Bug 16783 – std.net.curl application throws an exception

I try to compile this program from std.net.curl import std.net.curl, std.stdio; void main() { auto range1 = byLineAsync("www.google.com"); auto range2 = byLineAsync("www.wikipedia.org"); foreach (line; byLineAsync("dlang.org")) writeln(line); foreach (line; range1) writeln(line); foreach (line; range2) writeln(line); } I compile this program like this. $ dmd internet.d -ofinternet or dmd -I/usr/include/dmd/phobos -L-l:libcurl.so.4.2.0 internet.d -ofinternet The program compiles fine but it throws an exception. std.concurrency.PriorityMessageException@std/concurrency.d(273): Priority message ---------------- ??:? _D3std11concurrency10MessageBox160__T3getTDFS3std11concurrency3TidS3std3net4curl21__T11CurlMessageTAyaZ11CurlMessageZbTDFS3std11concurrency3TidS3std3net4curl19__T11CurlMessageTbZ11CurlMessageZbZ3getMFDFS3std11concurrency3TidS3std3net4curl21__T11CurlMessageTAyaZ11CurlMessageZbDFS3std11concurrency3TidS3std3net4curl19__T11CurlMessageTbZ11CurlMessageZbZ3ptyMFKS3std11concurrency36__T4ListTS3std11concurrency7MessageZ4ListZb [0x81d03f4] ??:? bool std.concurrency.MessageBox.get!(bool delegate(std.concurrency.Tid, std.net.curl.CurlMessage!(immutable(char)[]).CurlMessage), bool delegate(std.concurrency.Tid, std.net.curl.CurlMessage!(bool).CurlMessage)).get(bool delegate(std.concurrency.Tid, std.net.curl.CurlMessage!(immutable(char)[]).CurlMessage), bool delegate(std.concurrency.Tid, std.net.curl.CurlMessage!(bool).CurlMessage)) [0x81cfeed] ??:? void std.concurrency.receive!(bool delegate(std.concurrency.Tid, std.net.curl.CurlMessage!(immutable(char)[]).CurlMessage), bool delegate(std.concurrency.Tid, std.net.curl.CurlMessage!(bool).CurlMessage)).receive(bool delegate(std.concurrency.Tid, std.net.curl.CurlMessage!(immutable(char)[]).CurlMessage), bool delegate(std.concurrency.Tid, std.net.curl.CurlMessage!(bool).CurlMessage)) [0x81cfd08] ??:? void std.net.curl.AsyncLineInputRange!(char).AsyncLineInputRange.__mixin5.tryEnsureUnits() [0x81ccb87] ??:? @property bool std.net.curl.AsyncLineInputRange!(char).AsyncLineInputRange.__mixin5.empty() [0x81cc7db] ??:? _Dmain [0x81b47b8] ??:? _D2rt6dmain211_d_run_mainUiPPaPUAAaZiZ6runAllMFZ9__lambda1MFZv [0x81d9292] ??:? void rt.dmain2._d_run_main(int, char**, extern (C) int function(char[][])*).tryExec(scope void delegate()) [0x81d91dc] ??:? void rt.dmain2._d_run_main(int, char**, extern (C) int function(char[][])*).runAll() [0x81d924e] ??:? void rt.dmain2._d_run_main(int, char**, extern (C) int function(char[][])*).tryExec(scope void delegate()) [0x81d91dc] ??:? _d_run_main [0x81d916e] ??:? main [0x81d3393] ??:? __libc_start_main [0x129532] Sometimes it prints the web page's html content as expected but again it throws this exception. Steps to Reproduce: 1) Run Ubuntu 12.04 from memory stick. 2) Fresh install dmd 3) Try to compile and run program. $ dmd -v DMD32 D Compiler v2.072.0 Ubuntu 12.04 LTS

Cannot reproduce on Ubuntu 16.04 LTS 64-bit, latest version of the compiler : DMD64 D Compiler v2.073.0-devel-878b882.

I may reproduce this bug on Ubuntu 12.04 64 bit. $ dmd -v DMD64 D Compiler v2.072.1 Also I should be able to use arsd.curl library without any problems. https://github.com/adamdruppe/arsd/blob/master/curl.d

I ran your program 15x on my machine with 2.074.0 and 2.075.0-b4 and couldn't reproduce this. Closing this as WORKSFORME then - please reopen if this is still an issue for you with the latest release.

I may reproduce this bug on Ubuntu 16.04.2 LTS 64 bit. I compile the program like this. $ dmd internet.d -ofinternet Output : $ ./internet std.concurrency.PriorityMessageException@std/concurrency.d(269): Priority message ---------------- ??:? _D3std11concurrency10MessageBox160__T3getTDFS3std11concurrency3TidS3std3net4curl21__T11CurlMessageTAyaZ11CurlMessageZbTDFS3std11concurrency3TidS3std3net4curl19__T11CurlMessageTbZ11CurlMessageZbZ3getMFMDFS3std11concurrency3TidS3std3net4curl21__T11CurlMessageTAyaZ11CurlMessageZbMDFS3std11concurrency3TidS3std3net4curl19__T11CurlMessageTbZ11CurlMessageZbZ3ptyMFKS3std11concurrency36__T4ListTS3std11concurrency7MessageZ4ListZb [0x59f9ca] ??:? bool std.concurrency.MessageBox.get!(bool delegate(std.concurrency.Tid, std.net.curl.CurlMessage!(immutable(char)[]).CurlMessage), bool delegate(std.concurrency.Tid, std.net.curl.CurlMessage!(bool).CurlMessage)).get(scope bool delegate(std.concurrency.Tid, std.net.curl.CurlMessage!(immutable(char)[]).CurlMessage), scope bool delegate(std.concurrency.Tid, std.net.curl.CurlMessage!(bool).CurlMessage)) [0x59f406] ??:? void std.concurrency.receive!(bool delegate(std.concurrency.Tid, std.net.curl.CurlMessage!(immutable(char)[]).CurlMessage), bool delegate(std.concurrency.Tid, std.net.curl.CurlMessage!(bool).CurlMessage)).receive(bool delegate(std.concurrency.Tid, std.net.curl.CurlMessage!(immutable(char)[]).CurlMessage), bool delegate(std.concurrency.Tid, std.net.curl.CurlMessage!(bool).CurlMessage)) [0x59f1cd] ??:? void std.net.curl.AsyncLineInputRange!(char).AsyncLineInputRange.__mixin5.tryEnsureUnits() [0x59b5a0] ??:? @property bool std.net.curl.AsyncLineInputRange!(char).AsyncLineInputRange.__mixin5.empty() [0x59b148] ??:? _Dmain [0x57fc6b] ??:? _D2rt6dmain211_d_run_mainUiPPaPUAAaZiZ6runAllMFZ9__lambda1MFNlZv [0x5aa353] ??:? scope void rt.dmain2._d_run_main(int, char**, extern (C) int function(char[][])*).tryExec(scope void delegate()) [0x5aa283] ??:? scope void rt.dmain2._d_run_main(int, char**, extern (C) int function(char[][])*).runAll() [0x5aa2fc] ??:? scope void rt.dmain2._d_run_main(int, char**, extern (C) int function(char[][])*).tryExec(scope void delegate()) [0x5aa283] ??:? _d_run_main [0x5aa1f3] ??:? main [0x5a4407] ??:? __libc_start_main [0xd7fb382f] erdem@erdem:~/Masaüstü$ ./internet std.concurrency.PriorityMessageException@std/concurrency.d(269): Priority message ---------------- ??:? _D3std11concurrency10MessageBox160__T3getTDFS3std11concurrency3TidS3std3net4curl21__T11CurlMessageTAyaZ11CurlMessageZbTDFS3std11concurrency3TidS3std3net4curl19__T11CurlMessageTbZ11CurlMessageZbZ3getMFMDFS3std11concurrency3TidS3std3net4curl21__T11CurlMessageTAyaZ11CurlMessageZbMDFS3std11concurrency3TidS3std3net4curl19__T11CurlMessageTbZ11CurlMessageZbZ3ptyMFKS3std11concurrency36__T4ListTS3std11concurrency7MessageZ4ListZb [0x59f9ca] ??:? bool std.concurrency.MessageBox.get!(bool delegate(std.concurrency.Tid, std.net.curl.CurlMessage!(immutable(char)[]).CurlMessage), bool delegate(std.concurrency.Tid, std.net.curl.CurlMessage!(bool).CurlMessage)).get(scope bool delegate(std.concurrency.Tid, std.net.curl.CurlMessage!(immutable(char)[]).CurlMessage), scope bool delegate(std.concurrency.Tid, std.net.curl.CurlMessage!(bool).CurlMessage)) [0x59f406] ??:? void std.concurrency.receive!(bool delegate(std.concurrency.Tid, std.net.curl.CurlMessage!(immutable(char)[]).CurlMessage), bool delegate(std.concurrency.Tid, std.net.curl.CurlMessage!(bool).CurlMessage)).receive(bool delegate(std.concurrency.Tid, std.net.curl.CurlMessage!(immutable(char)[]).CurlMessage), bool delegate(std.concurrency.Tid, std.net.curl.CurlMessage!(bool).CurlMessage)) [0x59f1cd] ??:? void std.net.curl.AsyncLineInputRange!(char).AsyncLineInputRange.__mixin5.tryEnsureUnits() [0x59b5a0] ??:? @property bool std.net.curl.AsyncLineInputRange!(char).AsyncLineInputRange.__mixin5.empty() [0x59b148] ??:? _Dmain [0x57fc6b] ??:? _D2rt6dmain211_d_run_mainUiPPaPUAAaZiZ6runAllMFZ9__lambda1MFNlZv [0x5aa353] ??:? scope void rt.dmain2._d_run_main(int, char**, extern (C) int function(char[][])*).tryExec(scope void delegate()) [0x5aa283] ??:? scope void rt.dmain2._d_run_main(int, char**, extern (C) int function(char[][])*).runAll() [0x5aa2fc] ??:? scope void rt.dmain2._d_run_main(int, char**, extern (C) int function(char[][])*).tryExec(scope void delegate()) [0x5aa283] ??:? _d_run_main [0x5aa1f3] ??:? main [0x5a4407] ??:? __libc_start_main [0x2b9a982f]

$ dmd -v DMD64 D Compiler v2.074.1

Easy to reproduce if URL is invalid or the server is down import std.net.curl, std.stdio; void main() { foreach (line; byLineAsync("dlang.org1")) writeln(line); } I think patch required to raise proper exception.

Some analysis: Function pty https://github.com/dlang/phobos/blob/master/std/concurrency.d#L2239 receives a VariantN containing a "std.net.curl.CurlException@/home/D/Repo/dmd/generated/linux/release/64/../../../../../phobos/std/net/curl.d(5279): Couldn't resolve host name on handle 5654F7BC4F50" but cannot convert this to Throwable and hence throws a PriorityMessageException. I think that the "convertsTo" check doesn't work correctly and thus does not throw this exception as expected. (I know too little about std.variant to continue here.) Further, I think, the PriorityMessageException could be improved to tell more details about its parameter "vals" in its message. Maybe super("Priority message: " ~ vals.stringof); would be better.

THIS ISSUE HAS BEEN MOVED TO GITHUB https://github.com/dlang/phobos/issues/10209 DO NOT COMMENT HERE ANYMORE, NOBODY WILL SEE IT, THIS ISSUE HAS BEEN MOVED TO GITHUB