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authorLars Hjemli <hjemli@gmail.com>2009-08-20 15:41:54 +0000
committerLars Hjemli <hjemli@gmail.com>2009-08-24 08:22:57 +0000
commitd746827ec43a6dd53bce56ee8d8100a03383329e (patch)
treef7d9e273672b7d0cf6c97bb40f7573a5d2ae178d
parent302a3efa261b1b6127b2a2189e25ab45019b1b54 (diff)
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cgit.c: add support for caching autodetected repositories
Signed-off-by: Lars Hjemli <hjemli@gmail.com>
-rw-r--r--cgit.c75
-rw-r--r--cgit.h1
2 files changed, 75 insertions, 1 deletions
diff --git a/cgit.c b/cgit.c
index db96905..594b950 100644
--- a/cgit.c
+++ b/cgit.c
@@ -40,6 +40,8 @@ struct cgit_filter *new_filter(const char *cmd, int extra_args)
return f;
}
+static void process_cached_repolist(const char *path);
+
void config_cb(const char *name, const char *value)
{
if (!strcmp(name, "root-title"))
@@ -96,6 +98,8 @@ void config_cb(const char *name, const char *value)
ctx.cfg.cache_root_ttl = atoi(value);
else if (!strcmp(name, "cache-repo-ttl"))
ctx.cfg.cache_repo_ttl = atoi(value);
+ else if (!strcmp(name, "cache-scanrc-ttl"))
+ ctx.cfg.cache_scanrc_ttl = atoi(value);
else if (!strcmp(name, "cache-static-ttl"))
ctx.cfg.cache_static_ttl = atoi(value);
else if (!strcmp(name, "cache-dynamic-ttl"))
@@ -137,7 +141,10 @@ void config_cb(const char *name, const char *value)
else if (!strcmp(name, "repo.group"))
ctx.cfg.repo_group = xstrdup(value);
else if (!strcmp(name, "repo.scan"))
- scan_tree(value);
+ if (!ctx.cfg.nocache && ctx.cfg.cache_size)
+ process_cached_repolist(value);
+ else
+ scan_tree(value);
else if (!strcmp(name, "repo.url"))
ctx.repo = cgit_add_repo(value);
else if (!strcmp(name, "repo.name"))
@@ -236,6 +243,7 @@ static void prepare_context(struct cgit_context *ctx)
ctx->cfg.cache_repo_ttl = 5;
ctx->cfg.cache_root = CGIT_CACHE_ROOT;
ctx->cfg.cache_root_ttl = 5;
+ ctx->cfg.cache_scanrc_ttl = 15;
ctx->cfg.cache_static_ttl = -1;
ctx->cfg.css = "/cgit.css";
ctx->cfg.logo = "/cgit.png";
@@ -438,6 +446,71 @@ void print_repolist(FILE *f, struct cgit_repolist *list, int start)
print_repo(f, &list->repos[i]);
}
+/* Scan 'path' for git repositories, save the resulting repolist in 'cached_rc'
+ * and return 0 on success.
+ */
+static int generate_cached_repolist(const char *path, const char *cached_rc)
+{
+ char *locked_rc;
+ int idx;
+ FILE *f;
+
+ locked_rc = xstrdup(fmt("%s.lock", cached_rc));
+ f = fopen(locked_rc, "wx");
+ if (!f) {
+ /* Inform about the error unless the lockfile already existed,
+ * since that only means we've got concurrent requests.
+ */
+ if (errno != EEXIST)
+ fprintf(stderr, "[cgit] Error opening %s: %s (%d)\n",
+ locked_rc, strerror(errno), errno);
+ return errno;
+ }
+ idx = cgit_repolist.count;
+ scan_tree(path);
+ print_repolist(f, &cgit_repolist, idx);
+ if (rename(locked_rc, cached_rc))
+ fprintf(stderr, "[cgit] Error renaming %s to %s: %s (%d)\n",
+ locked_rc, cached_rc, strerror(errno), errno);
+ fclose(f);
+ return 0;
+}
+
+static void process_cached_repolist(const char *path)
+{
+ struct stat st;
+ char *cached_rc;
+ time_t age;
+
+ cached_rc = xstrdup(fmt("%s/rc-%8x", ctx.cfg.cache_root,
+ hash_str(path)));
+
+ if (stat(cached_rc, &st)) {
+ /* Nothing is cached, we need to scan without forking. And
+ * if we fail to generate a cached repolist, we need to
+ * invoke scan_tree manually.
+ */
+ if (generate_cached_repolist(path, cached_rc))
+ scan_tree(path);
+ return;
+ }
+
+ parse_configfile(cached_rc, config_cb);
+
+ /* If the cached configfile hasn't expired, lets exit now */
+ age = time(NULL) - st.st_mtime;
+ if (age <= (ctx.cfg.cache_scanrc_ttl * 60))
+ return;
+
+ /* The cached repolist has been parsed, but it was old. So lets
+ * rescan the specified path and generate a new cached repolist
+ * in a child-process to avoid latency for the current request.
+ */
+ if (fork())
+ return;
+
+ exit(generate_cached_repolist(path, cached_rc));
+}
static void cgit_parse_args(int argc, const char **argv)
{
diff --git a/cgit.h b/cgit.h
index adb8da4..5659580 100644
--- a/cgit.h
+++ b/cgit.h
@@ -168,6 +168,7 @@ struct cgit_config {
int cache_max_create_time;
int cache_repo_ttl;
int cache_root_ttl;
+ int cache_scanrc_ttl;
int cache_static_ttl;
int embedded;
int enable_index_links;