sync-client
Version:
Module which uses Dexie to save data and can later use a server to synchronize the data in the database with other devices
71 lines (69 loc) • 2.49 kB
JavaScript
/*
* Implementation of the ISyncProtocol
* https://github.com/dfahlander/Dexie.js/wiki/Dexie.Syncable.ISyncProtocol
*/
export default function initSync(serverComm, isOnline) {
return function sync(
context,
url,
options,
baseRevision,
syncedRevision,
changes,
partial,
applyRemoteChanges,
onChangesAccepted,
onSuccess,
onError
) {
const request = {
// Will not be defined the first time we call the server
clientIdentity: context.clientIdentity,
baseRevision,
partial,
changes,
syncedRevision,
};
serverComm(url, request, options)
.then((data) => {
if (!data.success) {
// Server didn't accept our changes. Stop trying to sync
onError(data.errorMessage, Infinity);
} else {
// If we have no clientIdentity yet, then this was the first call
// Make sure we save the clientIdentity and then schedule the next call
if (!context.clientIdentity) {
context.clientIdentity = data.clientIdentity;
context.save()
.then(() => {
applyRemoteChanges(data.changes, data.currentRevision, data.partial, false);
onChangesAccepted();
onSuccess({ again: options.pollInterval });
}).catch((e) => {
// We failed to save the clientIdentity. Stop trying to sync
// We would not be able to get/send any partial data
onError(e, Infinity);
});
// This is a subsequent call.
// We already have a clientIdentity so we can just schedule the next call
} else {
applyRemoteChanges(data.changes, data.currentRevision, data.partial, false);
onChangesAccepted();
onSuccess({ again: options.pollInterval });
}
}
})
.catch((e) => {
isOnline(url)
.then((status) => {
if (status) { // We were temporarily offline -> retry
onError(e, options.pollInterval);
} else { // Was probably not just a temp thing -> stop retrying
// Synable will automatically disconnect us with an ERROR
// and we will have to manually reconnect
onError(e, Infinity);
}
});
});
};
}