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Diffstat (limited to 'http.c')
-rw-r--r--http.c250
1 files changed, 248 insertions, 2 deletions
diff --git a/http.c b/http.c
index 381593441..95b2137cf 100644
--- a/http.c
+++ b/http.c
@@ -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;
+}
generated by cgit v1.2.1 (git 2.18.0) at 2024-11-15 11:57:16 +0000