Remove large parts of fishd interaction, including

env_universal_server
This commit is contained in:
ridiculousfish
2014-06-06 10:34:42 -07:00
parent be3e64e5ea
commit ecf56606dc
5 changed files with 14 additions and 458 deletions

View File

@@ -7,7 +7,6 @@
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <pwd.h>
#include <errno.h>
@@ -40,31 +39,11 @@
#include "env_universal.h"
#include "env.h"
/**
Maximum number of times to try to get a new fishd socket
*/
#define RECONNECT_COUNT 32
connection_t env_universal_server(-1);
/**
Set to true after initialization has been performed
*/
static bool s_env_univeral_inited = false;
/**
The number of attempts to start fishd
*/
static int get_socket_count = 0;
#define DEFAULT_RETRY_COUNT 15
#define DEFAULT_RETRY_DELAY 0.2
static wchar_t * path;
static wchar_t *user;
static void (*start_fishd)();
static void (*external_callback)(fish_message_type_t type, const wchar_t *name, const wchar_t *val);
/**
@@ -74,133 +53,6 @@ static int barrier_reply = 0;
void env_universal_barrier();
static int is_dead()
{
return env_universal_server.fd < 0;
}
static int try_get_socket_once(void)
{
int s;
wchar_t *wdir;
wchar_t *wuname;
char *dir = 0;
wdir = path;
wuname = user;
uid_t seuid;
gid_t segid;
if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
{
wperror(L"socket");
return -1;
}
if (wdir)
dir = wcs2str(wdir);
else
dir = strdup("/tmp");
std::string uname;
if (wuname)
{
uname = wcs2string(wuname);
}
else
{
struct passwd *pw = getpwuid(getuid());
if (pw && pw->pw_name)
{
uname = pw->pw_name;
}
}
std::string name;
name.reserve(strlen(dir) + uname.size() + strlen(SOCK_FILENAME) + 2);
name.append(dir);
name.append("/");
name.append(SOCK_FILENAME);
name.append(uname);
free(dir);
debug(3, L"Connect to socket %s at fd %d", name.c_str(), s);
struct sockaddr_un local = {};
local.sun_family = AF_UNIX;
strncpy(local.sun_path, name.c_str(), (sizeof local.sun_path) - 1);
if (connect(s, (struct sockaddr *)&local, sizeof local) == -1)
{
close(s);
/* If it fails on first try, it's probably no serious error, but fishd hasn't been launched yet.
This happens (at least) on the first concurrent session. */
if (get_socket_count > 1)
wperror(L"connect");
return -1;
}
if ((getpeereid(s, &seuid, &segid) != 0) || seuid != geteuid())
{
debug(1, L"Wrong credentials for socket %s at fd %d", name.c_str(), s);
close(s);
return -1;
}
if ((make_fd_nonblocking(s) != 0) || (fcntl(s, F_SETFD, FD_CLOEXEC) != 0))
{
wperror(L"fcntl");
close(s);
return -1;
}
debug(3, L"Connected to fd %d", s);
return s;
}
/**
Get a socket for reading from the server
*/
static int get_socket(void)
{
get_socket_count++;
int s = try_get_socket_once();
if (s < 0)
{
if (start_fishd)
{
debug(2, L"Could not connect to socket %d, starting fishd", s);
start_fishd();
for (size_t i=0; s < 0 && i < DEFAULT_RETRY_COUNT; i++)
{
if (i > 0)
{
// Wait before next try
usleep((useconds_t)(DEFAULT_RETRY_DELAY * 1E6));
}
s = try_get_socket_once();
}
}
}
if (s < 0)
{
debug(1, L"Could not connect to universal variable server, already tried manual restart (or no command supplied). You will not be able to share variable values between fish sessions. Is fish properly installed?");
return -1;
}
return s;
}
/**
Callback function used whenever a new fishd message is recieved
*/
@@ -217,151 +69,19 @@ static void callback(fish_message_type_t type, const wchar_t *name, const wchar_
}
}
/**
Make sure the connection is healthy. If not, close it, and try to
establish a new connection.
*/
static void check_connection(void)
void env_universal_init(void (*cb)(fish_message_type_t type, const wchar_t *name, const wchar_t *val))
{
if (! s_env_univeral_inited)
return;
if (env_universal_server.killme)
{
debug(3, L"Lost connection to universal variable server.");
if (close(env_universal_server.fd))
{
wperror(L"close");
}
env_universal_server.fd = -1;
env_universal_server.killme=0;
env_universal_server.input.clear();
env_universal_read_all();
}
}
/**
Remove all universal variables.
*/
static void env_universal_remove_all()
{
size_t i;
wcstring_list_t lst;
env_universal_common_get_names(lst, true, true);
for (i=0; i<lst.size(); i++)
{
const wcstring &key = lst.at(i);
env_universal_common_remove(key);
}
}
/**
Try to establish a new connection to fishd. If successfull, end
with call to env_universal_barrier(), to make sure everything is in
sync.
*/
static void reconnect()
{
assert(synchronizes_via_fishd());
if (get_socket_count >= RECONNECT_COUNT)
return;
debug(3, L"Get new fishd connection");
s_env_univeral_inited = false;
env_universal_server.buffer_consumed = 0;
env_universal_server.read_buffer.clear();
env_universal_server.fd = get_socket();
external_callback = cb;
env_universal_common_init(&callback);
s_env_univeral_inited = true;
if (env_universal_server.fd >= 0)
{
env_universal_remove_all();
env_universal_barrier();
}
}
void env_universal_init(wchar_t * p,
wchar_t *u,
void (*sf)(),
void (*cb)(fish_message_type_t type, const wchar_t *name, const wchar_t *val))
{
if (! synchronizes_via_fishd())
{
external_callback = cb;
env_universal_common_init(&callback);
s_env_univeral_inited = true;
}
else
{
path=p;
user=u;
start_fishd=sf;
external_callback = cb;
env_universal_server.fd = get_socket();
env_universal_common_init(&callback);
env_universal_read_all();
s_env_univeral_inited = true;
if (env_universal_server.fd >= 0)
{
env_universal_barrier();
}
}
}
void env_universal_destroy()
{
/*
Go into blocking mode and send all data before exiting
*/
if (env_universal_server.fd >= 0)
{
if (fcntl(env_universal_server.fd, F_SETFL, 0) != 0)
{
wperror(L"fcntl");
}
try_send_all(&env_universal_server);
}
connection_destroy(&env_universal_server);
env_universal_server.fd =-1;
s_env_univeral_inited = false;
}
/**
Read all available messages from the server.
*/
int env_universal_read_all()
{
if (! s_env_univeral_inited)
return 0;
if (env_universal_server.fd == -1)
{
reconnect();
if (env_universal_server.fd == -1)
return 0;
}
if (env_universal_server.fd != -1)
{
read_message(&env_universal_server);
check_connection();
return 1;
}
else
{
debug(2, L"No connection to universal variable server");
return 0;
}
}
env_var_t env_universal_get(const wcstring &name)
{
if (!s_env_univeral_inited)
@@ -382,69 +102,7 @@ void env_universal_barrier()
{
ASSERT_IS_MAIN_THREAD();
UNIVERSAL_LOG("BARRIER");
message_t *msg;
fd_set fds;
if (! synchronizes_via_fishd())
{
env_universal_common_sync();
return;
}
if (!s_env_univeral_inited || is_dead())
return;
barrier_reply = 0;
/*
Create barrier request
*/
msg= create_message(BARRIER, 0, 0);
msg->count=1;
env_universal_server.unsent.push(msg);
/*
Wait until barrier request has been sent
*/
debug(3, L"Create barrier");
while (1)
{
try_send_all(&env_universal_server);
check_connection();
if (env_universal_server.unsent.empty())
break;
if (env_universal_server.fd == -1)
{
reconnect();
debug(2, L"barrier interrupted, exiting");
return;
}
FD_ZERO(&fds);
FD_SET(env_universal_server.fd, &fds);
select(env_universal_server.fd+1, 0, &fds, 0, 0);
}
/*
Wait for barrier reply
*/
debug(3, L"Sent barrier request");
while (!barrier_reply)
{
if (env_universal_server.fd == -1)
{
reconnect();
debug(2, L"barrier interrupted, exiting (2)");
return;
}
FD_ZERO(&fds);
FD_SET(env_universal_server.fd, &fds);
select(env_universal_server.fd+1, &fds, 0, 0, 0);
env_universal_read_all();
}
debug(3, L"End barrier");
env_universal_common_sync();
}
@@ -454,28 +112,9 @@ void env_universal_set(const wcstring &name, const wcstring &value, bool exportv
return;
debug(3, L"env_universal_set( \"%ls\", \"%ls\" )", name.c_str(), value.c_str());
if (! synchronizes_via_fishd() || is_dead())
{
env_universal_common_set(name.c_str(), value.c_str(), exportv);
env_universal_barrier();
}
else
{
message_t *msg = create_message(exportv?SET_EXPORT:SET,
name.c_str(),
value.c_str());
if (!msg)
{
debug(1, L"Could not create universal variable message");
return;
}
msg->count=1;
env_universal_server.unsent.push(msg);
env_universal_barrier();
}
env_universal_common_set(name.c_str(), value.c_str(), exportv);
env_universal_barrier();
}
int env_universal_remove(const wchar_t *name)
@@ -487,24 +126,10 @@ int env_universal_remove(const wchar_t *name)
CHECK(name, 1);
wcstring name_str = name;
const wcstring name_str = name;
// TODO: shouldn't have to call get() here, should just have remove return success
res = env_universal_common_get(name_str).missing();
debug(3,
L"env_universal_remove( \"%ls\" )",
name);
if (! synchronizes_via_fishd() || is_dead())
{
env_universal_common_remove(name_str);
}
else
{
message_t *msg = create_message(ERASE, name, 0);
msg->count=1;
env_universal_server.unsent.push(msg);
env_universal_barrier();
}
env_universal_common_remove(name_str);
return res;
}