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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*/
// install the librados-dev and librbd package to get this
#include <rados/librados.hpp>
#include <rbd/librbd.hpp>
#include <iostream>
#include <string>
#include <sstream>
int main(int argc, const char **argv)
{
int ret = 0;
// we will use all of these below
const char *pool_name = "hello_world_pool";
std::string hello("hello world!");
std::string object_name("hello_object");
librados::IoCtx io_ctx;
// first, we create a Rados object and initialize it
librados::Rados rados;
{
ret = rados.init("admin"); // just use the client.admin keyring
if (ret < 0) { // let's handle any error that might have come back
std::cerr << "couldn't initialize rados! error " << ret << std::endl;
ret = EXIT_FAILURE;
goto out;
} else {
std::cout << "we just set up a rados cluster object" << std::endl;
}
}
/*
* Now we need to get the rados object its config info. It can
* parse argv for us to find the id, monitors, etc, so let's just
* use that.
*/
{
ret = rados.conf_parse_argv(argc, argv);
if (ret < 0) {
// This really can't happen, but we need to check to be a good citizen.
std::cerr << "failed to parse config options! error " << ret << std::endl;
ret = EXIT_FAILURE;
goto out;
} else {
std::cout << "we just parsed our config options" << std::endl;
// We also want to apply the config file if the user specified
// one, and conf_parse_argv won't do that for us.
for (int i = 0; i < argc; ++i) {
if ((strcmp(argv[i], "-c") == 0) || (strcmp(argv[i], "--conf") == 0)) {
ret = rados.conf_read_file(argv[i+1]);
if (ret < 0) {
// This could fail if the config file is malformed, but it'd be hard.
std::cerr << "failed to parse config file " << argv[i+1]
<< "! error" << ret << std::endl;
ret = EXIT_FAILURE;
goto out;
}
break;
}
}
}
}
/*
* next, we actually connect to the cluster
*/
{
ret = rados.connect();
if (ret < 0) {
std::cerr << "couldn't connect to cluster! error " << ret << std::endl;
ret = EXIT_FAILURE;
goto out;
} else {
std::cout << "we just connected to the rados cluster" << std::endl;
}
}
/*
* let's create our own pool instead of scribbling over real data.
* Note that this command creates pools with default PG counts specified
* by the monitors, which may not be appropriate for real use -- it's fine
* for testing, though.
*/
{
ret = rados.pool_create(pool_name);
if (ret < 0) {
std::cerr << "couldn't create pool! error " << ret << std::endl;
return EXIT_FAILURE;
} else {
std::cout << "we just created a new pool named " << pool_name << std::endl;
}
}
/*
* create an "IoCtx" which is used to do IO to a pool
*/
{
ret = rados.ioctx_create(pool_name, io_ctx);
if (ret < 0) {
std::cerr << "couldn't set up ioctx! error " << ret << std::endl;
ret = EXIT_FAILURE;
goto out;
} else {
std::cout << "we just created an ioctx for our pool" << std::endl;
}
}
/*
* create an rbd image and write data to it
*/
{
std::string name = "librbd_test";
uint64_t size = 2 << 20;
int order = 0;
librbd::RBD rbd;
librbd::Image image;
ret = rbd.create(io_ctx, name.c_str(), size, &order);
if (ret < 0) {
std::cerr << "couldn't create an rbd image! error " << ret << std::endl;
ret = EXIT_FAILURE;
goto out;
} else {
std::cout << "we just created an rbd image" << std::endl;
}
ret = rbd.open(io_ctx, image, name.c_str(), NULL);
if (ret < 0) {
std::cerr << "couldn't open the rbd image! error " << ret << std::endl;
ret = EXIT_FAILURE;
goto out;
} else {
std::cout << "we just opened the rbd image" << std::endl;
}
int TEST_IO_SIZE = 512;
char test_data[TEST_IO_SIZE + 1];
int i;
for (i = 0; i < TEST_IO_SIZE; ++i) {
test_data[i] = (char) (rand() % (126 - 33) + 33);
}
test_data[TEST_IO_SIZE] = '\0';
size_t len = strlen(test_data);
ceph::bufferlist bl;
bl.append(test_data, len);
ret = image.write(0, len, bl);
if (ret < 0) {
std::cerr << "couldn't write to the rbd image! error " << ret << std::endl;
ret = EXIT_FAILURE;
goto out;
} else {
std::cout << "we just wrote data to our rbd image " << std::endl;
}
/*
* let's read the image and compare it to the data we wrote
*/
ceph::bufferlist bl_r;
int read;
read = image.read(0, TEST_IO_SIZE, bl_r);
if (read < 0) {
std::cerr << "we couldn't read data from the image! error" << std::endl;
ret = EXIT_FAILURE;
goto out;
}
std::string bl_res(bl_r.c_str(), read);
int res = memcmp(bl_res.c_str(), test_data, TEST_IO_SIZE);
if (res != 0) {
std::cerr << "what we read didn't match expected! error" << std::endl;
} else {
std::cout << "we read our data on the image successfully" << std::endl;
}
image.close();
/*
*let's now delete the image
*/
ret = rbd.remove(io_ctx, name.c_str());
if (ret < 0) {
std::cerr << "failed to delete rbd image! error " << ret << std::endl;
ret = EXIT_FAILURE;
goto out;
} else {
std::cout << "we just deleted our rbd image " << std::endl;
}
}
ret = EXIT_SUCCESS;
out:
/*
* And now we're done, so let's remove our pool and then
* shut down the connection gracefully.
*/
int delete_ret = rados.pool_delete(pool_name);
if (delete_ret < 0) {
// be careful not to
std::cerr << "We failed to delete our test pool!" << std::endl;
ret = EXIT_FAILURE;
}
rados.shutdown();
return ret;
}