notmuch/test/T640-database-modified.sh
David Bremner e0b22c139c lib: handle DatabaseModifiedError in _n_message_ensure_metadata
The retries are hardcoded to a small number, and error handling aborts
than propagating errors from notmuch_database_reopen. These are both
somewhat justified by the assumption that most things that can go
wrong in Xapian::Database::reopen are rare and fatal. Here's the brief
discussion with Xapian upstream:

   24-02-2017 08:12:57 < bremner> any intuition about how likely
      Xapian::Database::reopen is to fail? I'm catching a
      DatabaseModifiedError somewhere where handling any further errors is
      tricky, and wondering about treating a failed reopen as as "the
      impossible happened, stopping"

   24-02-2017 16:22:34 < olly> bremner: there should not be much scope for
    failure - stuff like out of memory or disk errors, which are probably a
    good enough excuse to stop
2017-02-25 21:13:50 -04:00

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#!/usr/bin/env bash
test_description="DatabaseModifiedError handling"
. ./test-lib.sh || exit 1
# add enough messages to trigger the exception
add_email_corpus
test_begin_subtest "catching DatabaseModifiedError in _notmuch_message_ensure_metadata"
# it seems to need to be an early document to trigger the exception
first_id=$(notmuch search --output=messages '*'| head -1 | sed s/^id://)
test_C ${MAIL_DIR} <<EOF
#include <unistd.h>
#include <stdlib.h>
#include <notmuch-test.h>
#include <talloc.h>
#include <assert.h>
int
main (int argc, char **argv)
{
const char *path = argv[1];
notmuch_database_t *rw_db, *ro_db;
notmuch_messages_t *messages;
notmuch_message_t *message, *ro_message;
notmuch_query_t *query;
notmuch_tags_t *tags;
EXPECT0 (notmuch_database_open (path, NOTMUCH_DATABASE_MODE_READ_ONLY, &ro_db));
assert(ro_db);
EXPECT0 (notmuch_database_find_message (ro_db, "${first_id}", &ro_message));
assert(ro_message);
EXPECT0 (notmuch_database_open (path, NOTMUCH_DATABASE_MODE_READ_WRITE, &rw_db));
query = notmuch_query_create(rw_db, "");
EXPECT0 (notmuch_query_search_messages_st (query, &messages));
for (int count=0;
notmuch_messages_valid (messages);
notmuch_messages_move_to_next (messages), count++) {
message = notmuch_messages_get (messages);
for (int i=0; i<200; i++) {
char *tag_str = talloc_asprintf(rw_db, "%d", i);
EXPECT0 (notmuch_message_add_tag (message, tag_str));
talloc_free (tag_str);
}
}
notmuch_database_close (rw_db);
tags = notmuch_message_get_tags (ro_message);
if (tags)
printf("SUCCESS\n");
return 0;
}
EOF
cat <<'EOF' >EXPECTED
== stdout ==
SUCCESS
== stderr ==
EOF
test_expect_equal_file EXPECTED OUTPUT
test_done