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/** @file
A brief file description
@section license License
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/****************************************************************************
Show.h
****************************************************************************/
#ifndef _Show_h_
#define _Show_h_
#include "StatPages.h"
#define STREQ_PREFIX(_x, _s) (!strncasecmp(_x, _s, sizeof(_s) - 1))
struct ShowCont;
typedef int (ShowCont::*ShowContEventHandler)(int event, Event *data);
struct ShowCont : public Continuation {
private:
char *buf, *start, *ebuf;
public:
Action action;
char *sarg;
int
show(const char *s, ...)
{
va_list aap, va_scratch;
ptrdiff_t avail = ebuf - buf;
ptrdiff_t needed;
va_start(aap, s);
va_copy(va_scratch, aap);
needed = vsnprintf(buf, avail, s, va_scratch);
va_end(va_scratch);
if (needed >= avail) {
ptrdiff_t bufsz = ebuf - start;
ptrdiff_t used = buf - start;
Debug("cache_inspector", "needed %d bytes, reallocating to %d bytes", (int)needed, (int)bufsz + (int)needed);
bufsz += ROUNDUP(needed, ats_pagesize());
start = (char *)ats_realloc(start, bufsz);
ebuf = start + bufsz;
buf = start + used;
avail = ebuf - buf;
needed = vsnprintf(buf, avail, s, aap);
va_end(aap);
if (needed >= avail) {
Debug("cache_inspector", "needed %d bytes, but had only %d", (int)needed, (int)avail + (int)needed);
return EVENT_DONE;
}
}
buf += needed;
return EVENT_CONT;
}
#define CHECK_SHOW(_x) \
if (_x == EVENT_DONE) \
return complete_error(event, e);
int
finishConn(int event, Event *e)
{
if (!action.cancelled) {
StatPageData data(start, buf - start);
action.continuation->handleEvent(STAT_PAGE_SUCCESS, &data);
start = 0;
} else {
ats_free(start);
start = NULL;
}
return done(VIO::CLOSE, event, e);
}
int
complete(int event, Event *e)
{
CHECK_SHOW(show("</BODY>\n</HTML>\n"));
return finishConn(event, e);
}
int
completeJson(int event, Event *e)
{
return finishConn(event, e);
}
int
complete_error(int event, Event *e)
{
ats_free(start);
start = NULL;
if (!action.cancelled)
action.continuation->handleEvent(STAT_PAGE_FAILURE, NULL);
return done(VIO::ABORT, event, e);
}
int
begin(const char *name)
{
return show("<HTML>\n<HEAD><TITLE>%s</TITLE>\n"
"<BODY BGCOLOR=\"#ffffff\" FGCOLOR=\"#00ff00\">\n"
"<H1>%s</H1>\n",
name, name);
}
int
showError(int event, Event *e)
{
return complete_error(event, e);
}
virtual int
done(int /* e ATS_UNUSED */, int /* event ATS_UNUSED */, void * /* data ATS_UNUSED */)
{
delete this;
return EVENT_DONE;
}
ShowCont(Continuation *c, HTTPHdr * /* h ATS_UNUSED */) : Continuation(NULL), sarg(0)
{
size_t sz = ats_pagesize();
mutex = c->mutex;
action = c;
buf = (char *)ats_malloc(sz);
start = buf;
ebuf = buf + sz;
}
~ShowCont()
{
ats_free(sarg);
ats_free(start);
}
};
#endif