(no commit message)

[ikiwiki.git] / IkiWiki / Wrapper.pm

diff --git a/IkiWiki/Wrapper.pm b/IkiWiki/Wrapper.pm
index 84cc7540bbfa5e63b8d9d85d21cc0b0d63bbb478..4c99cdaa0b670080ac8548e8d95de91b7b74de07 100644 (file)
--- a/IkiWiki/Wrapper.pm
+++ b/IkiWiki/Wrapper.pm
@@ -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));
        }
@@ -49,8 +50,9 @@ sub gen_wrapper () {
        push @envsave, qw{REMOTE_ADDR QUERY_STRING REQUEST_METHOD REQUEST_URI
                       CONTENT_TYPE CONTENT_LENGTH GATEWAY_INTERFACE
                       HTTP_COOKIE REMOTE_USER HTTPS REDIRECT_STATUS
-                      HTTP_HOST SERVER_PORT HTTPS
+                      HTTP_HOST SERVER_PORT HTTPS HTTP_ACCEPT
                       REDIRECT_URL} if $config{cgi};
+       my $envsize=$#envsave;
        my $envsave="";
        foreach my $var (@envsave) {
                $envsave.=<<"EOF";
@@ -58,6 +60,18 @@ sub gen_wrapper () {
                addenv("$var", s);
 EOF
        }
+       if (ref $config{ENV} eq 'HASH') {
+               foreach my $key (keys %{$config{ENV}}) {
+                       my $val=$config{ENV}{$key};
+                       utf8::encode($val) if utf8::is_utf8($val);
+                       $val =~ s/([^A-Za-z0-9])/sprintf '""\\x%02x""', ord($1)/ge;
+                       $envsize += 1;
+                       $envsave.=<<"EOF";
+       addenv("$key", "$val");
+EOF
+               }
+               delete $config{ENV};
+       }
        
        my @wrapper_hooks;
        run_hooks(genwrapper => sub { push @wrapper_hooks, shift->() });
@@ -93,12 +107,53 @@ 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 && flock(lockfd, LOCK_EX) == 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
        }
@@ -129,7 +184,7 @@ EOF
 #include <sys/file.h>
 
 extern char **environ;
-char *newenviron[$#envsave+7];
+char *newenviron[$envsize+7];
 int i=0;
 
 void addenv(char *var, char *val) {
@@ -140,6 +195,12 @@ void addenv(char *var, char *val) {
        newenviron[i++]=s;
 }
 
+void 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;
@@ -214,7 +275,7 @@ $set_background_command
 EOF
 
        my @cc=exists $ENV{CC} ? possibly_foolish_untaint($ENV{CC}) : 'cc';
-       push @cc, possibly_foolish_untaint($ENV{CFLAGS}) if exists $ENV{CFLAGS};
+       push @cc, split(' ', possibly_foolish_untaint($ENV{CFLAGS})) if exists $ENV{CFLAGS};
        if (system(@cc, "$wrapper.c", "-o", "$wrapper.new") != 0) {
                #translators: The parameter is a C filename.
                error(sprintf(gettext("failed to compile %s"), "$wrapper.c"));
@@ -237,8 +298,7 @@ EOF
                error("rename $wrapper.new $wrapper: $!");
        }
        #translators: The parameter is a filename.
-       printf(gettext("successfully generated %s"), $wrapper);
-       print "\n";
+       debug(sprintf(gettext("successfully generated %s"), $wrapper));
 }
 
 1