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From: "Han-Wen Nienhuys via GitGitGadget" <gitgitgadget@gmail.com>
To: git@vger.kernel.org
Cc: "Han-Wen Nienhuys" <hanwen@google.com>,
	"Carlo Marcelo Arenas Belón" <carenas@gmail.com>,
	"Han-Wen Nienhuys" <hanwenn@gmail.com>,
	"Han-Wen Nienhuys" <hanwen@google.com>
Subject: [PATCH v2 05/19] reftable: add blocksource, an abstraction for random access reads
Date: Thu, 09 Sep 2021 18:47:30 +0000	[thread overview]
Message-ID: <e9206532126ea165abb3ebd157ae3b0750e865cc.1631213265.git.gitgitgadget@gmail.com> (raw)
In-Reply-To: <pull.1081.v2.git.git.1631213264.gitgitgadget@gmail.com>

From: Han-Wen Nienhuys <hanwen@google.com>

The reftable format is usually used with files for storage. However, we abstract
away this using the blocksource data structure. This has two advantages:

* log blocks are zlib compressed, and handling them is simplified if we can
  discard byte segments from within the block layer.

* for unittests, it is useful to read and write in-memory. The blocksource
  allows us to abstract the data away from on-disk files.

Signed-off-by: Han-Wen Nienhuys <hanwen@google.com>
---
 Makefile                        |   1 +
 reftable/blocksource.c          | 148 ++++++++++++++++++++++++++++++++
 reftable/blocksource.h          |  22 +++++
 reftable/reftable-blocksource.h |  49 +++++++++++
 4 files changed, 220 insertions(+)
 create mode 100644 reftable/blocksource.c
 create mode 100644 reftable/blocksource.h
 create mode 100644 reftable/reftable-blocksource.h

diff --git a/Makefile b/Makefile
index 0bf5e49aa61..c7ffc27a727 100644
--- a/Makefile
+++ b/Makefile
@@ -2451,6 +2451,7 @@ xdiff-objs: $(XDIFF_OBJS)
 
 REFTABLE_OBJS += reftable/basics.o
 REFTABLE_OBJS += reftable/error.o
+REFTABLE_OBJS += reftable/blocksource.o
 REFTABLE_OBJS += reftable/publicbasics.o
 
 REFTABLE_TEST_OBJS += reftable/test_framework.o
diff --git a/reftable/blocksource.c b/reftable/blocksource.c
new file mode 100644
index 00000000000..0044eecd9aa
--- /dev/null
+++ b/reftable/blocksource.c
@@ -0,0 +1,148 @@
+/*
+Copyright 2020 Google LLC
+
+Use of this source code is governed by a BSD-style
+license that can be found in the LICENSE file or at
+https://developers.google.com/open-source/licenses/bsd
+*/
+
+#include "system.h"
+
+#include "basics.h"
+#include "blocksource.h"
+#include "reftable-blocksource.h"
+#include "reftable-error.h"
+
+static void strbuf_return_block(void *b, struct reftable_block *dest)
+{
+	memset(dest->data, 0xff, dest->len);
+	reftable_free(dest->data);
+}
+
+static void strbuf_close(void *b)
+{
+}
+
+static int strbuf_read_block(void *v, struct reftable_block *dest, uint64_t off,
+			     uint32_t size)
+{
+	struct strbuf *b = v;
+	assert(off + size <= b->len);
+	dest->data = reftable_calloc(size);
+	memcpy(dest->data, b->buf + off, size);
+	dest->len = size;
+	return size;
+}
+
+static uint64_t strbuf_size(void *b)
+{
+	return ((struct strbuf *)b)->len;
+}
+
+static struct reftable_block_source_vtable strbuf_vtable = {
+	.size = &strbuf_size,
+	.read_block = &strbuf_read_block,
+	.return_block = &strbuf_return_block,
+	.close = &strbuf_close,
+};
+
+void block_source_from_strbuf(struct reftable_block_source *bs,
+			      struct strbuf *buf)
+{
+	assert(!bs->ops);
+	bs->ops = &strbuf_vtable;
+	bs->arg = buf;
+}
+
+static void malloc_return_block(void *b, struct reftable_block *dest)
+{
+	memset(dest->data, 0xff, dest->len);
+	reftable_free(dest->data);
+}
+
+static struct reftable_block_source_vtable malloc_vtable = {
+	.return_block = &malloc_return_block,
+};
+
+static struct reftable_block_source malloc_block_source_instance = {
+	.ops = &malloc_vtable,
+};
+
+struct reftable_block_source malloc_block_source(void)
+{
+	return malloc_block_source_instance;
+}
+
+struct file_block_source {
+	int fd;
+	uint64_t size;
+};
+
+static uint64_t file_size(void *b)
+{
+	return ((struct file_block_source *)b)->size;
+}
+
+static void file_return_block(void *b, struct reftable_block *dest)
+{
+	memset(dest->data, 0xff, dest->len);
+	reftable_free(dest->data);
+}
+
+static void file_close(void *b)
+{
+	int fd = ((struct file_block_source *)b)->fd;
+	if (fd > 0) {
+		close(fd);
+		((struct file_block_source *)b)->fd = 0;
+	}
+
+	reftable_free(b);
+}
+
+static int file_read_block(void *v, struct reftable_block *dest, uint64_t off,
+			   uint32_t size)
+{
+	struct file_block_source *b = v;
+	assert(off + size <= b->size);
+	dest->data = reftable_malloc(size);
+	if (pread(b->fd, dest->data, size, off) != size)
+		return -1;
+	dest->len = size;
+	return size;
+}
+
+static struct reftable_block_source_vtable file_vtable = {
+	.size = &file_size,
+	.read_block = &file_read_block,
+	.return_block = &file_return_block,
+	.close = &file_close,
+};
+
+int reftable_block_source_from_file(struct reftable_block_source *bs,
+				    const char *name)
+{
+	struct stat st = { 0 };
+	int err = 0;
+	int fd = open(name, O_RDONLY);
+	struct file_block_source *p = NULL;
+	if (fd < 0) {
+		if (errno == ENOENT) {
+			return REFTABLE_NOT_EXIST_ERROR;
+		}
+		return -1;
+	}
+
+	err = fstat(fd, &st);
+	if (err < 0)
+		return -1;
+
+	p = reftable_calloc(sizeof(struct file_block_source));
+	p->size = st.st_size;
+	p->fd = fd;
+
+	assert(!bs->ops);
+	bs->ops = &file_vtable;
+	bs->arg = p;
+	return 0;
+}
diff --git a/reftable/blocksource.h b/reftable/blocksource.h
new file mode 100644
index 00000000000..072e2727ad2
--- /dev/null
+++ b/reftable/blocksource.h
@@ -0,0 +1,22 @@
+/*
+Copyright 2020 Google LLC
+
+Use of this source code is governed by a BSD-style
+license that can be found in the LICENSE file or at
+https://developers.google.com/open-source/licenses/bsd
+*/
+
+#ifndef BLOCKSOURCE_H
+#define BLOCKSOURCE_H
+
+#include "system.h"
+
+struct reftable_block_source;
+
+/* Create an in-memory block source for reading reftables */
+void block_source_from_strbuf(struct reftable_block_source *bs,
+			      struct strbuf *buf);
+
+struct reftable_block_source malloc_block_source(void);
+
+#endif
diff --git a/reftable/reftable-blocksource.h b/reftable/reftable-blocksource.h
new file mode 100644
index 00000000000..5aa3990a573
--- /dev/null
+++ b/reftable/reftable-blocksource.h
@@ -0,0 +1,49 @@
+/*
+Copyright 2020 Google LLC
+
+Use of this source code is governed by a BSD-style
+license that can be found in the LICENSE file or at
+https://developers.google.com/open-source/licenses/bsd
+*/
+
+#ifndef REFTABLE_BLOCKSOURCE_H
+#define REFTABLE_BLOCKSOURCE_H
+
+#include <stdint.h>
+
+/* block_source is a generic wrapper for a seekable readable file.
+ */
+struct reftable_block_source {
+	struct reftable_block_source_vtable *ops;
+	void *arg;
+};
+
+/* a contiguous segment of bytes. It keeps track of its generating block_source
+ * so it can return itself into the pool. */
+struct reftable_block {
+	uint8_t *data;
+	int len;
+	struct reftable_block_source source;
+};
+
+/* block_source_vtable are the operations that make up block_source */
+struct reftable_block_source_vtable {
+	/* returns the size of a block source */
+	uint64_t (*size)(void *source);
+
+	/* reads a segment from the block source. It is an error to read
+	   beyond the end of the block */
+	int (*read_block)(void *source, struct reftable_block *dest,
+			  uint64_t off, uint32_t size);
+	/* mark the block as read; may return the data back to malloc */
+	void (*return_block)(void *source, struct reftable_block *blockp);
+
+	/* release all resources associated with the block source */
+	void (*close)(void *source);
+};
+
+/* opens a file on the file system as a block_source */
+int reftable_block_source_from_file(struct reftable_block_source *block_src,
+				    const char *name);
+
+#endif
-- 
gitgitgadget


  parent reply	other threads:[~2021-09-09 18:51 UTC|newest]

Thread overview: 111+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-30 14:57 [PATCH 00/19] Adds reftable library code from https://github.com/hanwen/reftable Han-Wen Nienhuys via GitGitGadget
2021-08-30 14:57 ` [PATCH 01/19] hash.h: provide constants for the hash IDs Han-Wen Nienhuys via GitGitGadget
2021-08-30 14:57 ` [PATCH 02/19] reftable: RFC: add LICENSE Han-Wen Nienhuys via GitGitGadget
2021-08-30 14:57 ` [PATCH 03/19] reftable: add error related functionality Han-Wen Nienhuys via GitGitGadget
2021-08-30 14:57 ` [PATCH 04/19] reftable: utility functions Han-Wen Nienhuys via GitGitGadget
2021-08-30 14:57 ` [PATCH 05/19] reftable: add blocksource, an abstraction for random access reads Han-Wen Nienhuys via GitGitGadget
2021-08-30 14:57 ` [PATCH 06/19] reftable: (de)serialization for the polymorphic record type Han-Wen Nienhuys via GitGitGadget
2021-08-30 14:57 ` [PATCH 07/19] Provide zlib's uncompress2 from compat/zlib-compat.c Han-Wen Nienhuys via GitGitGadget
2021-09-02  6:12   ` [PATCH] fixup! " Carlo Marcelo Arenas Belón
2021-08-30 14:57 ` [PATCH 08/19] reftable: reading/writing blocks Han-Wen Nienhuys via GitGitGadget
2021-08-30 14:57 ` [PATCH 09/19] reftable: a generic binary tree implementation Han-Wen Nienhuys via GitGitGadget
2021-08-30 14:57 ` [PATCH 10/19] reftable: write reftable files Han-Wen Nienhuys via GitGitGadget
2021-08-30 14:57 ` [PATCH 11/19] reftable: generic interface to tables Han-Wen Nienhuys via GitGitGadget
2021-08-30 14:57 ` [PATCH 12/19] reftable: read reftable files Han-Wen Nienhuys via GitGitGadget
2021-08-30 14:57 ` [PATCH 13/19] reftable: reftable file level tests Han-Wen Nienhuys via GitGitGadget
2021-08-30 14:57 ` [PATCH 14/19] reftable: add a heap-based priority queue for reftable records Han-Wen Nienhuys via GitGitGadget
2021-08-30 14:57 ` [PATCH 15/19] reftable: add merged table view Han-Wen Nienhuys via GitGitGadget
2021-08-30 14:57 ` [PATCH 16/19] reftable: implement refname validation Han-Wen Nienhuys via GitGitGadget
2021-08-30 14:57 ` [PATCH 17/19] reftable: implement stack, a mutable database of reftable files Han-Wen Nienhuys via GitGitGadget
2021-08-30 14:57 ` [PATCH 18/19] reftable: add dump utility Han-Wen Nienhuys via GitGitGadget
2021-08-30 14:57 ` [PATCH 19/19] Add "test-tool dump-reftable" command Han-Wen Nienhuys via GitGitGadget
2021-08-30 15:22 ` [PATCH 00/19] Adds reftable library code from https://github.com/hanwen/reftable Han-Wen Nienhuys
2021-09-08  7:45 ` [PATCH 0/4] fixup for hn/reftable Carlo Marcelo Arenas Belón
2021-09-08  7:45   ` [PATCH 1/4] fixup! reftable: reading/writing blocks Carlo Marcelo Arenas Belón
2021-09-08  7:45   ` [PATCH 2/4] fixup! reftable: utility functions Carlo Marcelo Arenas Belón
2021-09-08  7:45   ` [PATCH 3/4] fixup! Provide zlib's uncompress2 from compat/zlib-compat.c Carlo Marcelo Arenas Belón
2021-09-08  7:45   ` [PATCH 4/4] fixup! reftable: utility functions Carlo Marcelo Arenas Belón
2021-09-08 18:50   ` [PATCH 0/4] fixup for hn/reftable Junio C Hamano
2021-09-09 18:47 ` [PATCH v2 00/19] Adds reftable library code from https://github.com/hanwen/reftable Han-Wen Nienhuys via GitGitGadget
2021-09-09 18:47   ` [PATCH v2 01/19] hash.h: provide constants for the hash IDs Han-Wen Nienhuys via GitGitGadget
2021-09-09 18:47   ` [PATCH v2 02/19] reftable: RFC: add LICENSE Han-Wen Nienhuys via GitGitGadget
2021-09-09 18:47   ` [PATCH v2 03/19] reftable: add error related functionality Han-Wen Nienhuys via GitGitGadget
2021-09-09 18:47   ` [PATCH v2 04/19] reftable: utility functions Han-Wen Nienhuys via GitGitGadget
2021-09-09 18:47   ` Han-Wen Nienhuys via GitGitGadget [this message]
2021-09-09 18:47   ` [PATCH v2 06/19] reftable: (de)serialization for the polymorphic record type Han-Wen Nienhuys via GitGitGadget
2021-09-09 18:47   ` [PATCH v2 07/19] Provide zlib's uncompress2 from compat/zlib-compat.c Han-Wen Nienhuys via GitGitGadget
2021-09-15  7:34     ` Carlo Arenas
2021-09-09 18:47   ` [PATCH v2 08/19] reftable: reading/writing blocks Han-Wen Nienhuys via GitGitGadget
2021-09-24 11:52     ` Ævar Arnfjörð Bjarmason
2021-09-09 18:47   ` [PATCH v2 09/19] reftable: a generic binary tree implementation Han-Wen Nienhuys via GitGitGadget
2021-09-09 18:47   ` [PATCH v2 10/19] reftable: write reftable files Han-Wen Nienhuys via GitGitGadget
2021-09-09 18:47   ` [PATCH v2 11/19] reftable: generic interface to tables Han-Wen Nienhuys via GitGitGadget
2021-09-09 18:47   ` [PATCH v2 12/19] reftable: read reftable files Han-Wen Nienhuys via GitGitGadget
2021-09-09 18:47   ` [PATCH v2 13/19] reftable: reftable file level tests Han-Wen Nienhuys via GitGitGadget
2021-09-09 18:47   ` [PATCH v2 14/19] reftable: add a heap-based priority queue for reftable records Han-Wen Nienhuys via GitGitGadget
2021-09-09 18:47   ` [PATCH v2 15/19] reftable: add merged table view Han-Wen Nienhuys via GitGitGadget
2021-09-09 18:47   ` [PATCH v2 16/19] reftable: implement refname validation Han-Wen Nienhuys via GitGitGadget
2021-09-09 18:47   ` [PATCH v2 17/19] reftable: implement stack, a mutable database of reftable files Han-Wen Nienhuys via GitGitGadget
2021-09-09 18:47   ` [PATCH v2 18/19] reftable: add dump utility Han-Wen Nienhuys via GitGitGadget
2021-09-09 18:47   ` [PATCH v2 19/19] Add "test-tool dump-reftable" command Han-Wen Nienhuys via GitGitGadget
2021-09-09 20:02   ` [PATCH v2 00/19] Adds reftable library code from https://github.com/hanwen/reftable Junio C Hamano
2021-09-09 20:32   ` Junio C Hamano
2021-09-13 10:14     ` Han-Wen Nienhuys
2021-09-13 18:30       ` Junio C Hamano
2021-09-13 19:29         ` Carlo Arenas
2021-09-13 20:34           ` Junio C Hamano
2021-09-28 15:09   ` [PATCH v3 " Han-Wen Nienhuys via GitGitGadget
2021-09-28 15:09     ` [PATCH v3 01/19] hash.h: provide constants for the hash IDs Han-Wen Nienhuys via GitGitGadget
2021-09-28 15:09     ` [PATCH v3 02/19] reftable: RFC: add LICENSE Han-Wen Nienhuys via GitGitGadget
2021-09-28 15:10     ` [PATCH v3 03/19] reftable: add error related functionality Han-Wen Nienhuys via GitGitGadget
2021-09-28 15:10     ` [PATCH v3 04/19] reftable: utility functions Han-Wen Nienhuys via GitGitGadget
2021-09-28 15:10     ` [PATCH v3 05/19] reftable: add blocksource, an abstraction for random access reads Han-Wen Nienhuys via GitGitGadget
2021-09-28 15:10     ` [PATCH v3 06/19] reftable: (de)serialization for the polymorphic record type Han-Wen Nienhuys via GitGitGadget
2021-09-28 15:10     ` [PATCH v3 07/19] Provide zlib's uncompress2 from compat/zlib-compat.c Han-Wen Nienhuys via GitGitGadget
2021-09-28 15:10     ` [PATCH v3 08/19] reftable: reading/writing blocks Han-Wen Nienhuys via GitGitGadget
2021-09-30 12:23       ` [PATCH] squash! " Carlo Marcelo Arenas Belón
2021-10-07 16:34         ` Han-Wen Nienhuys
2021-09-28 15:10     ` [PATCH v3 09/19] reftable: a generic binary tree implementation Han-Wen Nienhuys via GitGitGadget
2021-09-28 15:10     ` [PATCH v3 10/19] reftable: write reftable files Han-Wen Nienhuys via GitGitGadget
2021-09-28 15:10     ` [PATCH v3 11/19] reftable: generic interface to tables Han-Wen Nienhuys via GitGitGadget
2021-09-28 15:10     ` [PATCH v3 12/19] reftable: read reftable files Han-Wen Nienhuys via GitGitGadget
2021-09-28 15:10     ` [PATCH v3 13/19] reftable: reftable file level tests Han-Wen Nienhuys via GitGitGadget
2021-09-28 15:10     ` [PATCH v3 14/19] reftable: add a heap-based priority queue for reftable records Han-Wen Nienhuys via GitGitGadget
2021-09-28 15:10     ` [PATCH v3 15/19] reftable: add merged table view Han-Wen Nienhuys via GitGitGadget
2021-09-28 15:10     ` [PATCH v3 16/19] reftable: implement refname validation Han-Wen Nienhuys via GitGitGadget
2021-09-28 15:10     ` [PATCH v3 17/19] reftable: implement stack, a mutable database of reftable files Han-Wen Nienhuys via GitGitGadget
2021-09-28 15:10     ` [PATCH v3 18/19] reftable: add dump utility Han-Wen Nienhuys via GitGitGadget
2021-09-28 15:10     ` [PATCH v3 19/19] Add "test-tool dump-reftable" command Han-Wen Nienhuys via GitGitGadget
2021-09-28 18:17     ` [PATCH v3 00/19] Adds reftable library code from https://github.com/hanwen/reftable Junio C Hamano
2021-10-02  9:20       ` Ævar Arnfjörð Bjarmason
2021-09-30  5:40     ` hn/reftable "fixes" Carlo Marcelo Arenas Belón
2021-09-30  5:40       ` [PATCH 1/4] fixup! reftable: add a heap-based priority queue for reftable records Carlo Marcelo Arenas Belón
2021-09-30  5:40       ` [PATCH 2/4] fixup! reftable: implement stack, a mutable database of reftable files Carlo Marcelo Arenas Belón
2021-10-01 15:37         ` C++(C99)-style comments in git.git Ævar Arnfjörð Bjarmason
2021-09-30  5:40       ` [PATCH 3/4] config.mak.uname: last release and snapshots of Minix still use zlib 1.2.3 Carlo Marcelo Arenas Belón
2021-09-30  5:40       ` [PATCH 4/4] reftable: avoid non portable compile time pointer to function Carlo Marcelo Arenas Belón
2021-09-30 20:35       ` hn/reftable "fixes" Junio C Hamano
2021-10-07 20:24     ` [PATCH v4 00/19] Adds reftable library code from https://github.com/hanwen/reftable Han-Wen Nienhuys via GitGitGadget
2021-10-07 20:24       ` [PATCH v4 01/19] hash.h: provide constants for the hash IDs Han-Wen Nienhuys via GitGitGadget
2021-10-07 20:24       ` [PATCH v4 02/19] reftable: add LICENSE Han-Wen Nienhuys via GitGitGadget
2021-10-07 20:24       ` [PATCH v4 03/19] reftable: add error related functionality Han-Wen Nienhuys via GitGitGadget
2021-10-07 20:25       ` [PATCH v4 04/19] reftable: utility functions Han-Wen Nienhuys via GitGitGadget
2021-10-07 20:25       ` [PATCH v4 05/19] reftable: add blocksource, an abstraction for random access reads Han-Wen Nienhuys via GitGitGadget
2021-10-07 20:25       ` [PATCH v4 06/19] reftable: (de)serialization for the polymorphic record type Han-Wen Nienhuys via GitGitGadget
2021-10-07 20:25       ` [PATCH v4 07/19] Provide zlib's uncompress2 from compat/zlib-compat.c Han-Wen Nienhuys via GitGitGadget
2021-10-07 20:25       ` [PATCH v4 08/19] reftable: reading/writing blocks Han-Wen Nienhuys via GitGitGadget
2021-10-07 20:25       ` [PATCH v4 09/19] reftable: a generic binary tree implementation Han-Wen Nienhuys via GitGitGadget
2021-10-07 20:25       ` [PATCH v4 10/19] reftable: write reftable files Han-Wen Nienhuys via GitGitGadget
2021-10-07 20:25       ` [PATCH v4 11/19] reftable: generic interface to tables Han-Wen Nienhuys via GitGitGadget
2021-10-07 20:25       ` [PATCH v4 12/19] reftable: read reftable files Han-Wen Nienhuys via GitGitGadget
2021-10-07 20:25       ` [PATCH v4 13/19] reftable: reftable file level tests Han-Wen Nienhuys via GitGitGadget
2021-10-07 20:25       ` [PATCH v4 14/19] reftable: add a heap-based priority queue for reftable records Han-Wen Nienhuys via GitGitGadget
2021-10-07 20:25       ` [PATCH v4 15/19] reftable: add merged table view Han-Wen Nienhuys via GitGitGadget
2022-01-13 11:38         ` [PATCH] reftable tests: use C syntax compatible with old xlc Ævar Arnfjörð Bjarmason
2022-01-13 14:23           ` Han-Wen Nienhuys
2022-01-13 16:22             ` Ævar Arnfjörð Bjarmason
2022-01-13 19:09             ` Junio C Hamano
2021-10-07 20:25       ` [PATCH v4 16/19] reftable: implement refname validation Han-Wen Nienhuys via GitGitGadget
2021-10-07 20:25       ` [PATCH v4 17/19] reftable: implement stack, a mutable database of reftable files Han-Wen Nienhuys via GitGitGadget
2021-10-07 20:25       ` [PATCH v4 18/19] reftable: add dump utility Han-Wen Nienhuys via GitGitGadget
2021-10-07 20:25       ` [PATCH v4 19/19] Add "test-tool dump-reftable" command Han-Wen Nienhuys via GitGitGadget

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