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authorTay Ray Chuan <rctay89@gmail.com>2009-06-06 08:44:02 (GMT)
committerJunio C Hamano <gitster@pobox.com>2009-06-06 18:03:11 (GMT)
commit5424bc557fc6414660830b470dd45774b8f5f281 (patch)
tree418193e2e6ca3dce2ba599451a4981a4c368b2a5 /http-walker.c
parent2264dfa5c4f11e2b0e2740072208186bee361afd (diff)
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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>
Diffstat (limited to 'http-walker.c')
-rw-r--r--http-walker.c267
1 files changed, 40 insertions, 227 deletions
diff --git a/http-walker.c b/http-walker.c
index 8f7a975..700bc13 100644
--- a/http-walker.c
+++ b/http-walker.c
@@ -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);
+
+ req = obj_req->req;
- if (obj_req->local != -1) {
- close(obj_req->local);
- obj_req->local = -1;
+ 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;
}