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#include <cstring>
#include <iostream>
#include <fstream>
#include <sstream>
#include <limits>
#include <cstdio>
#include <iomanip>
#include <unordered_map>
#include <unordered_set>
#include <vector>
#include <fcntl.h>
#include <signal.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <openssl/rand.h>
#include "misc.h"
#include "muchsync.h"
#include "infinibuf.h"
using namespace std;
bool interrupted;
class msg_sync {
sqlite3 *db_;
notmuch_db &nm_;
sqlstmt_t update_hash_stamp_;
sqlstmt_t add_file_;
sqlstmt_t del_file_;
sqlstmt_t set_link_count_;
sqlstmt_t delete_link_count_;
sqlstmt_t clear_tags_;
sqlstmt_t add_tag_;
sqlstmt_t update_message_id_stamp_;
sqlstmt_t record_docid_;
std::unordered_map<string,i64> dir_ids_;
std::pair<i64,i64> mystamp_;
i64 get_dir_docid (const string &dir);
public:
hash_lookup hashdb;
tag_lookup tagdb;
msg_sync(notmuch_db &nm, sqlite3 *db);
bool hash_sync(const versvector &remote_sync_vector,
const hash_info &remote_hash_info,
const string *sourcefile, const tag_info *tip);
bool tag_sync(const versvector &remote_sync_vector,
const tag_info &remote_tag_info);
void commit();
};
static void
interrupt(int sig)
{
interrupted = true;
}
static void
catch_interrupts(int sig, bool active)
{
struct sigaction act;
memset(&act, 0, sizeof(act));
if (active) {
act.sa_handler = &interrupt;
act.sa_flags = SA_RESETHAND;
}
else {
if (interrupted)
exit(1);
act.sa_handler = SIG_DFL;
}
sigaction(sig, &act, nullptr);
}
static string
myhostname()
{
char buf[257];
buf[sizeof(buf) - 1] = '\0';
if (gethostname (buf, sizeof(buf) - 1))
throw runtime_error (string("gethsotname: ") + strerror (errno));
return buf;
}
inline uint32_t
randint()
{
uint32_t v;
if (RAND_bytes ((unsigned char *) &v, sizeof (v)) == -1)
throw runtime_error ("RAND_bytes failed");
return v;
}
static string
maildir_name()
{
static string hostname = myhostname();
static int pid = getpid();
static int ndeliveries = 0;
ostringstream os;
using namespace std::chrono;
auto now = system_clock::now().time_since_epoch();
os << duration_cast<seconds>(now).count()
<< ".M" << duration_cast<nanoseconds>(now % seconds(1)).count()
<< 'P' << pid
<< 'Q' << ++ndeliveries
<< 'R' << setfill('0') << hex << setw(2 * sizeof(randint())) << randint()
<< '.' << hostname;
return os.str();
}
static string
new_maildir_path(const string &dir, string *namep = nullptr)
{
string name = maildir_name();
if ((dir.size() > 4 && !strncmp(dir.data() + (dir.size() - 4), "/cur", 4))
|| (dir.size() == 3 && dir == "cur"))
name += ":2,";
if (namep)
*namep = name;
if (dir.size() && dir.back() != '/')
return dir + "/" + name;
else
return dir + name;
}
static writestamp
get_mystamp(sqlite3 *db)
{
sqlstmt_t s (db, "SELECT replica, version "
"FROM configuration JOIN sync_vector ON (value = replica) "
"WHERE key = 'self';");
if (!s.step().row())
throw runtime_error ("Cannot find myself in sync_vector");
return { s.integer(0), s.integer(1) };
}
msg_sync::msg_sync (notmuch_db &nm, sqlite3 *db)
: db_(db), nm_ (nm),
update_hash_stamp_(db_, "UPDATE maildir_hashes "
"SET replica = ?, version = ? WHERE hash_id = ?;"),
add_file_(db_, "INSERT INTO xapian_files"
" (dir_docid, name, docid, mtime, inode, hash_id)"
" VALUES (?, ?, ?, ?, ?, ?);"),
del_file_(db, "DELETE FROM xapian_files"
" WHERE (dir_docid = ?) & (name = ?);"),
set_link_count_(db_, "INSERT OR REPLACE INTO xapian_nlinks"
" (hash_id, dir_docid, link_count) VALUES (?, ?, ?);"),
delete_link_count_(db_, "DELETE FROM xapian_nlinks"
" WHERE (hash_id = ?) & (dir_docid = ?);"),
clear_tags_(db_, "DELETE FROM tags WHERE docid = ?;"),
add_tag_(db_, "INSERT OR IGNORE INTO tags (docid, tag) VALUES (?, ?);"),
update_message_id_stamp_(db_, "UPDATE message_ids SET"
" replica = ?, version = ? WHERE docid = ?;"),
record_docid_(db_, "INSERT OR IGNORE INTO message_ids"
" (message_id, docid, replica, version)"
" VALUES (?, ?, 0, 0);"),
mystamp_(get_mystamp(db_)),
hashdb (nm_.maildir, db_),
tagdb (db_)
{
sqlstmt_t s (db_, "SELECT dir_path, dir_docid FROM xapian_dirs;");
while (s.step().row()) {
string dir {s.str(0)};
i64 dir_id {s.integer(1)};
dir_ids_.emplace (dir, dir_id);
}
}
static bool
sanity_check_path (const string &path)
{
if (path == "..")
return false;
if (path.size() < 3)
return true;
return (path.substr(0, 3) != "../"
&& path.substr(path.size()-3) != "/.."
&& path.find("/../") == string::npos);
}
inline bool
is_dir (const string &path)
{
struct stat sb;
return !stat (path.c_str(), &sb) && (errno = ENOTDIR, S_ISDIR (sb.st_mode));
}
static bool
recursive_mkdir(string path)
{
string::size_type n = 0;
for (;;) {
n = path.find_first_not_of ('/', n);
if (n == string::npos)
return true;
n = path.find_first_of ('/', n);
if (n != string::npos)
path[n] = '\0';
if (!is_dir (path)) {
if (mkdir (path.c_str(), 0777)) {
cerr << "creating directory " << path
<< " failed (" << strerror(errno) << ")\n";
return false;
}
if (opt_verbose > 0)
cerr << "created directory " << path.c_str() << '\n';
}
if (n == string::npos)
return true;
path[n] = '/';
}
}
static bool
maildir_mkdir(string path)
{
if (!recursive_mkdir(path))
return false;
size_t pos = path.rfind('/');
if (pos == string::npos)
pos = 0;
else
pos++;
string prefix = path.substr(0, pos);
string suffix = path.substr(pos);
if (suffix == "new") {
if (!mkdir((prefix + "cur").c_str(), 0777) && opt_verbose > 0)
cerr << "created directory " << prefix << "cur\n";
if (!mkdir((prefix + "tmp").c_str(), 0777) && opt_verbose > 0)
cerr << "created directory " << prefix << "tmp\n";
}
else if (suffix == "cur") {
if (!mkdir((prefix + "new").c_str(), 0777) && opt_verbose > 0)
cerr << "created directory " << prefix << "new\n";
if (!mkdir((prefix + "tmp").c_str(), 0777) && opt_verbose > 0)
cerr << "created directory " << prefix << "tmp\n";
}
return true;
}
inline Xapian::docid
notmuch_directory_get_document_id (const notmuch_directory_t *dir)
{
struct fake_directory {
notmuch_database_t *notmuch;
Xapian::docid doc_id;
};
return reinterpret_cast<const fake_directory *>(dir)->doc_id;
}
i64
msg_sync::get_dir_docid(const string &dir)
{
auto i = dir_ids_.find(dir);
if (i != dir_ids_.end())
return i->second;
i64 dir_docid = nm_.get_dir_docid(dir.c_str());
sqlexec (db_, "INSERT OR REPLACE INTO xapian_dirs"
" (dir_path, dir_docid, dir_mtime) VALUES (%Q, %lld, -1);",
dir.c_str(), i64(dir_docid));
dir_ids_.emplace(dir, dir_docid);
return dir_docid;
}
static void
resolve_one_link_conflict(const unordered_map<string,i64> &a,
const unordered_map<string,i64> &b,
const string &name,
unordered_map<string,i64> &out)
{
if (out.find(name) != out.end())
return;
size_t pos = name.rfind('/');
if (pos == string::npos)
pos = 0;
else
pos++;
string suffix = name.substr(pos);
if (suffix != "cur" && suffix != "new") {
out[name] = max(find_default(0, a, name), find_default(0, b, name));
return;
}
string base = name.substr(0, pos);
string newpath = base + "new", curpath = base + "cur";
i64 curval = max(find_default(0, a, curpath), find_default(0, b, curpath));
i64 newval = (max(find_default(0, a, curpath) + find_default(0, a, newpath),
find_default(0, b, curpath) + find_default(0, b, newpath))
- curval);
if (curval)
out[curpath] = curval;
if (newval)
out[newpath] = newval;
}
static unordered_map<string,i64>
resolve_link_conflicts(const unordered_map<string,i64> &a,
const unordered_map<string,i64> &b)
{
unordered_map<string,i64> ret;
for (auto ia : a)
resolve_one_link_conflict(a, b, ia.first, ret);
for (auto ib : b)
resolve_one_link_conflict(a, b, ib.first, ret);
return ret;
}
bool
msg_sync::hash_sync(const versvector &rvv,
const hash_info &rhi,
const string *sourcep,
const tag_info *tip)
{
hash_info lhi;
i64 docid = -1;
if (hashdb.lookup(rhi.hash)) {
/* We might already be up to date from a previous sync that never
* completed, in which case there is nothing to do. */
if (hashdb.info().hash_stamp == rhi.hash_stamp)
return true;
lhi = hashdb.info();
}
else
lhi.hash = rhi.hash;
bool links_conflict =
lhi.hash_stamp.second > find_default (0, rvv, lhi.hash_stamp.first);
bool deleting = rhi.dirs.empty() && (!links_conflict || lhi.dirs.empty());
unordered_map<string,i64> needlinks
(links_conflict ? resolve_link_conflicts (lhi.dirs, rhi.dirs) : rhi.dirs);
bool needsource = false;
for (auto i : lhi.dirs)
needlinks[i.first] -= i.second;
for (auto i : needlinks)
if (i.second > 0) {
needsource = true;
break;
}
/* find copy of content, if needed */
string source;
bool clean_trash = false;
struct stat sb;
if (needsource) {
if (sourcep)
source = *sourcep;
else if (!hashdb.ok() || !hashdb.get_pathname (&source, &clean_trash))
return false;
if (stat(source.c_str(), &sb))
return false;
}
if (!hashdb.ok()) {
hashdb.create(rhi);
lhi = hashdb.info();
}
/* Set writestamp for new link counts */
const writestamp *wsp = links_conflict ? &mystamp_ : &rhi.hash_stamp;
update_hash_stamp_.reset()
.param(wsp->first, wsp->second, hashdb.hash_id()).step();
auto save_needlinks = needlinks;
/* add missing links */
for (auto li : needlinks)
for (; li.second > 0; --li.second) {
if (!sanity_check_path(li.first))
break;
string newname;
string target =
new_maildir_path(hashdb.maildir + "/" + li.first, &newname);
if (link(source.c_str(), target.c_str())
&& (errno != ENOENT
|| !maildir_mkdir(hashdb.maildir + "/" + li.first)
|| link(source.c_str(), target.c_str())))
throw runtime_error (string("link (\"") + source + "\", \""
+ target + "\"): " + strerror(errno));
cleanup end_atomic;
if (tip) {
nm_.begin_atomic();
end_atomic.reset(mem_fn(¬much_db::end_atomic), ref(nm_));
}
bool isnew;
docid =
notmuch_db::get_docid(nm_.add_message(target,
tip ? &tip->tags : nullptr,
&isnew));
i64 dir_id = get_dir_docid(li.first);
add_file_.reset().param(dir_id, newname, docid, ts_to_double(sb.ST_MTIM),
i64(sb.st_ino), hashdb.hash_id()).step();
if (isnew) {
record_docid_.reset().param(rhi.message_id, docid).step();
// tip might be NULL here when undeleting a file
if (tip) {
update_message_id_stamp_.reset()
.param(tip->tag_stamp.first, tip->tag_stamp.second, docid).step();
add_tag_.reset().bind_int(1, docid);
for (auto t : tip->tags)
add_tag_.reset().bind_text(2, t).step();
}
else {
// The empty tag is always invalid, so if worse comes to
// worst and we crash at the wrong time, the next scan will
// end up bumping the version number on this message ID.
add_tag_.reset().param(docid, "").step();
}
}
}
/* remove extra links */
if (!links_conflict)
for (int i = 0, e = hashdb.nlinks(); i < e; i++) {
i64 &n = needlinks[hashdb.links().at(i).first];
if (n < 0) {
string path = hashdb.link_path(i);
bool err;
if (deleting) {
string dest = trashname(hashdb.maildir, rhi.hash);
err = rename (path.c_str(), dest.c_str());
if (err)
cerr << "rename " << path << ' '
<< trashname(hashdb.maildir, rhi.hash)
<< ": " << strerror (errno) << '\n';
/* You can't rename a file onto itself, so if the trash
* already contains a hard link to the same inode, we need
* to delete the original. */
else
unlink (path.c_str());
}
else {
err = unlink (path.c_str());
if (err)
cerr << "unlink " << path << ' '
<< ": " << strerror (errno) << '\n';
}
if (!err) {
++n;
auto df = hashdb.links()[i];
i64 dir_docid = get_dir_docid(df.first);
del_file_.reset().param(dir_docid, df.second).step();
nm_.remove_message(path);
}
}
}
/* Adjust link counts in database */
for (auto li : save_needlinks)
if (li.second != 0) {
i64 dir_docid = get_dir_docid(li.first);
i64 newcount = find_default(0, lhi.dirs, li.first) + li.second;
if (newcount > 0)
set_link_count_.reset()
.param(hashdb.hash_id(), dir_docid, newcount).step();
else
delete_link_count_.reset().param(hashdb.hash_id(), dir_docid).step();
}
if (clean_trash)
unlink (trashname(hashdb.maildir, rhi.hash).c_str());
return true;
}
bool
msg_sync::tag_sync(const versvector &rvv, const tag_info &rti)
{
if (!tagdb.lookup(rti.message_id)) {
cerr << "warning: can't find " << rti.message_id << '\n';
return false;
}
const tag_info <i = tagdb.info();
if (lti.tag_stamp == rti.tag_stamp)
return true;
sqlexec (db_, "SAVEPOINT tag_sync;");
cleanup c (sqlexec, db_, "ROLLBACK TO tag_sync;");
notmuch_db::message_t msg = nm_.get_message (rti.message_id.c_str());
if (tagdb.docid() != nm_.get_docid(msg)) {
cerr << "error: muchsync docid " << tagdb.docid()
<< " != xapian docid " << nm_.get_docid(msg)
<< " for message " << rti.message_id << '\n';
terminate();
}
bool tags_conflict
= lti.tag_stamp.second > find_default (0, rvv, lti.tag_stamp.first);
unordered_set<string> newtags (rti.tags);
if (tags_conflict) {
// Logically OR most tags
for (auto i : lti.tags)
newtags.insert(i);
// But logically AND and_tags
for (auto i : nm_.and_tags)
if (rti.tags.find(i) == rti.tags.end()
|| lti.tags.find(i) == lti.tags.end())
newtags.erase(i);
}
nm_.set_tags(msg, newtags);
const writestamp *wsp = tags_conflict ? &mystamp_ : &rti.tag_stamp;
update_message_id_stamp_.reset()
.param(wsp->first, wsp->second, tagdb.docid())
.step();
clear_tags_.reset().param(tagdb.docid()).step();
add_tag_.reset().bind_int(1, tagdb.docid());
for (auto t : newtags)
add_tag_.reset().bind_text(2, t).step();
c.release();
sqlexec (db_, "RELEASE tag_sync;");
return true;
}
static string
receive_message (istream &in, const hash_info &hi, const string &maildir)
{
string path (maildir + muchsync_tmpdir + "/" + maildir_name());
ofstream tmp (path, ios_base::out|ios_base::trunc);
if (!tmp.is_open())
throw runtime_error (path + ": " + strerror(errno));
cleanup _unlink (unlink, path.c_str());
i64 size = hi.size;
hash_ctx ctx;
while (size > 0) {
char buf[16384];
int n = min<i64>(sizeof(buf), size);
in.read(buf, n);
if (!in.good())
throw runtime_error ("premature EOF receiving message");
ctx.update(buf, n);
tmp.write(buf, n);
if (!tmp.good())
throw runtime_error (string("error writing mail file: ")
+ strerror(errno));
size -= n;
}
tmp.close();
if (ctx.final() != hi.hash)
throw runtime_error ("message received does not match hash");
_unlink.release();
return path;
}
static void
set_peer_vector (sqlite3 *sqldb, const versvector &vv)
{
sqlexec (sqldb, R"(
CREATE TEMP TABLE IF NOT EXISTS peer_vector (
replica INTEGER PRIMARY KEY,
known_version INTEGER);
DELETE FROM peer_vector;
INSERT OR REPLACE INTO peer_vector
SELECT DISTINCT replica, 0 FROM message_ids;
INSERT OR REPLACE INTO peer_vector
SELECT DISTINCT replica, 0 FROM maildir_hashes;
)");
sqlstmt_t pvadd (sqldb, "INSERT OR REPLACE INTO"
" peer_vector (replica, known_version) VALUES (?, ?);");
for (writestamp ws : vv)
pvadd.param(ws.first, ws.second).step().reset();
}
static void
record_peer_vector(sqlite3 *sqldb)
{
sqlexec(sqldb, R"(
INSERT OR REPLACE INTO sync_vector (replica, version)
SELECT replica, p.known_version
FROM peer_vector p LEFT OUTER JOIN sync_vector s USING (replica)
WHERE ifnull (s.version, 0) < p.known_version)");
}
static i64
send_links (sqlite3 *sqldb, const string &prefix, ostream &out)
{
unordered_map<i64,string> dirs;
{
sqlstmt_t d (sqldb, "SELECT dir_docid, dir_path FROM xapian_dirs;");
while (d.step().row())
dirs.emplace (d.integer(0), d.str(1));
}
sqlstmt_t changed (sqldb, R"(
SELECT h.hash_id, hash, size, message_id, h.replica, h.version,
dir_docid, link_count
FROM (peer_vector p JOIN maildir_hashes h
ON ((p.replica = h.replica) & (p.known_version < h.version)))
LEFT OUTER JOIN xapian_nlinks USING (hash_id);)");
i64 count = 0;
hash_info hi;
changed.step();
while (changed.row()) {
i64 hash_id = changed.integer(0);
hi.hash = changed.str(1);
hi.size = changed.integer(2);
hi.message_id = changed.str(3);
hi.hash_stamp.first = changed.integer(4);
hi.hash_stamp.second = changed.integer(5);
hi.dirs.clear();
if (changed.null(6))
changed.step();
else {
hi.dirs.emplace(dirs[changed.integer(6)], changed.integer(7));
while (changed.step().row() && changed.integer(0) == hash_id)
hi.dirs.emplace(dirs[changed.integer(6)], changed.integer(7));
}
out << prefix << hi << '\n';
if (opt_verbose > 3)
cerr << prefix << hi << '\n';
count++;
}
return count;
}
static i64
send_tags (sqlite3 *sqldb, const string &prefix, ostream &out)
{
sqlstmt_t changed (sqldb, R"(
SELECT m.docid, m.message_id, m.replica, m.version, tags.tag
FROM (peer_vector p JOIN message_ids m
ON ((p.replica = m.replica) & (p.known_version < m.version)))
LEFT OUTER JOIN tags USING (docid);)");
tag_info ti;
changed.step();
i64 count = 0;
while (changed.row()) {
i64 docid = changed.integer(0);
ti.message_id = changed.str(1);
ti.tag_stamp.first = changed.integer(2);
ti.tag_stamp.second = changed.integer(3);
ti.tags.clear();
if (changed.null(4))
changed.step();
else {
ti.tags.insert (changed.str(4));
while (changed.step().row() && changed.integer(0) == docid)
ti.tags.insert (changed.str(4));
}
out << prefix << ti << '\n';
if (opt_verbose > 3)
cerr << prefix << ti << '\n';
count++;
}
return count;
}
static bool
send_content(hash_lookup &hashdb, tag_lookup &tagdb, const string &hash,
const string &prefix, ostream &out)
{
streambuf *sb;
if (hashdb.lookup(hash) && (sb = hashdb.content())
&& tagdb.lookup(hashdb.info().message_id)) {
out << prefix << hashdb.info()
<< ' ' << tagdb.info() << '\n' << sb;
return true;
}
return false;
}
void
muchsync_server(sqlite3 *db, notmuch_db &nm)
{
msg_sync msync(nm, db);
hash_lookup &hashdb = msync.hashdb;
tag_lookup tagdb(db);
bool remotevv_valid = false;
versvector remotevv;
bool transaction = false;
auto xbegin = [&transaction,db]() {
if (!transaction) {
sqlexec(db, "BEGIN IMMEDIATE;");
transaction = true;
}
};
cout << "200 " << dbvers << '\n';
string cmdline;
istringstream cmdstream;
while (getline(cin, cmdline).good()) {
cmdstream.clear();
cmdstream.str(cmdline);
string cmd;
cmdstream >> cmd;
if (cmd.empty()) {
cout << "500 invalid empty line\n";
}
else if (cmd == "quit") {
cout << "200 goodbye\n";
return;
}
else if (cmd == "conffile") {
ifstream is (opt_notmuch_config);
ostringstream os;
if (is.is_open() && (os << is.rdbuf())) {
string conf (os.str());
cout << "221-" << conf.length() << '\n'
<< conf << "221 ok\n";
}
else
cout << "410 cannot find configuration\n";
}
else if (cmd.substr(1) == "info") {
string key;
cmdstream >> key;
switch (cmd[0]) {
case 'l': // linfo command
if (hashdb.lookup(key))
cout << "210 " << hashdb.info() << '\n';
else
cout << "510 unknown hash\n";
break;
case 't': // tinfo command
if (tagdb.lookup(percent_decode(key)))
cout << "210 " << tagdb.info() << '\n';
else
cout << "510 unkown message id\n";
break;
default:
cout << "500 unknown verb " << cmd << '\n';
break;
}
}
else if (cmd == "send") {
string hash;
cmdstream >> hash;
if (send_content(hashdb, tagdb, hash, "220-", cout))
cout << "220 " << hash << '\n';
else if (hashdb.ok())
cout << "420 cannot open file\n";
else
cout << "520 unknown hash\n";
}
else if (cmd == "vect") {
if (!read_sync_vector(cmdstream, remotevv)) {
cout << "500 could not parse vector\n";
remotevv_valid = false;
}
else {
set_peer_vector(db, remotevv);
remotevv_valid = true;
cout << "200 " << show_sync_vector (get_sync_vector (db)) << '\n';
}
}
else if (cmd == "link") {
xbegin();
hash_info hi;
if (!remotevv_valid)
cout << "500 must follow vect command\n";
else if (!(cmdstream >> hi))
cout << "500 could not parse hash_info\n";
else if (msync.hash_sync(remotevv, hi, nullptr, nullptr)) {
if (opt_verbose > 3)
cerr << "received-links " << hi << '\n';
cout << "220 " << hi.hash << " ok\n";
}
else
cout << "520 " << hi.hash << " missing content\n";
}
else if (cmd == "recv") {
xbegin();
hash_info hi;
tag_info ti;
if (!remotevv_valid)
cout << "500 must follow vect command\n";
else if (!(cmdstream >> hi >> ti))
cout << "500 could not parse hash_info or tag_info\n";
else {
string path;
try {
path = receive_message(cin, hi, nm.maildir);
if (!msync.hash_sync(remotevv, hi, &path, &ti))
cout << "550 failed to synchronize message\n";
else {
if (opt_verbose > 3)
cerr << "received-file " << hi << '\n';
cout << "250 ok\n";
}
}
catch (exception e) {
cerr << e.what() << '\n';
cout << "550 " << e.what() << '\n';
}
unlink(path.c_str());
}
}
else if (cmd == "tags") {
xbegin();
tag_info ti;
if (!remotevv_valid)
cout << "500 must follow vect command\n";
else if (!(cmdstream >> ti))
cout << "500 could not parse hash_info\n";
else if (msync.tag_sync(remotevv, ti)) {
if (opt_verbose > 3)
cerr << "received-tags " << ti << '\n';
cout << "220 ok\n";
}
else
cout << "520 unknown message-id\n";
}
else if (cmd.substr(1) == "sync") {
if (!remotevv_valid)
cout << "500 must follow vect command\n";
else
switch (cmd[0]) {
case 'l': // lsync command
send_links (db, "210-", cout);
cout << "210 ok\n";
break;
case 't': // tsync command
send_tags (db, "210-", cout);
cout << "210 ok\n";
break;
default:
cout << "500 unknown verb " << cmd << '\n';
break;
}
}
else if (cmd == "commit") {
if (!remotevv_valid)
cout << "500 must follow vect command\n";
record_peer_vector(db);
if (transaction) {
transaction = false;
sqlexec(db, "COMMIT;");
}
cout << "200 ok\n";
remotevv_valid = false;
}
else if (cmd == "help") {
cout << R"(200-commit
200-conffile
200-help
200-linfo HASH
200-link LINK-INFO
200-lsync
200-quit
200-send HASH
200-recv HASH-INFO LINK-INFO <newline> CONTENTS
200-tags TAG-INFO
200-tinfo MESSAGE-ID
200-tsync
200 vect VERSION-VECTOR
)";
}
else
cout << "500 unknown verb " << cmd << '\n';
}
}
istream &
get_response (istream &in, string &line, bool err_ok)
{
if (!getline (in, line))
throw runtime_error ("premature EOF");
if (opt_verbose > 3)
cerr << line << '\n';
if (line.empty())
throw runtime_error ("unexpected empty line");
if (line.size() < 4)
throw runtime_error ("unexpected short line");
if (line.front() != '2' && (line.front() != '5' || !err_ok))
throw runtime_error ("bad response: " + line);
return in;
}
void
muchsync_client (sqlite3 *db, notmuch_db &nm,
istream &in, ostream &out)
{
constexpr time_t commit_interval = 10;
/* Any work done here gets overlapped with server */
sync_local_data (db, nm.maildir);
versvector localvv {get_sync_vector (db)}, remotevv;
string line;
istringstream is;
msg_sync msync (nm, db);
i64 pending = 0;
int down_links = 0, down_body = 0, down_tags = 0,
up_links = 0, up_body = 0, up_tags = 0;
out << "vect " << show_sync_vector(localvv) << "\nlsync\n" << flush;
sqlexec(db, "BEGIN IMMEDIATE;");
get_response (in, line);
get_response (in, line);
is.str(line.substr(4));
if (!read_sync_vector(is, remotevv))
throw runtime_error ("cannot parse version vector " + line.substr(4));
set_peer_vector(db, remotevv);
print_time ("received server's version vector");
catch_interrupts(SIGINT, true);
catch_interrupts(SIGTERM, true);
time_t last_commit = time(nullptr);
auto maybe_commit = [&last_commit,&nm,db] () {
time_t now = time(nullptr);
if (interrupted) {
cerr << "Interrupted\n";
nm.close();
sqlexec(db, "COMMIT;");
exit(1);
}
else if (now - last_commit >= commit_interval) {
nm.close();
sqlexec(db, "COMMIT; BEGIN;");
last_commit = time(nullptr);
}
};
while (get_response (in, line) && line.at(3) == '-') {
is.str(line.substr(4));
hash_info hi;
if (!(is >> hi))
throw runtime_error ("could not parse hash_info: " + line.substr(4));
bool ok = msync.hash_sync (remotevv, hi, nullptr, nullptr);
if (opt_verbose > 2) {
if (ok)
cerr << hi << '\n';
else
cerr << hi.hash << " UNKNOWN\n";
}
if (!ok) {
out << "send " << hi.hash << '\n';
pending++;
}
else
down_links++;
maybe_commit();
}
out << "tsync\n";
int extra_tags = 0;
for (sqlstmt_t nolinks (db, "SELECT message_id FROM message_ids"
" WHERE replica = 0 AND version = 0;");
nolinks.step().row();) {
extra_tags++;
out << "tinfo " << permissive_percent_encode(nolinks.str(0)) << '\n';
}
print_time ("received hashes of new files");
down_body = pending;
hash_info hi;
tag_info ti;
for (; pending > 0; pending--) {
get_response (in, line);
is.str(line.substr(4));
if (!(is >> hi >> ti))
throw runtime_error ("could not parse hash_info: " + line.substr(4));
string path = receive_message(in, hi, nm.maildir);
cleanup _unlink (unlink, path.c_str());
getline (in, line);
if (line.size() < 4 || line.at(0) != '2' || line.at(3) != ' '
|| line.substr(4) != hi.hash)
throw runtime_error ("lost sync while receiving message: " + line);
if (!msync.hash_sync (remotevv, hi, &path, &ti))
throw runtime_error ("msg_sync::sync failed even with source");
if (opt_verbose > 2)
cerr << hi << '\n';
maybe_commit();
}
print_time ("received content of missing messages");
while (get_response (in, line) && line.at(3) == '-') {
down_tags++;
is.str(line.substr(4));
if (!(is >> ti))
throw runtime_error ("could not parse tag_info: " + line.substr(4));
if (opt_verbose > 2)
cerr << ti << '\n';
msync.tag_sync(remotevv, ti);
maybe_commit();
}
for (; extra_tags > 0; extra_tags--) {
get_response(in, line, true);
if (line[0] == '5')
continue;
is.str(line.substr(4));
if (!(is >> ti))
throw runtime_error ("could not parse tag_info: " + line.substr(4));
down_tags++;
if (opt_verbose > 2)
cerr << ti << '\n';
msync.tag_sync(remotevv, ti);
maybe_commit();
}
print_time ("received tags of new and modified messages");
record_peer_vector(db);
nm.close();
sqlexec (db, "COMMIT;");
print_time("commited changes to local database");
if (opt_verbose || opt_noup || opt_upbg)
cerr << "received " << down_body << " messages, "
<< down_links << " link changes, "
<< down_tags << " tag changes\n";
catch_interrupts(SIGINT, false);
catch_interrupts(SIGTERM, false);
if (opt_noup)
return;
if (opt_upbg)
close(opt_upbg_fd);
pending = 0;
i64 i = send_links(db, "link ", out);
print_time("sent moved messages to server");
while (i-- > 0) {
getline(in, line);
if (line.size() < 4 || (line.at(0) != '2' && line.at(0) != '5'))
throw runtime_error ("lost sync while receiving message: " + line);
if (line.at(0) == '5') {
is.str(line.substr(4));
string hash;
is >> hash;
if (send_content(msync.hashdb, msync.tagdb, hash, "recv ", out)) {
pending++;
up_body++;
}
}
else
up_links++;
}
print_time("sent content of new messages to server");
up_tags = send_tags(db, "tags ", out);
pending += up_tags;
print_time("sent modified tags to server");
out << "commit\n";
if (opt_verbose)
cerr << "sent " << up_body << " messages, "
<< up_links << " link changes, "
<< up_tags << " tag changes\n";
while (pending-- > 0)
get_response(in, line);
get_response(in, line);
print_time("commit succeeded on server");
if (!opt_upbg || opt_verbose) {
int w = 5;
cerr << "SUMMARY:\n"
<< " received " << setw(w) << down_body << " messages, "
<< setw(w) << down_links << " link changes, "
<< setw(w) << down_tags << " tag changes\n";
cerr << " sent " << setw(w) << up_body << " messages, "
<< setw(w) << up_links << " link changes, "
<< setw(w) << up_tags << " tag changes\n";
}
}
|