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http*: add helper methods for fetching objects (loose) 

The code handling the fetching of loose objects in http-push.c and
http-walker.c have been refactored into new methods and a new struct
(object_http_request) in http.c. They are not meant to be invoked
elsewhere.

The new methods in http.c are
 - new_http_object_request
 - process_http_object_request
 - finish_http_object_request
 - abort_http_object_request
 - release_http_object_request

and the new struct is http_object_request.

RANGER_HEADER_SIZE and no_pragma_header is no longer made available
outside of http.c, since after the above changes, there are no other
instances of usage outside of http.c.

Remove members of the transfer_request struct in http-push.c and
http-walker.c, including filename, real_sha1 and zret, as they are used
no longer used.

Move the methods append_remote_object_url() and get_remote_object_url()
from http-push.c to http.c. Additionally, get_remote_object_url() is no
longer defined only when USE_CURL_MULTI is defined, since
non-USE_CURL_MULTI code in http.c uses it (namely, in
new_http_object_request()).

Refactor code from http-push.c::start_fetch_loose() and
http-walker.c::start_object_fetch_request() that deals with the details
of coming up with the filename to store the retrieved object, resuming
a previously aborted request, and making a new curl request, into a new
function, new_http_object_request().

Refactor code from http-walker.c::process_object_request() into the
function, process_http_object_request().

Refactor code from http-push.c::finish_request() and
http-walker.c::finish_object_request() into a new function,
finish_http_object_request(). It returns the result of the
move_temp_to_file() invocation.

Add a function, release_http_object_request(), which cleans up object
request data. http-push.c and http-walker.c invoke this function
separately; http-push.c::release_request() and
http-walker.c::release_object_request() do not invoke this function.

Add a function, abort_http_object_request(), which unlink()s the object
file and invokes release_http_object_request(). Update
http-walker.c::abort_object_request() to use this.

Signed-off-by: Tay Ray Chuan <rctay89@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
maint
Tay Ray Chuan 2009-06-06 16:44:02 +08:00 committed by Junio C Hamano
parent 2264dfa5c4
commit 5424bc557f
4 changed files with 335 additions and 430 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

209
http-push.c
View File

@ -115,18 +115,10 @@ struct transfer_request
struct remote_lock *lock;
struct curl_slist *headers;
struct buffer buffer;
char filename[PATH_MAX];
char tmpfile[PATH_MAX];
int local_fileno;
enum transfer_state state;
CURLcode curl_result;
char errorstr[CURL_ERROR_SIZE];
long http_code;
unsigned char real_sha1[20];
git_SHA_CTX c;
z_stream stream;
int zret;
int rename;
void *userData;
struct active_request_slot *slot;
struct transfer_request *next;
@ -232,15 +224,6 @@ static struct curl_slist *get_dav_token_headers(struct remote_lock *lock, enum d
return dav_headers;
}

static void append_remote_object_url(struct strbuf *buf, const char *url,
const char *hex,
int only_two_digit_prefix)
{
strbuf_addf(buf, "%sobjects/%.*s/", url, 2, hex);
if (!only_two_digit_prefix)
strbuf_addf(buf, "%s", hex+2);
}

static void finish_request(struct transfer_request *request);
static void release_request(struct transfer_request *request);

@ -254,169 +237,29 @@ static void process_response(void *callback_data)

#ifdef USE_CURL_MULTI

static char *get_remote_object_url(const char *url, const char *hex,
int only_two_digit_prefix)
{
struct strbuf buf = STRBUF_INIT;
append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
return strbuf_detach(&buf, NULL);
}

static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
void *data)
{
unsigned char expn[4096];
size_t size = eltsize * nmemb;
int posn = 0;
struct transfer_request *request = (struct transfer_request *)data;
do {
ssize_t retval = xwrite(request->local_fileno,
(char *) ptr + posn, size - posn);
if (retval < 0)
return posn;
posn += retval;
} while (posn < size);

request->stream.avail_in = size;
request->stream.next_in = ptr;
do {
request->stream.next_out = expn;
request->stream.avail_out = sizeof(expn);
request->zret = git_inflate(&request->stream, Z_SYNC_FLUSH);
git_SHA1_Update(&request->c, expn,
sizeof(expn) - request->stream.avail_out);
} while (request->stream.avail_in && request->zret == Z_OK);
data_received++;
return size;
}

static void start_fetch_loose(struct transfer_request *request)
{
char *hex = sha1_to_hex(request->obj->sha1);
char *filename;
char prevfile[PATH_MAX];
char *url;
int prevlocal;
unsigned char prev_buf[PREV_BUF_SIZE];
ssize_t prev_read = 0;
long prev_posn = 0;
char range[RANGE_HEADER_SIZE];
struct curl_slist *range_header = NULL;
struct active_request_slot *slot;
struct http_object_request *obj_req;

filename = sha1_file_name(request->obj->sha1);
snprintf(request->filename, sizeof(request->filename), "%s", filename);
snprintf(request->tmpfile, sizeof(request->tmpfile),
"%s.temp", filename);

snprintf(prevfile, sizeof(prevfile), "%s.prev", request->filename);
unlink_or_warn(prevfile);
rename(request->tmpfile, prevfile);
unlink_or_warn(request->tmpfile);

if (request->local_fileno != -1)
error("fd leakage in start: %d", request->local_fileno);
request->local_fileno = open(request->tmpfile,
O_WRONLY | O_CREAT | O_EXCL, 0666);
/*
* This could have failed due to the "lazy directory creation";
* try to mkdir the last path component.
*/
if (request->local_fileno < 0 && errno == ENOENT) {
char *dir = strrchr(request->tmpfile, '/');
if (dir) {
*dir = 0;
mkdir(request->tmpfile, 0777);
*dir = '/';
}
request->local_fileno = open(request->tmpfile,
O_WRONLY | O_CREAT | O_EXCL, 0666);
}

if (request->local_fileno < 0) {
obj_req = new_http_object_request(repo->url, request->obj->sha1);
if (obj_req == NULL) {
request->state = ABORTED;
error("Couldn't create temporary file %s for %s: %s",
request->tmpfile, request->filename, strerror(errno));
return;
}

memset(&request->stream, 0, sizeof(request->stream));

git_inflate_init(&request->stream);

git_SHA1_Init(&request->c);

url = get_remote_object_url(repo->url, hex, 0);
request->url = xstrdup(url);

/*
* If a previous temp file is present, process what was already
* fetched.
*/
prevlocal = open(prevfile, O_RDONLY);
if (prevlocal != -1) {
do {
prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
if (prev_read>0) {
if (fwrite_sha1_file(prev_buf,
1,
prev_read,
request) == prev_read)
prev_posn += prev_read;
else
prev_read = -1;
}
} while (prev_read > 0);
close(prevlocal);
}
unlink_or_warn(prevfile);

/*
* Reset inflate/SHA1 if there was an error reading the previous temp
* file; also rewind to the beginning of the local file.
*/
if (prev_read == -1) {
memset(&request->stream, 0, sizeof(request->stream));
git_inflate_init(&request->stream);
git_SHA1_Init(&request->c);
if (prev_posn>0) {
prev_posn = 0;
lseek(request->local_fileno, 0, SEEK_SET);
ftruncate(request->local_fileno, 0);
}
}

slot = get_active_slot();
slot = obj_req->slot;
slot->callback_func = process_response;
slot->callback_data = request;
request->slot = slot;

curl_easy_setopt(slot->curl, CURLOPT_FILE, request);
curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
curl_easy_setopt(slot->curl, CURLOPT_URL, url);
curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);

/*
* If we have successfully processed data from a previous fetch
* attempt, only fetch the data we don't already have.
*/
if (prev_posn>0) {
if (push_verbosely)
fprintf(stderr,
"Resuming fetch of object %s at byte %ld\n",
hex, prev_posn);
sprintf(range, "Range: bytes=%ld-", prev_posn);
range_header = curl_slist_append(range_header, range);
curl_easy_setopt(slot->curl,
CURLOPT_HTTPHEADER, range_header);
}
request->userData = obj_req;

/* Try to get the request started, abort the request on error */
request->state = RUN_FETCH_LOOSE;
if (!start_active_slot(slot)) {
fprintf(stderr, "Unable to start GET request\n");
repo->can_update_info_refs = 0;
release_http_object_request(obj_req);
release_request(request);
}
}
@ -675,16 +518,14 @@ static void release_request(struct transfer_request *request)
entry->next = entry->next->next;
}

if (request->local_fileno != -1)
close(request->local_fileno);
free(request->url);
free(request);
}

static void finish_request(struct transfer_request *request)
{
struct stat st;
struct http_pack_request *preq;
struct http_object_request *obj_req;

request->curl_result = request->slot->curl_result;
request->http_code = request->slot->http_code;
@ -739,39 +580,17 @@ static void finish_request(struct transfer_request *request)
aborted = 1;
}
} else if (request->state == RUN_FETCH_LOOSE) {
close(request->local_fileno);
request->local_fileno = -1;
obj_req = (struct http_object_request *)request->userData;

if (request->curl_result != CURLE_OK &&
request->http_code != 416) {
if (stat(request->tmpfile, &st) == 0) {
if (st.st_size == 0)
unlink_or_warn(request->tmpfile);
}
} else {
if (request->http_code == 416)
warning("requested range invalid; we may already have all the data.");

git_inflate_end(&request->stream);
git_SHA1_Final(request->real_sha1, &request->c);
if (request->zret != Z_STREAM_END) {
unlink_or_warn(request->tmpfile);
} else if (hashcmp(request->obj->sha1, request->real_sha1)) {
unlink_or_warn(request->tmpfile);
} else {
request->rename =
move_temp_to_file(
request->tmpfile,
request->filename);
if (request->rename == 0)
if (finish_http_object_request(obj_req) == 0)
if (obj_req->rename == 0)
request->obj->flags |= (LOCAL | REMOTE);
}
}

/* Try fetching packed if necessary */
if (request->obj->flags & LOCAL)
if (request->obj->flags & LOCAL) {
release_http_object_request(obj_req);
release_request(request);
else
} else
start_fetch_packed(request);

} else if (request->state == RUN_FETCH_PACKED) {
@ -843,7 +662,6 @@ static void add_fetch_request(struct object *obj)
request->url = NULL;
request->lock = NULL;
request->headers = NULL;
request->local_fileno = -1;
request->state = NEED_FETCH;
request->next = request_queue_head;
request_queue_head = request;
@ -882,7 +700,6 @@ static int add_send_request(struct object *obj, struct remote_lock *lock)
request->url = NULL;
request->lock = lock;
request->headers = NULL;
request->local_fileno = -1;
request->state = NEED_PUSH;
request->next = request_queue_head;
request_queue_head = request;

267
http-walker.c
View File

@ -3,8 +3,6 @@
#include "walker.h"
#include "http.h"

#define PREV_BUF_SIZE 4096

struct alt_base
{
char *base;
@ -25,20 +23,8 @@ struct object_request
struct walker *walker;
unsigned char sha1[20];
struct alt_base *repo;
char *url;
char filename[PATH_MAX];
char tmpfile[PATH_MAX];
int local;
enum object_request_state state;
CURLcode curl_result;
char errorstr[CURL_ERROR_SIZE];
long http_code;
unsigned char real_sha1[20];
git_SHA_CTX c;
z_stream stream;
int zret;
int rename;
struct active_request_slot *slot;
struct http_object_request *req;
struct object_request *next;
};

@ -59,34 +45,6 @@ struct walker_data {

static struct object_request *object_queue_head;

static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
void *data)
{
unsigned char expn[4096];
size_t size = eltsize * nmemb;
int posn = 0;
struct object_request *obj_req = (struct object_request *)data;
do {
ssize_t retval = xwrite(obj_req->local,
(char *) ptr + posn, size - posn);
if (retval < 0)
return posn;
posn += retval;
} while (posn < size);

obj_req->stream.avail_in = size;
obj_req->stream.next_in = ptr;
do {
obj_req->stream.next_out = expn;
obj_req->stream.avail_out = sizeof(expn);
obj_req->zret = git_inflate(&obj_req->stream, Z_SYNC_FLUSH);
git_SHA1_Update(&obj_req->c, expn,
sizeof(expn) - obj_req->stream.avail_out);
} while (obj_req->stream.avail_in && obj_req->zret == Z_OK);
data_received++;
return size;
}

static void fetch_alternates(struct walker *walker, const char *base);

static void process_object_response(void *callback_data);
@ -94,172 +52,35 @@ static void process_object_response(void *callback_data);
static void start_object_request(struct walker *walker,
struct object_request *obj_req)
{
char *hex = sha1_to_hex(obj_req->sha1);
char prevfile[PATH_MAX];
char *url;
char *posn;
int prevlocal;
unsigned char prev_buf[PREV_BUF_SIZE];
ssize_t prev_read = 0;
long prev_posn = 0;
char range[RANGE_HEADER_SIZE];
struct curl_slist *range_header = NULL;
struct active_request_slot *slot;
struct http_object_request *req;

snprintf(prevfile, sizeof(prevfile), "%s.prev", obj_req->filename);
unlink_or_warn(prevfile);
rename(obj_req->tmpfile, prevfile);
unlink_or_warn(obj_req->tmpfile);

if (obj_req->local != -1)
error("fd leakage in start: %d", obj_req->local);
obj_req->local = open(obj_req->tmpfile,
O_WRONLY | O_CREAT | O_EXCL, 0666);
/*
* This could have failed due to the "lazy directory creation";
* try to mkdir the last path component.
*/
if (obj_req->local < 0 && errno == ENOENT) {
char *dir = strrchr(obj_req->tmpfile, '/');
if (dir) {
*dir = 0;
mkdir(obj_req->tmpfile, 0777);
*dir = '/';
}
obj_req->local = open(obj_req->tmpfile,
O_WRONLY | O_CREAT | O_EXCL, 0666);
}

if (obj_req->local < 0) {
req = new_http_object_request(obj_req->repo->base, obj_req->sha1);
if (req == NULL) {
obj_req->state = ABORTED;
error("Couldn't create temporary file %s for %s: %s",
obj_req->tmpfile, obj_req->filename, strerror(errno));
return;
}
obj_req->req = req;

memset(&obj_req->stream, 0, sizeof(obj_req->stream));

git_inflate_init(&obj_req->stream);

git_SHA1_Init(&obj_req->c);

url = xmalloc(strlen(obj_req->repo->base) + 51);
obj_req->url = xmalloc(strlen(obj_req->repo->base) + 51);
strcpy(url, obj_req->repo->base);
posn = url + strlen(obj_req->repo->base);
strcpy(posn, "/objects/");
posn += 9;
memcpy(posn, hex, 2);
posn += 2;
*(posn++) = '/';
strcpy(posn, hex + 2);
strcpy(obj_req->url, url);

/*
* If a previous temp file is present, process what was already
* fetched.
*/
prevlocal = open(prevfile, O_RDONLY);
if (prevlocal != -1) {
do {
prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
if (prev_read>0) {
if (fwrite_sha1_file(prev_buf,
1,
prev_read,
obj_req) == prev_read)
prev_posn += prev_read;
else
prev_read = -1;
}
} while (prev_read > 0);
close(prevlocal);
}
unlink_or_warn(prevfile);

/*
* Reset inflate/SHA1 if there was an error reading the previous temp
* file; also rewind to the beginning of the local file.
*/
if (prev_read == -1) {
memset(&obj_req->stream, 0, sizeof(obj_req->stream));
git_inflate_init(&obj_req->stream);
git_SHA1_Init(&obj_req->c);
if (prev_posn>0) {
prev_posn = 0;
lseek(obj_req->local, 0, SEEK_SET);
ftruncate(obj_req->local, 0);
}
}

slot = get_active_slot();
slot = req->slot;
slot->callback_func = process_object_response;
slot->callback_data = obj_req;
obj_req->slot = slot;

curl_easy_setopt(slot->curl, CURLOPT_FILE, obj_req);
curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, obj_req->errorstr);
curl_easy_setopt(slot->curl, CURLOPT_URL, url);
curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);

/*
* If we have successfully processed data from a previous fetch
* attempt, only fetch the data we don't already have.
*/
if (prev_posn>0) {
if (walker->get_verbosely)
fprintf(stderr,
"Resuming fetch of object %s at byte %ld\n",
hex, prev_posn);
sprintf(range, "Range: bytes=%ld-", prev_posn);
range_header = curl_slist_append(range_header, range);
curl_easy_setopt(slot->curl,
CURLOPT_HTTPHEADER, range_header);
}

/* Try to get the request started, abort the request on error */
obj_req->state = ACTIVE;
if (!start_active_slot(slot)) {
obj_req->state = ABORTED;
obj_req->slot = NULL;
close(obj_req->local);
obj_req->local = -1;
free(obj_req->url);
release_http_object_request(req);
return;
}
}

static void finish_object_request(struct object_request *obj_req)
{
struct stat st;

close(obj_req->local);
obj_req->local = -1;

if (obj_req->http_code == 416) {
fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
} else if (obj_req->curl_result != CURLE_OK) {
if (stat(obj_req->tmpfile, &st) == 0)
if (st.st_size == 0)
unlink_or_warn(obj_req->tmpfile);
if (finish_http_object_request(obj_req->req))
return;
}

git_inflate_end(&obj_req->stream);
git_SHA1_Final(obj_req->real_sha1, &obj_req->c);
if (obj_req->zret != Z_STREAM_END) {
unlink_or_warn(obj_req->tmpfile);
return;
}
if (hashcmp(obj_req->sha1, obj_req->real_sha1)) {
unlink_or_warn(obj_req->tmpfile);
return;
}
obj_req->rename =
move_temp_to_file(obj_req->tmpfile, obj_req->filename);

if (obj_req->rename == 0)
if (obj_req->req->rename == 0)
walker_say(obj_req->walker, "got %s\n", sha1_to_hex(obj_req->sha1));
}

@ -271,19 +92,16 @@ static void process_object_response(void *callback_data)
struct walker_data *data = walker->data;
struct alt_base *alt = data->alt;

obj_req->curl_result = obj_req->slot->curl_result;
obj_req->http_code = obj_req->slot->http_code;
obj_req->slot = NULL;
process_http_object_request(obj_req->req);
obj_req->state = COMPLETE;

/* Use alternates if necessary */
if (missing_target(obj_req)) {
if (missing_target(obj_req->req)) {
fetch_alternates(walker, alt->base);
if (obj_req->repo->next != NULL) {
obj_req->repo =
obj_req->repo->next;
close(obj_req->local);
obj_req->local = -1;
release_http_object_request(obj_req->req);
start_object_request(walker, obj_req);
return;
}
@ -296,8 +114,8 @@ static void release_object_request(struct object_request *obj_req)
{
struct object_request *entry = object_queue_head;

if (obj_req->local != -1)
error("fd leakage in release: %d", obj_req->local);
if (obj_req->req !=NULL && obj_req->req->localfile != -1)
error("fd leakage in release: %d", obj_req->req->localfile);
if (obj_req == object_queue_head) {
object_queue_head = obj_req->next;
} else {
@ -307,7 +125,6 @@ static void release_object_request(struct object_request *obj_req)
entry->next = entry->next->next;
}

free(obj_req->url);
free(obj_req);
}

@ -335,19 +152,13 @@ static void prefetch(struct walker *walker, unsigned char *sha1)
struct object_request *newreq;
struct object_request *tail;
struct walker_data *data = walker->data;
char *filename = sha1_file_name(sha1);

newreq = xmalloc(sizeof(*newreq));
newreq->walker = walker;
hashcpy(newreq->sha1, sha1);
newreq->repo = data->alt;
newreq->url = NULL;
newreq->local = -1;
newreq->state = WAITING;
snprintf(newreq->filename, sizeof(newreq->filename), "%s", filename);
snprintf(newreq->tmpfile, sizeof(newreq->tmpfile),
"%s.temp", filename);
newreq->slot = NULL;
newreq->req = NULL;
newreq->next = NULL;

http_is_verbose = walker->get_verbosely;
@ -638,15 +449,6 @@ abort:

static void abort_object_request(struct object_request *obj_req)
{
if (obj_req->local >= 0) {
close(obj_req->local);
obj_req->local = -1;
}
unlink_or_warn(obj_req->tmpfile);
if (obj_req->slot) {
release_active_slot(obj_req->slot);
obj_req->slot = NULL;
}
release_object_request(obj_req);
}

@ -655,6 +457,7 @@ static int fetch_object(struct walker *walker, struct alt_base *repo, unsigned c
char *hex = sha1_to_hex(sha1);
int ret = 0;
struct object_request *obj_req = object_queue_head;
struct http_object_request *req;

while (obj_req != NULL && hashcmp(obj_req->sha1, sha1))
obj_req = obj_req->next;
@ -662,6 +465,8 @@ static int fetch_object(struct walker *walker, struct alt_base *repo, unsigned c
return error("Couldn't find request for %s in the queue", hex);

if (has_sha1_file(obj_req->sha1)) {
if (obj_req->req != NULL)
abort_http_object_request(obj_req->req);
abort_object_request(obj_req);
return 0;
}
@ -673,34 +478,42 @@ static int fetch_object(struct walker *walker, struct alt_base *repo, unsigned c
start_object_request(walker, obj_req);
#endif

/*
* obj_req->req might change when fetching alternates in the callback
* process_object_response; therefore, the "shortcut" variable, req,
* is used only after we're done with slots.
*/
while (obj_req->state == ACTIVE)
run_active_slot(obj_req->slot);
run_active_slot(obj_req->req->slot);

if (obj_req->local != -1) {
close(obj_req->local);
obj_req->local = -1;
req = obj_req->req;

if (req->localfile != -1) {
close(req->localfile);
req->localfile = -1;
}

if (obj_req->state == ABORTED) {
ret = error("Request for %s aborted", hex);
} else if (obj_req->curl_result != CURLE_OK &&
obj_req->http_code != 416) {
if (missing_target(obj_req))
} else if (req->curl_result != CURLE_OK &&
req->http_code != 416) {
if (missing_target(req))
ret = -1; /* Be silent, it is probably in a pack. */
else
ret = error("%s (curl_result = %d, http_code = %ld, sha1 = %s)",
obj_req->errorstr, obj_req->curl_result,
obj_req->http_code, hex);
} else if (obj_req->zret != Z_STREAM_END) {
req->errorstr, req->curl_result,
req->http_code, hex);
} else if (req->zret != Z_STREAM_END) {
walker->corrupt_object_found++;
ret = error("File %s (%s) corrupt", hex, obj_req->url);
} else if (hashcmp(obj_req->sha1, obj_req->real_sha1)) {
ret = error("File %s (%s) corrupt", hex, req->url);
} else if (hashcmp(obj_req->sha1, req->real_sha1)) {
ret = error("File %s has bad hash", hex);
} else if (obj_req->rename < 0) {
} else if (req->rename < 0) {
ret = error("unable to write sha1 filename %s",
obj_req->filename);
req->filename);
}

release_http_object_request(req);
release_object_request(obj_req);
return ret;
}

250
http.c
View File

@ -12,6 +12,10 @@ static CURLM *curlm;
#ifndef NO_CURL_EASY_DUPHANDLE
static CURL *curl_default;
#endif

#define PREV_BUF_SIZE 4096
#define RANGE_HEADER_SIZE 30

char curl_errorstr[CURL_ERROR_SIZE];

static int curl_ssl_verify = -1;
@ -30,8 +34,7 @@ static const char *curl_http_proxy;
static char *user_name, *user_pass;

static struct curl_slist *pragma_header;

struct curl_slist *no_pragma_header;
static struct curl_slist *no_pragma_header;

static struct active_request_slot *active_queue_head;

@ -666,6 +669,23 @@ static char *quote_ref_url(const char *base, const char *ref)
return strbuf_detach(&buf, NULL);
}

void append_remote_object_url(struct strbuf *buf, const char *url,
const char *hex,
int only_two_digit_prefix)
{
strbuf_addf(buf, "%s/objects/%.*s/", url, 2, hex);
if (!only_two_digit_prefix)
strbuf_addf(buf, "%s", hex+2);
}

char *get_remote_object_url(const char *url, const char *hex,
int only_two_digit_prefix)
{
struct strbuf buf = STRBUF_INIT;
append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
return strbuf_detach(&buf, NULL);
}

/* http_request() targets */
#define HTTP_REQUEST_STRBUF 0
#define HTTP_REQUEST_FILE 1
@ -995,3 +1015,229 @@ abort:
free(filename);
return NULL;
}

/* Helpers for fetching objects (loose) */
static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
void *data)
{
unsigned char expn[4096];
size_t size = eltsize * nmemb;
int posn = 0;
struct http_object_request *freq =
(struct http_object_request *)data;
do {
ssize_t retval = xwrite(freq->localfile,
(char *) ptr + posn, size - posn);
if (retval < 0)
return posn;
posn += retval;
} while (posn < size);

freq->stream.avail_in = size;
freq->stream.next_in = ptr;
do {
freq->stream.next_out = expn;
freq->stream.avail_out = sizeof(expn);
freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
git_SHA1_Update(&freq->c, expn,
sizeof(expn) - freq->stream.avail_out);
} while (freq->stream.avail_in && freq->zret == Z_OK);
data_received++;
return size;
}

struct http_object_request *new_http_object_request(const char *base_url,
unsigned char *sha1)
{
char *hex = sha1_to_hex(sha1);
char *filename;
char prevfile[PATH_MAX];
char *url;
int prevlocal;
unsigned char prev_buf[PREV_BUF_SIZE];
ssize_t prev_read = 0;
long prev_posn = 0;
char range[RANGE_HEADER_SIZE];
struct curl_slist *range_header = NULL;
struct http_object_request *freq;

freq = xmalloc(sizeof(*freq));
hashcpy(freq->sha1, sha1);
freq->localfile = -1;

filename = sha1_file_name(sha1);
snprintf(freq->filename, sizeof(freq->filename), "%s", filename);
snprintf(freq->tmpfile, sizeof(freq->tmpfile),
"%s.temp", filename);

snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
unlink_or_warn(prevfile);
rename(freq->tmpfile, prevfile);
unlink_or_warn(freq->tmpfile);

if (freq->localfile != -1)
error("fd leakage in start: %d", freq->localfile);
freq->localfile = open(freq->tmpfile,
O_WRONLY | O_CREAT | O_EXCL, 0666);
/*
* This could have failed due to the "lazy directory creation";
* try to mkdir the last path component.
*/
if (freq->localfile < 0 && errno == ENOENT) {
char *dir = strrchr(freq->tmpfile, '/');
if (dir) {
*dir = 0;
mkdir(freq->tmpfile, 0777);
*dir = '/';
}
freq->localfile = open(freq->tmpfile,
O_WRONLY | O_CREAT | O_EXCL, 0666);
}

if (freq->localfile < 0) {
error("Couldn't create temporary file %s for %s: %s",
freq->tmpfile, freq->filename, strerror(errno));
goto abort;
}

memset(&freq->stream, 0, sizeof(freq->stream));

git_inflate_init(&freq->stream);

git_SHA1_Init(&freq->c);

url = get_remote_object_url(base_url, hex, 0);
freq->url = xstrdup(url);

/*
* If a previous temp file is present, process what was already
* fetched.
*/
prevlocal = open(prevfile, O_RDONLY);
if (prevlocal != -1) {
do {
prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
if (prev_read>0) {
if (fwrite_sha1_file(prev_buf,
1,
prev_read,
freq) == prev_read) {
prev_posn += prev_read;
} else {
prev_read = -1;
}
}
} while (prev_read > 0);
close(prevlocal);
}
unlink_or_warn(prevfile);

/*
* Reset inflate/SHA1 if there was an error reading the previous temp
* file; also rewind to the beginning of the local file.
*/
if (prev_read == -1) {
memset(&freq->stream, 0, sizeof(freq->stream));
git_inflate_init(&freq->stream);
git_SHA1_Init(&freq->c);
if (prev_posn>0) {
prev_posn = 0;
lseek(freq->localfile, 0, SEEK_SET);
ftruncate(freq->localfile, 0);
}
}

freq->slot = get_active_slot();

curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
curl_easy_setopt(freq->slot->curl, CURLOPT_URL, url);
curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);

/*
* If we have successfully processed data from a previous fetch
* attempt, only fetch the data we don't already have.
*/
if (prev_posn>0) {
if (http_is_verbose)
fprintf(stderr,
"Resuming fetch of object %s at byte %ld\n",
hex, prev_posn);
sprintf(range, "Range: bytes=%ld-", prev_posn);
range_header = curl_slist_append(range_header, range);
curl_easy_setopt(freq->slot->curl,
CURLOPT_HTTPHEADER, range_header);
}

return freq;

free(url);
abort:
free(filename);
free(freq);
return NULL;
}

void process_http_object_request(struct http_object_request *freq)
{
if (freq->slot == NULL)
return;
freq->curl_result = freq->slot->curl_result;
freq->http_code = freq->slot->http_code;
freq->slot = NULL;
}

int finish_http_object_request(struct http_object_request *freq)
{
struct stat st;

close(freq->localfile);
freq->localfile = -1;

process_http_object_request(freq);

if (freq->http_code == 416) {
fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
} else if (freq->curl_result != CURLE_OK) {
if (stat(freq->tmpfile, &st) == 0)
if (st.st_size == 0)
unlink_or_warn(freq->tmpfile);
return -1;
}

git_inflate_end(&freq->stream);
git_SHA1_Final(freq->real_sha1, &freq->c);
if (freq->zret != Z_STREAM_END) {
unlink_or_warn(freq->tmpfile);
return -1;
}
if (hashcmp(freq->sha1, freq->real_sha1)) {
unlink_or_warn(freq->tmpfile);
return -1;
}
freq->rename =
move_temp_to_file(freq->tmpfile, freq->filename);

return freq->rename;
}

void abort_http_object_request(struct http_object_request *freq)
{
unlink_or_warn(freq->tmpfile);

release_http_object_request(freq);
}

void release_http_object_request(struct http_object_request *freq)
{
if (freq->localfile != -1) {
close(freq->localfile);
freq->localfile = -1;
}
if (freq->url != NULL) {
free(freq->url);
freq->url = NULL;
}
freq->slot = NULL;
}

37
http.h
View File

@ -88,10 +88,6 @@ extern void add_fill_function(void *data, int (*fill)(void *));
extern void step_active_slots(void);
#endif

extern struct curl_slist *no_pragma_header;

#define RANGE_HEADER_SIZE 30

extern void http_init(struct remote *remote);
extern void http_cleanup(void);

@ -114,6 +110,13 @@ static inline int missing__target(int code, int result)

#define missing_target(a) missing__target((a)->http_code, (a)->curl_result)

/* Helpers for modifying and creating URLs */
extern void append_remote_object_url(struct strbuf *buf, const char *url,
const char *hex,
int only_two_digit_prefix);
extern char *get_remote_object_url(const char *url, const char *hex,
int only_two_digit_prefix);

/* Options for http_request_*() */
#define HTTP_NO_CACHE 1

@ -167,4 +170,30 @@ extern struct http_pack_request *new_http_pack_request(
extern int finish_http_pack_request(struct http_pack_request *preq);
extern void release_http_pack_request(struct http_pack_request *preq);

/* Helpers for fetching object */
struct http_object_request
{
char *url;
char filename[PATH_MAX];
char tmpfile[PATH_MAX];
int localfile;
CURLcode curl_result;
char errorstr[CURL_ERROR_SIZE];
long http_code;
unsigned char sha1[20];
unsigned char real_sha1[20];
git_SHA_CTX c;
z_stream stream;
int zret;
int rename;
struct active_request_slot *slot;
};

extern struct http_object_request *new_http_object_request(
const char *base_url, unsigned char *sha1);
extern void process_http_object_request(struct http_object_request *freq);
extern int finish_http_object_request(struct http_object_request *freq);
extern void abort_http_object_request(struct http_object_request *freq);
extern void release_http_object_request(struct http_object_request *freq);

#endif /* HTTP_H */