ref: 9f76a7f6819ac04552b4fb6588156f3e4089d1d7
dir: /appl/lib/db.b/
implement DB;
include "sys.m";
sys: Sys;
include "dial.m";
include "keyring.m";
include "security.m";
include "db.m";
RES_HEADER_SIZE: con 22;
open(addr, username, password, dbname: string): (ref DB_Handle, list of string)
{
(fd, err) := connect(addr, "none");
if(nil == fd)
return (nil, err :: nil);
return dbopen(fd, username, password, dbname);
}
connect(addr: string, alg: string): (ref Sys->FD, string)
{
if (sys == nil)
sys = load Sys Sys->PATH;
dial := load Dial Dial->PATH;
if(dial == nil)
return (nil, sys->sprint("load %s: %r", Dial->PATH));
addr = dial->netmkaddr(addr, "net", "6669"); # infdb
conn := dial->dial(addr, nil);
if(conn == nil)
return (nil, sys->sprint("can't dial %s: %r", addr));
(n, addrparts) := sys->tokenize(addr, "!");
if(n >= 2)
addr = hd addrparts + "!" + hd tl addrparts; # ignore service for key search
kr := load Keyring Keyring->PATH;
user := user();
kd := "/usr/" + user + "/keyring/";
cert := kd + addr;
if(sys->stat(cert).t0 < 0)
cert = kd + "default";
ai := kr->readauthinfo(cert);
#
# let auth->client handle nil ai
# if(ai == nil){
# return (nil, sys->sprint("DB init: certificate for %s not found, use getauthinfo first", addr));
# }
#
au := load Auth Auth->PATH;
if(au == nil)
return (nil, sys->sprint("DB init: can't load module Auth %r"));
err := au->init();
if(err != nil)
return (nil, sys->sprint("DB init: can't initialize module Auth: %s", err));
fd: ref Sys->FD;
(fd, err) = au->client(alg, ai, conn.dfd);
if(fd == nil)
return (nil, sys->sprint("DB init: authentication failed: %s", err));
return (fd, nil);
}
dbopen(fd: ref Sys->FD, username, password, dbname: string): (ref DB_Handle, list of string)
{
dbh := ref DB_Handle;
dbh.datafd = fd;
dbh.lock = makelock();
dbh.sqlstream = -1;
logon := array of byte (username +"/"+ password +"/"+ dbname);
(mtype, strm, rc, data) := sendReq(dbh, 'I', logon);
if(mtype == 'h')
return (nil, (sys->sprint("DB: couldn't initialize %s for %s", dbname, username) :: string data :: nil));
dbh.sqlconn = int string data;
(mtype, strm, rc, data) = sendReq(dbh, 'O', array of byte string dbh.sqlconn);
if(mtype == 'h')
return (nil, (sys->sprint("DB: couldn't open SQL connection") :: string data :: nil));
dbh.sqlstream = int string data;
return (dbh, nil);
}
DB_Handle.SQLOpen(oldh: self ref DB_Handle): (int, ref DB_Handle)
{
dbh := ref *oldh;
(mtype, nil, nil, data) := sendReq(dbh, 'O', array of byte string dbh.sqlconn);
if(mtype == 'h')
return (-1, nil);
dbh.sqlstream = int string data;
return (0, dbh);
}
DB_Handle.SQLClose(dbh: self ref DB_Handle): int
{
(mtype, nil, nil, nil) := sendReq(dbh, 'K', array[0] of byte);
if(mtype == 'h')
return -1;
dbh.sqlstream = -1;
return 0;
}
DB_Handle.SQL(dbh: self ref DB_Handle, command: string): (int, list of string)
{
(mtype, nil, nil, data) := sendReq(dbh, 'W', array of byte command);
if(mtype == 'h')
return (-1, "Probable SQL format error" :: string data :: nil);
return (0, nil);
}
DB_Handle.columns(dbh: self ref DB_Handle): int
{
(mtype, nil, nil, data) := sendReq(dbh, 'C', array[0] of byte);
if(mtype == 'h')
return 0;
return int string data;
}
DB_Handle.nextRow(dbh: self ref DB_Handle): int
{
(mtype, nil, nil, data) := sendReq(dbh, 'N', array[0] of byte);
if(mtype == 'h')
return 0;
return int string data;
}
DB_Handle.read(dbh: self ref DB_Handle, columnI: int): (int, array of byte)
{
(mtype, nil, nil, data) := sendReq(dbh, 'R', array of byte string columnI);
if(mtype == 'h')
return (-1, data);
return (len data, data);
}
DB_Handle.write(dbh: self ref DB_Handle, paramI: int, val: array of byte)
: int
{
outbuf := array[len val + 4] of byte;
param := array of byte sys->sprint("%3d ", paramI);
for(i := 0; i < 4; i++)
outbuf[i] = param[i];
outbuf[4:] = val;
(mtype, nil, nil, nil) := sendReq(dbh, 'P', outbuf);
if(mtype == 'h')
return -1;
return len val;
}
DB_Handle.columnTitle(handle: self ref DB_Handle, columnI: int): string
{
(mtype, nil, nil, data) := sendReq(handle, 'T', array of byte string columnI);
if(mtype == 'h')
return nil;
return string data;
}
DB_Handle.errmsg(dbh: self ref DB_Handle): string
{
(nil, nil, nil, data) := sendReq(dbh, 'H', array[0] of byte);
return string data;
}
sendReq(dbh: ref DB_Handle, mtype: int, data: array of byte) : (int, int, int, array of byte)
{
lock(dbh);
header := sys->sprint("%c1%11d %3d ", mtype, len data, dbh.sqlstream);
if(sys->write(dbh.datafd, array of byte header, 18) != 18) {
unlock(dbh);
return ('h', dbh.sqlstream, 0, array of byte "header write failure");
}
if(sys->write(dbh.datafd, data, len data) != len data) {
unlock(dbh);
return ('h', dbh.sqlstream, 0, array of byte "data write failure");
}
if(sys->write(dbh.datafd, array of byte "\n", 1) != 1) {
unlock(dbh);
return ('h', dbh.sqlstream, 0, array of byte "header write failure");
}
hbuf := array[RES_HEADER_SIZE+3] of byte;
if((n := sys->readn(dbh.datafd, hbuf, RES_HEADER_SIZE)) != RES_HEADER_SIZE) {
unlock(dbh);
if(n < 0)
why := sys->aprint("read error: %r");
else if(n == 0)
why = sys->aprint("lost connection");
else
why = sys->aprint("read error: short read");
return ('h', dbh.sqlstream, 0, why);
}
rheader := string hbuf[0:22];
rtype := rheader[0];
# Probably should check version in header[1]
datalen := int rheader[2:13];
rstrm := int rheader[14:17];
retcode := int rheader[18:21];
databuf := array[datalen] of byte;
# read in loop until get amount of data we want. If there is a mismatch
# here, we may hang with a lock on!
nbytes: int;
for(length := 0; length < datalen; length += nbytes) {
nbytes = sys->read(dbh.datafd, databuf[length:], datalen-length);
if(nbytes <= 0) {
break;
}
}
nbytes = sys->read(dbh.datafd, hbuf, 1); # The final \n
unlock(dbh);
return (rtype, rstrm, retcode, databuf);
}
makelock(): chan of int
{
return chan[1] of int;
}
lock(h: ref DB_Handle)
{
h.lock <-= h.sqlstream;
}
unlock(h: ref DB_Handle)
{
<-h.lock;
}
user(): string
{
sys = load Sys Sys->PATH;
fd := sys->open("/dev/user", sys->OREAD);
if(fd == nil)
return "";
buf := array[Sys->NAMEMAX] of byte;
n := sys->read(fd, buf, len buf);
if(n < 0)
return "";
return string buf[0:n];
}