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90d6f8bf62
libglim is an Apache-licensed C++ wrapper for lmdb, and rather than rolling our own it seems prudent to use it. Note: lmdb is not included in it, and unless something happens as did with libunbound, should be installed via each OS' package manager or equivalent.
165 lines
8.5 KiB
C++
165 lines
8.5 KiB
C++
#include "ldb.hpp"
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using glim::Ldb;
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using glim::gstring;
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#include <iostream>
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using std::cout; using std::flush; using std::endl;
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#include <assert.h>
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#include <boost/filesystem.hpp>
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void test1 (Ldb& ldb) {
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ldb.put (std::string ("foo_"), std::string ("bar"));
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ldb.put ((uint32_t) 123, 1);
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ldb.put ((uint32_t) 123, 2);
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ldb.put (C2GSTRING ("foo"), 3);
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ldb.put (C2GSTRING ("foo"), 4);
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ldb.put (C2GSTRING ("gsk"), C2GSTRING ("gsv"));
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std::string ts; int ti; gstring tgs;
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auto fail = [](std::string msg) {throw std::runtime_error ("assertion failed: " + msg);};
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if (!ldb.get (std::string ("foo_"), ts) || ts != "bar") fail ("!foo_=bar");
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if (!ldb.get ((uint32_t) 123, ti) || ti != 2) fail ("!123=2");
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if (!ldb.get (C2GSTRING ("foo"), ti) || ti != 4) fail ("!foo=4");
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if (!ldb.get (C2GSTRING ("gsk"), tgs) || tgs != "gsv") fail ("!gsk=gsv");
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// Test range-based for.
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int count = 0; bool haveGskGsv = false;
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for (auto&& entry: ldb) {
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if (!entry._lit->Valid()) fail ("!entry");
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if (entry.keyView() == "gsk") {
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if (entry.getKey<gstring>() != "gsk") fail ("getKey(gsk)!=gsk");
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if (entry.getValue<gstring>() != "gsv") fail ("getValue(gsk)!=gsv");
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haveGskGsv = true;
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}
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++count;}
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if (count != 4) fail ("count!=4"); // foo_=bar, 123=2, foo=4, gsk=gsv
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if (!haveGskGsv) fail ("!haveGskGsv");
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ldb.del ((uint32_t) 123); if (ldb.get ((uint32_t) 123, ti)) fail ("123");
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ldb.del (C2GSTRING ("foo")); if (ldb.get (C2GSTRING ("foo"), ti)) fail ("foo");
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ldb.del (std::string ("foo_"));
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{ // We've erased "123" and "foo", the only key left is "gsk" (gsk=gsv), let's test the iterator boundaries on this small dataset.
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auto&& it = ldb.begin();
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if (it->getKey<gstring>() != "gsk") fail ("first key !gsk " + it->keyView().str());
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if (!(++it).end()) fail ("++it != end");
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if ((--it)->getKey<gstring>() != "gsk") fail ("can't go back to gsk");
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if (!(--it).end()) fail ("--it != end");
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if ((++it)->getKey<gstring>() != "gsk") fail ("can't go forward to gsk");
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}
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// todo: index trigger example
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// struct SimpleIndexTrigger: public Trigger { // Uses key space partitioning (cf. http://stackoverflow.com/a/12503799/257568)
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// const char* _name; Ldb _indexDb;
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// SimpleIndexTrigger (Ldb& ldb, const char* name = "index"): _name (name), _indexDb (ldb._env, name) {}
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// gstring triggerName() {return gstring (0, (void*) _name, false, strlen (_name), true);}
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// void add (Ldb& ldb, void* key, gstring& kbytes, void* value, gstring& vbytes, Transaction& txn) {
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// MDB_val mkey = {vbytes.size(), (void*) vbytes.data()};
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// MDB_val mvalue = {kbytes.size(), (void*) kbytes.data()};
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// int rc = ::ldb_put (txn.get(), _indexDb._dbi, &mkey, &mvalue, 0);
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// if (rc) GNTHROW (LdbEx, std::string ("index, ldb_put: ") + ::strerror (rc));
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// }
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// void erase (Ldb& ldb, void* ekey, gstring& kbytes, Transaction& txn) {
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// // Get all the values and remove them from the index.
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// MDB_cursor* cur = 0; int rc = ::ldb_cursor_open (txn.get(), ldb._dbi, &cur);
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// if (rc) GNTHROW (LdbEx, std::string ("index, erase, ldb_cursor_open: ") + ::strerror (rc));
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// std::unique_ptr<MDB_cursor, void(*)(MDB_cursor*)> curHolder (cur, ::ldb_cursor_close);
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// MDB_val mkey = {kbytes.size(), (void*) kbytes.data()}, val = {0, 0};
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// rc = ::ldb_cursor_get (cur, &mkey, &val, ::MDB_SET_KEY); if (rc == MDB_NOTFOUND) return;
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// if (rc) GNTHROW (LdbEx, std::string ("index, erase, ldb_cursor_get: ") + ::strerror (rc));
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// rc = ::ldb_del (txn.get(), _indexDb._dbi, &val, &mkey);
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// if (rc && rc != MDB_NOTFOUND) GNTHROW (LdbEx, std::string ("index, erase, ldb_del: ") + ::strerror (rc));
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// for (;;) {
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// rc = ::ldb_cursor_get (cur, &mkey, &val, ::MDB_NEXT_DUP); if (rc == MDB_NOTFOUND) return;
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// if (rc) GNTHROW (LdbEx, std::string ("index, erase, ldb_cursor_get: ") + ::strerror (rc));
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// rc = ::ldb_del (txn.get(), _indexDb._dbi, &val, &mkey);
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// if (rc && rc != MDB_NOTFOUND) GNTHROW (LdbEx, std::string ("index, erase, ldb_del: ") + ::strerror (rc));
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// }
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// }
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// void eraseKV (Ldb& ldb, void* key, gstring& kbytes, void* value, gstring& vbytes, Transaction& txn) {
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// MDB_val mkey = {vbytes.size(), (void*) vbytes.data()};
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// MDB_val mvalue = {kbytes.size(), (void*) kbytes.data()};
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// int rc = ::ldb_del (txn.get(), _indexDb._dbi, &mkey, &mvalue);
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// if (rc && rc != MDB_NOTFOUND) GNTHROW (LdbEx, std::string ("index, ldb_del: ") + ::strerror (rc));
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// }
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// };
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// auto indexTrigger = std::make_shared<SimpleIndexTrigger> (ldb); ldb.setTrigger (indexTrigger); auto& indexDb = indexTrigger->_indexDb;
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// ldb.erase (C2GSTRING ("gsk")); // NB: "gsk" wasn't indexed here. `IndexTrigger.erase` should handle this gracefully.
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// Add indexed.
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// ldb.put (C2GSTRING ("ik"), C2GSTRING ("iv1"));
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// ldb.put (C2GSTRING ("ik"), string ("iv2"));
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// ldb.put (C2GSTRING ("ik"), 3);
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// Check the index.
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// gstring ik;
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// if (!indexDb.first (C2GSTRING ("iv1"), ik) || ik != "ik") fail ("!iv1=ik");
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// if (!indexDb.first (string ("iv2"), ik) || ik != "ik") fail ("!iv2=ik");
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// if (!indexDb.first (3, ik) || ik != "ik") fail ("!iv3=ik");
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// Remove indexed.
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// ldb.eraseKV (C2GSTRING ("ik"), string ("iv2"));
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// Check the index.
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// if (!indexDb.first (C2GSTRING ("iv1"), ik) || ik != "ik") fail ("!iv1=ik");
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// if (indexDb.first (string ("iv2"), ik)) fail ("iv2=ik");
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// if (!indexDb.first (3, ik) || ik != "ik") fail ("!iv3=ik");
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// Remove indexed.
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// ldb.erase (C2GSTRING ("ik"));
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// Check the index.
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// if (indexDb.first (C2GSTRING ("iv1"), ik)) fail ("iv1");
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// if (indexDb.first (3, ik)) fail ("iv3");
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// Check the data.
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// if (ldb.first (C2GSTRING ("ik"), ik)) fail ("ik");
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}
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void testStartsWith (Ldb& ldb) {
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// Using `gstring`s because the Boost Serialization encoding for CStrings is not prefix-friendly.
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ldb.put (C2GSTRING ("01"), ""); ldb.put (C2GSTRING ("02"), "");
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ldb.put (C2GSTRING ("11"), "");
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ldb.put (C2GSTRING ("21"), ""); ldb.put (C2GSTRING ("222"), ""); ldb.put (C2GSTRING ("2"), "");
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auto range = ldb.startsWith (C2GSTRING ("0")); auto it = range.begin();
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assert (it->keyView() == "01"); assert (it != range.end());
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assert ((++it)->keyView() == "02"); assert (it != range.end());
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assert ((++it)->keyView().empty()); assert (it == range.end());
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assert ((--it)->keyView() == "02"); assert (it != range.end());
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assert ((--it)->keyView() == "01"); assert (it != range.end());
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assert ((--it)->keyView().empty()); assert (it == range.end());
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// `it` and `range.begin` point to the same `leveldb::Iterator`.
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assert (range.begin()._entry->_lit == it._entry->_lit);
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assert (!range.begin()._entry->_valid); assert (range.begin()->keyView().empty());
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range = ldb.startsWith (C2GSTRING ("0")); it = range.end();
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assert (it.end() && it->keyView().empty()); assert (it != range.begin());
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assert ((--it)->keyView() == "02"); assert (it != range.begin());
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assert ((--it)->keyView() == "01"); assert (it == range.begin());
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assert ((--it)->keyView().empty()); assert (it != range.begin());
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int8_t count = 0; for (auto& en: ldb.startsWith (C2GSTRING ("1"))) {en.keyView(); ++count;} assert (count == 1);
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count = 0; for (auto& en: ldb.startsWith (C2GSTRING ("2"))) {en.keyView(); ++count;} assert (count == 3);
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count = 0; for (auto& en: ldb.startsWith (C2GSTRING ("-"))) {en.keyView(); ++count;} assert (count == 0);
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count = 0; for (auto& en: ldb.startsWith (C2GSTRING (""))) {en.keyView(); ++count;} assert (count == 6);
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assert (ldb.startsWith (C2GSTRING ("-")) .empty());
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count = 0; for (auto& en: boost::make_iterator_range (ldb.end().seek ("1"), ldb.end().seek ("2"))) {en.keyView(); ++count;} assert (count == 1);
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count = 0; for (auto& en: boost::make_iterator_range (ldb.end().seek ("2"), ldb.end().seek ("3"))) {en.keyView(); ++count;} assert (count == 3);
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count = 0; for (auto& en: ldb.range (C2GSTRING ("1"), C2GSTRING ("2"))) {en.keyView(); ++count;} assert (count == 1);
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{ auto range = ldb.range (C2GSTRING ("0"), C2GSTRING ("1")); // 01 and 02, but not 11.
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count = 0; for (auto& en: range) {en.keyView(); ++count;} assert (count == 2); }
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}
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int main() {
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cout << "Testing ldb.hpp ... " << flush;
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boost::filesystem::remove_all ("/dev/shm/ldbTest");
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Ldb ldb ("/dev/shm/ldbTest");
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test1 (ldb);
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for (auto& en: ldb) ldb.del (en.keyView());
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testStartsWith (ldb);
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ldb._db.reset(); // Close.
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boost::filesystem::remove_all ("/dev/shm/ldbTest");
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cout << "pass." << endl;
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return 0;
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}
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