]> git.vanrenterghem.biz Git - git.ikiwiki.info.git/blobdiff - IkiWiki/Wrapper.pm
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[git.ikiwiki.info.git] / IkiWiki / Wrapper.pm
index 769540d29ac3de34715436ead21416747d3b09b4..84b4b5a2f298f23bac5d5e223fb4144a7ebd72f1 100644 (file)
@@ -28,10 +28,11 @@ sub gen_wrappers () {
        %config=(%origconfig);
 }
 
+our $program_to_wrap = $0;
 sub gen_wrapper () {
        $config{srcdir}=File::Spec->rel2abs($config{srcdir});
        $config{destdir}=File::Spec->rel2abs($config{destdir});
-       my $this=File::Spec->rel2abs($0);
+       my $this=File::Spec->rel2abs($program_to_wrap);
        if (! -x $this) {
                error(sprintf(gettext("%s doesn't seem to be executable"), $this));
        }
@@ -93,12 +94,53 @@ EOF
                # memory, a pile up of processes could cause thrashing
                # otherwise. The fd of the lock is stored in
                # IKIWIKI_CGILOCK_FD so unlockwiki can close it.
-               $pre_exec=<<"EOF";
+               #
+               # A lot of cgi wrapper processes can potentially build
+               # up and clog an otherwise unloaded web server. To
+               # partially avoid this, when a GET comes in and the lock
+               # is already held, rather than blocking a html page is
+               # constructed that retries. This is enabled by setting
+               # cgi_overload_delay.
+               if (defined $config{cgi_overload_delay} &&
+                   $config{cgi_overload_delay} =~/^[0-9]+/) {
+                       my $i=int($config{cgi_overload_delay});
+                       $pre_exec.="#define CGI_OVERLOAD_DELAY $i\n"
+                               if $i > 0;
+                       my $msg=gettext("Please wait");
+                       $msg=~s/"/\\"/g;
+                       $pre_exec.='#define CGI_PLEASE_WAIT_TITLE "'.$msg."\"\n";
+                       if (defined $config{cgi_overload_message} && length $config{cgi_overload_message}) {
+                               $msg=$config{cgi_overload_message};
+                               $msg=~s/"/\\"/g;
+                       }
+                       $pre_exec.='#define CGI_PLEASE_WAIT_BODY "'.$msg."\"\n";
+               }
+               $pre_exec.=<<"EOF";
        lockfd=open("$config{wikistatedir}/cgilock", O_CREAT | O_RDWR, 0666);
-       if (lockfd != -1 && lockf(lockfd, F_LOCK, 0) == 0) {
-               char *fd_s=malloc(8);
-               sprintf(fd_s, "%i", lockfd);
-               setenv("IKIWIKI_CGILOCK_FD", fd_s, 1);
+       if (lockfd != -1) {
+#ifdef CGI_OVERLOAD_DELAY
+               char *request_method = getenv("REQUEST_METHOD");
+               if (request_method && strcmp(request_method, "GET") == 0) {
+                       if (lockf(lockfd, F_TLOCK, 0) == 0) {
+                               set_cgilock_fd(lockfd);
+                       }
+                       else {
+                               printf("Content-Type: text/html\\nRefresh: %i; URL=%s\\n\\n<html><head><title>%s</title><head><body><p>%s</p></body></html>",
+                                       CGI_OVERLOAD_DELAY,
+                                       getenv("REQUEST_URI"),
+                                       CGI_PLEASE_WAIT_TITLE,
+                                       CGI_PLEASE_WAIT_BODY);
+                               exit(0);
+                       }
+               }
+               else if (lockf(lockfd, F_LOCK, 0) == 0) {
+                       set_cgilock_fd(lockfd);
+               }
+#else
+               if (lockf(lockfd, F_LOCK, 0) == 0) {
+                       set_cgilock_fd(lockfd);
+               }
+#endif
        }
 EOF
        }
@@ -140,6 +182,12 @@ void addenv(char *var, char *val) {
        newenviron[i++]=s;
 }
 
+set_cgilock_fd (int lockfd) {
+       char *fd_s=malloc(8);
+       sprintf(fd_s, "%i", lockfd);
+       setenv("IKIWIKI_CGILOCK_FD", fd_s, 1);
+}
+
 int main (int argc, char **argv) {
        int lockfd=-1;
        char *s;