mapcomplete/Logic/Osm/Changes.ts

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/**
* Handles all changes made to OSM.
* Needs an authenticator via OsmConnection
*/
import {UIEventSource} from "../UIEventSource";
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import {OsmConnection} from "./OsmConnection";
import {OsmNode, OsmObject} from "./OsmObject";
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import {And, Tag, TagsFilter} from "../TagsFilter";
import {ElementStorage} from "../ElementStorage";
import {State} from "../../State";
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import {Utils} from "../../Utils";
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export class Changes {
private static _nextId = -1; // New assined ID's are negative
private _pendingChanges: { elementId: string, key: string, value: string }[] = []; // Gets reset on uploadAll
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private newElements: OsmObject[] = []; // Gets reset on uploadAll
public readonly pendingChangesES = new UIEventSource<number>(this._pendingChanges.length);
public readonly isSaving = new UIEventSource(false);
constructor(
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state: State) {
this.SetupAutoSave(state);
this.LastEffortSave();
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}
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addTag(elementId: string, tagsFilter : TagsFilter){
if(tagsFilter instanceof Tag){
const tag = tagsFilter as Tag;
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if(typeof tag.value !== "string"){
throw "Invalid value"
}
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this.addChange(elementId, tag.key, tag.value);
return;
}
if(tagsFilter instanceof And){
const and = tagsFilter as And;
for (const tag of and.and) {
this.addTag(elementId, tag);
}
return;
}
console.log("Unsupported tagsfilter element to addTag", tagsFilter);
throw "Unsupported tagsFilter element";
}
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/**
* Adds a change to the pending changes
* @param elementId
* @param key
* @param value
*/
addChange(elementId: string, key: string, value: string) {
if (key === undefined || key === null) {
console.log("Invalid key");
return;
}
if (value === undefined || value === null) {
console.log("Invalid value for ",key);
return;
}
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if(key.startsWith(" ") || value.startsWith(" ") || value.endsWith(" ") || key.endsWith(" ")){
console.warn("Tag starts with or ends with a space - trimming anyway")
}
key = key.trim();
value = value.trim();
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const eventSource = State.state.allElements.getElement(elementId);
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eventSource.data[key] = value;
if(value === undefined || value === ""){
delete eventSource.data[key];
}
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eventSource.ping();
// We get the id from the event source, as that ID might be rewritten
this._pendingChanges.push({elementId: eventSource.data.id, key: key, value: value});
this.pendingChangesES.setData(this._pendingChanges.length);
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}
/**
* Create a new node element at the given lat/long.
* An internal OsmObject is created to upload later on, a geojson represention is returned.
* Note that the geojson version shares the tags (properties) by pointer, but has _no_ id in properties
*/
createElement(basicTags:Tag[], lat: number, lon: number) {
console.log("Creating a new element with ", basicTags)
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const osmNode = new OsmNode(Changes._nextId);
this.newElements.push(osmNode);
Changes._nextId--;
const id = "node/" + osmNode.id;
osmNode.lat = lat;
osmNode.lon = lon;
const properties = {id: id};
const geojson = {
"type": "Feature",
"properties": properties,
"id": id,
"geometry": {
"type": "Point",
"coordinates": [
lon,
lat
]
}
}
// The basictags are COPIED, the id is included in the properties
// The tags are not yet written into the OsmObject, but this is applied onto a
for (const kv of basicTags) {
properties[kv.key] = kv.value;
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if(typeof kv.value !== "string"){
throw "Invalid value"
}
this._pendingChanges.push({elementId: id, key: kv.key, value: kv.value});
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}
this.pendingChangesES.setData(this._pendingChanges.length);
State.state.allElements.addOrGetElement(geojson).ping();
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return geojson;
}
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public uploadAll(optionalContinuation: (() => void) = undefined) {
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const self = this;
this.isSaving.setData(true);
const optionalContinuationWrapped = function () {
self.isSaving.setData(false);
if (optionalContinuation) {
optionalContinuation();
}
}
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const pending: { elementId: string; key: string; value: string }[] = this._pendingChanges;
this._pendingChanges = [];
this.pendingChangesES.setData(this._pendingChanges.length);
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const newElements = this.newElements;
this.newElements = [];
const knownElements = {}; // maps string --> OsmObject
function DownloadAndContinue(neededIds, continuation: (() => void)) {
// local function which downloads all the objects one by one
// this is one big loop, running one download, then rerunning the entire function
if (neededIds.length == 0) {
continuation();
return;
}
const neededId = neededIds.pop();
if (neededId in knownElements) {
DownloadAndContinue(neededIds, continuation);
return;
}
console.log("Downloading ", neededId);
OsmObject.DownloadObject(neededId,
function (element) {
knownElements[neededId] = element; // assign the element for later, continue downloading the next element
DownloadAndContinue(neededIds, continuation);
}
);
}
const neededIds = [];
for (const change of pending) {
const id = change.elementId;
if (parseFloat(id.split("/")[1]) < 0) {
console.log("Detected a new element! Exciting!")
} else {
neededIds.push(id);
}
}
DownloadAndContinue(neededIds, function () {
// Here, inside the continuation, we know that all 'neededIds' are loaded in 'knownElements'
// We apply the changes on them
for (const change of pending) {
if (parseInt(change.elementId.split("/")[1]) < 0) {
// This is a new element - we should apply this on one of the new elements
for (const newElement of newElements) {
if (newElement.type + "/" + newElement.id === change.elementId) {
newElement.addTag(change.key, change.value);
}
}
} else {
console.log(knownElements, change.elementId);
knownElements[change.elementId].addTag(change.key, change.value);
// note: addTag will flag changes with 'element.changed' internally
}
}
// Small sanity check for duplicate information
let changedElements = [];
for (const elementId in knownElements) {
const element = knownElements[elementId];
if (element.changed) {
changedElements.push(element);
}
}
if (changedElements.length == 0 && newElements.length == 0) {
console.log("No changes in any object");
return;
}
const handleMapping = function (idMapping) {
for (const oldId in idMapping) {
const newId = idMapping[oldId];
const element = State.state.allElements.getElement(oldId);
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element.data.id = newId;
State.state.allElements.addElementById(newId, element);
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element.ping();
}
}
console.log("Beginning upload...");
// At last, we build the changeset and upload
State.state.osmConnection.UploadChangeset(
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function (csId) {
let modifications = "";
for (const element of changedElements) {
if (!element.changed) {
continue;
}
modifications += element.ChangesetXML(csId) + "\n";
}
let creations = "";
for (const newElement of newElements) {
creations += newElement.ChangesetXML(csId);
}
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let changes = `<osmChange version='0.6' generator='Mapcomplete ${State.vNumber}'>`;
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if (creations.length > 0) {
changes +=
"<create>" +
creations +
"</create>";
}
if (modifications.length > 0) {
changes +=
"<modify>" +
modifications +
"</modify>";
}
changes += "</osmChange>";
return changes;
},
handleMapping,
optionalContinuationWrapped);
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});
}
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/*
* Registers an action that:
* -> Upload everything to OSM
* -> Asks the user not to close. The 'not to close' dialog should profide enough time to upload
* -> WHen uploading is done, the window is closed anyway
*/
private LastEffortSave() {
const self = this;
window.addEventListener("beforeunload", function (e) {
// Quickly save everyting!
if (self.pendingChangesES.data == 0) {
return "";
}
self.uploadAll(function () {
console.log("Uploaded changes during a last-effort save")
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window.close()
});
var confirmationMessage = "Nog even geduld - je laatset wijzigingen worden opgeslaan!";
(e || window.event).returnValue = confirmationMessage; //Gecko + IE
return confirmationMessage; //Webkit, Safari, Chrome
});
document.addEventListener('visibilitychange', () => {
if (document.visibilityState === "visible") {
return;
}
if (this.pendingChangesES.data == 0) {
return;
}
console.log("Uploading: loss of focus")
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this.uploadAll(function () {
console.log("Uploaded changes during a last-effort save (loss of focus)")
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window.close()
});
})
}
private SetupAutoSave(state: State) {
const millisTillChangesAreSaved = state.secondsTillChangesAreSaved;
const saveAfterXMillis = state.saveTimeout.data;
const self = this;
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this.pendingChangesES.addCallback(function () {
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var c = self.pendingChangesES.data;
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if (c > 10) {
millisTillChangesAreSaved.setData(0);
self.uploadAll(() => {
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console.log("Uploaded changes: more then 10 pending changes")
});
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return;
}
if (c > 0) {
millisTillChangesAreSaved.setData(saveAfterXMillis);
}
});
millisTillChangesAreSaved.addCallback((time) => {
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if (time <= 0 && self.pendingChangesES.data > 0) {
self.uploadAll(() => {
console.log("Saving changes: timer elapsed")
});
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}
}
)
Utils.DoEvery(
1000,
() => {
millisTillChangesAreSaved
.setData(millisTillChangesAreSaved.data - 1000)
});
}
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}