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monero/external/glim/test_ldb.cc
Thomas Winget 90d6f8bf62 Adding libglim as an external library 
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.
2015-01-04 18:41:44 -08:00

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