leveldb/c.h"
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#include <stdlib.h>
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#include <unistd.h>
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#include "leveldb/cache.h"
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#include "leveldb/comparator.h"
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#include "leveldb/db.h"
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#include "leveldb/env.h"
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#include "leveldb/iterator.h"
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#include "leveldb/options.h"
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#include "leveldb/status.h"
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#include "leveldb/write_batch.h"
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using leveldb::Cache;
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using leveldb::Comparator;
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using leveldb::CompressionType;
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using leveldb::DB;
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using leveldb::Env;
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using leveldb::FileLock;
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using leveldb::Iterator;
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using leveldb::Logger;
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using leveldb::NewLRUCache;
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using leveldb::Options;
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using leveldb::RandomAccessFile;
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using leveldb::Range;
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using leveldb::ReadOptions;
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using leveldb::SequentialFile;
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using leveldb::Slice;
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using leveldb::Snapshot;
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using leveldb::Status;
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using leveldb::WritableFile;
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using leveldb::WriteBatch;
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using leveldb::WriteOptions;
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extern "C" {
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struct leveldb_t { DB* rep; };
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struct leveldb_iterator_t { Iterator* rep; };
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struct leveldb_writebatch_t { WriteBatch rep; };
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struct leveldb_snapshot_t { const Snapshot* rep; };
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struct leveldb_readoptions_t { ReadOptions rep; };
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struct leveldb_writeoptions_t { WriteOptions rep; };
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struct leveldb_options_t { Options rep; };
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struct leveldb_cache_t { Cache* rep; };
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struct leveldb_seqfile_t { SequentialFile* rep; };
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struct leveldb_randomfile_t { RandomAccessFile* rep; };
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struct leveldb_writablefile_t { WritableFile* rep; };
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struct leveldb_logger_t { Logger* rep; };
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struct leveldb_filelock_t { FileLock* rep; };
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struct leveldb_comparator_t : public Comparator {
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void* state_;
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void (*destructor_)(void*);
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int (*compare_)(
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void*,
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const char* a, size_t alen,
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const char* b, size_t blen);
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const char* (*name_)(void*);
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virtual ~leveldb_comparator_t() {
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(*destructor_)(state_);
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}
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virtual int Compare(const Slice& a, const Slice& b) const {
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return (*compare_)(state_, a.data(), a.size(), b.data(), b.size());
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}
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virtual const char* Name() const {
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return (*name_)(state_);
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}
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// No-ops since the C binding does not support key shortening methods.
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virtual void FindShortestSeparator(std::string*, const Slice&) const { }
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virtual void FindShortSuccessor(std::string* key) const { }
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};
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struct leveldb_env_t {
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Env* rep;
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bool is_default;
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};
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static bool SaveError(char** errptr, const Status& s) {
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assert(errptr != NULL);
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if (s.ok()) {
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return false;
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} else if (*errptr == NULL) {
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*errptr = strdup(s.ToString().c_str());
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} else {
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// TODO(sanjay): Merge with existing error?
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free(*errptr);
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*errptr = strdup(s.ToString().c_str());
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}
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return true;
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}
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static char* CopyString(const std::string& str) {
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char* result = reinterpret_cast<char*>(malloc(sizeof(char) * str.size()));
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memcpy(result, str.data(), sizeof(char) * str.size());
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return result;
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}
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leveldb_t* leveldb_open(
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const leveldb_options_t* options,
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const char* name,
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char** errptr) {
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DB* db;
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if (SaveError(errptr, DB::Open(options->rep, std::string(name), &db))) {
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return NULL;
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}
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leveldb_t* result = new leveldb_t;
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result->rep = db;
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return result;
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}
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void leveldb_close(leveldb_t* db) {
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delete db->rep;
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delete db;
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}
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void leveldb_put(
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leveldb_t* db,
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const leveldb_writeoptions_t* options,
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const char* key, size_t keylen,
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const char* val, size_t vallen,
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char** errptr) {
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SaveError(errptr,
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db->rep->Put(options->rep, Slice(key, keylen), Slice(val, vallen)));
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}
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void leveldb_delete(
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leveldb_t* db,
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const leveldb_writeoptions_t* options,
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const char* key, size_t keylen,
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char** errptr) {
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SaveError(errptr, db->rep->Delete(options->rep, Slice(key, keylen)));
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}
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void leveldb_write(
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leveldb_t* db,
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const leveldb_writeoptions_t* options,
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leveldb_writebatch_t* batch,
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char** errptr) {
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SaveError(errptr, db->rep->Write(options->rep, &batch->rep));
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}
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char* leveldb_get(
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leveldb_t* db,
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const leveldb_readoptions_t* options,
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const char* key, size_t keylen,
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size_t* vallen,
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char** errptr) {
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char* result = NULL;
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std::string tmp;
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Status s = db->rep->Get(options->rep, Slice(key, keylen), &tmp);
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if (s.ok()) {
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*vallen = tmp.size();
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result = CopyString(tmp);
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} else {
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*vallen = 0;
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if (!s.IsNotFound()) {
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SaveError(errptr, s);
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}
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}
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return result;
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}
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leveldb_iterator_t* leveldb_create_iterator(
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leveldb_t* db,
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const leveldb_readoptions_t* options) {
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leveldb_iterator_t* result = new leveldb_iterator_t;
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result->rep = db->rep->NewIterator(options->rep);
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return result;
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}
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const leveldb_snapshot_t* leveldb_create_snapshot(
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leveldb_t* db) {
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leveldb_snapshot_t* result = new leveldb_snapshot_t;
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result->rep = db->rep->GetSnapshot();
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return result;
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}
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void leveldb_release_snapshot(
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leveldb_t* db,
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const leveldb_snapshot_t* snapshot) {
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db->rep->ReleaseSnapshot(snapshot->rep);
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delete snapshot;
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}
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char* leveldb_property_value(
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leveldb_t* db,
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const char* propname) {
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std::string tmp;
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if (db->rep->GetProperty(Slice(propname), &tmp)) {
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// We use strdup() since we expect human readable output.
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return strdup(tmp.c_str());
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} else {
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return NULL;
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}
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}
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void leveldb_approximate_sizes(
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leveldb_t* db,
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int num_ranges,
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const char* const* range_start_key, const size_t* range_start_key_len,
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const char* const* range_limit_key, const size_t* range_limit_key_len,
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uint64_t* sizes) {
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Range* ranges = new Range[num_ranges];
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for (int i = 0; i < num_ranges; i++) {
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ranges[i].start = Slice(range_start_key[i], range_start_key_len[i]);
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ranges[i].limit = Slice(range_limit_key[i], range_limit_key_len[i]);
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}
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db->rep->GetApproximateSizes(ranges, num_ranges, sizes);
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delete[] ranges;
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}
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void leveldb_destroy_db(
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const leveldb_options_t* options,
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const char* name,
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char** errptr) {
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SaveError(errptr, DestroyDB(name, options->rep));
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}
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void leveldb_repair_db(
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const leveldb_options_t* options,
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const char* name,
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char** errptr) {
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SaveError(errptr, RepairDB(name, options->rep));
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}
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void leveldb_iter_destroy(leveldb_iterator_t* iter) {
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delete iter->rep;
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delete iter;
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}
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unsigned char leveldb_iter_valid(const leveldb_iterator_t* iter) {
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return iter->rep->Valid();
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}
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void leveldb_iter_seek_to_first(leveldb_iterator_t* iter) {
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iter->rep->SeekToFirst();
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}
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void leveldb_iter_seek_to_last(leveldb_iterator_t* iter) {
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iter->rep->SeekToLast();
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}
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void leveldb_iter_seek(leveldb_iterator_t* iter, const char* k, size_t klen) {
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iter->rep->Seek(Slice(k, klen));
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}
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void leveldb_iter_next(leveldb_iterator_t* iter) {
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iter->rep->Next();
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}
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void leveldb_iter_prev(leveldb_iterator_t* iter) {
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iter->rep->Prev();
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}
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const char* leveldb_iter_key(const leveldb_iterator_t* iter, size_t* klen) {
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Slice s = iter->rep->key();
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*klen = s.size();
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return s.data();
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}
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const char* leveldb_iter_value(const leveldb_iterator_t* iter, size_t* vlen) {
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Slice s = iter->rep->value();
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*vlen = s.size();
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return s.data();
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}
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void leveldb_iter_get_error(const leveldb_iterator_t* iter, char** errptr) {
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SaveError(errptr, iter->rep->status());
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}
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leveldb_writebatch_t* leveldb_writebatch_create() {
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return new leveldb_writebatch_t;
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}
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void leveldb_writebatch_destroy(leveldb_writebatch_t* b) {
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delete b;
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}
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void leveldb_writebatch_clear(leveldb_writebatch_t* b) {
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b->rep.Clear();
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}
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void leveldb_writebatch_put(
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leveldb_writebatch_t* b,
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const char* key, size_t klen,
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const char* val, size_t vlen) {
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b->rep.Put(Slice(key, klen), Slice(val, vlen));
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}
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void leveldb_writebatch_delete(
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leveldb_writebatch_t* b,
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const char* key, size_t klen) {
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b->rep.Delete(Slice(key, klen));
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}
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void leveldb_writebatch_iterate(
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leveldb_writebatch_t* b,
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void* state,
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void (*put)(void*, const char* k, size_t klen, const char* v, size_t vlen),
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void (*deleted)(void*, const char* k, size_t klen)) {
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class H : public WriteBatch::Handler {
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public:
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void* state_;
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void (*put_)(void*, const char* k, size_t klen, const char* v, size_t vlen);
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void (*deleted_)(void*, const char* k, size_t klen);
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virtual void Put(const Slice& key, const Slice& value) {
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(*put_)(state_, key.data(), key.size(), value.data(), value.size());
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}
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virtual void Delete(const Slice& key) {
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(*deleted_)(state_, key.data(), key.size());
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}
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};
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H handler;
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handler.state_ = state;
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handler.put_ = put;
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handler.deleted_ = deleted;
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b->rep.Iterate(&handler);
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}
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leveldb_options_t* leveldb_options_create() {
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return new leveldb_options_t;
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}
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void leveldb_options_destroy(leveldb_options_t* options) {
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delete options;
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}
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void leveldb_options_set_comparator(
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leveldb_options_t* opt,
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leveldb_comparator_t* cmp) {
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opt->rep.comparator = cmp;
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}
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void leveldb_options_set_create_if_missing(
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leveldb_options_t* opt, unsigned char v) {
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opt->rep.create_if_missing = v;
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}
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void leveldb_options_set_error_if_exists(
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leveldb_options_t* opt, unsigned char v) {
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opt->rep.error_if_exists = v;
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}
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void leveldb_options_set_paranoid_checks(
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leveldb_options_t* opt, unsigned char v) {
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opt->rep.paranoid_checks = v;
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}
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void leveldb_options_set_env(leveldb_options_t* opt, leveldb_env_t* env) {
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opt->rep.env = (env ? env->rep : NULL);
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}
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void leveldb_options_set_info_log(leveldb_options_t* opt, leveldb_logger_t* l) {
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opt->rep.info_log = (l ? l->rep : NULL);
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}
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void leveldb_options_set_write_buffer_size(leveldb_options_t* opt, size_t s) {
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opt->rep.write_buffer_size = s;
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}
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void leveldb_options_set_max_open_files(leveldb_options_t* opt, int n) {
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opt->rep.max_open_files = n;
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}
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void leveldb_options_set_cache(leveldb_options_t* opt, leveldb_cache_t* c) {
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opt->rep.block_cache = c->rep;
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}
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void leveldb_options_set_block_size(leveldb_options_t* opt, size_t s) {
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opt->rep.block_size = s;
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}
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void leveldb_options_set_block_restart_interval(leveldb_options_t* opt, int n) {
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opt->rep.block_restart_interval = n;
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}
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void leveldb_options_set_compression(leveldb_options_t* opt, int t) {
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opt->rep.compression = static_cast<CompressionType>(t);
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}
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leveldb_comparator_t* leveldb_comparator_create(
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void* state,
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void (*destructor)(void*),
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int (*compare)(
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void*,
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const char* a, size_t alen,
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const char* b, size_t blen),
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const char* (*name)(void*)) {
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leveldb_comparator_t* result = new leveldb_comparator_t;
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result->state_ = state;
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result->destructor_ = destructor;
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result->compare_ = compare;
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result->name_ = name;
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return result;
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}
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void leveldb_comparator_destroy(leveldb_comparator_t* cmp) {
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delete cmp;
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}
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leveldb_readoptions_t* leveldb_readoptions_create() {
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return new leveldb_readoptions_t;
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}
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void leveldb_readoptions_destroy(leveldb_readoptions_t* opt) {
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delete opt;
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}
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void leveldb_readoptions_set_verify_checksums(
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leveldb_readoptions_t* opt,
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unsigned char v) {
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opt->rep.verify_checksums = v;
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}
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void leveldb_readoptions_set_fill_cache(
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leveldb_readoptions_t* opt, unsigned char v) {
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opt->rep.fill_cache = v;
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}
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void leveldb_readoptions_set_snapshot(
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leveldb_readoptions_t* opt,
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const leveldb_snapshot_t* snap) {
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opt->rep.snapshot = (snap ? snap->rep : NULL);
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}
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leveldb_writeoptions_t* leveldb_writeoptions_create() {
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return new leveldb_writeoptions_t;
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}
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void leveldb_writeoptions_destroy(leveldb_writeoptions_t* opt) {
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delete opt;
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}
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void leveldb_writeoptions_set_sync(
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leveldb_writeoptions_t* opt, unsigned char v) {
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opt->rep.sync = v;
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}
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leveldb_cache_t* leveldb_cache_create_lru(size_t capacity) {
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leveldb_cache_t* c = new leveldb_cache_t;
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c->rep = NewLRUCache(capacity);
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return c;
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}
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void leveldb_cache_destroy(leveldb_cache_t* cache) {
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delete cache->rep;
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delete cache;
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}
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leveldb_env_t* leveldb_create_default_env() {
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leveldb_env_t* result = new leveldb_env_t;
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result->rep = Env::Default();
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result->is_default = true;
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return result;
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}
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void leveldb_env_destroy(leveldb_env_t* env) {
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if (!env->is_default) delete env->rep;
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delete env;
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}
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} // end extern "C"
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