939d32fda7
The original caching layer in cgit has no upper bound on the number of concurrent cache entries, so when cgit is traversed by a spider (like the googlebot), the cache might end up filling your disk. Also, if any error occurs in the cache layer, no content is returned to the client. This patch redesigns the caching layer to avoid these flaws by * giving the cache a bound number of slots * disabling the cache for the current request when errors occur The cache size limit is implemented by hashing the querystring (the cache lookup key) and generating a cache filename based on this hash modulo the cache size. In order to detect hash collisions, the full lookup key (i.e. the querystring) is stored in the cache file (separated from its associated content by ascii 0). The cache filename is the reversed 8-digit hexadecimal representation of hash(key) % cache_size which should make the filesystem lookup pretty fast (if directory content is indexed/sorted); reversing the representation avoids the problem where all keys have equal prefix. There is a new config option, cache-size, which sets the upper bound for the cache. Default value for this option is 0, which has the same effect as setting nocache=1 (hence nocache is now deprecated). Included in this patch is also a new testfile which verifies that the new option works as intended. Signed-off-by: Lars Hjemli <hjemli@gmail.com>
370 řádky
10 KiB
C
370 řádky
10 KiB
C
/* cgit.c: cgi for the git scm
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*
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* Copyright (C) 2006 Lars Hjemli
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*
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* Licensed under GNU General Public License v2
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* (see COPYING for full license text)
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*/
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#include "cgit.h"
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#include "cache.h"
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#include "cmd.h"
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#include "configfile.h"
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#include "html.h"
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#include "ui-shared.h"
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const char *cgit_version = CGIT_VERSION;
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void config_cb(const char *name, const char *value)
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{
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if (!strcmp(name, "root-title"))
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ctx.cfg.root_title = xstrdup(value);
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else if (!strcmp(name, "css"))
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ctx.cfg.css = xstrdup(value);
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else if (!strcmp(name, "logo"))
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ctx.cfg.logo = xstrdup(value);
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else if (!strcmp(name, "index-header"))
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ctx.cfg.index_header = xstrdup(value);
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else if (!strcmp(name, "index-info"))
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ctx.cfg.index_info = xstrdup(value);
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else if (!strcmp(name, "logo-link"))
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ctx.cfg.logo_link = xstrdup(value);
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else if (!strcmp(name, "module-link"))
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ctx.cfg.module_link = xstrdup(value);
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else if (!strcmp(name, "virtual-root")) {
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ctx.cfg.virtual_root = trim_end(value, '/');
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if (!ctx.cfg.virtual_root && (!strcmp(value, "/")))
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ctx.cfg.virtual_root = "";
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} else if (!strcmp(name, "nocache"))
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ctx.cfg.nocache = atoi(value);
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else if (!strcmp(name, "snapshots"))
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ctx.cfg.snapshots = cgit_parse_snapshots_mask(value);
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else if (!strcmp(name, "enable-index-links"))
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ctx.cfg.enable_index_links = atoi(value);
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else if (!strcmp(name, "enable-log-filecount"))
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ctx.cfg.enable_log_filecount = atoi(value);
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else if (!strcmp(name, "enable-log-linecount"))
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ctx.cfg.enable_log_linecount = atoi(value);
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else if (!strcmp(name, "cache-size"))
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ctx.cfg.cache_size = atoi(value);
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else if (!strcmp(name, "cache-root"))
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ctx.cfg.cache_root = xstrdup(value);
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else if (!strcmp(name, "cache-root-ttl"))
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ctx.cfg.cache_root_ttl = atoi(value);
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else if (!strcmp(name, "cache-repo-ttl"))
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ctx.cfg.cache_repo_ttl = atoi(value);
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else if (!strcmp(name, "cache-static-ttl"))
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ctx.cfg.cache_static_ttl = atoi(value);
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else if (!strcmp(name, "cache-dynamic-ttl"))
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ctx.cfg.cache_dynamic_ttl = atoi(value);
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else if (!strcmp(name, "max-message-length"))
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ctx.cfg.max_msg_len = atoi(value);
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else if (!strcmp(name, "max-repodesc-length"))
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ctx.cfg.max_repodesc_len = atoi(value);
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else if (!strcmp(name, "max-commit-count"))
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ctx.cfg.max_commit_count = atoi(value);
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else if (!strcmp(name, "summary-log"))
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ctx.cfg.summary_log = atoi(value);
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else if (!strcmp(name, "summary-branches"))
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ctx.cfg.summary_branches = atoi(value);
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else if (!strcmp(name, "summary-tags"))
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ctx.cfg.summary_tags = atoi(value);
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else if (!strcmp(name, "agefile"))
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ctx.cfg.agefile = xstrdup(value);
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else if (!strcmp(name, "renamelimit"))
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ctx.cfg.renamelimit = atoi(value);
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else if (!strcmp(name, "robots"))
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ctx.cfg.robots = xstrdup(value);
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else if (!strcmp(name, "clone-prefix"))
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ctx.cfg.clone_prefix = xstrdup(value);
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else if (!strcmp(name, "repo.group"))
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ctx.cfg.repo_group = xstrdup(value);
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else if (!strcmp(name, "repo.url"))
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ctx.repo = cgit_add_repo(value);
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else if (!strcmp(name, "repo.name"))
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ctx.repo->name = xstrdup(value);
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else if (ctx.repo && !strcmp(name, "repo.path"))
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ctx.repo->path = trim_end(value, '/');
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else if (ctx.repo && !strcmp(name, "repo.clone-url"))
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ctx.repo->clone_url = xstrdup(value);
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else if (ctx.repo && !strcmp(name, "repo.desc"))
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ctx.repo->desc = xstrdup(value);
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else if (ctx.repo && !strcmp(name, "repo.owner"))
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ctx.repo->owner = xstrdup(value);
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else if (ctx.repo && !strcmp(name, "repo.defbranch"))
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ctx.repo->defbranch = xstrdup(value);
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else if (ctx.repo && !strcmp(name, "repo.snapshots"))
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ctx.repo->snapshots = ctx.cfg.snapshots & cgit_parse_snapshots_mask(value); /* XXX: &? */
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else if (ctx.repo && !strcmp(name, "repo.enable-log-filecount"))
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ctx.repo->enable_log_filecount = ctx.cfg.enable_log_filecount * atoi(value);
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else if (ctx.repo && !strcmp(name, "repo.enable-log-linecount"))
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ctx.repo->enable_log_linecount = ctx.cfg.enable_log_linecount * atoi(value);
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else if (ctx.repo && !strcmp(name, "repo.module-link"))
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ctx.repo->module_link= xstrdup(value);
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else if (ctx.repo && !strcmp(name, "repo.readme") && value != NULL) {
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if (*value == '/')
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ctx.repo->readme = xstrdup(value);
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else
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ctx.repo->readme = xstrdup(fmt("%s/%s", ctx.repo->path, value));
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} else if (!strcmp(name, "include"))
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parse_configfile(value, config_cb);
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}
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static void querystring_cb(const char *name, const char *value)
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{
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if (!strcmp(name,"r")) {
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ctx.qry.repo = xstrdup(value);
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ctx.repo = cgit_get_repoinfo(value);
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} else if (!strcmp(name, "p")) {
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ctx.qry.page = xstrdup(value);
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} else if (!strcmp(name, "url")) {
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cgit_parse_url(value);
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} else if (!strcmp(name, "qt")) {
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ctx.qry.grep = xstrdup(value);
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} else if (!strcmp(name, "q")) {
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ctx.qry.search = xstrdup(value);
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} else if (!strcmp(name, "h")) {
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ctx.qry.head = xstrdup(value);
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ctx.qry.has_symref = 1;
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} else if (!strcmp(name, "id")) {
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ctx.qry.sha1 = xstrdup(value);
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ctx.qry.has_sha1 = 1;
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} else if (!strcmp(name, "id2")) {
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ctx.qry.sha2 = xstrdup(value);
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ctx.qry.has_sha1 = 1;
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} else if (!strcmp(name, "ofs")) {
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ctx.qry.ofs = atoi(value);
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} else if (!strcmp(name, "path")) {
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ctx.qry.path = trim_end(value, '/');
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} else if (!strcmp(name, "name")) {
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ctx.qry.name = xstrdup(value);
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}
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}
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static void prepare_context(struct cgit_context *ctx)
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{
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memset(ctx, 0, sizeof(ctx));
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ctx->cfg.agefile = "info/web/last-modified";
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ctx->cfg.nocache = 0;
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ctx->cfg.cache_size = 0;
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ctx->cfg.cache_dynamic_ttl = 5;
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ctx->cfg.cache_max_create_time = 5;
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ctx->cfg.cache_repo_ttl = 5;
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ctx->cfg.cache_root = CGIT_CACHE_ROOT;
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ctx->cfg.cache_root_ttl = 5;
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ctx->cfg.cache_static_ttl = -1;
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ctx->cfg.css = "/cgit.css";
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ctx->cfg.logo = "/git-logo.png";
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ctx->cfg.max_commit_count = 50;
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ctx->cfg.max_lock_attempts = 5;
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ctx->cfg.max_msg_len = 60;
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ctx->cfg.max_repodesc_len = 60;
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ctx->cfg.module_link = "./?repo=%s&page=commit&id=%s";
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ctx->cfg.renamelimit = -1;
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ctx->cfg.robots = "index, nofollow";
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ctx->cfg.root_title = "Git repository browser";
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ctx->cfg.script_name = CGIT_SCRIPT_NAME;
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ctx->page.mimetype = "text/html";
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ctx->page.charset = PAGE_ENCODING;
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ctx->page.filename = NULL;
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ctx->page.modified = time(NULL);
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ctx->page.expires = ctx->page.modified;
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}
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struct refmatch {
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char *req_ref;
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char *first_ref;
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int match;
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};
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int find_current_ref(const char *refname, const unsigned char *sha1,
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int flags, void *cb_data)
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{
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struct refmatch *info;
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info = (struct refmatch *)cb_data;
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if (!strcmp(refname, info->req_ref))
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info->match = 1;
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if (!info->first_ref)
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info->first_ref = xstrdup(refname);
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return info->match;
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}
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char *find_default_branch(struct cgit_repo *repo)
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{
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struct refmatch info;
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info.req_ref = repo->defbranch;
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info.first_ref = NULL;
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info.match = 0;
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for_each_branch_ref(find_current_ref, &info);
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if (info.match)
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return info.req_ref;
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else
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return info.first_ref;
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}
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static int prepare_repo_cmd(struct cgit_context *ctx)
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{
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char *tmp;
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unsigned char sha1[20];
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int nongit = 0;
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setenv("GIT_DIR", ctx->repo->path, 1);
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setup_git_directory_gently(&nongit);
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if (nongit) {
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ctx->page.title = fmt("%s - %s", ctx->cfg.root_title,
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"config error");
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tmp = fmt("Not a git repository: '%s'", ctx->repo->path);
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ctx->repo = NULL;
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cgit_print_http_headers(ctx);
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cgit_print_docstart(ctx);
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cgit_print_pageheader(ctx);
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cgit_print_error(tmp);
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cgit_print_docend();
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return 1;
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}
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ctx->page.title = fmt("%s - %s", ctx->repo->name, ctx->repo->desc);
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if (!ctx->qry.head) {
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ctx->qry.head = xstrdup(find_default_branch(ctx->repo));
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ctx->repo->defbranch = ctx->qry.head;
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}
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if (!ctx->qry.head) {
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cgit_print_http_headers(ctx);
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cgit_print_docstart(ctx);
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cgit_print_pageheader(ctx);
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cgit_print_error("Repository seems to be empty");
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cgit_print_docend();
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return 1;
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}
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if (get_sha1(ctx->qry.head, sha1)) {
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tmp = xstrdup(ctx->qry.head);
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ctx->qry.head = ctx->repo->defbranch;
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cgit_print_http_headers(ctx);
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cgit_print_docstart(ctx);
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cgit_print_pageheader(ctx);
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cgit_print_error(fmt("Invalid branch: %s", tmp));
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cgit_print_docend();
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return 1;
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}
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return 0;
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}
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static void process_request(void *cbdata)
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{
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struct cgit_context *ctx = cbdata;
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struct cgit_cmd *cmd;
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cmd = cgit_get_cmd(ctx);
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if (!cmd) {
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ctx->page.title = "cgit error";
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ctx->repo = NULL;
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cgit_print_http_headers(ctx);
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cgit_print_docstart(ctx);
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cgit_print_pageheader(ctx);
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cgit_print_error("Invalid request");
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cgit_print_docend();
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return;
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}
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if (cmd->want_repo && prepare_repo_cmd(ctx))
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return;
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if (cmd->want_layout) {
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cgit_print_http_headers(ctx);
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cgit_print_docstart(ctx);
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cgit_print_pageheader(ctx);
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}
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cmd->fn(ctx);
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if (cmd->want_layout)
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cgit_print_docend();
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}
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static void cgit_parse_args(int argc, const char **argv)
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{
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int i;
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for (i = 1; i < argc; i++) {
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if (!strncmp(argv[i], "--cache=", 8)) {
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ctx.cfg.cache_root = xstrdup(argv[i]+8);
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}
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if (!strcmp(argv[i], "--nocache")) {
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ctx.cfg.nocache = 1;
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}
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if (!strncmp(argv[i], "--query=", 8)) {
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ctx.qry.raw = xstrdup(argv[i]+8);
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}
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if (!strncmp(argv[i], "--repo=", 7)) {
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ctx.qry.repo = xstrdup(argv[i]+7);
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}
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if (!strncmp(argv[i], "--page=", 7)) {
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ctx.qry.page = xstrdup(argv[i]+7);
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}
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if (!strncmp(argv[i], "--head=", 7)) {
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ctx.qry.head = xstrdup(argv[i]+7);
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ctx.qry.has_symref = 1;
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}
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if (!strncmp(argv[i], "--sha1=", 7)) {
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ctx.qry.sha1 = xstrdup(argv[i]+7);
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ctx.qry.has_sha1 = 1;
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}
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if (!strncmp(argv[i], "--ofs=", 6)) {
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ctx.qry.ofs = atoi(argv[i]+6);
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}
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}
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}
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static int calc_ttl()
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{
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if (!ctx.repo)
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return ctx.cfg.cache_root_ttl;
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if (!ctx.qry.page)
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return ctx.cfg.cache_repo_ttl;
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if (ctx.qry.has_symref)
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return ctx.cfg.cache_dynamic_ttl;
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if (ctx.qry.has_sha1)
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return ctx.cfg.cache_static_ttl;
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return ctx.cfg.cache_repo_ttl;
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}
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int main(int argc, const char **argv)
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{
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const char *cgit_config_env = getenv("CGIT_CONFIG");
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int err, ttl;
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prepare_context(&ctx);
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cgit_repolist.length = 0;
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cgit_repolist.count = 0;
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cgit_repolist.repos = NULL;
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parse_configfile(cgit_config_env ? cgit_config_env : CGIT_CONFIG,
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config_cb);
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ctx.repo = NULL;
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if (getenv("SCRIPT_NAME"))
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ctx.cfg.script_name = xstrdup(getenv("SCRIPT_NAME"));
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if (getenv("QUERY_STRING"))
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ctx.qry.raw = xstrdup(getenv("QUERY_STRING"));
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cgit_parse_args(argc, argv);
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http_parse_querystring(ctx.qry.raw, querystring_cb);
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ttl = calc_ttl();
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ctx.page.expires += ttl*60;
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if (ctx.cfg.nocache)
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ctx.cfg.cache_size = 0;
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err = cache_process(ctx.cfg.cache_size, ctx.cfg.cache_root,
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ctx.qry.raw, ttl, process_request, &ctx);
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if (err)
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cache_log("[cgit] error %d - %s\n",
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err, strerror(err));
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return err;
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}
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