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| var rados = require('./build/Release/rados');
// EXEMPLE FILE
//==================================
// Connect to cluster
//==================================
var cluster = new rados.Rados( "ceph", "client.admin", "/etc/ceph/ceph.conf");
var err = cluster.connect();
if (err) {
// On connection error
console.log("Error " + err);
throw err;
}
// Print cluster FSID, pools
console.log( "fsid : " + cluster.get_fsid() );
console.log( "ls pools : " + cluster.pool_list() );
//==================================
// Create IOCTX
//==================================
var ioctx = new rados.Ioctx(cluster, "data");
console.log(" --- RUN Sync Write / Read --- ");
// Sync write_full
ioctx.write_full("testfile1", new Buffer("01234567ABCDEF"));
// Sync Read
console.log( "Read data : " +
ioctx.read("testfile1", ioctx.stat("testfile1").psize).toString() );
// Remove
ioctx.remove("testfile1");
console.log(" --- RUN ASync Write / Read --- ");
// ASync write_full
ioctx.aio_write("testfile2", new Buffer("1234567879ABCD"), 14, 0, function (err) {
if (err) {
throw err;
}
ioctx.aio_read("testfile2", 14, 0, function (err, data) {
if (err) {
throw err;
}
console.log("[async callback] data = " + data.toString());
});
});
//==================================
// Read / Write Attributes
//==================================
console.log(" --- RUN Attributes Write / Read --- ");
ioctx.setxattr("testfile3", "attr1", "first attr");
ioctx.setxattr("testfile3", "attr2", "second attr");
ioctx.setxattr("testfile3", "attr3", "last attr value");
var attrs = ioctx.getxattrs("testfile3");
console.log("testfile3 xattr = %j", attrs);
// destroy ioctx and close cluster after aio_flush
ioctx.aio_flush_async(function (err) {
ioctx.destroy();
cluster.shutdown();
});
process.exit(code=0)
// OTHER EXEMPLES
// Read Sync file in chunks
var file = "testfile";
var fileSize = ioctx.stat(file).psize,
chunkSize = 512,
bytesRead = 0;
while (bytesRead < fileSize) {
if ((bytesRead + chunkSize) > fileSize) {
chunkSize = (fileSize - bytesRead);
}
var buffer = ioctx.read(file, chunkSize, bytesRead);
bytesRead += chunkSize;
process.stdout.write(buffer.toString());
}
// Read Async file in chunks
var file = "testfile";
var fileSize = ioctx.stat(file).psize,
chunkSize = 512,
bytesRead = 0;
while (bytesRead < fileSize) {
if ((bytesRead + chunkSize) > fileSize) {
chunkSize = (fileSize - bytesRead);
}
ioctx.aio_read(file, chunkSize, bytesRead, function (err, data) {
process.stdout.write(data.toString());
});
bytesRead += chunkSize;
}
// Use snapshot
ioctx.write_full("testfile10", new Buffer("version1"));
ioctx.snap_create("snaptest1");
ioctx.write_full("testfile10", new Buffer("version2"));
ioctx.snap_create("snaptest2");
ioctx.write_full("testfile10", new Buffer("version3"));
ioctx.snap_create("snaptest3");
ioctx.snap_rollback("testfile10", "snaptest2");
console.log(ioctx.read("testfile10").toString());
ioctx.snap_remove("snaptest1");
ioctx.snap_remove("snaptest2");
ioctx.snap_remove("snaptest3");
|