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Improve 'coroutine has finished' error message

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This commit is contained in:
Eelco Dolstra 2018-08-21 15:22:04 +02:00
parent 6317c65937
commit ebe3d2d370
3 changed files with 16 additions and 7 deletions
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15
src/libutil/serialise.cc
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@ -161,16 +161,20 @@ size_t StringSource::read(unsigned char * data, size_t len)
#error Coroutines are broken in this version of Boost!
#endif
std::unique_ptr<Source> sinkToSource(std::function<void(Sink &)> fun)
std::unique_ptr<Source> sinkToSource(
std::function<void(Sink &)> fun,
std::function<void()> eof)
{
struct SinkToSource : Source
{
typedef boost::coroutines2::coroutine<std::string> coro_t;
std::function<void()> eof;
coro_t::pull_type coro;
SinkToSource(std::function<void(Sink &)> fun)
: coro([&](coro_t::push_type & yield) {
SinkToSource(std::function<void(Sink &)> fun, std::function<void()> eof)
: eof(eof)
, coro([&](coro_t::push_type & yield) {
LambdaSink sink([&](const unsigned char * data, size_t len) {
if (len) yield(std::string((const char *) data, len));
});
@ -184,8 +188,7 @@ std::unique_ptr<Source> sinkToSource(std::function<void(Sink &)> fun)
size_t read(unsigned char * data, size_t len) override
{
if (!coro)
throw EndOfFile("coroutine has finished");
if (!coro) { eof(); abort(); }
if (pos == cur.size()) {
if (!cur.empty()) coro();
@ -201,7 +204,7 @@ std::unique_ptr<Source> sinkToSource(std::function<void(Sink &)> fun)
}
};
return std::make_unique<SinkToSource>(fun);
return std::make_unique<SinkToSource>(fun, eof);
}

6
src/libutil/serialise.hh
View file

@ -214,7 +214,11 @@ struct LambdaSource : Source
/* Convert a function that feeds data into a Sink into a Source. The
Source executes the function as a coroutine. */
std::unique_ptr<Source> sinkToSource(std::function<void(Sink &)> fun);
std::unique_ptr<Source> sinkToSource(
std::function<void(Sink &)> fun,
std::function<void()> eof = []() {
throw EndOfFile("coroutine has finished");
});
void writePadding(size_t len, Sink & sink);