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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/defaults.h>
#include <thread>
#include <iostream>
#include <algorithm>
#include <dirent.h>
#include <unistd.h>
#include <cstring>
#include <sys/stat.h>
#include "application.h"
namespace {
std::string masterInbox() {
return vespa::Defaults::underVespaHome("var/spool/master/inbox");
}
std::string outboxParent() {
return vespa::Defaults::underVespaHome("var/spool/vespa");
}
}
namespace spoolmaster {
Application::Application()
: _masterInbox(masterInbox()),
_inboxFiles(),
_outboxParentDir(outboxParent()),
_outboxes()
{
// empty
}
Application::~Application()
{
// empty
}
bool
Application::scanInbox()
{
std::vector<std::string> rv;
DIR *d = opendir(_masterInbox.c_str());
if (d == NULL) {
perror(_masterInbox.c_str());
mkdir(_masterInbox.c_str(), 0775);
return false;
}
struct dirent *entry;
while ((entry = readdir(d)) != NULL) {
if (strcmp(entry->d_name, ".") == 0) continue;
if (strcmp(entry->d_name, "..") == 0) continue;
std::string fn = _masterInbox;
fn.append("/");
fn.append(entry->d_name);
struct stat sb;
if (stat(fn.c_str(), &sb) == 0) {
if (S_ISREG(sb.st_mode)) {
rv.push_back(fn);
}
} else {
perror(fn.c_str());
}
}
closedir(d);
if (access(_masterInbox.c_str(), W_OK) < 0) {
perror(_masterInbox.c_str());
return false;
}
_inboxFiles = rv;
return (rv.size() > 0);
}
bool
Application::findOutboxes()
{
std::vector<std::string> rv;
DIR *d = opendir(_outboxParentDir.c_str());
if (d == NULL) {
perror(_outboxParentDir.c_str());
return false;
}
struct dirent *entry;
while ((entry = readdir(d)) != NULL) {
if (strcmp(entry->d_name, ".") == 0) continue;
if (strcmp(entry->d_name, "..") == 0) continue;
/* XXX: should check if d_name starts with "colo." ? */
std::string fn = _outboxParentDir;
fn.append("/");
fn.append(entry->d_name);
fn.append("/inbox");
if (fn == _masterInbox) continue;
struct stat sb;
if (stat(fn.c_str(), &sb) == 0) {
if (S_ISDIR(sb.st_mode)) {
if (access(fn.c_str(), W_OK) < 0) {
std::cerr << "Cannot write to directory ";
perror(fn.c_str());
continue;
}
rv.push_back(fn);
}
} else {
perror(fn.c_str());
}
}
closedir(d);
if (rv.size() > 0) {
std::sort(rv.begin(), rv.end());
sviter_t ni = rv.begin();
sviter_t oi = _outboxes.begin();
while (ni != rv.end()) {
const std::string &newval = *ni;
if (oi == _outboxes.end()) {
std::cerr << "Found new slave inbox: " << newval << std::endl;
++ni;
continue;
}
const std::string &oldval = *oi;
if (newval == oldval) {
++ni;
++oi;
} else if (newval < oldval) {
std::cerr << "Found new slave inbox: " << newval << std::endl;
++ni;
} else /* oldval < newval */ {
std::cerr << "Slave inbox removed: " << oldval << std::endl;
++oi;
}
}
_outboxes = rv;
return true;
}
std::cerr << "Did not find any slave inboxes in: " << _outboxParentDir << std::endl;
return false;
}
void
Application::moveLinks()
{
for (sviter_t fni = _inboxFiles.begin(); fni != _inboxFiles.end(); ++fni) {
const std::string& filename = *fni;
size_t ldp = filename.rfind("/");
std::string basename = filename.substr(ldp+1);
for (sviter_t obi = _outboxes.begin(); obi != _outboxes.end(); ++obi) {
std::string newFn = *obi;
newFn.append("/");
newFn.append(basename);
std::cout << "linking " << filename << " -> " << newFn << std::endl;
if (link(filename.c_str(), newFn.c_str()) < 0) {
std::cerr << "linking " << filename << " -> " << newFn;
perror("failed");
return;
}
}
if (unlink(filename.c_str()) < 0) {
std::cerr << "cannot remove " << filename;
perror(", error");
}
}
}
int
Application::Main()
{
bool aborted = false;
findOutboxes();
try {
while (!aborted) {
if (scanInbox() && findOutboxes()) {
moveLinks();
} else {
std::this_thread::sleep_for(std::chrono::milliseconds(200));
}
}
}
catch(std::exception &e) {
fprintf(stderr, "ERROR: %s\n", e.what());
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
} // namespace spoolmaster
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