net_reader: fix single NNTP article fetch, test ranges

While NNTP ranges was already working, fetching a single message
was broken.  We'll also simplify the code a bit and ensure
incremental synchronization is ignored when ranges are
specified.

3 files changed, 38 insertions, 6 deletions

diff --git a/lib/PublicInbox/NetReader.pm b/lib/PublicInbox/NetReader.pm
index 30b8f810..236e824c 100644
--- a/lib/PublicInbox/NetReader.pm
+++ b/lib/PublicInbox/NetReader.pm
@@ -725,21 +725,24 @@ sub _nntp_fetch_all ($$$) {
                 my $msg = ndump($nn->message);
                 return "E: GROUP $group <$sec> $msg";
         }
+        (defined($num_a) && defined($num_b) && $num_a > $num_b) and
+                return "E: $uri: backwards range: $num_a > $num_b";
 
         # IMAPTracker is also used for tracking NNTP, UID == article number
         # LIST.ACTIVE can get the equivalent of UIDVALIDITY, but that's
         # expensive.  So we assume newsgroups don't change:
         my ($itrk, $l_art) = itrk_last($self, $uri);
 
-        # allow users to specify articles to refetch
-        # cf. https://tools.ietf.org/id/draft-gilman-news-url-01.txt
-        # nntp://example.com/inbox.foo/$num_a-$num_b
-        $beg = $num_a if defined($num_a) && $num_a < $beg;
-        $end = $num_b if defined($num_b) && $num_b < $end;
-        if (defined $l_art) {
+        if (defined($l_art) && !defined($num_a)) {
                 return if $l_art >= $end; # nothing to do
                 $beg = $l_art + 1;
         }
+        # allow users to specify articles to refetch
+        # cf. https://tools.ietf.org/id/draft-gilman-news-url-01.txt
+        # nntp://example.com/inbox.foo/$num_a-$num_b
+        $beg = $num_a if defined($num_a) && $num_a > $beg && $num_a <= $end;
+        $end = $num_b if defined($num_b) && $num_b >= $beg && $num_b < $end;
+        $end = $beg if defined($num_a) && !defined($num_b);
         my ($err, $art, $last_art, $kw); # kw stays undef, no keywords in NNTP
         unless ($self->{quiet}) {
                 warn "# $uri fetching ARTICLE $beg..$end\n";
diff --git a/t/lei-import-nntp.t b/t/lei-import-nntp.t
index f2c35406..1eb41e0e 100644
--- a/t/lei-import-nntp.t
+++ b/t/lei-import-nntp.t
@@ -37,5 +37,31 @@ test_lei({ tmpdir => $tmpdir }, sub {
         ok(-s $f, 'mail_sync exists tracked for redundant imports');
         lei_ok 'ls-mail-sync';
         like($lei_out, qr!\A\Q$url\E\n\z!, 'ls-mail-sync output as-expected');
+
+        ok(!lei(qw(import), "$url/12-1"), 'backwards range rejected');
+
+        # new home
+        local $ENV{HOME} = "$tmpdir/h2";
+        lei_ok(qw(ls-mail-source -l), $url);
+        my $ls = json_utf8->decode($lei_out);
+        my ($high, $low) = @{$ls->[0]}{qw(high low)};
+        ok($high > $low, 'high > low');
+
+        my $end = $high - 1;
+        lei_ok qw(import), "$url/$high";
+        lei_ok qw(q z:0..); my $one = json_utf8->decode($lei_out);
+        pop @$one; # trailing null
+        is(scalar(@$one), 1, 'only 1 result');
+
+        local $ENV{HOME} = "$tmpdir/h3";
+        lei_ok qw(import), "$url/$low-$end";
+        lei_ok qw(q z:0..); my $start = json_utf8->decode($lei_out);
+        pop @$start; # trailing null
+        is(scalar(@$start), scalar(map { $_ } ($low..$end)),
+                'range worked as expected');
+        my %seen;
+        for (@$start, @$one) {
+                is($seen{$_->{blob}}++, 0, "blob $_->{blob} seen once");
+        }
 });
 done_testing;
diff --git a/t/uri_nntps.t b/t/uri_nntps.t
index babd8088..6b123a9b 100644
--- a/t/uri_nntps.t
+++ b/t/uri_nntps.t
@@ -37,4 +37,7 @@ is(PublicInbox::URInntps->new('nntps://0:563/')->canonical->as_string,
 $uri = PublicInbox::URInntps->new('nntps://NSA:Hunter2@0/inbox');
 is($uri->userinfo, 'NSA:Hunter2', 'userinfo accepted w/ pass');
 
+$uri = PublicInbox::URInntps->new('nntps://NSA:Hunter2@0/inbox.test/9-10');
+is_deeply([$uri->group], [ 'inbox.test', 9, 10 ], 'ranges work');
+
 done_testing;