package rados // #cgo LDFLAGS: -lrados // #include // #include import "C" import ( "bytes" "unsafe" "github.com/ceph/go-ceph/internal/retry" ) // ClusterStat represents Ceph cluster statistics. type ClusterStat struct { Kb uint64 Kb_used uint64 Kb_avail uint64 Num_objects uint64 } // Conn is a connection handle to a Ceph cluster. type Conn struct { cluster C.rados_t connected bool } // ClusterRef represents a fundamental RADOS cluster connection. type ClusterRef C.rados_t // Cluster returns the underlying RADOS cluster reference for this Conn. func (c *Conn) Cluster() ClusterRef { return ClusterRef(c.cluster) } // PingMonitor sends a ping to a monitor and returns the reply. func (c *Conn) PingMonitor(id string) (string, error) { c_id := C.CString(id) defer C.free(unsafe.Pointer(c_id)) var strlen C.size_t var strout *C.char ret := C.rados_ping_monitor(c.cluster, c_id, &strout, &strlen) defer C.rados_buffer_free(strout) if ret == 0 { reply := C.GoStringN(strout, (C.int)(strlen)) return reply, nil } return "", getError(ret) } // Connect establishes a connection to a RADOS cluster. It returns an error, // if any. func (c *Conn) Connect() error { ret := C.rados_connect(c.cluster) if ret != 0 { return getError(ret) } c.connected = true return nil } // Shutdown disconnects from the cluster. func (c *Conn) Shutdown() { if err := c.ensure_connected(); err != nil { return } freeConn(c) } // ReadConfigFile configures the connection using a Ceph configuration file. func (c *Conn) ReadConfigFile(path string) error { c_path := C.CString(path) defer C.free(unsafe.Pointer(c_path)) ret := C.rados_conf_read_file(c.cluster, c_path) return getError(ret) } // ReadDefaultConfigFile configures the connection using a Ceph configuration // file located at default locations. func (c *Conn) ReadDefaultConfigFile() error { ret := C.rados_conf_read_file(c.cluster, nil) return getError(ret) } // OpenIOContext creates and returns a new IOContext for the given pool. // // Implements: // int rados_ioctx_create(rados_t cluster, const char *pool_name, // rados_ioctx_t *ioctx); func (c *Conn) OpenIOContext(pool string) (*IOContext, error) { c_pool := C.CString(pool) defer C.free(unsafe.Pointer(c_pool)) ioctx := &IOContext{} ret := C.rados_ioctx_create(c.cluster, c_pool, &ioctx.ioctx) if ret == 0 { return ioctx, nil } return nil, getError(ret) } // ListPools returns the names of all existing pools. func (c *Conn) ListPools() (names []string, err error) { buf := make([]byte, 4096) for { ret := C.rados_pool_list(c.cluster, (*C.char)(unsafe.Pointer(&buf[0])), C.size_t(len(buf))) if ret < 0 { return nil, getError(ret) } if int(ret) > len(buf) { buf = make([]byte, ret) continue } tmp := bytes.SplitAfter(buf[:ret-1], []byte{0}) for _, s := range tmp { if len(s) > 0 { name := C.GoString((*C.char)(unsafe.Pointer(&s[0]))) names = append(names, name) } } return names, nil } } // SetConfigOption sets the value of the configuration option identified by // the given name. func (c *Conn) SetConfigOption(option, value string) error { c_opt, c_val := C.CString(option), C.CString(value) defer C.free(unsafe.Pointer(c_opt)) defer C.free(unsafe.Pointer(c_val)) ret := C.rados_conf_set(c.cluster, c_opt, c_val) return getError(ret) } // GetConfigOption returns the value of the Ceph configuration option // identified by the given name. func (c *Conn) GetConfigOption(name string) (value string, err error) { cOption := C.CString(name) defer C.free(unsafe.Pointer(cOption)) var buf []byte // range from 4k to 256KiB retry.WithSizes(4096, 1<<18, func(size int) retry.Hint { buf = make([]byte, size) ret := C.rados_conf_get( c.cluster, cOption, (*C.char)(unsafe.Pointer(&buf[0])), C.size_t(len(buf))) err = getError(ret) return retry.DoubleSize.If(err == errNameTooLong) }) if err != nil { return "", err } value = C.GoString((*C.char)(unsafe.Pointer(&buf[0]))) return value, nil } // WaitForLatestOSDMap blocks the caller until the latest OSD map has been // retrieved. func (c *Conn) WaitForLatestOSDMap() error { ret := C.rados_wait_for_latest_osdmap(c.cluster) return getError(ret) } func (c *Conn) ensure_connected() error { if c.connected { return nil } return ErrNotConnected } // GetClusterStats returns statistics about the cluster associated with the // connection. func (c *Conn) GetClusterStats() (stat ClusterStat, err error) { if err := c.ensure_connected(); err != nil { return ClusterStat{}, err } c_stat := C.struct_rados_cluster_stat_t{} ret := C.rados_cluster_stat(c.cluster, &c_stat) if ret < 0 { return ClusterStat{}, getError(ret) } return ClusterStat{ Kb: uint64(c_stat.kb), Kb_used: uint64(c_stat.kb_used), Kb_avail: uint64(c_stat.kb_avail), Num_objects: uint64(c_stat.num_objects), }, nil } // ParseCmdLineArgs configures the connection from command line arguments. func (c *Conn) ParseCmdLineArgs(args []string) error { // add an empty element 0 -- Ceph treats the array as the actual contents // of argv and skips the first element (the executable name) argc := C.int(len(args) + 1) argv := make([]*C.char, argc) // make the first element a string just in case it is ever examined argv[0] = C.CString("placeholder") defer C.free(unsafe.Pointer(argv[0])) for i, arg := range args { argv[i+1] = C.CString(arg) defer C.free(unsafe.Pointer(argv[i+1])) } ret := C.rados_conf_parse_argv(c.cluster, argc, &argv[0]) return getError(ret) } // ParseDefaultConfigEnv configures the connection from the default Ceph // environment variable(s). func (c *Conn) ParseDefaultConfigEnv() error { ret := C.rados_conf_parse_env(c.cluster, nil) return getError(ret) } // GetFSID returns the fsid of the cluster as a hexadecimal string. The fsid // is a unique identifier of an entire Ceph cluster. func (c *Conn) GetFSID() (fsid string, err error) { buf := make([]byte, 37) ret := C.rados_cluster_fsid(c.cluster, (*C.char)(unsafe.Pointer(&buf[0])), C.size_t(len(buf))) // FIXME: the success case isn't documented correctly in librados.h if ret == 36 { fsid = C.GoString((*C.char)(unsafe.Pointer(&buf[0]))) return fsid, nil } return "", getError(ret) } // GetInstanceID returns a globally unique identifier for the cluster // connection instance. func (c *Conn) GetInstanceID() uint64 { // FIXME: are there any error cases for this? return uint64(C.rados_get_instance_id(c.cluster)) } // MakePool creates a new pool with default settings. func (c *Conn) MakePool(name string) error { c_name := C.CString(name) defer C.free(unsafe.Pointer(c_name)) ret := C.rados_pool_create(c.cluster, c_name) return getError(ret) } // DeletePool deletes a pool and all the data inside the pool. func (c *Conn) DeletePool(name string) error { if err := c.ensure_connected(); err != nil { return err } c_name := C.CString(name) defer C.free(unsafe.Pointer(c_name)) ret := C.rados_pool_delete(c.cluster, c_name) return getError(ret) } // GetPoolByName returns the ID of the pool with a given name. func (c *Conn) GetPoolByName(name string) (int64, error) { if err := c.ensure_connected(); err != nil { return 0, err } c_name := C.CString(name) defer C.free(unsafe.Pointer(c_name)) ret := int64(C.rados_pool_lookup(c.cluster, c_name)) if ret < 0 { return 0, RadosError(ret) } return ret, nil } // GetPoolByID returns the name of a pool by a given ID. func (c *Conn) GetPoolByID(id int64) (string, error) { buf := make([]byte, 4096) if err := c.ensure_connected(); err != nil { return "", err } c_id := C.int64_t(id) ret := int(C.rados_pool_reverse_lookup(c.cluster, c_id, (*C.char)(unsafe.Pointer(&buf[0])), C.size_t(len(buf)))) if ret < 0 { return "", RadosError(ret) } return C.GoString((*C.char)(unsafe.Pointer(&buf[0]))), nil }