private void doFetch(HttpServletRequest req, HttpServletResponse resp)
throws IOException, ServletException {
String fetchUrl = getRequired(req, "dir");
String storeName = getRequired(req, "store");
String pushVersionString = getOptional(req, "pushVersion");
ReadOnlyStorageEngine store = this.getStore(storeName);
if (store == null)
throw new ServletException("'" + storeName + "' is not a registered read-only store.");
long pushVersion;
if (pushVersionString == null) {
pushVersion = store.getCurrentVersionId() + 1;
} else {
pushVersion = Long.parseLong(pushVersionString);
if (pushVersion <= store.getCurrentVersionId())
throw new ServletException(
"Version of push specified ("
+ pushVersion
+ ") should be greater than current version "
+ store.getCurrentVersionId());
}
// fetch the files if necessary
File fetchDir = null;
if (fileFetcher == null) {
logger.warn("File fetcher class has not instantiated correctly");
fetchDir = new File(fetchUrl);
} else {
logger.info("Executing fetch of " + fetchUrl);
try {
fetchDir =
fileFetcher.fetch(
fetchUrl, store.getStoreDirPath() + File.separator + "version-" + pushVersion);
if (fetchDir == null) {
throw new ServletException(
"File fetcher failed for "
+ fetchUrl
+ " and store name = "
+ storeName
+ " due to incorrect input path/checksum error");
} else {
logger.info("Fetch complete.");
}
} catch (Exception e) {
throw new ServletException("Exception in Fetcher = " + e.getMessage());
}
}
resp.getWriter().write(fetchDir.getAbsolutePath());
}
private void doRollback(HttpServletRequest req) throws ServletException {
String storeName = getRequired(req, "store");
long pushVersion = Long.parseLong(getRequired(req, "pushVersion"));
ReadOnlyStorageEngine store = getStore(storeName);
if (store == null)
throw new ServletException("'" + storeName + "' is not a registered read-only store.");
try {
File rollbackVersionDir = new File(store.getStoreDirPath(), "version-" + pushVersion);
store.rollback(rollbackVersionDir);
} catch (Exception e) {
throw new ServletException("Exception in Fetcher = " + e.getMessage());
}
}
