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syndicate.js
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syndicate.js
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/*
Copyright 2016 The Trustees of University of Arizona
Licensed under the Apache License, Version 2.0 (the "License" );
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/*
* This module provides a high-level APIs to handle Syndicate Gateways
*/
var libsyndicate_node = require('./libsyndicate.js');
var libsyndicate = libsyndicate_node.libsyndicate;
var libsyndicate_ug = libsyndicate_node.libsyndicate_ug;
var posixerr = require('./posix_errors.js');
var syndicateerr = require('./errors.js');
var ref = require('ref');
var async = require('async');
function addRawStatHelpers(entry) {
entry.isFile = function() {
if(entry.type === libsyndicate_node.constants.MD_ENTRY_FILE) {
return true;
}
return false;
};
entry.isDir = function() {
if(entry.type === libsyndicate_node.constants.MD_ENTRY_DIRECTORY) {
return true;
}
return false;
};
}
function stringfyHandle(fh) {
if(fh) {
var handle = fh.deref();
var type = handle.type;
var off = handle.offset;
var addr = null;
if(type == 0) {
// directory
addr = handle.handle.fh;
} else {
// file
addr = handle.handle.dh;
}
return "Type(" + type + ")" + ", Off(" + off + ")" + ", Addr(" + addr + ")";
}
return "null";
}
/**
* Expose root class
*/
module.exports = {
// create init opts
create_opts: function(user, volume, gateway, debug_level, config_path) {
user = user || "";
volume = volume || "";
gateway = gateway || "";
debug_level = debug_level || 0;
config_path = config_path || "";
return {
user: user,
volume: volume,
gateway: gateway,
debug_level: debug_level,
config_path: config_path,
};
},
// initialize UG
init: function(opts) {
if(!opts) {
throw new Error("Invalid arguments");
}
// build syndicate arguments
var args=[];
// program name:
args.push("syndicate.js");
// config_path: -c flag
if(opts.config_path !== "") {
args.push("-c");
args.push(opts.config_path);
}
// user: -u flag
if(opts.user !== "") {
args.push("-u");
args.push(opts.user);
}
// volume: -v flag
if(opts.volume !== "") {
args.push("-v");
args.push(opts.volume);
}
// gateway: -g flag
if(opts.gateway !== "") {
args.push("-g");
args.push(opts.gateway);
}
// debug_level: -d flag
if(opts.debug_level != 0) {
args.push("-d" + opts.debug_level);
}
var ug = libsyndicate_ug.UG_init(args.length, args);
if(ug.isNull()) {
throw new Error("UG_init failed");
}
return ug;
},
// shutdown UG
shutdown: function(ug) {
if(!ug) {
throw new Error("Invalid arguments");
}
// shutdown UG
libsyndicate_ug.UG_shutdown(ug);
},
// get gateway id
get_gateway_id: function(ug) {
if(!ug) {
throw new Error("Invalid arguments");
}
// state gateway
var gateway = libsyndicate_ug.UG_state_gateway(ug);
if(gateway.isNull()) {
throw new Error("UG_state_gateway failed");
}
// get gateway id
var gid = libsyndicate.SG_gateway_id(gateway);
return gid;
},
// refresh
refresh: function(ug, path) {
if(!ug) {
throw new Error("Invalid arguments");
}
if(!path) {
throw new Error("Invalid arguments");
}
// state gateway
var gateway = libsyndicate_ug.UG_state_gateway(ug);
if(gateway.isNull()) {
throw new Error("UG_state_gateway failed");
}
var rc = libsyndicate_ug.UG_consistency_path_ensure_fresh(gateway, path);
if(rc === 0) {
rc = libsyndicate_ug.UG_consistency_request_refresh(gateway, path);
}
if(rc !== 0) {
throw posixerr.create_error("Failed to refresh '" + path + "'", -rc);
}
},
// vacuum_begin
vacuum_begin: function(ug, path) {
if(!ug) {
throw new Error("Invalid arguments");
}
if(!path) {
throw new Error("Invalid arguments");
}
var vctx = libsyndicate_node.helpers.create_UG_vacuum_context_ptr();
var rc = libsyndicate_ug.UG_vacuum_begin(ug, path, vctx);
if(rc !== 0) {
throw posixerr.create_error("Failed to vacuum_begin '" + path + "'", -rc);
}
return vctx.deref();
},
// vacuum_wait
vacuum_wait: function(vctx) {
if(!vctx) {
throw new Error("Invalid arguments");
}
var rc = libsyndicate_ug.UG_vacuum_wait(vctx);
if(rc !== 0) {
throw posixerr.create_error("Failed to vacuum_wait", -rc);
}
},
// stat
stat: function(ug, path) {
if(!ug) {
throw new Error("Invalid arguments");
}
if(!path) {
throw new Error("Invalid arguments");
}
var entry = libsyndicate_node.helpers.create_stat();
// load up...
var rc = libsyndicate_ug.UG_stat(ug, path, entry.ref());
if(rc !== 0) {
throw posixerr.create_error("Failed to stat '" + path + "'", -rc);
}
var statEntry = JSON.parse(JSON.stringify(entry));
return statEntry;
},
// stat async
stat_async: function(ug, path, callback) {
if(!ug) {
callback(new Error("Invalid arguments"), null);
return;
}
if(!path) {
callback(new Error("Invalid arguments"), null);
return;
}
var entry = libsyndicate_node.helpers.create_stat();
// load up...
libsyndicate_ug.UG_stat.async(ug, path, entry.ref(), function(err, rc) {
if(err) {
callback(err, null);
return;
}
if(rc !== 0) {
callback(posixerr.create_error("Failed to stat '" + path + "'", -rc), null);
return;
}
var statEntry = JSON.parse(JSON.stringify(entry));
callback(null, statEntry);
return;
});
},
// stat-raw
stat_raw: function(ug, path) {
if(!ug) {
throw new Error("Invalid arguments");
}
if(!path) {
throw new Error("Invalid arguments");
}
var entry = libsyndicate_node.helpers.create_md_entry();
// load up...
var rc = libsyndicate_ug.UG_stat_raw(ug, path, entry.ref());
if(rc !== 0) {
throw posixerr.create_error("Failed to stat '" + path + "'", -rc);
}
var statEntry = JSON.parse(JSON.stringify(entry));
addRawStatHelpers(statEntry);
return statEntry;
},
// stat-raw async
stat_raw_async: function(ug, path, callback) {
if(!ug) {
callback(new Error("Invalid arguments"), null);
return;
}
if(!path) {
callback(new Error("Invalid arguments"), null);
return;
}
var entry = libsyndicate_node.helpers.create_md_entry();
// load up...
libsyndicate_ug.UG_stat_raw.async(ug, path, entry.ref(), function(err, rc) {
if(err) {
callback(err, null);
return;
}
if(rc !== 0) {
callback(posixerr.create_error("Failed to stat '" + path + "'", -rc), null);
return;
}
var statEntry = JSON.parse(JSON.stringify(entry));
addRawStatHelpers(statEntry);
callback(null, statEntry);
return;
});
},
// list-dir
list_dir: function(ug, path) {
if(!ug) {
throw new Error("Invalid arguments");
}
if(!path) {
throw new Error("Invalid arguments");
}
var rc = 0;
var rc2 = libsyndicate_node.helpers.create_integer();
var dirh = libsyndicate_ug.UG_opendir(ug, path, rc2);
if(dirh.isNull()) {
throw posixerr.create_error("Failed to open directory '" + path + "'", -rc2.deref());
}
var entries = [];
while(true) {
var dirents = libsyndicate_node.helpers.create_md_entry_ptr_ptr();
rc = libsyndicate_ug.UG_readdir(ug, dirents, 1, dirh);
if(rc !== 0) {
libsyndicate_ug.UG_closedir(ug, dirh);
throw posixerr.create_error("Failed to read directory '" + path + "'", -rc);
}
var dirents_d = dirents.deref();
if(!dirents_d.isNull()) {
var dirents_d = dirents.deref();
var entry = ref.get(dirents_d, 0, ref.types.pointer);
if(entry.isNull()) {
// EOF
libsyndicate_ug.UG_free_dir_listing(dirents_d);
break;
}
var j = 0;
while(!entry.isNull()) {
var statEntry = JSON.parse(JSON.stringify(entry.deref()));
addRawStatHelpers(statEntry);
entries.push(statEntry);
j++;
entry = ref.get(dirents_d, ref.sizeof.pointer * j, ref.types.pointer);
}
libsyndicate_ug.UG_free_dir_listing(dirents_d);
} else {
// no data
break;
}
}
rc = libsyndicate_ug.UG_closedir(ug, dirh);
if(rc !== 0) {
throw posixerr.create_error("Failed to close directory '" + path + "'", -rc);
}
return entries;
},
// list-dir async.
list_dir_async: function(ug, path, callback) {
if(!ug) {
callback(new Error("Invalid arguments"), null);
return;
}
if(!path) {
callback(new Error("Invalid arguments"), null);
return;
}
var rc2 = libsyndicate_node.helpers.create_integer();
async.waterfall([
function(cb) {
libsyndicate_ug.UG_opendir.async(ug, path, rc2, function(err, dirh) {
if(err) {
cb(err, null);
return;
}
if(dirh.isNull()) {
cb(posixerr.create_error("Failed to open directory '" + path + "'", -rc2.deref()), null);
return;
}
cb(null, dirh);
});
},
function(dirh, cb) {
var entries = [];
var stopWhile = false;
async.whilst(
function() {
return !stopWhile;
},
function(loop_cb) {
var dirents = libsyndicate_node.helpers.create_md_entry_ptr_ptr();
libsyndicate_ug.UG_readdir.async(ug, dirents, 1, dirh, function(err, rc) {
if(err) {
stopWhile = true;
loop_cb(err, null);
return;
}
if(rc !== 0) {
stopWhile = true;
loop_cb(posixerr.create_error("Failed to read directory '" + path + "'", -rc), null);
return;
}
var dirents_d = dirents.deref();
if(!dirents_d.isNull()) {
var dirents_d = dirents.deref();
var entry = ref.get(dirents_d, 0, ref.types.pointer);
if(entry.isNull()) {
// EOF
libsyndicate_ug.UG_free_dir_listing(dirents_d);
stopWhile = true;
loop_cb(null, null);
return;
}
var j = 0;
while(!entry.isNull()) {
var statEntry = JSON.parse(JSON.stringify(entry.deref()));
addRawStatHelpers(statEntry);
entries.push(statEntry);
j++;
entry = ref.get(dirents_d, ref.sizeof.pointer * j, ref.types.pointer);
}
libsyndicate_ug.UG_free_dir_listing(dirents_d);
loop_cb(null, null);
return;
} else {
// no data
stopWhile = true;
loop_cb(null, null);
return;
}
});
},
function(err, data) {
libsyndicate_ug.UG_closedir.async(ug, dirh, function(cerr, rc) {
if(cerr) {
cb(cerr, null);
return;
}
if(rc !== 0) {
cb(posixerr.create_error("Failed to close directory '" + path + "'", -rc), null);
return;
}
cb(err, entries);
return;
});
}
);
}
], function(err, result) {
callback(err, result);
});
},
// create
create: function(ug, path, mode) {
if(!ug) {
throw new Error("Invalid arguments");
}
if(!path) {
throw new Error("Invalid arguments");
}
if(mode === undefined) {
// get mask
mode = ((~process.umask()) & parseInt("0777", 8));
}
var rc2 = libsyndicate_node.helpers.create_integer();
var fh = libsyndicate_ug.UG_create(ug, path, mode, rc2);
if(rc2.deref() !== 0) {
throw posixerr.create_error("Failed to create a file '" + path + "'", -rc2.deref());
} else {
return fh;
}
},
// create async.
create_async: function(ug, path, mode, callback) {
if(!ug) {
callback(new Error("Invalid arguments"), null);
return;
}
if(!path) {
callback(new Error("Invalid arguments"), null);
return;
}
if(mode === undefined) {
// get mask
mode = ((~process.umask()) & parseInt("0777", 8));
}
var rc2 = libsyndicate_node.helpers.create_integer();
libsyndicate_ug.UG_create.async(ug, path, mode, rc2, function(err, fh) {
if(err) {
callback(err, null);
return;
}
if(rc2.deref() !== 0) {
callback(posixerr.create_error("Failed to create a file '" + path + "'", -rc2.deref()), null);
return;
}
});
},
// open
open: function(ug, path, flag) {
if(!ug) {
throw new Error("Invalid arguments");
}
if(!path) {
throw new Error("Invalid arguments");
}
var seek_to_end = false;
var create = false;
var truncate = false;
if(flag === "r") {
flag = libsyndicate_node.constants.O_RDONLY;
seek_to_end = false;
create = false;
truncate = false;
} else if(flag === "w") {
flag = libsyndicate_node.constants.O_WRONLY;
seek_to_end = false;
create = true;
truncate = true;
} else if(flag === "a") {
flag = libsyndicate_node.constants.O_RDWR;
seek_to_end = true;
create = true;
truncate = false;
} else {
flag = libsyndicate_node.constants.O_RDONLY;
seek_to_end = false;
create = false;
truncate = false;
}
var rc = 0;
var rc2 = libsyndicate_node.helpers.create_integer();
var fh;
if(create) {
fh = libsyndicate_ug.UG_create(ug, path, parseInt("0540", 8), rc2);
if(rc2.deref() !== 0) {
if(rc2.deref() !== -17) {
// Not EEXIST
throw posixerr.create_error("Failed to create a file '" + path + "'", -rc2.deref());
} else {
// EEXIST
fh = libsyndicate_ug.UG_open(ug, path, flag, rc2);
if(rc2.deref() !== 0) {
throw posixerr.create_error("Failed to open a file '" + path + "'", -rc2.deref());
}
if(truncate) {
rc = libsyndicate_ug.UG_ftruncate(ug, 0, fh);
if(rc !== 0) {
libsyndicate_ug.UG_close(ug, fh);
throw posixerr.create_error("Failed to truncate a file '" + path + "'", -rc);
}
}
}
}
} else {
fh = libsyndicate_ug.UG_open(ug, path, flag, rc2);
if(rc2.deref() !== 0) {
throw posixerr.create_error("Failed to open a file '" + path + "'", -rc2.deref());
}
}
if(seek_to_end) {
// SEEK
var new_offset = libsyndicate_ug.UG_seek(fh, 0, libsyndicate_node.constants.SEEK_END);
if(new_offset < 0) {
libsyndicate_ug.UG_close(ug, fh);
throw posixerr.create_error("Failed to seek a file '" + path + "'", -new_offset);
}
}
return fh;
},
// open async.
open_async: function(ug, path, flag, callback) {
if(!ug) {
callback(new Error("Invalid arguments"), null);
return;
}
if(!path) {
callback(new Error("Invalid arguments"), null);
return;
}
var seek_to_end = false;
var create = false;
var truncate = false;
if(flag === "r") {
flag = libsyndicate_node.constants.O_RDONLY;
seek_to_end = false;
create = false;
truncate = false;
} else if(flag === "w") {
flag = libsyndicate_node.constants.O_WRONLY;
seek_to_end = false;
create = true;
truncate = true;
} else if(flag === "a") {
flag = libsyndicate_node.constants.O_RDWR;
seek_to_end = true;
create = true;
truncate = false;
} else {
flag = libsyndicate_node.constants.O_RDONLY;
seek_to_end = false;
create = false;
truncate = false;
}
var rc = 0;
var rc2 = libsyndicate_node.helpers.create_integer();
if(create) {
libsyndicate_ug.UG_create.async(ug, path, parseInt("0540", 8), rc2, function(err, fh) {
if(err) {
callback(err, null);
return;
}
if(rc2.deref() !== 0) {
if(rc2.deref() !== -17) {
// Not EEXIST
callback(posixerr.create_error("Failed to create a file '" + path + "'", -rc2.deref()), null);
return;
} else {
// EEXIST
libsyndicate_ug.UG_open.async(ug, path, flag, rc2, function(err, fh) {
if(err) {
callback(err, null);
return;
}
if(rc2.deref() !== 0) {
callback(posixerr.create_error("Failed to open a file '" + path + "'", -rc2.deref()), null);
return;
}
async.waterfall([
function(cb) {
if(truncate) {
libsyndicate_ug.UG_ftruncate.async(ug, 0, fh, function(err, rc) {
if(err) {
cb(err, null);
return;
}
if(rc !== 0) {
libsyndicate_ug.UG_close.async(ug, fh, function(err, data) {
if(err) {
cb(err, null);
return;
}
cb(posixerr.create_error("Failed to truncate a file '" + path + "'", -rc), null);
return;
});
} else {
cb(null, fh);
return;
}
});
} else {
cb(null, fh);
return;
}
},
function(fh, cb) {
if(seek_to_end) {
// SEEK
libsyndicate_ug.UG_seek.async(fh, 0, libsyndicate_node.constants.SEEK_END, function(err, new_offset) {
if(err) {
cb(err, null);
return;
}
if(new_offset < 0) {
libsyndicate_ug.UG_close.async(ug, fh, function(err, data) {
if(err) {
cb(err, null);
return;
}
cb(posixerr.create_error("Failed to seek a file '" + path + "'", -new_offset), null);
return;
});
}
cb(null, fh);
return;
});
} else {
cb(null, fh);
return;
}
}
],
function(err, fh) {
if(err) {
callback(err, null);
return;
}
callback(err, fh);
return;
});
});
}
} else {
callback(err, fh);
return;
}
});
} else {
libsyndicate_ug.UG_open.async(ug, path, flag, rc2, function(err, fh) {
if(err) {
callback(err, null);
return;
}
if(rc2.deref() !== 0) {
callback(posixerr.create_error("Failed to open a file '" + path + "'", -rc2.deref()), null);
return;
} else {
callback(err, fh);
return;
}
});
}
},
// close
close: function(ug, fh) {
if(!ug) {
throw new Error("Invalid arguments");
}
if(!fh) {
throw new Error("Invalid arguments");
}
var rc = libsyndicate_ug.UG_close(ug, fh);
if(rc !== 0) {
throw posixerr.create_error("Failed to close a file '" + stringfyHandle(fh) + "'", -rc);
}
},
// close async.
close_async: function(ug, fh, callback) {
if(!ug) {
callback(new Error("Invalid arguments"), null);
return;
}
if(!fh) {
callback(new Error("Invalid arguments"), null);
return;
}
libsyndicate_ug.UG_close.async(ug, fh, function(err, rc) {
if(err) {
callback(err, null);
return;
}
if(rc !== 0) {
callback(posixerr.create_error("Failed to close a file '" + stringfyHandle(fh) + "'", -rc), null);
return;
}
callback(null, null);
return;
});
},
// fsync
fsync: function(ug, fh) {
if(!ug) {
throw new Error("Invalid arguments");
}
if(!fh) {
throw new Error("Invalid arguments");
}
var rc = libsyndicate_ug.UG_fsync(ug, fh);
if(rc !== 0) {
throw posixerr.create_error("Failed to sync a file '" + stringfyHandle(fh) + "'", -rc);
}
},
// fsync async
fsync_async: function(ug, fh, callback) {
if(!ug) {
callback(new Error("Invalid arguments"), null);
return;
}
if(!fh) {
callback(new Error("Invalid arguments"), null);
return;
}
libsyndicate_ug.UG_fsync.async(ug, fh, function(err, rc) {
if(err) {
callback(err, null);
return;
}
if(rc !== 0) {
callback(posixerr.create_error("Failed to sync a file '" + stringfyHandle(fh) + "'", -rc), null);
return;
}
callback(null, null);
return;
});
},
// tell
tell: function(ug, fh) {
if(!ug) {
throw new Error("Invalid arguments");
}
if(!fh) {
throw new Error("Invalid arguments");
}
// TELL
var offset = 0;
var handle = fh.deref();
offset = handle.offset;
if(offset >= 0) {
return offset;
} else {
throw posixerr.create_error("Failed to tell a file '" + stringfyHandle(fh) + "'", 9); // EBADF
}
},
// tell async.
tell_async: function(ug, fh, callback) {
if(!ug) {
callback(new Error("Invalid arguments"), null);
return;
}
if(!fh) {
callback(new Error("Invalid arguments"), null);
return;
}
// seek
var offset = 0;
var handle = fh.deref();
offset = handle.offset;
if(offset >= 0) {
callback(null, offset);
return;
} else {
callback(posixerr.create_error("Failed to tell a file '" + stringfyHandle(fh) + "'", 9), null); // EBADF
return;
}
},
// seek
seek: function(ug, fh, offset) {
if(!ug) {
throw new Error("Invalid arguments");
}
if(!fh) {
throw new Error("Invalid arguments");
}
if(offset < 0) {
throw new Error("Invalid arguments");
}
// SEEK
var new_offset = libsyndicate_ug.UG_seek(fh, offset, libsyndicate_node.constants.SEEK_SET);
if(new_offset < 0) {
throw posixerr.create_error("Failed to seek a file '" + stringfyHandle(fh) + "'", -new_offset);
}
return new_offset;
},
// seek async.
seek_async: function(ug, fh, offset, callback) {
if(!ug) {
callback(new Error("Invalid arguments"), null);
return;
}
if(!fh) {
callback(new Error("Invalid arguments"), null);
return;
}
if(offset < 0) {
callback(new Error("Invalid arguments"), null);
return;
}
// seek
libsyndicate_ug.UG_seek.async(fh, offset, libsyndicate_node.constants.SEEK_SET, function(err, new_offset) {
if(err) {
callback(err, null);
return;
}
if(new_offset < 0) {
callback(posixerr.create_error("Failed to seek a file '" + stringfyHandle(fh) + "'", -new_offset), null);
return;
}
callback(null, new_offset);
return;
});
},
// read
read: function(ug, fh, size) {
if(!ug) {
throw new Error("Invalid arguments");
}
if(!fh) {
throw new Error("Invalid arguments");
}
if(size < 0) {
throw new Error("Invalid arguments");
}
// make a return buffer
var ret_buf = new Buffer(size);
if( ret_buf.isNull() ) {
throw new Error("Failed to create a buffer: Out of memory");
}
ret_buf.type = ref.types.CString;
// make a read buffer
var read_buf = new Buffer(size);
if( read_buf.isNull() ) {
throw new Error("Failed to create a buffer: Out of memory");
}
read_buf.type = ref.types.CString;
// READ
var size_left = size;
var size_read_total = 0;
while(size_left > 0) {
var size_read = libsyndicate_ug.UG_read(ug, read_buf, size_left, fh);
if(size_read < 0) {
throw posixerr.create_error("Failed to read a file '" + stringfyHandle(fh) + "'", -size_read);
} else if(size_read === 0) {
// EOF
break;
} else {
read_buf.copy(ret_buf, size_read_total, 0, size_read);
size_left -= size_read;
size_read_total += size_read;
}
}
return ret_buf.slice(0, size_read_total);
},
// read async.
read_async: function(ug, fh, size, callback) {
if(!ug) {
callback(new Error("Invalid arguments"), null);
return;
}
if(!fh) {
callback(new Error("Invalid arguments"), null);
return;