From e388ab74dbaea5cdbf07b175be8d6980579392f4 Mon Sep 17 00:00:00 2001
From: Nick Hengeveld <nickh@reactrix.com>
Date: Fri, 18 Nov 2005 11:03:04 -0800
Subject: [PATCH] Make http-fetch request types more clear
Rename object request functions and data to make it more clear which type
of request is being processed - this is a response to the introduction of
slot callbacks and the definition of different types of requests such as
alternates_request.
Signed-off-by: Nick Hengeveld <nickh@reactrix.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>
---
http-fetch.c | 275 ++++++++++++++++++++++++++-------------------------
1 file changed, 139 insertions(+), 136 deletions(-)
diff --git a/http-fetch.c b/http-fetch.c
index 6a9eaf3a5a9..53a7dbf40c0 100644
--- a/http-fetch.c
+++ b/http-fetch.c
@@ -21,14 +21,14 @@ struct alt_base
static struct alt_base *alt = NULL;
-enum transfer_state {
+enum object_request_state {
WAITING,
ABORTED,
ACTIVE,
COMPLETE,
};
-struct transfer_request
+struct object_request
{
unsigned char sha1[20];
struct alt_base *repo;
@@ -36,7 +36,7 @@ struct transfer_request
char filename[PATH_MAX];
char tmpfile[PATH_MAX];
int local;
- enum transfer_state state;
+ enum object_request_state state;
CURLcode curl_result;
char errorstr[CURL_ERROR_SIZE];
long http_code;
@@ -46,10 +46,10 @@ struct transfer_request
int zret;
int rename;
struct active_request_slot *slot;
- struct transfer_request *next;
+ struct object_request *next;
};
-struct alt_request {
+struct alternates_request {
char *base;
char *url;
struct buffer *buffer;
@@ -57,7 +57,7 @@ struct alt_request {
int http_specific;
};
-static struct transfer_request *request_queue_head = NULL;
+static struct object_request *object_queue_head = NULL;
static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
void *data)
@@ -65,24 +65,24 @@ static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
unsigned char expn[4096];
size_t size = eltsize * nmemb;
int posn = 0;
- struct transfer_request *request = (struct transfer_request *)data;
+ struct object_request *obj_req = (struct object_request *)data;
do {
- ssize_t retval = write(request->local,
+ ssize_t retval = write(obj_req->local,
ptr + posn, size - posn);
if (retval < 0)
return posn;
posn += retval;
} while (posn < size);
- request->stream.avail_in = size;
- request->stream.next_in = ptr;
+ obj_req->stream.avail_in = size;
+ obj_req->stream.next_in = ptr;
do {
- request->stream.next_out = expn;
- request->stream.avail_out = sizeof(expn);
- request->zret = inflate(&request->stream, Z_SYNC_FLUSH);
- SHA1_Update(&request->c, expn,
- sizeof(expn) - request->stream.avail_out);
- } while (request->stream.avail_in && request->zret == Z_OK);
+ obj_req->stream.next_out = expn;
+ obj_req->stream.avail_out = sizeof(expn);
+ obj_req->zret = inflate(&obj_req->stream, Z_SYNC_FLUSH);
+ 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;
}
@@ -91,9 +91,9 @@ static void fetch_alternates(char *base);
static void process_object_response(void *callback_data);
-static void start_request(struct transfer_request *request)
+static void start_object_request(struct object_request *obj_req)
{
- char *hex = sha1_to_hex(request->sha1);
+ char *hex = sha1_to_hex(obj_req->sha1);
char prevfile[PATH_MAX];
char *url;
char *posn;
@@ -105,53 +105,53 @@ static void start_request(struct transfer_request *request)
struct curl_slist *range_header = NULL;
struct active_request_slot *slot;
- snprintf(prevfile, sizeof(prevfile), "%s.prev", request->filename);
+ snprintf(prevfile, sizeof(prevfile), "%s.prev", obj_req->filename);
unlink(prevfile);
- rename(request->tmpfile, prevfile);
- unlink(request->tmpfile);
+ rename(obj_req->tmpfile, prevfile);
+ unlink(obj_req->tmpfile);
- if (request->local != -1)
- error("fd leakage in start: %d", request->local);
- request->local = open(request->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 (request->local < 0 && errno == ENOENT) {
- char *dir = strrchr(request->tmpfile, '/');
+ if (obj_req->local < 0 && errno == ENOENT) {
+ char *dir = strrchr(obj_req->tmpfile, '/');
if (dir) {
*dir = 0;
- mkdir(request->tmpfile, 0777);
+ mkdir(obj_req->tmpfile, 0777);
*dir = '/';
}
- request->local = open(request->tmpfile,
+ obj_req->local = open(obj_req->tmpfile,
O_WRONLY | O_CREAT | O_EXCL, 0666);
}
- if (request->local < 0) {
- request->state = ABORTED;
+ if (obj_req->local < 0) {
+ obj_req->state = ABORTED;
error("Couldn't create temporary file %s for %s: %s\n",
- request->tmpfile, request->filename, strerror(errno));
+ obj_req->tmpfile, obj_req->filename, strerror(errno));
return;
}
- memset(&request->stream, 0, sizeof(request->stream));
+ memset(&obj_req->stream, 0, sizeof(obj_req->stream));
- inflateInit(&request->stream);
+ inflateInit(&obj_req->stream);
- SHA1_Init(&request->c);
+ SHA1_Init(&obj_req->c);
- url = xmalloc(strlen(request->repo->base) + 50);
- request->url = xmalloc(strlen(request->repo->base) + 50);
- strcpy(url, request->repo->base);
- posn = url + strlen(request->repo->base);
+ url = xmalloc(strlen(obj_req->repo->base) + 50);
+ obj_req->url = xmalloc(strlen(obj_req->repo->base) + 50);
+ strcpy(url, obj_req->repo->base);
+ posn = url + strlen(obj_req->repo->base);
strcpy(posn, "objects/");
posn += 8;
memcpy(posn, hex, 2);
posn += 2;
*(posn++) = '/';
strcpy(posn, hex + 2);
- strcpy(request->url, url);
+ strcpy(obj_req->url, url);
/* If a previous temp file is present, process what was already
fetched. */
@@ -163,7 +163,7 @@ static void start_request(struct transfer_request *request)
if (fwrite_sha1_file(prev_buf,
1,
prev_read,
- request) == prev_read) {
+ obj_req) == prev_read) {
prev_posn += prev_read;
} else {
prev_read = -1;
@@ -177,24 +177,24 @@ static void start_request(struct transfer_request *request)
/* 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));
- inflateInit(&request->stream);
- SHA1_Init(&request->c);
+ memset(&obj_req->stream, 0, sizeof(obj_req->stream));
+ inflateInit(&obj_req->stream);
+ SHA1_Init(&obj_req->c);
if (prev_posn>0) {
prev_posn = 0;
- lseek(request->local, SEEK_SET, 0);
- ftruncate(request->local, 0);
+ lseek(obj_req->local, SEEK_SET, 0);
+ ftruncate(obj_req->local, 0);
}
}
slot = get_active_slot();
slot->callback_func = process_object_response;
- slot->callback_data = request;
- request->slot = slot;
+ slot->callback_data = obj_req;
+ obj_req->slot = slot;
- curl_easy_setopt(slot->curl, CURLOPT_FILE, request);
+ 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, request->errorstr);
+ 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);
@@ -212,109 +212,111 @@ static void start_request(struct transfer_request *request)
}
/* Try to get the request started, abort the request on error */
- request->state = ACTIVE;
+ obj_req->state = ACTIVE;
if (!start_active_slot(slot)) {
- request->state = ABORTED;
- request->slot = NULL;
- close(request->local); request->local = -1;
- free(request->url);
+ obj_req->state = ABORTED;
+ obj_req->slot = NULL;
+ close(obj_req->local); obj_req->local = -1;
+ free(obj_req->url);
+ return;
}
+
}
-static void finish_request(struct transfer_request *request)
+static void finish_object_request(struct object_request *obj_req)
{
struct stat st;
- fchmod(request->local, 0444);
- close(request->local); request->local = -1;
+ fchmod(obj_req->local, 0444);
+ close(obj_req->local); obj_req->local = -1;
- if (request->http_code == 416) {
+ if (obj_req->http_code == 416) {
fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
- } else if (request->curl_result != CURLE_OK) {
- if (stat(request->tmpfile, &st) == 0)
+ } else if (obj_req->curl_result != CURLE_OK) {
+ if (stat(obj_req->tmpfile, &st) == 0)
if (st.st_size == 0)
- unlink(request->tmpfile);
+ unlink(obj_req->tmpfile);
return;
}
- inflateEnd(&request->stream);
- SHA1_Final(request->real_sha1, &request->c);
- if (request->zret != Z_STREAM_END) {
- unlink(request->tmpfile);
+ inflateEnd(&obj_req->stream);
+ SHA1_Final(obj_req->real_sha1, &obj_req->c);
+ if (obj_req->zret != Z_STREAM_END) {
+ unlink(obj_req->tmpfile);
return;
}
- if (memcmp(request->sha1, request->real_sha1, 20)) {
- unlink(request->tmpfile);
+ if (memcmp(obj_req->sha1, obj_req->real_sha1, 20)) {
+ unlink(obj_req->tmpfile);
return;
}
- request->rename =
- move_temp_to_file(request->tmpfile, request->filename);
+ obj_req->rename =
+ move_temp_to_file(obj_req->tmpfile, obj_req->filename);
- if (request->rename == 0)
- pull_say("got %s\n", sha1_to_hex(request->sha1));
+ if (obj_req->rename == 0)
+ pull_say("got %s\n", sha1_to_hex(obj_req->sha1));
}
static void process_object_response(void *callback_data)
{
- struct transfer_request *request =
- (struct transfer_request *)callback_data;
+ struct object_request *obj_req =
+ (struct object_request *)callback_data;
- request->curl_result = request->slot->curl_result;
- request->http_code = request->slot->http_code;
- request->slot = NULL;
- request->state = COMPLETE;
+ obj_req->curl_result = obj_req->slot->curl_result;
+ obj_req->http_code = obj_req->slot->http_code;
+ obj_req->slot = NULL;
+ obj_req->state = COMPLETE;
/* Use alternates if necessary */
- if (request->http_code == 404) {
+ if (obj_req->http_code == 404) {
fetch_alternates(alt->base);
- if (request->repo->next != NULL) {
- request->repo =
- request->repo->next;
- close(request->local);
- request->local = -1;
- start_request(request);
+ if (obj_req->repo->next != NULL) {
+ obj_req->repo =
+ obj_req->repo->next;
+ close(obj_req->local);
+ obj_req->local = -1;
+ start_object_request(obj_req);
return;
}
}
- finish_request(request);
+ finish_object_request(obj_req);
}
-static void release_request(struct transfer_request *request)
+static void release_object_request(struct object_request *obj_req)
{
- struct transfer_request *entry = request_queue_head;
+ struct object_request *entry = object_queue_head;
- if (request->local != -1)
- error("fd leakage in release: %d", request->local);
- if (request == request_queue_head) {
- request_queue_head = request->next;
+ if (obj_req->local != -1)
+ error("fd leakage in release: %d", obj_req->local);
+ if (obj_req == object_queue_head) {
+ object_queue_head = obj_req->next;
} else {
- while (entry->next != NULL && entry->next != request)
+ while (entry->next != NULL && entry->next != obj_req)
entry = entry->next;
- if (entry->next == request)
+ if (entry->next == obj_req)
entry->next = entry->next->next;
}
- free(request->url);
- free(request);
+ free(obj_req->url);
+ free(obj_req);
}
#ifdef USE_CURL_MULTI
void fill_active_slots(void)
{
- struct transfer_request *request = request_queue_head;
+ struct object_request *obj_req = object_queue_head;
struct active_request_slot *slot = active_queue_head;
int num_transfers;
- while (active_requests < max_requests && request != NULL) {
- if (request->state == WAITING) {
- if (has_sha1_file(request->sha1))
- release_request(request);
+ while (active_requests < max_requests && obj_req != NULL) {
+ if (obj_req->state == WAITING) {
+ if (has_sha1_file(obj_req->sha1))
+ release_object_request(obj_req);
else
- start_request(request);
+ start_object_request(obj_req);
curl_multi_perform(curlm, &num_transfers);
}
- request = request->next;
+ obj_req = obj_req->next;
}
while (slot != NULL) {
@@ -329,8 +331,8 @@ void fill_active_slots(void)
void prefetch(unsigned char *sha1)
{
- struct transfer_request *newreq;
- struct transfer_request *tail;
+ struct object_request *newreq;
+ struct object_request *tail;
char *filename = sha1_file_name(sha1);
newreq = xmalloc(sizeof(*newreq));
@@ -344,10 +346,10 @@ void prefetch(unsigned char *sha1)
"%s.temp", filename);
newreq->next = NULL;
- if (request_queue_head == NULL) {
- request_queue_head = newreq;
+ if (object_queue_head == NULL) {
+ object_queue_head = newreq;
} else {
- tail = request_queue_head;
+ tail = object_queue_head;
while (tail->next != NULL) {
tail = tail->next;
}
@@ -441,9 +443,10 @@ static int setup_index(struct alt_base *repo, unsigned char *sha1)
return 0;
}
-static void process_alternates(void *callback_data)
+static void process_alternates_response(void *callback_data)
{
- struct alt_request *alt_req = (struct alt_request *)callback_data;
+ struct alternates_request *alt_req =
+ (struct alternates_request *)callback_data;
struct active_request_slot *slot = alt_req->slot;
struct alt_base *tail = alt;
char *base = alt_req->base;
@@ -548,7 +551,7 @@ static void fetch_alternates(char *base)
char *url;
char *data;
struct active_request_slot *slot;
- static struct alt_request alt_req;
+ static struct alternates_request alt_req;
/* If another request has already started fetching alternates,
wait for them to arrive and return to processing this request's
@@ -580,7 +583,7 @@ static void fetch_alternates(char *base)
/* Use a callback to process the result, since another request
may fail and need to have alternates loaded before continuing */
slot = get_active_slot();
- slot->callback_func = process_alternates;
+ slot->callback_func = process_alternates_response;
slot->callback_data = &alt_req;
curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
@@ -760,54 +763,54 @@ static int fetch_object(struct alt_base *repo, unsigned char *sha1)
{
char *hex = sha1_to_hex(sha1);
int ret = 0;
- struct transfer_request *request = request_queue_head;
+ struct object_request *obj_req = object_queue_head;
- while (request != NULL && memcmp(request->sha1, sha1, 20))
- request = request->next;
- if (request == NULL)
+ while (obj_req != NULL && memcmp(obj_req->sha1, sha1, 20))
+ obj_req = obj_req->next;
+ if (obj_req == NULL)
return error("Couldn't find request for %s in the queue", hex);
- if (has_sha1_file(request->sha1)) {
- release_request(request);
+ if (has_sha1_file(obj_req->sha1)) {
+ release_object_request(obj_req);
return 0;
}
#ifdef USE_CURL_MULTI
- while (request->state == WAITING) {
+ while (obj_req->state == WAITING) {
step_active_slots();
}
#else
- start_request(request);
+ start_object_request(obj_req);
#endif
- while (request->state == ACTIVE) {
- run_active_slot(request->slot);
+ while (obj_req->state == ACTIVE) {
+ run_active_slot(obj_req->slot);
}
- if (request->local != -1) {
- close(request->local); request->local = -1;
+ if (obj_req->local != -1) {
+ close(obj_req->local); obj_req->local = -1;
}
- if (request->state == ABORTED) {
+ if (obj_req->state == ABORTED) {
ret = error("Request for %s aborted", hex);
- } else if (request->curl_result != CURLE_OK &&
- request->http_code != 416) {
- if (request->http_code == 404)
+ } else if (obj_req->curl_result != CURLE_OK &&
+ obj_req->http_code != 416) {
+ if (obj_req->http_code == 404)
ret = -1; /* Be silent, it is probably in a pack. */
else
ret = error("%s (curl_result = %d, http_code = %ld, sha1 = %s)",
- request->errorstr, request->curl_result,
- request->http_code, hex);
- } else if (request->zret != Z_STREAM_END) {
- ret = error("File %s (%s) corrupt\n", hex, request->url);
- } else if (memcmp(request->sha1, request->real_sha1, 20)) {
+ obj_req->errorstr, obj_req->curl_result,
+ obj_req->http_code, hex);
+ } else if (obj_req->zret != Z_STREAM_END) {
+ ret = error("File %s (%s) corrupt\n", hex, obj_req->url);
+ } else if (memcmp(obj_req->sha1, obj_req->real_sha1, 20)) {
ret = error("File %s has bad hash\n", hex);
- } else if (request->rename < 0) {
+ } else if (obj_req->rename < 0) {
ret = error("unable to write sha1 filename %s: %s",
- request->filename,
- strerror(request->rename));
+ obj_req->filename,
+ strerror(obj_req->rename));
}
- release_request(request);
+ release_object_request(obj_req);
return ret;
}