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/* ui-log.c: functions for log output
 *
 * Copyright (C) 2006 Lars Hjemli
 *
 * Licensed under GNU General Public License v2
 *   (see COPYING for full license text)
 */

#include "cgit.h"

void print_commit(struct commit *commit)
{
	char buf[32];
	struct commitinfo *info;
	struct tm *time;

	info = cgit_parse_commit(commit);
	time = gmtime(&commit->date);
	html("<tr><td>");
	strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", time);
	html_txt(buf);
	html("</td><td>");
	char *qry = fmt("id=%s", sha1_to_hex(commit->object.sha1));
	char *url = cgit_pageurl(cgit_query_repo, "commit", qry);
	html_link_open(url, NULL, NULL);
	html_ntxt(80, info->subject);
	html_link_close();
	html("</td><td>");
	html_txt(info->author);
	html("</td></tr>\n");
	cgit_free_commitinfo(info);
}


void cgit_print_log(const char *tip, int ofs, int cnt, char *grep)
{
	struct rev_info rev;
	struct commit *commit;
	const char *argv[3] = {NULL, tip, NULL};
	int argc = 2;
	int i;
	
	if (grep)
		argv[argc++] = fmt("--grep=%s", grep);
	init_revisions(&rev, NULL);
	rev.abbrev = DEFAULT_ABBREV;
	rev.commit_format = CMIT_FMT_DEFAULT;
	rev.verbose_header = 1;
	rev.show_root_diff = 0;
	setup_revisions(argc, argv, &rev, NULL);
	if (rev.grep_filter) {
		rev.grep_filter->regflags |= REG_ICASE;
		compile_grep_patterns(rev.grep_filter);
	}
	prepare_revision_walk(&rev);

	html("<h2>Log</h2>");
	html("<table class='list nowrap'>");
	html("<tr><th class='left'>Date</th>"
	     "<th class='left'>Message</th>"
	     "<th class='left'>Author</th></tr>\n");

	if (ofs<0)
		ofs = 0;

	for (i = 0; i < ofs && (commit = get_revision(&rev)) != NULL; i++) {
		free(commit->buffer);
		commit->buffer = NULL;
		free_commit_list(commit->parents);
		commit->parents = NULL;
	}

	for (i = 0; i < cnt && (commit = get_revision(&rev)) != NULL; i++) {
		print_commit(commit);
		free(commit->buffer);
		commit->buffer = NULL;
		free_commit_list(commit->parents);
		commit->parents = NULL;
	}
	html("</table>\n");

	html("<div class='pager'>");
	if (ofs > 0) {
		html("&nbsp;<a href='");
		html(cgit_pageurl(cgit_query_repo, cgit_query_page,
				  fmt("h=%s&ofs=%d", tip, ofs-cnt)));
		html("'>[prev]</a>&nbsp;");
       	}

	if ((commit = get_revision(&rev)) != NULL) {
		html("&nbsp;<a href='");
		html(cgit_pageurl(cgit_query_repo, "log",
				  fmt("h=%s&ofs=%d", tip, ofs+cnt)));
		html("'>[next]</a>&nbsp;");
	}
	html("</div>");
}
n class="w"> (slot->bufsize < 0) return errno; bufz = memchr(slot->buf, 0, slot->bufsize); if (bufz) bufkeylen = bufz - slot->buf; if (slot->key) slot->match = bufkeylen == slot->keylen && !memcmp(slot->key, slot->buf, bufkeylen + 1); return 0; } /* Close the active cache slot */ static int close_slot(struct cache_slot *slot) { int err = 0; if (slot->cache_fd > 0) { if (close(slot->cache_fd)) err = errno; else slot->cache_fd = -1; } return err; } /* Print the content of the active cache slot (but skip the key). */ static int print_slot(struct cache_slot *slot) { #ifdef HAVE_LINUX_SENDFILE off_t start_off; int ret; start_off = slot->keylen + 1; do { ret = sendfile(STDOUT_FILENO, slot->cache_fd, &start_off, slot->cache_st.st_size - start_off); if (ret < 0) { if (errno == EAGAIN || errno == EINTR) continue; return errno; } return 0; } while (1); #else ssize_t i, j; i = lseek(slot->cache_fd, slot->keylen + 1, SEEK_SET); if (i != slot->keylen + 1) return errno; do { i = j = xread(slot->cache_fd, slot->buf, sizeof(slot->buf)); if (i > 0) j = xwrite(STDOUT_FILENO, slot->buf, i); } while (i > 0 && j == i); if (i < 0 || j != i) return errno; else return 0; #endif } /* Check if the slot has expired */ static int is_expired(struct cache_slot *slot) { if (slot->ttl < 0) return 0; else return slot->cache_st.st_mtime + slot->ttl * 60 < time(NULL); } /* Check if the slot has been modified since we opened it. * NB: If stat() fails, we pretend the file is modified. */ static int is_modified(struct cache_slot *slot) { struct stat st; if (stat(slot->cache_name, &st)) return 1; return (st.st_ino != slot->cache_st.st_ino || st.st_mtime != slot->cache_st.st_mtime || st.st_size != slot->cache_st.st_size); } /* Close an open lockfile */ static int close_lock(struct cache_slot *slot) { int err = 0; if (slot->lock_fd > 0) { if (close(slot->lock_fd)) err = errno; else slot->lock_fd = -1; } return err; } /* Create a lockfile used to store the generated content for a cache * slot, and write the slot key + \0 into it. * Returns 0 on success and errno otherwise. */ static int lock_slot(struct cache_slot *slot) { struct flock lock = { .l_type = F_WRLCK, .l_whence = SEEK_SET, .l_start = 0, .l_len = 0, }; slot->lock_fd = open(slot->lock_name, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR); if (slot->lock_fd == -1) return errno; if (fcntl(slot->lock_fd, F_SETLK, &lock) < 0) { int saved_errno = errno; close(slot->lock_fd); slot->lock_fd = -1; return saved_errno; } if (xwrite(slot->lock_fd, slot->key, slot->keylen + 1) < 0) return errno; return 0; } /* Release the current lockfile. If `replace_old_slot` is set the * lockfile replaces the old cache slot, otherwise the lockfile is * just deleted. */ static int unlock_slot(struct cache_slot *slot, int replace_old_slot) { int err; if (replace_old_slot) err = rename(slot->lock_name, slot->cache_name); else err = unlink(slot->lock_name); if (err) return errno; return 0; } /* Generate the content for the current cache slot by redirecting * stdout to the lock-fd and invoking the callback function */ static int fill_slot(struct cache_slot *slot) { int tmp; /* Preserve stdout */ tmp = dup(STDOUT_FILENO); if (tmp == -1) return errno; /* Redirect stdout to lockfile */ if (dup2(slot->lock_fd, STDOUT_FILENO) == -1) { close(tmp); return errno; } /* Generate cache content */ slot->fn(); /* update stat info */ if (fstat(slot->lock_fd, &slot->cache_st)) { close(tmp); return errno; } /* Restore stdout */ if (dup2(tmp, STDOUT_FILENO) == -1) { close(tmp); return errno; } /* Close the temporary filedescriptor */ if (close(tmp)) return errno; return 0; } /* Crude implementation of 32-bit FNV-1 hash algorithm, * see http://www.isthe.com/chongo/tech/comp/fnv/ for details * about the magic numbers. */ #define FNV_OFFSET 0x811c9dc5 #define FNV_PRIME 0x01000193 unsigned long hash_str(const char *str) { unsigned long h = FNV_OFFSET; unsigned char *s = (unsigned char *)str; if (!s) return h; while (*s) { h *= FNV_PRIME; h ^= *s++; } return h; } static int process_slot(struct cache_slot *slot) { int err; err = open_slot(slot); if (!err && slot->match) { if (is_expired(slot)) { if (!lock_slot(slot)) { /* If the cachefile has been replaced between * `open_slot` and `lock_slot`, we'll just * serve the stale content from the original * cachefile. This way we avoid pruning the * newly generated slot. The same code-path * is chosen if fill_slot() fails for some * reason. * * TODO? check if the new slot contains the * same key as the old one, since we would * prefer to serve the newest content. * This will require us to open yet another * file-descriptor and read and compare the * key from the new file, so for now we're * lazy and just ignore the new file. */ if (is_modified(slot) || fill_slot(slot)) { unlock_slot(slot, 0); close_lock(slot); } else { close_slot(slot); unlock_slot(slot, 1); slot->cache_fd = slot->lock_fd; } } } if ((err = print_slot(slot)) != 0) { cache_log("[cgit] error printing cache %s: %s (%d)\n", slot->cache_name, strerror(err), err); } close_slot(slot); return err; } /* If the cache slot does not exist (or its key doesn't match the * current key), lets try to create a new cache slot for this * request. If this fails (for whatever reason), lets just generate * the content without caching it and fool the caller to belive * everything worked out (but print a warning on stdout). */ close_slot(slot); if ((err = lock_slot(slot)) != 0) { cache_log("[cgit] Unable to lock slot %s: %s (%d)\n", slot->lock_name, strerror(err), err); slot->fn(); return 0; } if ((err = fill_slot(slot)) != 0) { cache_log("[cgit] Unable to fill slot %s: %s (%d)\n", slot->lock_name, strerror(err), err); unlock_slot(slot, 0); close_lock(slot); slot->fn(); return 0; } // We've got a valid cache slot in the lock file, which // is about to replace the old cache slot. But if we // release the lockfile and then try to open the new cache // slot, we might get a race condition with a concurrent // writer for the same cache slot (with a different key). // Lets avoid such a race by just printing the content of // the lock file. slot->cache_fd = slot->lock_fd; unlock_slot(slot, 1); if ((err = print_slot(slot)) != 0) { cache_log("[cgit] error printing cache %s: %s (%d)\n", slot->cache_name, strerror(err), err); } close_slot(slot); return err; } /* Print cached content to stdout, generate the content if necessary. */ int cache_process(int size, const char *path, const char *key, int ttl, cache_fill_fn fn) { unsigned long hash; int i; struct strbuf filename = STRBUF_INIT; struct strbuf lockname = STRBUF_INIT; struct cache_slot slot; int result; /* If the cache is disabled, just generate the content */ if (size <= 0 || ttl == 0) { fn(); return 0; } /* Verify input, calculate filenames */ if (!path) { cache_log("[cgit] Cache path not specified, caching is disabled\n"); fn(); return 0; } if (!key) key = ""; hash = hash_str(key) % size; strbuf_addstr(&filename, path); strbuf_ensure_end(&filename, '/'); for (i = 0; i < 8; i++) { strbuf_addf(&filename, "%x", (unsigned char)(hash & 0xf)); hash >>= 4; } strbuf_addbuf(&lockname, &filename); strbuf_addstr(&lockname, ".lock"); slot.fn = fn; slot.ttl = ttl; slot.cache_name = filename.buf; slot.lock_name = lockname.buf; slot.key = key; slot.keylen = strlen(key); result = process_slot(&slot); strbuf_release(&filename); strbuf_release(&lockname); return result; } /* Return a strftime formatted date/time * NB: the result from this function is to shared memory */ static char *sprintftime(const char *format, time_t time) { static char buf[64]; struct tm *tm; if (!time) return NULL; tm = gmtime(&time); strftime(buf, sizeof(buf)-1, format, tm); return buf; } int cache_ls(const char *path) { DIR *dir; struct dirent *ent; int err = 0; struct cache_slot slot = { NULL }; struct strbuf fullname = STRBUF_INIT; size_t prefixlen; if (!path) { cache_log("[cgit] cache path not specified\n"); return -1; } dir = opendir(path); if (!dir) { err = errno; cache_log("[cgit] unable to open path %s: %s (%d)\n", path, strerror(err), err); return err; } strbuf_addstr(&fullname, path); strbuf_ensure_end(&fullname, '/'); prefixlen = fullname.len; while ((ent = readdir(dir)) != NULL) { if (strlen(ent->d_name) != 8) continue; strbuf_setlen(&fullname, prefixlen); strbuf_addstr(&fullname, ent->d_name); slot.cache_name = fullname.buf; if ((err = open_slot(&slot)) != 0) { cache_log("[cgit] unable to open path %s: %s (%d)\n", fullname.buf, strerror(err), err); continue; } htmlf("%s %s %10"PRIuMAX" %s\n", fullname.buf, sprintftime("%Y-%m-%d %H:%M:%S", slot.cache_st.st_mtime), (uintmax_t)slot.cache_st.st_size, slot.buf); close_slot(&slot); } closedir(dir); strbuf_release(&fullname); return 0; } /* Print a message to stdout */ void cache_log(const char *format, ...) { va_list args; va_start(args, format); vfprintf(stderr, format, args); va_end(args); }