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Fix S3BinaryCacheStore

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It failed with

   AWS error uploading ‘6gaxphsyhg66mz0a00qghf9nqf7majs2.ls.xz’: Unable to parse ExceptionName: MissingContentLength Message: You must provide the Content-Length HTTP header.

possibly because the istringstream_nocopy introduced in
0d2ebb4373 doesn't supply the seek
method that the AWS library expects. So bring back the old version,
but only for S3BinaryCacheStore.
This commit is contained in:
Eelco Dolstra 2016-12-08 15:31:27 +01:00
parent 8df1a3b579
commit e6a61b8da7
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GPG key ID: 8170B4726D7198DE
4 changed files with 11 additions and 53 deletions
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51
src/libutil/util.hh
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@ -431,55 +431,4 @@ void callSuccess(
}
/* A variant of std::istringstream that doesn't copy its string
argument. This is useful for large strings. The caller must ensure
that the string object is not destroyed while it's referenced by
this object. */
class istringbuf_nocopy : public std::streambuf
{
const std::string & s;
decltype(s.size()) off;
decltype(s.size()) size;
public:
istringbuf_nocopy(const std::string & s) : s{s}, off{0}, size{s.size()}
{
}
private:
int_type underflow()
{
if (off == size)
return traits_type::eof();
return traits_type::to_int_type(s[off]);
}
int_type uflow()
{
if (off == size)
return traits_type::eof();
return traits_type::to_int_type(s[off++]);
}
int_type pbackfail(int_type ch)
{
if (off == 0 || (ch != traits_type::eof() && ch != s[off - 1]))
return traits_type::eof();
return traits_type::to_int_type(s[--off]);
}
std::streamsize showmanyc()
{
return size - off;
}
};
struct istringstream_nocopy : public std::iostream
{
istringbuf_nocopy buf;
istringstream_nocopy(const std::string & s) : std::iostream(&buf), buf(s) {};
};
}