94 lines
3.0 KiB
JavaScript
94 lines
3.0 KiB
JavaScript
// @tags: [requires_getmore, requires_capped]
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// Test that tailable cursors work correctly with skip and limit.
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(function() {
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"use strict";
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// Setup the capped collection.
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var collname = "jstests_tailable_skip_limit";
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var t = db[collname];
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t.drop();
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assert.commandWorked(db.createCollection(collname, {capped: true, size: 1024}));
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assert.writeOK(t.insert({_id: 1}));
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assert.writeOK(t.insert({_id: 2}));
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// Non-tailable with skip
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var cursor = t.find().skip(1);
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assert.eq(2, cursor.next()["_id"]);
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assert(!cursor.hasNext());
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assert.writeOK(t.insert({_id: 3}));
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assert(!cursor.hasNext());
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// Non-tailable with limit
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var cursor = t.find().limit(100);
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for (var i = 1; i <= 3; i++) {
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assert.eq(i, cursor.next()["_id"]);
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}
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assert(!cursor.hasNext());
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assert.writeOK(t.insert({_id: 4}));
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assert(!cursor.hasNext());
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// Non-tailable with negative limit
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var cursor = t.find().limit(-100);
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for (var i = 1; i <= 4; i++) {
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assert.eq(i, cursor.next()["_id"]);
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}
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assert(!cursor.hasNext());
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assert.writeOK(t.insert({_id: 5}));
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assert(!cursor.hasNext());
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// Tailable with skip
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cursor = t.find().addOption(2).skip(4);
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assert.eq(5, cursor.next()["_id"]);
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assert(!cursor.hasNext());
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assert.writeOK(t.insert({_id: 6}));
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assert(cursor.hasNext());
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assert.eq(6, cursor.next()["_id"]);
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// Tailable with limit
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var cursor = t.find().addOption(2).limit(100);
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for (var i = 1; i <= 6; i++) {
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assert.eq(i, cursor.next()["_id"]);
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}
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assert(!cursor.hasNext());
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assert.writeOK(t.insert({_id: 7}));
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assert(cursor.hasNext());
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assert.eq(7, cursor.next()["_id"]);
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// Tailable with negative limit is an error.
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assert.throws(function() {
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t.find().addOption(2).limit(-100).next();
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});
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assert.throws(function() {
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t.find().addOption(2).limit(-1).itcount();
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});
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// When using read commands, a limit of 1 with the tailable option is allowed. In legacy
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// readMode, an ntoreturn of 1 means the same thing as ntoreturn -1 and is disallowed with
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// tailable.
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if (db.getMongo().useReadCommands()) {
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assert.eq(1, t.find().addOption(2).limit(1).itcount());
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} else {
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assert.throws(function() {
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t.find().addOption(2).limit(1).itcount();
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});
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}
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// Tests that a tailable cursor over an empty capped collection produces a dead cursor, intended
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// to be run on both mongod and mongos. For SERVER-20720.
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t.drop();
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assert.commandWorked(db.createCollection(t.getName(), {capped: true, size: 1024}));
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var cmdRes = db.runCommand({find: t.getName(), tailable: true});
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assert.commandWorked(cmdRes);
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assert.eq(cmdRes.cursor.id, NumberLong(0));
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assert.eq(cmdRes.cursor.ns, t.getFullName());
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assert.eq(cmdRes.cursor.firstBatch.length, 0);
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// Test that the cursor works in the shell.
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assert.eq(t.find().addOption(2).itcount(), 0);
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assert.writeOK(t.insert({a: 1}));
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assert.eq(t.find().addOption(2).itcount(), 1);
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})();
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