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// SERVER-7282 Faulty logic when testing maximum collection name length.
// constants from server
var maxNsLength = 127;
var maxNsCollectionLength = 120;
var myDb = db.getSiblingDB("ns_length");
myDb.dropDatabase(); // start empty
function mkStr(length) {
s = "";
while (s.length < length) {
s += "x";
}
return s;
}
function canMakeCollectionWithName(name) {
assert.eq(myDb.stats().storageSize, 0, "initial conditions");
var success = false;
try {
// may either throw or return an error
success = !(myDb[name].insert({}).hasWriteError());
} catch (e) {
success = false;
}
if (!success) {
assert.eq(myDb.stats().storageSize, 0, "no files should be created on error");
return false;
}
myDb.dropDatabase();
return true;
}
function canMakeIndexWithName(collection, name) {
var success = collection.ensureIndex({x: 1}, {name: name}).ok;
if (success) {
assert.commandWorked(collection.dropIndex(name));
}
return success;
}
function canRenameCollection(from, to) {
var success = myDb[from].renameCollection(to).ok;
if (success) {
// put it back
assert.commandWorked(myDb[to].renameCollection(from));
}
return success;
}
// test making collections around the name limit
var prefixOverhead = (myDb.getName() + ".").length;
var maxCollectionNameLength = maxNsCollectionLength - prefixOverhead;
for (var i = maxCollectionNameLength - 3; i <= maxCollectionNameLength + 3; i++) {
assert.eq(canMakeCollectionWithName(mkStr(i)),
i <= maxCollectionNameLength,
"ns name length = " + (prefixOverhead + i));
}
// test making indexes around the name limit
var collection = myDb.collection;
collection.insert({});
var maxIndexNameLength = maxNsLength - (collection.getFullName() + ".$").length;
for (var i = maxIndexNameLength - 3; i <= maxIndexNameLength + 3; i++) {
assert.eq(canMakeIndexWithName(collection, mkStr(i)),
i <= maxIndexNameLength,
"index ns name length = " + ((collection.getFullName() + ".$").length + i));
}
// test renaming collections with the destination around the name limit
myDb.from.insert({});
for (var i = maxCollectionNameLength - 3; i <= maxCollectionNameLength + 3; i++) {
assert.eq(canRenameCollection("from", mkStr(i)),
i <= maxCollectionNameLength,
"new ns name length = " + (prefixOverhead + i));
}
// test renaming collections with the destination around the name limit due to long indexe names
myDb.from.ensureIndex({a: 1}, {name: mkStr(100)});
var indexNsNameOverhead = (myDb.getName() + "..$").length + 100; // index ns name - collection name
var maxCollectionNameWithIndex = maxNsLength - indexNsNameOverhead;
for (var i = maxCollectionNameWithIndex - 3; i <= maxCollectionNameWithIndex + 3; i++) {
assert.eq(canRenameCollection("from", mkStr(i)),
i <= maxCollectionNameWithIndex,
"index ns name length = " + (indexNsNameOverhead + i));
}
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