| /** @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 |
| |
| |
| ****************************************************************************/ |
| |
| #pragma once |
| |
| #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 = nullptr; |
| } else { |
| ats_free(start); |
| start = nullptr; |
| } |
| 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 = nullptr; |
| if (!action.cancelled) { |
| action.continuation->handleEvent(STAT_PAGE_FAILURE, nullptr); |
| } |
| 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(nullptr), sarg(nullptr) |
| { |
| size_t sz = ats_pagesize(); |
| |
| mutex = c->mutex; |
| action = c; |
| buf = (char *)ats_malloc(sz); |
| start = buf; |
| ebuf = buf + sz; |
| } |
| |
| ~ShowCont() override |
| { |
| ats_free(sarg); |
| ats_free(start); |
| } |
| }; |
