--- /dev/null
+/*
+ * Amanda, The Advanced Maryland Automatic Network Disk Archiver
+ * Copyright (c) 2009 Zmanda, Inc. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Contact information: Zmanda Inc., 465 S. Mathilda Ave., Suite 300
+ * Sunnyvale, CA 94085, USA, or: http://www.zmanda.com
+ */
+
+#include "amanda.h"
+#include "xfer-server.h"
+#include "xfer-device.h"
+
+/*
+ * Class declaration
+ *
+ * This declaration is entirely private; nothing but xfer_source_holding() references
+ * it directly.
+ */
+
+GType xfer_source_holding_get_type(void);
+#define XFER_SOURCE_HOLDING_TYPE (xfer_source_holding_get_type())
+#define XFER_SOURCE_HOLDING(obj) G_TYPE_CHECK_INSTANCE_CAST((obj), xfer_source_holding_get_type(), XferSourceHolding)
+#define XFER_SOURCE_HOLDING_CONST(obj) G_TYPE_CHECK_INSTANCE_CAST((obj), xfer_source_holding_get_type(), XferSourceHolding const)
+#define XFER_SOURCE_HOLDING_CLASS(klass) G_TYPE_CHECK_CLASS_CAST((klass), xfer_source_holding_get_type(), XferSourceHoldingClass)
+#define IS_XFER_SOURCE_HOLDING(obj) G_TYPE_CHECK_INSTANCE_TYPE((obj), xfer_source_holding_get_type ())
+#define XFER_SOURCE_HOLDING_GET_CLASS(obj) G_TYPE_INSTANCE_GET_CLASS((obj), xfer_source_holding_get_type(), XferSourceHoldingClass)
+
+static GObjectClass *parent_class = NULL;
+
+/*
+ * Main object structure
+ */
+
+typedef struct XferSourceHolding {
+ XferElement __parent__;
+
+ int fd;
+ char *next_filename;
+
+ XferElement *dest_taper;
+} XferSourceHolding;
+
+/*
+ * Class definition
+ */
+
+typedef struct {
+ XferElementClass __parent__;
+} XferSourceHoldingClass;
+
+/*
+ * Implementation
+ */
+
+static gboolean
+start_new_chunk(
+ XferSourceHolding *self)
+{
+ char *hdrbuf = NULL;
+ dumpfile_t hdr;
+ size_t bytes_read;
+
+ /* try to close an already-open file */
+ if (self->fd != -1) {
+ if (close(self->fd) < 0) {
+ xfer_cancel_with_error(XFER_ELEMENT(self),
+ "while closing holding file: %s", strerror(errno));
+ wait_until_xfer_cancelled(XFER_ELEMENT(self)->xfer);
+ return FALSE;
+ }
+
+ self->fd = -1;
+ }
+
+ /* if we have no next filename, then we're at EOF */
+ if (!self->next_filename) {
+ return FALSE;
+ }
+
+ /* otherwise, open up the next file */
+ self->fd = open(self->next_filename, O_RDONLY);
+ if (self->fd < 0) {
+ xfer_cancel_with_error(XFER_ELEMENT(self),
+ "while opening holding file '%s': %s",
+ self->next_filename, strerror(errno));
+ wait_until_xfer_cancelled(XFER_ELEMENT(self)->xfer);
+ return FALSE;
+ }
+
+ /* get a downstream XferDestTaper, if one exists. This check happens
+ * for each chunk, but chunks are large, so that's OK. */
+ if (!self->dest_taper) {
+ XferElement *elt = (XferElement *)self;
+
+ /* the xfer may have inserted glue between this element and
+ * the XferDestTaper. Glue does not change the bytestream, so
+ * it does not interfere with cache_inform calls. */
+ XferElement *iter = elt->downstream;
+ while (iter && IS_XFER_ELEMENT_GLUE(iter)) {
+ iter = iter->downstream;
+ }
+ if (IS_XFER_DEST_TAPER(iter))
+ self->dest_taper = iter;
+ }
+
+ /* tell a XferDestTaper about the new file */
+ if (self->dest_taper) {
+ struct stat st;
+ if (fstat(self->fd, &st) < 0) {
+ xfer_cancel_with_error(XFER_ELEMENT(self),
+ "while finding size of holding file '%s': %s",
+ self->next_filename, strerror(errno));
+ wait_until_xfer_cancelled(XFER_ELEMENT(self)->xfer);
+ return FALSE;
+ }
+
+ xfer_dest_taper_cache_inform(self->dest_taper,
+ self->next_filename,
+ DISK_BLOCK_BYTES,
+ st.st_size - DISK_BLOCK_BYTES);
+ }
+
+ /* read the header from the file and determine the filename of the next chunk */
+ hdrbuf = g_malloc(DISK_BLOCK_BYTES);
+ bytes_read = full_read(self->fd, hdrbuf, DISK_BLOCK_BYTES);
+ if (bytes_read < DISK_BLOCK_BYTES) {
+ g_free(hdrbuf);
+ xfer_cancel_with_error(XFER_ELEMENT(self),
+ "while reading header from holding file '%s': %s",
+ self->next_filename, strerror(errno));
+ wait_until_xfer_cancelled(XFER_ELEMENT(self)->xfer);
+ return FALSE;
+ }
+
+ parse_file_header(hdrbuf, &hdr, DISK_BLOCK_BYTES);
+ g_free(hdrbuf);
+ hdrbuf = NULL;
+
+ if (hdr.type != F_DUMPFILE && hdr.type != F_CONT_DUMPFILE) {
+ dumpfile_free_data(&hdr);
+ xfer_cancel_with_error(XFER_ELEMENT(self),
+ "unexpected header type %d in holding file '%s'",
+ hdr.type, self->next_filename);
+ wait_until_xfer_cancelled(XFER_ELEMENT(self)->xfer);
+ return FALSE;
+ }
+
+ g_free(self->next_filename);
+ if (hdr.cont_filename[0]) {
+ self->next_filename = g_strdup(hdr.cont_filename);
+ } else {
+ self->next_filename = NULL;
+ }
+ dumpfile_free_data(&hdr);
+
+ return TRUE;
+}
+
+/* pick an arbitrary block size for reading */
+#define HOLDING_BLOCK_SIZE (1024*128)
+
+static gpointer
+pull_buffer_impl(
+ XferElement *elt,
+ size_t *size)
+{
+ XferSourceHolding *self = (XferSourceHolding *)elt;
+ char *buf = NULL;
+ size_t bytes_read;
+
+ if (elt->cancelled)
+ goto return_eof;
+
+ if (self->fd == -1) {
+ if (!start_new_chunk(self))
+ goto return_eof;
+ }
+
+ buf = g_malloc(HOLDING_BLOCK_SIZE);
+
+ while (1) {
+ bytes_read = full_read(self->fd, buf, HOLDING_BLOCK_SIZE);
+ if (bytes_read > 0) {
+ *size = bytes_read;
+ return buf;
+ }
+
+ /* did an error occur? */
+ if (errno != 0) {
+ xfer_cancel_with_error(XFER_ELEMENT(self),
+ "while reading holding file: %s", strerror(errno));
+ wait_until_xfer_cancelled(XFER_ELEMENT(self)->xfer);
+ goto return_eof;
+ }
+
+ if (!start_new_chunk(self))
+ goto return_eof;
+ }
+
+return_eof:
+ g_free(buf);
+ *size = 0;
+ return NULL;
+}
+
+static void
+instance_init(
+ XferElement *elt)
+{
+ XferSourceHolding *self = (XferSourceHolding *)elt;
+
+ elt->can_generate_eof = TRUE;
+ self->fd = -1;
+}
+
+static void
+finalize_impl(
+ GObject * obj_self)
+{
+ XferSourceHolding *self = (XferSourceHolding *)obj_self;
+
+ if (self->next_filename)
+ g_free(self->next_filename);
+
+ if (self->fd != -1)
+ close(self->fd); /* ignore error; we were probably already cancelled */
+
+ G_OBJECT_CLASS(parent_class)->finalize(obj_self);
+}
+
+static void
+class_init(
+ XferSourceHoldingClass * selfc)
+{
+ XferElementClass *klass = XFER_ELEMENT_CLASS(selfc);
+ GObjectClass *goc = G_OBJECT_CLASS(selfc);
+ static xfer_element_mech_pair_t mech_pairs[] = {
+ { XFER_MECH_NONE, XFER_MECH_PULL_BUFFER, 1, 0},
+ { XFER_MECH_NONE, XFER_MECH_NONE, 0, 0},
+ };
+
+ klass->pull_buffer = pull_buffer_impl;
+
+ klass->perl_class = "Amanda::Xfer::Source::Holding";
+ klass->mech_pairs = mech_pairs;
+
+ goc->finalize = finalize_impl;
+
+ parent_class = g_type_class_peek_parent(selfc);
+}
+
+GType
+xfer_source_holding_get_type (void)
+{
+ static GType type = 0;
+
+ if G_UNLIKELY(type == 0) {
+ static const GTypeInfo info = {
+ sizeof (XferSourceHoldingClass),
+ (GBaseInitFunc) NULL,
+ (GBaseFinalizeFunc) NULL,
+ (GClassInitFunc) class_init,
+ (GClassFinalizeFunc) NULL,
+ NULL /* class_data */,
+ sizeof (XferSourceHolding),
+ 0 /* n_preallocs */,
+ (GInstanceInitFunc) instance_init,
+ NULL
+ };
+
+ type = g_type_register_static (XFER_ELEMENT_TYPE, "XferSourceHolding", &info, 0);
+ }
+
+ return type;
+}
+
+/* create an element of this class; prototype is in xfer-element.h */
+XferElement *
+xfer_source_holding(
+ const char *filename)
+{
+ XferSourceHolding *self = (XferSourceHolding *)g_object_new(XFER_SOURCE_HOLDING_TYPE, NULL);
+ XferElement *elt = XFER_ELEMENT(self);
+
+ self->next_filename = g_strdup(filename);
+
+ return elt;
+}
+
projects / debian / amanda / blobdiff