TextException.cc
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1/*
2 * Copyright (C) 1996-2022 The Squid Software Foundation and contributors
3 *
4 * Squid software is distributed under GPLv2+ license and includes
5 * contributions from numerous individuals and organizations.
6 * Please see the COPYING and CONTRIBUTORS files for details.
7 */
8
9#include "squid.h"
10#include "base/TextException.h"
11#include "sbuf/SBuf.h"
12
13#include <iostream>
14#include <sstream>
15#include <unordered_map>
16
18typedef std::runtime_error WhatString;
19
21typedef std::unordered_multimap<const void*, WhatString> WhatStrings;
22
24static WhatStrings *WhatStrings_ = nullptr;
25
27 TextException(message.c_str(), location)
28{}
29
31{
32 if (WhatStrings_)
33 WhatStrings_->erase(this); // there only if what() has been called
34}
35
36std::ostream &
37TextException::print(std::ostream &os) const
38{
39 os << std::runtime_error::what() <<
40 Debug::Extra << "exception location: " << where;
41 // TODO: ...error_detail: " << (ERR_DETAIL_EXCEPTION_START+id());
42 return os;
43}
44
45const char *
46TextException::what() const throw()
47{
48 std::ostringstream os;
49 print(os);
50 const WhatString result(os.str());
51
52 // extend result.c_str() lifetime to this object lifetime
53 if (!WhatStrings_)
55 // *this could change, but we must preserve old results for they may be used
56 WhatStrings_->emplace(std::make_pair(this, result));
57
58 return result.what();
59}
60
61std::ostream &
62operator <<(std::ostream &os, const TextException &ex)
63{
64 ex.print(os);
65 return os;
66}
67
68std::ostream &
69CurrentException(std::ostream &os)
70{
71 if (std::current_exception()) {
72 try {
73 throw; // re-throw to recognize the exception type
74 }
75 catch (const TextException &ex) {
76 os << ex; // optimization: this is a lot cheaper than what() below
77 }
78 catch (const std::exception &ex) {
79 os << ex.what();
80 }
81 catch (...) {
82 os << "[unknown exception type]";
83 }
84 } else {
85 os << "[no active exception]";
86 }
87 return os;
88}
89
std::runtime_error WhatString
a standard CoW string; avoids noise and circular dependencies of SBuf
std::unordered_multimap< const void *, WhatString > WhatStrings
a collection of strings indexed by pointers to their creator objects
static WhatStrings * WhatStrings_
requested what() strings of alive TextException objects
std::ostream & CurrentException(std::ostream &os)
prints active (i.e., thrown but not yet handled) exception
std::ostream & operator<<(std::ostream &os, const TextException &ex)
efficiently prints TextException
static std::ostream & Extra(std::ostream &os)
prefixes each grouped debugs() line after the first one in the group
Definition: Stream.h:117
Definition: SBuf.h:94
a source code location that is cheap to create, copy, and store
Definition: Here.h:30
an std::runtime_error with thrower location info
Definition: TextException.h:21
SourceLocation where
code location related to the exception; usually the thrower location
Definition: TextException.h:46
virtual ~TextException() override
virtual const char * what() const override
std::ostream & print(std::ostream &) const
dumps the exception text into the stream
TextException(const char *message, const SourceLocation &location)
Definition: TextException.h:24

 

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