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Synchronizer.js
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var should = require("should");
var JsonUtil = require("./JsonUtil");
var Logger = require("./Logger");
// OVERVIEW
// --------
// Synchronizer instances are used to synchronize JSON trees with their remote
// clones using a simple three-step request/response message protocol.
// JSON messages are created by createSyncRequest() and applied by sync():
// STEP1: clone.createSyncRequest() => message
// STEP2: base.sync(message) => newMessage
// STEP3: clone.sync(newMessage)
//
// Synchronization frequently happens in the context of a
// clone-requested base transformation, which can be functionally
// handled with two synchronizations. The first interaction synchronizes
// clone/base trees prior to the clone-requested base
// transformation. The second interaction synchronizes the clone with
// the results of the clone-requested base transformation.
// However, given the cost of synchronizing remote clones, this
// double synchronization should ideally happen as a single transaction.
// To minimize potentially costly clone/base interaction,
// you can optimize base post-sync transformations with syncUpdate():
//
// Method #1: inefficient double sync()
// clone.createSyncRequest() => message
// base.sync(message) => newMessage
// clone.sync(newMessage)
// clone.createSyncRequest() => message2
// base.postSyncTransformation(...);
// base.sync(message2) => postTransformMessage
// clone.sync(postTransformMessage)
//
// Method #2: optimized interaction with syncUpdate()
// clone.createSyncRequest() => message
// base.sync(message) => newMessage
// base.postSyncTransformation(...);
// base.syncUpdate(newMessage) => postTransformMessage
// clone.sync(postTransformMessage)
//
// MESSAGE ATTRIBUTES
// ------------------
// op: message operation
// newRev: model snapshot revision
// syncRev: cloned base model revision
// model: full synchronization data
// diff: differential synchronization data
// text: message text
//
// SYNCHRONIZATION STATES
// ----------------------
// S0 Uninitialized
// SB Base
// SBD Base (with changes)
// SC Synchronized clone
// SCX Synchronized clone (stale)
// SCD Synchronized clone (with changes)
// SCDX Synchronized clone (stale with changes)
//
// OP newRev syncRev model diff DESCRIPTION
// ------------------------------------------------------------
// CLONE clone synchronization request
// RETRY retry later
// SYNC RRR MMM synchronize clone with model MMM and syncRev RRR
// UPDB SSS request update for clone
// UPDB SSS DDD request update for clone; update base with clone changes DDD
// UPDC RRR SSS DDD update clone with new syncRev RRR and base changes DDD since SSS
// UPDC RRR SSS update clone with new syncRev RRR; no base changes for clone
// STALE RRR MMM synchronize stale clone with model MMM and syncRev RRR
// ERR sadness and disaster
// OK SSS no action required (clone synchronized response)
// IDLE enter idle state and only createSyncRequests() if clone has changes or is watching base
(function(exports) {
var verboseLogger = new Logger({
logLevel: "debug"
});
function Synchronizer(model, options) {
var that = this;
options = options || {};
that.model = model;
that.idle = false;
(typeof options.beforeUpdate === 'function') && (that.beforeUpdate = options.beforeUpdate);
(typeof options.afterUpdate === 'function') && (that.afterUpdate = options.afterUpdate);
(typeof options.beforeRebase === 'function') && (that.beforeRebase = options.beforeRebase);
that.baseRev = 0;
if (options.verbose) {
that.verbose = options.verbose;
}
return that;
}
Synchronizer.prototype.createSyncRequest = function(options) {
var that = this;
if (that.baseRev === 0) {
return {
op: Synchronizer.OP_CLONE,
};
}
options = options || {};
var snapshot = JSON.stringify(that.model);
if (snapshot === that.baseSnapshot) { // no clone changes
if (that.idle && !options.pollBase) {
return null;
}
that.idle = false;
return {
op: Synchronizer.OP_UPDB,
syncRev: that.syncRev,
};
}
that.idle = false;
var diff = JsonUtil.diffUpsert(that.model, that.baseModel, {
filter$: true,
});
if (diff == null) {
that.rebase(); // clone has been edited without differences
return {
op: Synchronizer.OP_UPDB,
syncRev: that.syncRev,
};
}
return {
op: Synchronizer.OP_UPDB,
syncRev: that.syncRev,
diff: diff,
};
}
Synchronizer.prototype.rebase = function() {
var that = this;
var snapshot = JSON.stringify(that.model);
if (snapshot != that.baseSnapshot) {
that.beforeRebase && that.beforeRebase(that.model);
that.baseSnapshot = JSON.stringify(that.model); // include decorations
that.baseModel = JSON.parse(that.baseSnapshot);
that.baseRev = Synchronizer.revision(that.baseSnapshot);
}
return that;
}
Synchronizer.prototype.createErrorResponse = function(request, text) {
var that = this;
that.verbose && verboseLogger.debug("Synchronizer.createErrorResponse() text:", text,
" request:", JSON.stringify(request));
return {
op: Synchronizer.OP_ERR,
text: text,
}
}
Synchronizer.prototype.sync_clone = function(request) {
var that = this;
if (request.op !== Synchronizer.OP_CLONE) {
return null;
}
if (that.baseRev === 0 || that.baseRev == null) {
return {
op: Synchronizer.OP_RETRY,
text: Synchronizer.TEXT_RETRY,
}
}
that.rebase();
//that.verbose && verboseLogger.debug("Synchronizer.sync_clone() baseRev:", that.baseRev);
return {
op: Synchronizer.OP_SYNC,
newRev: that.baseRev,
text: Synchronizer.TEXT_SYNC,
model: that.model,
}
}
Synchronizer.prototype.sync_echo = function(request, op) {
var that = this;
if (request.op !== op) {
return null;
}
return request;
}
Synchronizer.prototype.sync_idle = function(request) {
var that = this;
if (request.op !== Synchronizer.OP_IDLE) {
return null;
}
that.idle = true;
return request;
}
Synchronizer.prototype.sync_sync = function(request) {
var that = this;
if (request.op !== Synchronizer.OP_SYNC) {
return null;
}
if (!request.hasOwnProperty("model")) {
return that.createErrorResponse(request, Synchronizer.ERR_MODEL);
} else if (!request.hasOwnProperty("newRev")) {
return that.createErrorResponse(request, Synchronizer.ERR_NEWREV);
}
that.update(request.model);
that.rebase();
that.syncRev = request.newRev;
return {
op: Synchronizer.OP_OK,
text: Synchronizer.TEXT_CLONED,
syncRev: that.syncRev,
};
}
Synchronizer.prototype.sync_stale = function(request) {
var that = this;
if (request.op !== Synchronizer.OP_STALE) {
return null;
}
if (!request.hasOwnProperty("model")) {
return that.createErrorResponse(request, Synchronizer.ERR_MODEL);
} else if (!request.hasOwnProperty("newRev")) {
return that.createErrorResponse(request, Synchronizer.ERR_NEWREV);
}
// TODO: Deal with stale model
// for now, slam and hope for the best (ugly)
that.update(request.model);
that.rebase(); // TODO: new clone structures won't get sync'd
that.syncRev = request.newRev;
return {
op: Synchronizer.OP_OK,
text: Synchronizer.TEXT_CLONED,
syncRev: that.syncRev,
};
}
Synchronizer.prototype.sync_updb = function(request) {
var that = this;
if (request.op !== Synchronizer.OP_UPDB) {
return null;
}
if (!request.hasOwnProperty("syncRev")) {
return that.createErrorResponse(request, Synchronizer.ERR_SYNCREV);
}
if (request.syncRev !== that.baseRev) {
that.rebase();
return {
op: Synchronizer.OP_STALE,
text: Synchronizer.TEXT_STALE,
newRev: that.baseRev,
model: that.baseModel,
}
}
var response = {};
var baseModel = that.baseModel;
that.update(request.diff);
request.diff && JsonUtil.applyJson(baseModel, request.diff);
that.rebase();
var diff = JsonUtil.diffUpsert(that.model, baseModel);
//console.log("UPDATE model:" + JSON.stringify(that.model), " baseModel:" + JSON.stringify(baseModel));
if (diff == null) {
if (request.diff) {
response.op = Synchronizer.OP_UPDC;
response.text = Synchronizer.TEXT_UPDB;
response.syncRev = request.syncRev;
response.newRev = that.baseRev;
} else {
response.op = Synchronizer.OP_IDLE;
response.text = Synchronizer.TEXT_IDLE;
}
response.syncRev = request.syncRev;
} else {
response.op = Synchronizer.OP_UPDC;
response.diff = diff;
response.text = Synchronizer.TEXT_UPDC;
response.syncRev = request.syncRev;
response.newRev = that.baseRev;
}
return response;
}
Synchronizer.prototype.sync_updc = function(request) {
var that = this;
if (request.op !== Synchronizer.OP_UPDC) {
return null;
}
if (!request.hasOwnProperty("newRev")) {
return that.createErrorResponse(request, Synchronizer.ERR_NEWREV);
} else if (!request.hasOwnProperty("syncRev")) {
return that.createErrorResponse(request, Synchronizer.ERR_SYNCREV);
} else if (request.syncRev !== that.syncRev) {
return that.createErrorResponse(request, Synchronizer.ERR_STALE);
}
var response = {};
that.syncRev = request.newRev;
response.syncRev = that.syncRev;
that.update(request.diff);
that.rebase();
response.op = Synchronizer.OP_OK;
response.text = Synchronizer.TEXT_SYNC;
return response;
}
Synchronizer.prototype.sync = function(request) {
var that = this;
request = request || {
op: Synchronizer.OP_CLONE,
};
if (request.op == null) {
return that.createErrorResponse(request, Synchronizer.ERR_OP);
}
var response = that.sync_clone(request) ||
that.sync_echo(request, Synchronizer.OP_ERR) ||
that.sync_echo(request, Synchronizer.OP_OK) ||
that.sync_echo(request, Synchronizer.OP_RETRY) ||
that.sync_idle(request) ||
that.sync_updb(request) ||
that.sync_updc(request) ||
that.sync_stale(request) ||
that.sync_sync(request);
if (!response) {
throw new Error("Synchronizer.sync() unhandled request:" + JSON.stringify(request));
}
return response;
}
Synchronizer.prototype.syncUpdate = function(curResponse) {
var that = this;
if (curResponse.op === Synchronizer.OP_IDLE) {
var newResponse = that.sync({
op: "UPDB",
syncRev: curResponse.syncRev,
});
} else {
var newResponse = that.sync({
op: "UPDB",
syncRev: curResponse.newRev,
});
curResponse = JSON.parse(JSON.stringify(curResponse));
var diff = curResponse.diff || {};
newResponse.syncRev = curResponse.syncRev;
JsonUtil.applyJson(diff, newResponse.diff);
newResponse.diff = diff;
}
return newResponse;
}
Synchronizer.prototype.update = function(diff) {
var that = this;
that.beforeUpdate && that.beforeUpdate(diff);
diff && JsonUtil.applyJson(that.model, diff);
that.afterUpdate && that.afterUpdate(diff);
return that;
}
Synchronizer.TEXT_RETRY = "Retry: base model uninitialized";
Synchronizer.TEXT_STALE = "Stale: B#>C UPDB ignored. Response includes base model";
Synchronizer.TEXT_SYNC = "SyncBC: B<=>C models updated and synchronized";
Synchronizer.TEXT_UPDB = "SyncB: B<=C models updated and synchronized";
Synchronizer.TEXT_UPDC = "UPDC: B=>C base updated; clone synchronization pending";
Synchronizer.TEXT_REBASE = "Rebase: B!>C stale request ignored";
Synchronizer.TEXT_CLONED = "Cloned: B>>C base model cloned and synchronized";
Synchronizer.TEXT_IDLE = "Idle: no changes to base or clone models";
Synchronizer.ERR_OP = "Error: op expected";
Synchronizer.ERR_MODEL = "Error: model expected";
Synchronizer.ERR_NEWREV = "Error: newRev expected";
Synchronizer.ERR_SYNCREV = "Error: syncRev expected";
Synchronizer.ERR_DIFF = "Error: diff expected";
Synchronizer.ERR_STALE = "Error: unknown syncRev for clone";
Synchronizer.OP_CLONE = "CLONE";
Synchronizer.OP_RETRY = "RETRY";
Synchronizer.OP_SYNC = "SYNC";
Synchronizer.OP_STALE = "STALE";
Synchronizer.OP_UPDB = "UPDB";
Synchronizer.OP_UPDC = "UPDC";
Synchronizer.OP_OK = "OK";
Synchronizer.OP_IDLE = "IDLE";
Synchronizer.OP_ERR = "ERR";
Synchronizer.revision = function(model) {
if (typeof model === 'string') {
var json = model;
} else {
var json = model == null ? "" : JSON.stringify(model);
}
if (json.length === 0) {
return 0;
}
var sum1 = 0;
var sum2 = 0;
var sum3 = 0;
var sum5 = 0;
var sum7 = 0;
var sum11 = 0;
var sum13 = 0;
for (var i = json.length; i-- > 0;) {
var code = json.charCodeAt(i);
sum1 += code;
(i % 2 === 0) && (sum2 += code);
(i % 3 === 0) && (sum3 += code);
(i % 5 === 0) && (sum5 += code);
(i % 7 === 0) && (sum7 += code);
(i % 11 === 0) && (sum11 += code);
(i % 13 === 0) && (sum13 += code);
}
var result = (json.length + 1) / (sum1 + 1) + ((sum2 << 2) ^ (sum3 << 3) ^ (sum5 << 5) ^ (sum7 << 7) ^ (sum11 << 11) ^ (sum13 << 13));
//console.log("Synchronizer.revision()", result, " json:", json);
return result;
}
module.exports = exports.Synchronizer = Synchronizer;
})(typeof exports === "object" ? exports : (exports = {}));
// mocha -R min --inline-diffs *.js
(typeof describe === 'function') && describe("Synchronizer", function() {
var Synchronizer = exports.Synchronizer;
var beforeRebase = function(model) {
model.d = model.d ? model.d + 10 : 10;
}
var baseOptions = {
verbose: true,
beforeRebase: beforeRebase,
};
var testScenario = function(isRebase, isSync, isbeforeRebase, beforeUpdate, afterUpdate, baseModel) {
baseModel = baseModel || JSON.parse('{"a": 1}');
var scenario = {
baseModel: baseModel,
cloneModel: {},
};
var baseOptions = {
verbose: true,
};
var cloneOptions = {
beforeUpdate: beforeUpdate,
afterUpdate: afterUpdate,
};
beforeUpdate && (typeof beforeUpdate).should.equal("function");
afterUpdate && (typeof afterUpdate).should.equal("function");
isbeforeRebase != false && (baseOptions.beforeRebase = beforeRebase);
scenario.baseSync = new Synchronizer(scenario.baseModel, baseOptions);
scenario.cloneSync = new Synchronizer(scenario.cloneModel, cloneOptions);
isRebase && scenario.baseSync.rebase();
if (isSync) {
scenario.cloneSync.sync(
scenario.baseSync.sync(
scenario.cloneSync.createSyncRequest()));
should.deepEqual(scenario.cloneModel, scenario.baseModel);
}
return scenario;
}
it("createSyncRequest() returns synchronization request or null", function() {
var baseModel = {
a: 1,
b: 2,
c: 3,
};
var baseSync = new Synchronizer(baseModel);
baseSync.rebase();
var cloneModel = {};
var cloneSync = new Synchronizer(cloneModel);
var messages = [];
messages.push(cloneSync.createSyncRequest());
should.deepEqual(messages[0], {
op: Synchronizer.OP_CLONE,
});
messages.push(baseSync.sync(messages[messages.length - 1]));
messages.push(cloneSync.sync(messages[messages.length - 1]));
should.deepEqual(cloneModel, {
a: 1,
b: 2,
c: 3,
});
var cloneBaseRev = cloneSync.baseRev;
should.deepEqual(cloneSync.createSyncRequest(), {
op: Synchronizer.OP_UPDB,
syncRev: cloneSync.syncRev,
});
cloneBaseRev.should.equal(cloneSync.baseRev);
// baseRev changes, but not content
delete cloneModel.a;
delete cloneModel.b;
delete cloneModel.c;
cloneModel.b = 2; // change creation order
cloneModel.c = 3; // change creation order
cloneModel.a = 1; // change creation order
should.deepEqual(cloneSync.createSyncRequest(), {
op: Synchronizer.OP_UPDB,
syncRev: cloneSync.syncRev,
});
cloneBaseRev.should.not.equal(cloneSync.baseRev); // different serialization of same content
// baseRev and content changes
cloneModel.a = 10;
should.deepEqual(cloneSync.createSyncRequest(), {
op: Synchronizer.OP_UPDB,
syncRev: cloneSync.syncRev,
diff: {
a: 10,
},
});
});
it("sync() returns initial synchronization model", function() {
var baseModel = {
a: 1,
};
var syncBase = new Synchronizer(baseModel, baseOptions);
var expected1 = {
op: Synchronizer.OP_RETRY,
text: Synchronizer.TEXT_RETRY,
};
should.deepEqual(syncBase.sync(), expected1);
should.deepEqual(syncBase.sync(), expected1); // idempotent
// base model changes but remains uninitialized
baseModel.a = 2;
should.deepEqual(syncBase.sync(), expected1);
should.deepEqual(syncBase.sync(), expected1); // idempotent
// rebase() marks first synchronizable version
should.deepEqual(syncBase.rebase(), syncBase);
var modelExpected = {
a: 2,
d: 10,
};
should.deepEqual(syncBase.sync(), {
op: Synchronizer.OP_SYNC,
newRev: syncBase.baseRev,
text: Synchronizer.TEXT_SYNC,
model: modelExpected,
});
// base model changes
baseModel.a = 3;
var modelExpected3 = {
a: 3,
d: 20,
};
var expected3 = {
op: Synchronizer.OP_SYNC,
text: Synchronizer.TEXT_SYNC,
newRev: Synchronizer.revision(modelExpected3),
model: modelExpected3,
};
should.deepEqual(syncBase.sync(), expected3);
should.deepEqual(syncBase.sync(), expected3); // idempotent
});
it("rebase() marks model as initialized", function() {
var baseModel = {
a: 1,
};
var syncBase = new Synchronizer(baseModel, baseOptions);
var modelExpected = {
a: 1,
d: 10,
};
var expected1 = {
op: Synchronizer.OP_SYNC,
text: Synchronizer.TEXT_SYNC,
newRev: Synchronizer.revision(modelExpected),
model: modelExpected,
}
should.deepEqual(syncBase.rebase(), syncBase);
should.deepEqual(syncBase.sync(), expected1);
});
it("sync(initial) initializes clone model", function() {
var baseModel = {
a: {
aa: 1
},
};
var syncBase = new Synchronizer(baseModel, baseOptions);
var clonea = {
aa: 2,
};
var cloneModel = {
a: clonea,
};
var syncClone = new Synchronizer(cloneModel);
// nothing should happen with uninitialized models
var initial = syncBase.sync();
var expected1 = {
op: Synchronizer.OP_RETRY,
text: Synchronizer.TEXT_RETRY,
};
should.deepEqual(initial, expected1);
should.deepEqual(syncClone.sync(initial), expected1);
should.deepEqual(syncClone.sync(initial), expected1); // idempotent
syncBase.rebase();
// error message
should.deepEqual(syncClone.sync({
newRev: 1,
}), {
op: Synchronizer.OP_ERR,
text: Synchronizer.ERR_OP,
});
should.deepEqual(syncClone.sync({
op: Synchronizer.OP_SYNC,
newRev: 1,
}), {
op: Synchronizer.OP_ERR,
text: Synchronizer.ERR_MODEL
});
should.deepEqual(syncClone.sync({
op: Synchronizer.OP_SYNC,
model: {},
}), {
op: Synchronizer.OP_ERR,
text: Synchronizer.ERR_NEWREV,
});
// synchronize to base model
clonea.aa.should.equal(2);
initial = syncBase.sync(); // OP_SYNC
var expectedSync = {
op: Synchronizer.OP_OK,
syncRev: syncBase.baseRev,
text: Synchronizer.TEXT_CLONED,
};
should.deepEqual(syncClone.sync(initial), expectedSync);
should.deepEqual(cloneModel, baseModel);
//JSON.stringify(cloneModel).should.equal(JSON.stringify(baseModel));
syncBase.baseRev.should.equal(syncClone.baseRev);
// IMPORTANT: synchronization should maintain clone structure
clonea.aa.should.equal(1);
should.deepEqual(syncClone.sync(initial), expectedSync); // idempotent
// re-synchronizate after clone changes
cloneModel.a.aa = 11;
cloneModel.c = 3;
should.deepEqual(syncClone.sync(initial), expectedSync);
cloneModel.a.aa.should.equal(1); // synchronize overwrites change to base model attribute
cloneModel.c.should.equal(3); // synchronize ignores non base model attribute
});
it("revision(model) returns the revision hash code for the given model", function() {
var j1 = {
a: 1,
};
Synchronizer.revision({
a: 1
}).should.equal(827036.0153550864);
Synchronizer.revision(JSON.stringify(j1)).should.equal(827036.0153550864);
Synchronizer.revision("").should.equal(0);
Synchronizer.revision().should.equal(0);
});
it("3-step synchronization should initialize clone", function() {
var so = testScenario(true, false);
var messages = [];
messages.push(so.cloneSync.createSyncRequest()); // step 1
messages.push(so.baseSync.sync(messages[0])); // step 2
messages.push(so.cloneSync.sync(messages[1])); // step 3
should.deepEqual(messages[0], {
op: Synchronizer.OP_CLONE,
});
var model2 = {
a: 1,
d: 10,
};
should.deepEqual(messages[1], {
op: Synchronizer.OP_SYNC,
text: Synchronizer.TEXT_SYNC,
newRev: so.baseSync.baseRev,
model: model2,
});
so.baseSync.baseRev.should.equal(Synchronizer.revision(model2));
should.deepEqual(messages[2], {
op: Synchronizer.OP_OK,
text: Synchronizer.TEXT_CLONED,
syncRev: so.baseSync.baseRev,
});
should.deepEqual(so.cloneModel, so.baseModel);
should.deepEqual(so.baseModel, {
a: 1,
d: 10,
});
so.cloneSync.syncRev.should.equal(so.baseSync.baseRev);
});
it("3-step synchronization accepts clone-only change", function() {
var so = testScenario(true, true, false);
var syncRev1 = so.cloneSync.syncRev; // initial syncRev
so.cloneModel.b = 2; // clone change
var messages = [];
messages.push(so.cloneSync.createSyncRequest()); // step 1
messages.push(so.baseSync.sync(messages[messages.length - 1])); // step 2
messages.push(so.cloneSync.sync(messages[messages.length - 1])); // step 3
messages.push(so.cloneSync.createSyncRequest()); // step 1
messages.push(so.baseSync.sync(messages[messages.length - 1])); // step 2
messages.push(so.cloneSync.sync(messages[messages.length - 1])); // step 3
should.deepEqual(messages[0], {
op: Synchronizer.OP_UPDB,
syncRev: syncRev1,
diff: {
b: 2, // clone change
}
});
should.deepEqual(messages[1], {
op: Synchronizer.OP_UPDC,
text: Synchronizer.TEXT_UPDB,
syncRev: messages[0].syncRev,
newRev: so.baseSync.baseRev,
});
should.deepEqual(messages[2], {
op: Synchronizer.OP_OK,
text: Synchronizer.TEXT_SYNC,
syncRev: so.baseSync.baseRev,
});
should.deepEqual(so.cloneModel, so.baseModel);
});
it("beforeRebase callback may change base and require clone update", function() {
var so = testScenario(true, true);
var syncRev1 = so.cloneSync.syncRev; // initial syncRev
so.cloneModel.b = 2; // clone change
var messages = [];
messages.push(so.cloneSync.createSyncRequest()); // step 1
messages.push(so.baseSync.sync(messages[0])); // step 2
messages.push(so.cloneSync.sync(messages[1])); // step 3
should.deepEqual(messages[0], {
op: Synchronizer.OP_UPDB,
syncRev: syncRev1,
diff: {
b: 2, // clone change
}
});
should.deepEqual(messages[1], {
op: Synchronizer.OP_UPDC,
text: Synchronizer.TEXT_UPDC,
syncRev: messages[0].syncRev,
newRev: so.baseSync.baseRev,
diff: {
d: 20, // base decoration
}
});
should.deepEqual(messages[2], {
op: Synchronizer.OP_OK,
text: Synchronizer.TEXT_SYNC,
syncRev: so.baseSync.baseRev,
});
should.deepEqual(so.cloneModel, so.baseModel);
});
it("3-step synchronization enter idle state if base and clone have no changes", function() {
var so = testScenario(true, true);
var messages = [];
messages.push(so.cloneSync.createSyncRequest()); // step 1
messages.push(so.baseSync.sync(messages[0])); // step 2
messages.push(so.cloneSync.sync(messages[1])); // step 3
should.deepEqual(messages[0], {
op: Synchronizer.OP_UPDB,
syncRev: so.cloneSync.syncRev,
});
should.deepEqual(messages[1], {
op: Synchronizer.OP_IDLE,
text: Synchronizer.TEXT_IDLE,
syncRev: messages[0].syncRev,
});
should.deepEqual(messages[2], {
op: Synchronizer.OP_IDLE,
text: Synchronizer.TEXT_IDLE,
syncRev: messages[0].syncRev,
});
should.deepEqual(so.cloneModel, so.baseModel);
// go silent until change
should(so.cloneSync.createSyncRequest()).equal(null);
// pollBase option should create request even if clone hasn't changed
should.deepEqual(so.cloneSync.createSyncRequest({
pollBase: true
}), {
op: Synchronizer.OP_UPDB,
syncRev: so.cloneSync.syncRev,
});
// clone changes
so.cloneModel.a = 100;
should.deepEqual(so.cloneSync.createSyncRequest(), {
op: Synchronizer.OP_UPDB,
syncRev: so.cloneSync.syncRev,
diff: {
a: 100,
}
});
});
it("3-step synchronization should handle base changes", function() {
var so = testScenario(true, true);
var syncRev1 = so.baseSync.baseRev;
so.baseModel.a = 11; // base change
var messages = [];
messages.push(so.cloneSync.createSyncRequest()); // step 1
messages.push(so.baseSync.sync(messages[0])); // step 2
messages.push(so.cloneSync.sync(messages[1])); // step 3
should.deepEqual(messages[0], {
op: Synchronizer.OP_UPDB,
syncRev: syncRev1,
});
should.deepEqual(messages[1], {
op: Synchronizer.OP_UPDC,
text: Synchronizer.TEXT_UPDC,
syncRev: messages[0].syncRev,
newRev: so.baseSync.baseRev,
diff: {
a: 11, // base change
d: 20, // base decoration
}
});
should.deepEqual(messages[2], {
op: Synchronizer.OP_OK,
text: Synchronizer.TEXT_SYNC,
syncRev: so.baseSync.baseRev,
});
should.deepEqual(so.cloneModel, so.baseModel);
should.deepEqual(so.cloneModel, {
a: 11,
d: 20,
});
});
it("3-step synchronization should handle base+clone changes", function() {
var so = testScenario(true, true);
var syncRev1 = so.baseSync.baseRev;
so.baseModel.a = 11; // base change
so.cloneModel.b = 2; // clone change
var messages = [];
messages.push(so.cloneSync.createSyncRequest()); // step 1
messages.push(so.baseSync.sync(messages[0])); // step 2
messages.push(so.cloneSync.sync(messages[1])); // step 3
should.deepEqual(messages[0], {
op: Synchronizer.OP_UPDB,
syncRev: syncRev1,
diff: {
b: 2,
}
});
should.deepEqual(messages[1], {
op: Synchronizer.OP_UPDC,
text: Synchronizer.TEXT_UPDC,
syncRev: messages[0].syncRev,
newRev: so.baseSync.baseRev,
diff: {
a: 11, // base change
d: 20, // base decoration
}
});
should.deepEqual(messages[2], {
op: Synchronizer.OP_OK,
text: Synchronizer.TEXT_SYNC,
syncRev: so.baseSync.baseRev,
});
should.deepEqual(so.cloneModel, so.baseModel);
should.deepEqual(so.cloneModel, {
a: 11,
b: 2,
d: 20,
});
});
it("3-step synchronization should slam base model over stale clone", function() {
var so = testScenario(true, true);
var syncRev1 = so.baseSync.baseRev;
so.baseModel.a = 11; // base change
so.baseSync.rebase(); // make clone stale
syncRev1.should.not.equal(so.baseSync.baseRev);
var messages = [];
messages.push(so.cloneSync.createSyncRequest()); // step 1
messages.push(so.baseSync.sync(messages[0])); // step 2
messages.push(so.cloneSync.sync(messages[1])); // step 3
should.deepEqual(messages[0], {
op: Synchronizer.OP_UPDB,
syncRev: syncRev1,
});
should.deepEqual(messages[1], {
op: Synchronizer.OP_STALE,
text: Synchronizer.TEXT_STALE,
newRev: so.baseSync.baseRev,
model: {
a: 11,
d: 20,
}
});
should.deepEqual(messages[2], {
op: Synchronizer.OP_OK,
text: Synchronizer.TEXT_CLONED,
syncRev: so.baseSync.baseRev,
});
should.deepEqual(so.baseModel, {
a: 11,
d: 20,
});
should.deepEqual(so.cloneModel, {
a: 11,
d: 20,
});
});
it("3-step synchronization of stale clone will be unfriendly to clone changes", function() {
var so = testScenario(true, true);
var syncRev1 = so.baseSync.baseRev;
so.baseModel.a = 11; // base change
so.baseSync.rebase(); // make clone stale
syncRev1.should.not.equal(so.baseSync.baseRev);
so.cloneModel.a = 10; // clone change
so.cloneModel.b = 2; // clone change
var messages = [];
messages.push(so.cloneSync.createSyncRequest()); // step 1
messages.push(so.baseSync.sync(messages[0])); // step 2
messages.push(so.cloneSync.sync(messages[1])); // step 3
should.deepEqual(messages[0], {
op: Synchronizer.OP_UPDB,
syncRev: syncRev1,
diff: {
a: 10,
b: 2,
}
});
should.deepEqual(messages[1], {
op: Synchronizer.OP_STALE,
text: Synchronizer.TEXT_STALE,
newRev: so.baseSync.baseRev,
model: {
a: 11,
d: 20,
}
});
should.deepEqual(messages[2], {
op: Synchronizer.OP_OK,
text: Synchronizer.TEXT_CLONED,
syncRev: so.baseSync.baseRev,
});
should.deepEqual(so.baseModel, {
a: 11,
d: 20,
});
// TODO: The following outcome is ugly
should.deepEqual(so.cloneModel, {
a: 11, // base value slammed over clone change (ugh)
b: 2, // orphaned clone value won't sync till changed (ugh)
d: 20,
});
});
it("constructor options can specify functions for beforeUpdate and afterUpdate", function() {
var before = 0;
var beforeDiff = 0;
var beforeUpdate = function(diff) {
before++;
diff && beforeDiff++;
}
var after = 0;
var afterDiff = 0;
var afterUpdate = function(diff) {
after++;
diff && afterDiff++;
}
var so = testScenario(false, false, false, beforeUpdate, afterUpdate);
should(typeof so.cloneSync.beforeUpdate).equal("function");
should(typeof so.cloneSync.afterUpdate).equal("function");
// Uninitialized
var messages = [];
messages.push(so.cloneSync.createSyncRequest()); // step 1
messages.push(so.baseSync.sync(messages[messages.length - 1])); // step 2
messages.push(so.cloneSync.sync(messages[messages.length - 1])); // step 3
messages[0].op.should.equal(Synchronizer.OP_CLONE);
messages[1].op.should.equal(Synchronizer.OP_RETRY);
messages[2].op.should.equal(Synchronizer.OP_RETRY);
before.should.equal(0);
after.should.equal(0);
// Clone
so.baseSync.rebase();
messages.push(so.cloneSync.createSyncRequest()); // step 1
messages.push(so.baseSync.sync(messages[messages.length - 1])); // step 2
messages.push(so.cloneSync.sync(messages[messages.length - 1])); // step 3
messages[3].op.should.equal(Synchronizer.OP_CLONE);
messages[4].op.should.equal(Synchronizer.OP_SYNC);
messages[5].op.should.equal(Synchronizer.OP_OK);
before.should.equal(1);
after.should.equal(1);
// Idle
messages.push(so.cloneSync.createSyncRequest()); // step 1
messages.push(so.baseSync.sync(messages[messages.length - 1])); // step 2
messages.push(so.cloneSync.sync(messages[messages.length - 1])); // step 3
messages[6].op.should.equal(Synchronizer.OP_UPDB);
messages[7].op.should.equal(Synchronizer.OP_IDLE);
messages[8].op.should.equal(Synchronizer.OP_IDLE);
before.should.equal(1);
after.should.equal(1);
// Clone changes
so.cloneModel.b = 2;
messages.push(so.cloneSync.createSyncRequest()); // step 1
so.cloneSync.idle.should.equal(false);
messages.push(so.baseSync.sync(messages[messages.length - 1])); // step 2
messages.push(so.cloneSync.sync(messages[messages.length - 1])); // step 3
messages[9].op.should.equal(Synchronizer.OP_UPDB);
messages[10].op.should.equal(Synchronizer.OP_UPDC);
should(messages[10].diff == null).True;
messages[11].op.should.equal(Synchronizer.OP_OK);
before.should.equal(2);
beforeDiff.should.equal(1);
after.should.equal(2);
afterDiff.should.equal(1);
// Base changes
so.baseModel.a = 11;
messages.push(so.cloneSync.createSyncRequest()); // step 1
messages.push(so.baseSync.sync(messages[messages.length - 1])); // step 2
messages.push(so.cloneSync.sync(messages[messages.length - 1])); // step 3
messages[12].op.should.equal(Synchronizer.OP_UPDB);
messages[13].op.should.equal(Synchronizer.OP_UPDC);