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138 lines
3.8 KiB
Go
138 lines
3.8 KiB
Go
package rados
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// #cgo LDFLAGS: -lrados
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// #include <errno.h>
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// #include <stdlib.h>
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// #include <rados/librados.h>
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import "C"
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import (
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"fmt"
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"runtime"
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"unsafe"
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"github.com/ceph/go-ceph/errutil"
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)
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// RadosError represents an error condition returned from the Ceph RADOS APIs.
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type RadosError int
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// Error returns the error string for the RadosError type.
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func (e RadosError) Error() string {
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errno, s := errutil.FormatErrno(int(e))
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if s == "" {
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return fmt.Sprintf("rados: ret=%d", errno)
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}
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return fmt.Sprintf("rados: ret=%d, %s", errno, s)
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}
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const (
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// AllNamespaces is used to reset a selected namespace to all
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// namespaces. See the IOContext SetNamespace function.
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AllNamespaces = C.LIBRADOS_ALL_NSPACES
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// ErrNotFound indicates a missing resource.
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ErrNotFound = RadosError(-C.ENOENT)
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// ErrPermissionDenied indicates a permissions issue.
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ErrPermissionDenied = RadosError(-C.EPERM)
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// ErrObjectExists indicates that an exclusive object creation failed.
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ErrObjectExists = RadosError(-C.EEXIST)
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// FIXME: for backwards compatibility
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// RadosAllNamespaces is used to reset a selected namespace to all
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// namespaces. See the IOContext SetNamespace function.
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//
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// Deprecated: use AllNamespaces instead
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RadosAllNamespaces = AllNamespaces
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// RadosErrorNotFound indicates a missing resource.
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//
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// Deprecated: use ErrNotFound instead
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RadosErrorNotFound = ErrNotFound
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// RadosErrorPermissionDenied indicates a permissions issue.
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//
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// Deprecated: use ErrPermissionDenied instead
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RadosErrorPermissionDenied = ErrPermissionDenied
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)
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func getRadosError(err int) error {
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if err == 0 {
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return nil
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}
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return RadosError(err)
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}
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// Version returns the major, minor, and patch components of the version of
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// the RADOS library linked against.
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func Version() (int, int, int) {
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var c_major, c_minor, c_patch C.int
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C.rados_version(&c_major, &c_minor, &c_patch)
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return int(c_major), int(c_minor), int(c_patch)
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}
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func makeConn() *Conn {
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return &Conn{connected: false}
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}
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func newConn(user *C.char) (*Conn, error) {
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conn := makeConn()
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ret := C.rados_create(&conn.cluster, user)
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if ret != 0 {
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return nil, RadosError(int(ret))
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}
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runtime.SetFinalizer(conn, freeConn)
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return conn, nil
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}
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// NewConn creates a new connection object. It returns the connection and an
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// error, if any.
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func NewConn() (*Conn, error) {
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return newConn(nil)
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}
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// NewConnWithUser creates a new connection object with a custom username.
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// It returns the connection and an error, if any.
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func NewConnWithUser(user string) (*Conn, error) {
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c_user := C.CString(user)
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defer C.free(unsafe.Pointer(c_user))
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return newConn(c_user)
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}
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// NewConnWithClusterAndUser creates a new connection object for a specific cluster and username.
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// It returns the connection and an error, if any.
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func NewConnWithClusterAndUser(clusterName string, userName string) (*Conn, error) {
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c_cluster_name := C.CString(clusterName)
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defer C.free(unsafe.Pointer(c_cluster_name))
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c_name := C.CString(userName)
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defer C.free(unsafe.Pointer(c_name))
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conn := makeConn()
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ret := C.rados_create2(&conn.cluster, c_cluster_name, c_name, 0)
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if ret != 0 {
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return nil, RadosError(int(ret))
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}
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runtime.SetFinalizer(conn, freeConn)
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return conn, nil
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}
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// freeConn releases resources that are allocated while configuring the
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// connection to the cluster. rados_shutdown() should only be needed after a
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// successful call to rados_connect(), however if the connection has been
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// configured with non-default parameters, some of the parameters may be
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// allocated before connecting. rados_shutdown() will free the allocated
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// resources, even if there has not been a connection yet.
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//
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// This function is setup as a destructor/finalizer when rados_create() is
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// called.
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func freeConn(conn *Conn) {
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if conn.cluster != nil {
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C.rados_shutdown(conn.cluster)
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// prevent calling rados_shutdown() more than once
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conn.cluster = nil
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}
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}
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