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streaming: propagate final object type via the stream 

When opening the read stream for a specific object the caller is also
expected to pass in a pointer to the object type. This type is passed
down via multiple levels and will eventually be populated with the type
of the looked-up object.

The way we propagate down the pointer though is somewhat non-obvious.
While `istream_source()` still expects the pointer and looks it up via
`odb_read_object_info_extended()`, we also pass it down even further
into the format-specific callbacks that perform another lookup. This is
quite confusing overall.

Refactor the code so that the responsibility to populate the object type
rests solely with the format-specific callbacks. This will allow us to
drop the call to `odb_read_object_info_extended()` in `istream_source()`
entirely in a subsequent patch.

Furthermore, instead of propagating the type via an in-pointer, we now
propagate the type via a new field in the object stream. It already has
a `size` field, so it's only natural to have a second field that
contains the object type.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
main
Patrick Steinhardt 2025-11-23 19:59:28 +01:00 committed by Junio C Hamano
parent 70c8b5f545
commit 3f64deabdf
1 changed files with 15 additions and 15 deletions
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30
streaming.c
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@ -33,6 +33,7 @@ struct odb_read_stream {
close_istream_fn close;
read_istream_fn read;

enum object_type type;
unsigned long size; /* inflated size of full object */
git_zstream z;
enum { z_unused, z_used, z_done, z_error } z_state;
@ -159,6 +160,7 @@ static struct odb_read_stream *attach_stream_filter(struct odb_read_stream *st,
fs->o_end = fs->o_ptr = 0;
fs->input_finished = 0;
ifs->size = -1; /* unknown */
ifs->type = st->type;
return ifs;
}

@ -221,14 +223,13 @@ static int close_istream_loose(struct odb_read_stream *st)
}

static int open_istream_loose(struct odb_read_stream *st, struct repository *r,
const struct object_id *oid,
enum object_type *type)
const struct object_id *oid)
{
struct object_info oi = OBJECT_INFO_INIT;
struct odb_source *source;

oi.sizep = &st->size;
oi.typep = type;
oi.typep = &st->type;

odb_prepare_alternates(r->objects);
for (source = r->objects->sources; source; source = source->next) {
@ -249,7 +250,7 @@ static int open_istream_loose(struct odb_read_stream *st, struct repository *r,
case ULHR_TOO_LONG:
goto error;
}
if (parse_loose_header(st->u.loose.hdr, &oi) < 0 || *type < 0)
if (parse_loose_header(st->u.loose.hdr, &oi) < 0 || st->type < 0)
goto error;

st->u.loose.hdr_used = strlen(st->u.loose.hdr) + 1;
@ -339,8 +340,7 @@ static int close_istream_pack_non_delta(struct odb_read_stream *st)

static int open_istream_pack_non_delta(struct odb_read_stream *st,
struct repository *r UNUSED,
const struct object_id *oid UNUSED,
enum object_type *type UNUSED)
const struct object_id *oid UNUSED)
{
struct pack_window *window;
enum object_type in_pack_type;
@ -361,6 +361,7 @@ static int open_istream_pack_non_delta(struct odb_read_stream *st,
case OBJ_TAG:
break;
}
st->type = in_pack_type;
st->z_state = z_unused;
st->close = close_istream_pack_non_delta;
st->read = read_istream_pack_non_delta;
@ -396,7 +397,7 @@ static ssize_t read_istream_incore(struct odb_read_stream *st, char *buf, size_t
}

static int open_istream_incore(struct odb_read_stream *st, struct repository *r,
const struct object_id *oid, enum object_type *type)
const struct object_id *oid)
{
struct object_info oi = OBJECT_INFO_INIT;

@ -404,7 +405,7 @@ static int open_istream_incore(struct odb_read_stream *st, struct repository *r,
st->close = close_istream_incore;
st->read = read_istream_incore;

oi.typep = type;
oi.typep = &st->type;
oi.sizep = &st->size;
oi.contentp = (void **)&st->u.incore.buf;
return odb_read_object_info_extended(r->objects, oid, &oi,
@ -417,14 +418,12 @@ static int open_istream_incore(struct odb_read_stream *st, struct repository *r,

static int istream_source(struct odb_read_stream *st,
struct repository *r,
const struct object_id *oid,
enum object_type *type)
const struct object_id *oid)
{
unsigned long size;
int status;
struct object_info oi = OBJECT_INFO_INIT;

oi.typep = type;
oi.sizep = &size;
status = odb_read_object_info_extended(r->objects, oid, &oi, 0);
if (status < 0)
@ -432,7 +431,7 @@ static int istream_source(struct odb_read_stream *st,

switch (oi.whence) {
case OI_LOOSE:
if (open_istream_loose(st, r, oid, type) < 0)
if (open_istream_loose(st, r, oid) < 0)
break;
return 0;
case OI_PACKED:
@ -442,7 +441,7 @@ static int istream_source(struct odb_read_stream *st,

st->u.in_pack.pack = oi.u.packed.pack;
st->u.in_pack.pos = oi.u.packed.offset;
if (open_istream_pack_non_delta(st, r, oid, type) < 0)
if (open_istream_pack_non_delta(st, r, oid) < 0)
break;

return 0;
@ -450,7 +449,7 @@ static int istream_source(struct odb_read_stream *st,
break;
}

return open_istream_incore(st, r, oid, type);
return open_istream_incore(st, r, oid);
}

/****************************************************************
@ -477,7 +476,7 @@ struct odb_read_stream *open_istream(struct repository *r,
{
struct odb_read_stream *st = xmalloc(sizeof(*st));
const struct object_id *real = lookup_replace_object(r, oid);
int ret = istream_source(st, r, real, type);
int ret = istream_source(st, r, real);

if (ret) {
free(st);
@ -495,6 +494,7 @@ struct odb_read_stream *open_istream(struct repository *r,
}

*size = st->size;
*type = st->type;
return st;
}