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rserve.js
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rserve.js
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(function() {
var Rserve = {};
(function() {
function make_basic(type, proto) {
proto = proto || {
json: function() {
throw "json() unsupported for type " + this.type;
}
};
var wrapped_proto = {
json: function(resolver) {
var result = proto.json.call(this, resolver);
result.r_type = type;
if (!_.isUndefined(this.attributes))
result.r_attributes = _.object(_.map(
this.attributes.value,
function(v) { return [v.name, v.value.json(resolver)]; }));
return result;
}
};
return function(v, attrs) {
function r_object() {
this.type = type;
this.value = v;
this.attributes = attrs;
}
r_object.prototype = wrapped_proto;
var result = new r_object();
return result;
};
}
Rserve.Robj = {
"null": function(attributes) {
return {
type: "null",
value: null,
attributes: attributes,
json: function() { return null; }
};
},
clos: function(formals, body, attributes) {
return {
type: "clos",
value: { formals: formals,
body: body },
attributes: attributes,
json: function() { throw "json() unsupported for type clos"; }
};
},
vector: make_basic("vector", {
json: function(resolver) {
var values = _.map(this.value, function (x) { return x.json(resolver); });
if (_.isUndefined(this.attributes)) {
return values;
} else {
if(this.attributes.value[0].name!="names")
throw "expected names here";
var keys = this.attributes.value[0].value.value;
var result = {};
_.each(keys, function(key, i) {
result[key] = values[i];
});
return result;
}
}
}),
symbol: make_basic("symbol", {
json: function() {
return this.value;
}
}),
list: make_basic("list"),
lang: make_basic("lang", {
json: function(resolver) {
var values = _.map(this.value, function (x) { return x.json(resolver); });
if (_.isUndefined(this.attributes)) {
return values;
} else {
if(this.attributes.value[0].name!="names")
throw "expected names here";
var keys = this.attributes.value[0].value.value;
var result = {};
_.each(keys, function(key, i) {
result[key] = values[i];
});
return result;
}
}
}),
tagged_list: make_basic("tagged_list", {
json: function(resolver) {
function classify_list(list) {
if (_.all(list, function(elt) { return elt.name === null; })) {
return "plain_list";
} else if (_.all(list, function(elt) { return elt.name !== null; })) {
return "plain_object";
} else
return "mixed_list";
}
var list = this.value.slice(1);
switch (classify_list(list)) {
case "plain_list":
return _.map(list, function(elt) { return elt.value.json(resolver); });
case "plain_object":
return _.object(_.map(list, function(elt) {
return [elt.name, elt.value.json(resolver)];
}));
case "mixed_list":
return list;
default:
throw "Internal Error";
}
}
}),
tagged_lang: make_basic("tagged_lang", {
json: function(resolver) {
var pair_vec = _.map(this.value, function(elt) { return [elt.name, elt.value.json(resolver)]; });
return pair_vec;
}
}),
vector_exp: make_basic("vector_exp"),
int_array: make_basic("int_array", {
json: function() {
if(this.attributes && this.attributes.type==='tagged_list'
&& this.attributes.value[0].name==='levels'
&& this.attributes.value[0].value.type==='string_array') {
var levels = this.attributes.value[0].value.value;
var arr = _.map(this.value, function(factor) { return levels[factor-1]; });
arr.levels = levels;
return arr;
}
else {
if (this.value.length === 1)
return this.value[0];
else
return this.value;
}
}
}),
double_array: make_basic("double_array", {
json: function() {
if (this.value.length === 1 && _.isUndefined(this.attributes))
return this.value[0];
else
return this.value;
}
}),
string_array: make_basic("string_array", {
json: function(resolver) {
if (this.value.length === 1) {
if (_.isUndefined(this.attributes))
return this.value[0];
if (this.attributes.value[0].name === 'class' &&
this.attributes.value[0].value.value.indexOf("javascript_function") !== -1)
return resolver(this.value[0]);
return this.value;
} else
return this.value;
}
}),
bool_array: make_basic("bool_array", {
json: function() {
if (this.value.length === 1 && _.isUndefined(this.attributes))
return this.value[0];
else
return this.value;
}
}),
raw: make_basic("raw", {
json: function() {
if (this.value.length === 1 && _.isUndefined(this.attributes))
return this.value[0];
else
return this.value;
}
}),
string: make_basic("string", {
json: function() {
return this.value;
}
})
};
})();
// Simple constants and functions are defined here,
// in correspondence with Rserve's Rsrv.h
Rserve.Rsrv = {
PAR_TYPE: function(x) { return x & 255; },
PAR_LEN: function(x) { return x >> 8; },
PAR_LENGTH: function(x) { return x >> 8; },
par_parse: function(x) { return [Rserve.Rsrv.PAR_TYPE(x), Rserve.Rsrv.PAR_LEN(x)]; },
SET_PAR: function(ty, len) { return ((len & 0xffffff) << 8 | (ty & 255)); },
CMD_STAT: function(x) { return (x >> 24) & 127; },
SET_STAT: function(x, s) { return x | ((s & 127) << 24); },
CMD_RESP : 0x10000,
RESP_OK : 0x10000 | 0x0001,
RESP_ERR : 0x10000 | 0x0002,
OOB_SEND : 0x20000 | 0x1000,
OOB_MSG : 0x20000 | 0x2000,
ERR_auth_failed : 0x41,
ERR_conn_broken : 0x42,
ERR_inv_cmd : 0x43,
ERR_inv_par : 0x44,
ERR_Rerror : 0x45,
ERR_IOerror : 0x46,
ERR_notOpen : 0x47,
ERR_accessDenied : 0x48,
ERR_unsupportedCmd : 0x49,
ERR_unknownCmd : 0x4a,
ERR_data_overflow : 0x4b,
ERR_object_too_big : 0x4c,
ERR_out_of_mem : 0x4d,
ERR_ctrl_closed : 0x4e,
ERR_session_busy : 0x50,
ERR_detach_failed : 0x51,
ERR_disabled : 0x61,
ERR_unavailable : 0x62,
ERR_cryptError : 0x63,
ERR_securityClose : 0x64,
CMD_login : 0x001,
CMD_voidEval : 0x002,
CMD_eval : 0x003,
CMD_shutdown : 0x004,
CMD_switch : 0x005,
CMD_keyReq : 0x006,
CMD_secLogin : 0x007,
CMD_OCcall : 0x00f,
CMD_openFile : 0x010,
CMD_createFile : 0x011,
CMD_closeFile : 0x012,
CMD_readFile : 0x013,
CMD_writeFile : 0x014,
CMD_removeFile : 0x015,
CMD_setSEXP : 0x020,
CMD_assignSEXP : 0x021,
CMD_detachSession : 0x030,
CMD_detachedVoidEval : 0x031,
CMD_attachSession : 0x032,
CMD_ctrl : 0x40,
CMD_ctrlEval : 0x42,
CMD_ctrlSource : 0x45,
CMD_ctrlShutdown : 0x44,
CMD_setBufferSize : 0x081,
CMD_setEncoding : 0x082,
CMD_SPECIAL_MASK : 0xf0,
CMD_serEval : 0xf5,
CMD_serAssign : 0xf6,
CMD_serEEval : 0xf7,
DT_INT : 1,
DT_CHAR : 2,
DT_DOUBLE : 3,
DT_STRING : 4,
DT_BYTESTREAM : 5,
DT_SEXP : 10,
DT_ARRAY : 11,
DT_LARGE : 64,
XT_NULL : 0,
XT_INT : 1,
XT_DOUBLE : 2,
XT_STR : 3,
XT_LANG : 4,
XT_SYM : 5,
XT_BOOL : 6,
XT_S4 : 7,
XT_VECTOR : 16,
XT_LIST : 17,
XT_CLOS : 18,
XT_SYMNAME : 19,
XT_LIST_NOTAG : 20,
XT_LIST_TAG : 21,
XT_LANG_NOTAG : 22,
XT_LANG_TAG : 23,
XT_VECTOR_EXP : 26,
XT_VECTOR_STR : 27,
XT_ARRAY_INT : 32,
XT_ARRAY_DOUBLE : 33,
XT_ARRAY_STR : 34,
XT_ARRAY_BOOL_UA : 35,
XT_ARRAY_BOOL : 36,
XT_RAW : 37,
XT_ARRAY_CPLX : 38,
XT_UNKNOWN : 48,
XT_LARGE : 64,
XT_HAS_ATTR : 128,
BOOL_TRUE : 1,
BOOL_FALSE : 0,
BOOL_NA : 2,
GET_XT: function(x) { return x & 63; },
GET_DT: function(x) { return x & 63; },
HAS_ATTR: function(x) { return (x & Rserve.Rsrv.XT_HAS_ATTR) > 0; },
IS_LARGE: function(x) { return (x & Rserve.Rsrv.XT_LARGE) > 0; },
// # FIXME A WHOLE LOT OF MACROS HERE WHICH ARE PROBABLY IMPORTANT
// ##############################################################################
status_codes: {
0x41 : "ERR_auth_failed" ,
0x42 : "ERR_conn_broken" ,
0x43 : "ERR_inv_cmd" ,
0x44 : "ERR_inv_par" ,
0x45 : "ERR_Rerror" ,
0x46 : "ERR_IOerror" ,
0x47 : "ERR_notOpen" ,
0x48 : "ERR_accessDenied" ,
0x49 : "ERR_unsupportedCmd",
0x4a : "ERR_unknownCmd" ,
0x4b : "ERR_data_overflow" ,
0x4c : "ERR_object_too_big",
0x4d : "ERR_out_of_mem" ,
0x4e : "ERR_ctrl_closed" ,
0x50 : "ERR_session_busy" ,
0x51 : "ERR_detach_failed" ,
0x61 : "ERR_disabled" ,
0x62 : "ERR_unavailable" ,
0x63 : "ERR_cryptError" ,
0x64 : "ERR_securityClose"
}
};
(function() {
function read(m)
{
var handlers = {};
function lift(f, amount) {
return function(attributes, length) {
return [f.call(that, attributes, length), amount || length];
};
}
function bind(m, f) {
return function(attributes, length) {
var t = m.call(that, attributes, length);
var t2 = f(t[0])(attributes, length - t[1]);
return [t2[0], t[1] + t2[1]];
};
}
function unfold(f) {
return function(attributes, length) {
var result = [];
var old_length = length;
while (length > 0) {
var t = f.call(that, attributes, length);
result.push(t[0]);
length -= t[1];
}
return [result, old_length];
};
}
var that = {
offset: 0,
data_view: m.make(Rserve.EndianAwareDataView),
msg: m,
//////////////////////////////////////////////////////////////////////
read_int: function() {
var old_offset = this.offset;
this.offset += 4;
return this.data_view.getInt32(old_offset);
},
read_string: function(length) {
// FIXME SLOW
var result = "";
while (length--) {
var c = this.data_view.getInt8(this.offset++);
if (c) result = result + String.fromCharCode(c);
}
return result;
},
read_stream: function(length) {
var old_offset = this.offset;
this.offset += length;
return this.msg.view(old_offset, length);
},
read_int_vector: function(length) {
var old_offset = this.offset;
this.offset += length;
return this.msg.make(Int32Array, old_offset, length);
},
read_double_vector: function(length) {
var old_offset = this.offset;
this.offset += length;
return this.msg.make(Float64Array, old_offset, length);
},
//////////////////////////////////////////////////////////////////////
// these are members of the reader monad
read_null: lift(function(a, l) { return Rserve.Robj.null(a); }),
read_unknown: lift(function(a, l) {
this.offset += l;
return Rserve.Robj.null(a);
}),
read_string_array: function(attributes, length) {
var a = this.read_stream(length).make(Uint8Array);
var result = [];
var current_str = "";
for (var i=0; i<a.length; ++i)
if (a[i] === 0) {
result.push(current_str);
current_str = "";
} else {
current_str = current_str + String.fromCharCode(a[i]);
}
return [Rserve.Robj.string_array(result, attributes), length];
},
read_bool_array: function(attributes, length) {
var l2 = this.read_int();
var s = this.read_stream(length-4);
var a = _.map(s.make(Uint8Array).subarray(0, l2), function(v) {
return v ? true : false;
});
return [Rserve.Robj.bool_array(a, attributes), length];
},
read_raw: function(attributes, length) {
var l2 = this.read_int();
var s = this.read_stream(length-4);
var a = s.make(Uint8Array).subarray(0, l2).buffer;
return [Rserve.Robj.raw(a, attributes), length];
},
read_sexp: function() {
var d = this.read_int();
var _ = Rserve.Rsrv.par_parse(d);
var t = _[0], l = _[1];
var total_read = 4;
var attributes = undefined;
if (Rserve.Rsrv.IS_LARGE(t)) {
var extra_length = this.read_int();
total_read += 4;
l += extra_length * Math.pow(2, 24);
t &= ~64;
}
if (t & Rserve.Rsrv.XT_HAS_ATTR) {
t = t & ~Rserve.Rsrv.XT_HAS_ATTR;
var attr_result = this.read_sexp();
attributes = attr_result[0];
total_read += attr_result[1];
l -= attr_result[1];
}
if (handlers[t] === undefined) {
throw new Rserve.RserveError("Unimplemented " + t, -1);
} else {
var result = handlers[t].call(this, attributes, l);
return [result[0], total_read + result[1]];
}
}
};
that.read_clos = bind(that.read_sexp, function(formals) {
return bind(that.read_sexp, function(body) {
return lift(function(a, l) {
return Rserve.Robj.clos(formals, body, a);
}, 0);
} );
});
that.read_list = unfold(that.read_sexp);
function read_symbol_value_pairs(lst) {
var result = [];
for (var i=0; i<lst.length; i+=2) {
var value = lst[i], tag = lst[i+1];
if (tag.type === "symbol") {
result.push({ name: tag.value,
value: value });
} else {
result.push({ name: null,
value: value });
}
}
return result;
}
that.read_list_tag = bind(that.read_list, function(lst) {
return lift(function(attributes, length) {
var result = read_symbol_value_pairs(lst);
return Rserve.Robj.tagged_list(result, attributes);
}, 0);
});
that.read_lang_tag = bind(that.read_list, function(lst) {
return lift(function(attributes, length) {
var result = read_symbol_value_pairs(lst);
return Rserve.Robj.tagged_lang(result, attributes);
}, 0);
});
function xf(f, g) { return bind(f, function(t) {
return lift(function(a, l) { return g(t, a); }, 0);
}); }
that.read_vector = xf(that.read_list, Rserve.Robj.vector);
that.read_list_no_tag = xf(that.read_list, Rserve.Robj.list);
that.read_lang_no_tag = xf(that.read_list, Rserve.Robj.lang);
that.read_vector_exp = xf(that.read_list, Rserve.Robj.vector_exp);
function sl(f, g) { return lift(function(a, l) {
return g(f.call(that, l), a);
}); }
that.read_symname = sl(that.read_string, Rserve.Robj.symbol);
that.read_int_array = sl(that.read_int_vector, Rserve.Robj.int_array);
that.read_double_array = sl(that.read_double_vector, Rserve.Robj.double_array);
handlers[Rserve.Rsrv.XT_NULL] = that.read_null;
handlers[Rserve.Rsrv.XT_UNKNOWN] = that.read_unknown;
handlers[Rserve.Rsrv.XT_VECTOR] = that.read_vector;
handlers[Rserve.Rsrv.XT_CLOS] = that.read_clos;
handlers[Rserve.Rsrv.XT_SYMNAME] = that.read_symname;
handlers[Rserve.Rsrv.XT_LIST_NOTAG] = that.read_list_no_tag;
handlers[Rserve.Rsrv.XT_LIST_TAG] = that.read_list_tag;
handlers[Rserve.Rsrv.XT_LANG_NOTAG] = that.read_lang_no_tag;
handlers[Rserve.Rsrv.XT_LANG_TAG] = that.read_lang_tag;
handlers[Rserve.Rsrv.XT_VECTOR_EXP] = that.read_vector_exp;
handlers[Rserve.Rsrv.XT_ARRAY_INT] = that.read_int_array;
handlers[Rserve.Rsrv.XT_ARRAY_DOUBLE] = that.read_double_array;
handlers[Rserve.Rsrv.XT_ARRAY_STR] = that.read_string_array;
handlers[Rserve.Rsrv.XT_ARRAY_BOOL] = that.read_bool_array;
handlers[Rserve.Rsrv.XT_RAW] = that.read_raw;
handlers[Rserve.Rsrv.XT_STR] = sl(that.read_string, Rserve.Robj.string);
return that;
}
function parse(msg)
{
var result = {};
var header = new Int32Array(msg, 0, 4);
var resp = header[0] & 16777215, status_code = header[0] >> 24;
result.header = [resp, status_code];
if (result.header[0] === Rserve.Rsrv.RESP_ERR) {
result.ok = false;
result.status_code = status_code;
result.message = "ERROR FROM R SERVER: " + (Rserve.Rsrv.status_codes[status_code] ||
status_code)
+ " " + result.header[0] + " " + result.header[1]
+ " " + msg.byteLength
+ " " + msg;
return result;
}
if (!_.contains([Rserve.Rsrv.RESP_OK, Rserve.Rsrv.OOB_SEND, Rserve.Rsrv.OOB_MSG], result.header[0])) {
result.ok = false;
result.message = "Unexpected response from RServe: " + result.header[0] + " status: " + Rserve.Rsrv.status_codes[status_code];
return result;
}
try {
result.payload = parse_payload(msg);
result.ok = true;
} catch (e) {
result.ok = false;
result.message = e.message;
}
return result;
}
function parse_payload(msg)
{
var payload = Rserve.my_ArrayBufferView(msg, 16, msg.byteLength - 16);
if (payload.length === 0)
return null;
var reader = read(payload);
var d = reader.read_int();
var _ = Rserve.Rsrv.par_parse(d);
var t = _[0], l = _[1];
if (Rserve.Rsrv.IS_LARGE(t)) {
var more_length = reader.read_int();
l += more_length * Math.pow(2, 24);
if (l > (Math.pow(2, 32))) { // resist the 1 << 32 temptation here!
// total_length is greater than 2^32.. bail out because of node limits
// even though in theory we could go higher than that.
throw new Error("Payload too large: " + l + " bytes");
}
t &= ~64;
}
if (t === Rserve.Rsrv.DT_INT) {
return { type: "int", value: reader.read_int() };
} else if (t === Rserve.Rsrv.DT_STRING) {
return { type: "string", value: reader.read_string(l) };
} else if (t === Rserve.Rsrv.DT_BYTESTREAM) { // NB this returns a my_ArrayBufferView()
return { type: "stream", value: reader.read_stream(l) };
} else if (t === Rserve.Rsrv.DT_SEXP) {
_ = reader.read_sexp();
var sexp = _[0], l2 = _[1];
return { type: "sexp", value: sexp };
} else
throw new Rserve.RserveError("Bad type for parse? " + t + " " + l, -1);
}
Rserve.parse_websocket_frame = parse;
Rserve.parse_payload = parse_payload;
})();
// we want an endian aware dataview mostly because ARM can be big-endian, and
// that might put us in trouble wrt handheld devices.
//////////////////////////////////////////////////////////////////////////////
(function() {
var _is_little_endian;
(function() {
var x = new ArrayBuffer(4);
var bytes = new Uint8Array(x),
words = new Uint32Array(x);
bytes[0] = 1;
if (words[0] === 1) {
_is_little_endian = true;
} else if (words[0] === 16777216) {
_is_little_endian = false;
} else {
throw "we're bizarro endian, refusing to continue";
}
})();
Rserve.EndianAwareDataView = (function() {
var proto = {
'setInt8': function(i, v) { return this.view.setInt8(i, v); },
'setUint8': function(i, v) { return this.view.setUint8(i, v); },
'getInt8': function(i) { return this.view.getInt8(i); },
'getUint8': function(i) { return this.view.getUint8(i); }
};
var setters = ['setInt32', 'setInt16', 'setUint32', 'setUint16',
'setFloat32', 'setFloat64'];
var getters = ['getInt32', 'getInt16', 'getUint32', 'getUint16',
'getFloat32', 'getFloat64'];
for (var i=0; i<setters.length; ++i) {
var name = setters[i];
proto[name]= (function(name) {
return function(byteOffset, value) {
return this.view[name](byteOffset, value, _is_little_endian);
};
})(name);
}
for (i=0; i<getters.length; ++i) {
var name = getters[i];
proto[name]= (function(name) {
return function(byteOffset) {
return this.view[name](byteOffset, _is_little_endian);
};
})(name);
}
function my_dataView(buffer, byteOffset, byteLength) {
if (byteOffset === undefined) {
// work around node.js bug https://github.com/joyent/node/issues/6051
if (buffer.byteLength === 0) {
this.view = {
byteLength: 0, byteOffset: 0
};
} else
this.view = new DataView(buffer);
} else {
this.view = new DataView(buffer, byteOffset, byteLength);
}
};
my_dataView.prototype = proto;
return my_dataView;
})();
Rserve.my_ArrayBufferView = function(b, o, l) {
o = _.isUndefined(o) ? 0 : o;
l = _.isUndefined(l) ? b.byteLength : l;
return {
buffer: b,
offset: o,
length: l,
data_view: function() {
return new Rserve.EndianAwareDataView(this.buffer, this.offset,
this.buffer.byteLength - this.offset);
},
make: function(ctor, new_offset, new_length) {
new_offset = _.isUndefined(new_offset) ? 0 : new_offset;
new_length = _.isUndefined(new_length) ? this.length : new_length;
var element_size = ctor.BYTES_PER_ELEMENT || 1;
var n_els = new_length / element_size;
if ((this.offset + new_offset) % element_size != 0) {
var view = new DataView(this.buffer, this.offset + new_offset, new_length);
var output_buffer = new ArrayBuffer(new_length);
var out_view = new DataView(output_buffer);
for (var i=0; i < new_length; ++i) {
out_view.setUint8(i, view.getUint8(i));
}
return new ctor(output_buffer);
} else {
return new ctor(this.buffer,
this.offset + new_offset,
n_els);
}
},
skip: function(offset) {
return Rserve.my_ArrayBufferView(
this.buffer, this.offset + offset, this.buffer.byteLength);
},
view: function(new_offset, new_length) {
// FIXME Needs bounds checking
return Rserve.my_ArrayBufferView(
this.buffer, this.offset + new_offset, new_length);
}
};
};
})(this);
(function() {
function _encode_command(command, buffer) {
if (!_.isArray(buffer))
buffer = [buffer];
var length = _.reduce(buffer,
function(memo, val) {
return memo + val.byteLength;
}, 0),
big_buffer = new ArrayBuffer(16 + length),
view = new Rserve.EndianAwareDataView(big_buffer);
view.setInt32(0, command);
view.setInt32(4, length);
view.setInt32(8, 0);
view.setInt32(12, 0);
var offset = 16;
_.each(buffer, function(b) {
var source_array = new Uint8Array(b);
for (var i=0; i<source_array.byteLength; ++i)
view.setUint8(offset+i, source_array[i]);
offset += b.byteLength;
});
return big_buffer;
};
function _encode_string(str) {
var strl = ((str.length + 1) + 3) & ~3; // pad to 4-byte boundaries.
var payload_length = strl + 4;
var result = new ArrayBuffer(payload_length);
var view = new Rserve.EndianAwareDataView(result);
view.setInt32(0, Rserve.Rsrv.DT_STRING + (strl << 8));
for (var i=0; i<str.length; ++i)
view.setInt8(4+i, str.charCodeAt(i));
return result;
};
function _encode_bytes(bytes) {
var payload_length = bytes.length;
var header_length = 4;
var result = new ArrayBuffer(payload_length + header_length);
var view = new Rserve.EndianAwareDataView(result);
view.setInt32(0, Rserve.Rsrv.DT_BYTESTREAM + (payload_length << 8));
for (var i=0; i<bytes.length; ++i)
view.setInt8(4+i, bytes[i]);
return result;
};
Rserve.create = function(opts) {
opts = _.defaults(opts || {}, {
host: 'http://127.0.0.1:8081',
on_connect: function() {}
});
var host = opts.host;
var onconnect = opts.on_connect;
var socket = new WebSocket(host);
socket.binaryType = 'arraybuffer';
var handle_error = opts.on_error || function(error) { throw new Rserve.RserveError(error, -1); };
var received_handshake = false;
var result;
var command_counter = 0;
var captured_functions = {};
var fresh_hash = function() {
var k;
do {
// while js has no crypto rngs :(
k = String(Math.random()).slice(2,12);
} while (k in captured_functions);
if (k.length !== 10)
throw new Error("Bad rng, no cookie");
return k;
};
function convert_to_hash(value) {
var hash = fresh_hash();
captured_functions[hash] = value;
return hash;
}
function _encode_value(value, forced_type)
{
var sz = Rserve.determine_size(value, forced_type);
// all this will still break if sz is, say, >= 2^31.
if (sz > 16777215) {
var buffer = new ArrayBuffer(sz + 8);
var view = Rserve.my_ArrayBufferView(buffer);
// can't left shift value here because value will have bit 32 set and become signed..
view.data_view().setInt32(0, Rserve.Rsrv.DT_SEXP + ((sz & 16777215) * Math.pow(2, 8)) + Rserve.Rsrv.DT_LARGE);
// but *can* right shift because we assume sz is less than 2^31 or so to begin with
view.data_view().setInt32(4, sz >> 24);
Rserve.write_into_view(value, view.skip(8), forced_type, convert_to_hash);
return buffer;
} else {
var buffer = new ArrayBuffer(sz + 4);
var view = Rserve.my_ArrayBufferView(buffer);
view.data_view().setInt32(0, Rserve.Rsrv.DT_SEXP + (sz << 8));
Rserve.write_into_view(value, view.skip(4), forced_type, convert_to_hash);
return buffer;
}
}
function hand_shake(msg)
{
msg = msg.data;
if (typeof msg === 'string') {
if (msg.substr(0,4) !== 'Rsrv') {
handle_error("server is not an RServe instance", -1);
} else if (msg.substr(4, 4) !== '0103') {
handle_error("sorry, rserve only speaks the 0103 version of the R server protocol", -1);
} else if (msg.substr(8, 4) !== 'QAP1') {
handle_error("sorry, rserve only speaks QAP1", -1);
} else {
received_handshake = true;
if (opts.login)
result.login(opts.login);
result.running = true;
onconnect && onconnect.call(result);
}
} else {
var view = new DataView(msg);
var header = String.fromCharCode(view.getUint8(0)) +
String.fromCharCode(view.getUint8(1)) +
String.fromCharCode(view.getUint8(2)) +
String.fromCharCode(view.getUint8(3));
if (header === 'RsOC') {
received_handshake = true;
result.ocap_mode = true;
result.bare_ocap = Rserve.parse_payload(msg).value;
result.ocap = Rserve.wrap_ocap(result, result.bare_ocap);
result.running = true;
onconnect && onconnect.call(result);
} else
handle_error("Unrecognized server answer: " + header, -1);
}
}
socket.onclose = function(msg) {
result.running = false;
result.closed = true;
opts.on_close && opts.on_close(msg);
};
socket.onmessage = function(msg) {
// node.js Buffer vs ArrayBuffer workaround
if (msg.data.constructor.name === 'Buffer')
msg.data = (new Uint8Array(msg.data)).buffer;
if (opts.debug)
opts.debug.message_in && opts.debug.message_in(msg);
if (!received_handshake) {
hand_shake(msg);
return;
}
if (typeof msg.data === 'string') {
opts.on_raw_string && opts.on_raw_string(msg.data);
return;
}
var v = Rserve.parse_websocket_frame(msg.data);
if (!v.ok) {
result_callback([v.message, v.status_code], undefined);
// handle_error(v.message, v.status_code);
} else if (v.header[0] === Rserve.Rsrv.RESP_OK) {
result_callback(null, v.payload);
} else if (v.header[0] === Rserve.Rsrv.OOB_SEND) {
opts.on_data && opts.on_data(v.payload);
} else if (v.header[0] === Rserve.Rsrv.OOB_MSG) {
if (result.ocap_mode) {
var p;
try {
p = Rserve.wrap_all_ocaps(result, v.payload); // .value.json(result.resolve_hash);
} catch (e) {
_send_cmd_now(Rserve.Rsrv.RESP_ERR | Rserve.Rsrv.OOB_MSG,
_encode_string(String(e)));
return;
}
if (!_.isFunction(p[0])) {
_send_cmd_now(Rserve.Rsrv.RESP_ERR | Rserve.Rsrv.OOB_MSG,
_encode_string("OOB Messages on ocap-mode must be javascript function calls"));
return;
}
var captured_function = p[0], params = p.slice(1);
params.push(function(err, result) {
if (err) {
_send_cmd_now(Rserve.Rsrv.RESP_ERR | Rserve.Rsrv.OOB_MSG, _encode_value(err));
} else {
_send_cmd_now(Rserve.Rsrv.OOB_MSG, _encode_value(result));
}
});
captured_function.apply(undefined, params);
} else {
if (_.isUndefined(opts.on_oob_message)) {
_send_cmd_now(Rserve.Rsrv.RESP_ERR | Rserve.Rsrv.OOB_MSG,
_encode_string("No handler installed"));
} else {
in_oob_message = true;
opts.on_oob_message(v.payload, function(message, error) {
if (!in_oob_message) {
handle_error("Don't call oob_message_handler more than once.");
return;
}
in_oob_message = false;
var header = Rserve.Rsrv.OOB_MSG |
(error ? Rserve.Rsrv.RESP_ERR : Rserve.Rsrv.RESP_OK);
_send_cmd_now(header, _encode_string(message));
bump_queue();
});
}
}
} else {
handle_error("Internal Error, parse returned unexpected type " + v.header[0], -1);
}
};
function _send_cmd_now(command, buffer) {
var big_buffer = _encode_command(command, buffer);
if (opts.debug)
opts.debug.message_out && opts.debug.message_out(big_buffer[0], command);
socket.send(big_buffer);
return big_buffer;
};
var queue = [];
var in_oob_message = false;
var awaiting_result = false;
var result_callback;
function bump_queue() {
if (result.closed && queue.length) {
handle_error("Cannot send messages on a closed socket!", -1);
} else if (!awaiting_result && !in_oob_message && queue.length) {
var lst = queue.shift();
result_callback = lst[1];
awaiting_result = true;
if (opts.debug)
opts.debug.message_out && opts.debug.message_out(lst[0], lst[2]);
socket.send(lst[0]);
}
}
function enqueue(buffer, k, command) {
queue.push([buffer, function(error, result) {
awaiting_result = false;
bump_queue();
k(error, result);
}, command]);
bump_queue();
};
function _cmd(command, buffer, k, string) {
k = k || function() {};
var big_buffer = _encode_command(command, buffer);
return enqueue(big_buffer, k, string);
};
result = {
ocap_mode: false,
running: false,
closed: false,
close: function() {
socket.close();
},
//////////////////////////////////////////////////////////////////////
// non-ocap mode
login: function(command, k) {
_cmd(Rserve.Rsrv.CMD_login, _encode_string(command), k, command);
},
eval: function(command, k) {
_cmd(Rserve.Rsrv.CMD_eval, _encode_string(command), k, command);
},
createFile: function(command, k) {
_cmd(Rserve.Rsrv.CMD_createFile, _encode_string(command), k, command);
},
writeFile: function(chunk, k) {