// handle a scheduler request:
//
// - handle completed uploads
// - handle set of files present on client
// (update or create VDA_CHUNK_HOST record)
// - handle files expected but not present
// - issue delete commands if needed to enforce share
// - issue upload or download commands to client
//
// relevant fields of SCHEDULER_REQUEST
// file_infos: list of sticky files
// file_xfer_results: list of completed file xfers
//
void handle_vda() {
int retval;
unsigned int i;
CHUNK_LIST chunks;
// chunks that are supposed to be on this host
// if client is outdated, mark as dead
//
if (outdated_client(g_reply->host)) {
g_reply->host.cpu_efficiency = 1;
return;
}
// otherwise mark it as alive
//
g_reply->host.cpu_efficiency = 0;
// enumerate the vda_chunk_host records for this host from DB
//
DB_VDA_CHUNK_HOST ch;
char buf[256];
sprintf(buf, "where host_id=%d", g_reply->host.id);
while (1) {
retval = ch.enumerate(buf);
if (retval == ERR_DB_NOT_FOUND) break;
if (retval) {
// if we didn't get a complete enumeration,
// give up rather than continuing with partial info
//
log_messages.printf(MSG_NORMAL,
"[vda]: ch.enumerate() failed %d\n", retval
);
return;
}
if (config.debug_vda) {
log_messages.printf(MSG_NORMAL,
"[vda] DB: has chunk %s, file %d\n",
ch.physical_file_name, ch.vda_file_id
);
}
chunks.insert(
pair<string, DB_VDA_CHUNK_HOST>(string(ch.physical_file_name), ch)
);
}
// process completed uploads
// (completed downloads are handled below)
//
for (i=0; i<g_request->file_xfer_results.size(); i++) {
RESULT& r = g_request->file_xfer_results[i];
if (strstr(r.name, "upload_vda_")) {
char* phys_file_name = r.name + strlen("upload_");
if (config.debug_vda) {
log_messages.printf(MSG_NORMAL,
"[vda] completed upload of %s\n", phys_file_name
);
}
retval = process_completed_upload(phys_file_name, chunks);
if (retval) {
log_messages.printf(MSG_CRITICAL,
"[vda] process_completed_upload(): %d\n", retval
);
return;
}
}
}
// process files present on client
//
for (i=0; i<g_request->file_infos.size(); i++) {
FILE_INFO& fi = g_request->file_infos[i];
if (!starts_with(fi.name, "vda_")) {
continue;
}
if (config.debug_vda) {
log_messages.printf(MSG_NORMAL,
"[vda] request: client has file %s, status %d\n",
fi.name, fi.status
);
}
if (fi.status != FILE_PRESENT) {
continue;
}
process_chunk_present_on_client(fi, chunks);
}
process_chunks_missing_on_client(chunks);
enforce_quota(chunks);
issue_transfer_commands(chunks);
}
// handle a scheduler request:
//
// - handle completed uploads
// - handle set of files present on client
// (update or create VDA_CHUNK_HOST record)
// - handle files expected but not present
// - issue delete commands if needed to enforce share
// - issue upload or download commands to client
//
// relevant fields of SCHEDULER_REQUEST
// file_infos: list of sticky files
// file_xfer_results: list of completed file xfers
//
void handle_vda() {
int retval;
unsigned int i;
CHUNK_LIST chunks;
// chunks that are supposed to be on this host
// enumerate the vda_chunk_host records for this host from DB
//
DB_VDA_CHUNK_HOST ch;
char buf[256];
sprintf(buf, "where host_id=%d", g_reply->host.id);
while (1) {
retval = ch.enumerate(buf);
if (retval == ERR_DB_NOT_FOUND) break;
if (retval) {
// if we didn't get a complete enumeration,
// give up rather than continuing with partial info
//
log_messages.printf(MSG_NORMAL,
"[vda]: ch.enumerate() failed %d\n", retval
);
return;
}
if (config.debug_vda) {
log_messages.printf(MSG_NORMAL,
"[vda] DB: has chunk %s\n", ch.name
);
}
chunks.insert(pair<string, DB_VDA_CHUNK_HOST>(string(ch.name), ch));
}
// process completed uploads
//
for (i=0; i<g_request->file_xfer_results.size(); i++) {
RESULT& r = g_request->file_xfer_results[i];
if (!starts_with(r.name, "vda_upload_")) continue;
char* chunk_name = r.name + strlen("vda_upload_");
if (config.debug_vda) {
log_messages.printf(MSG_NORMAL,
"[vda] DB: completed upload %s\n", chunk_name
);
}
retval = process_completed_upload(chunk_name, chunks);
if (retval) {
log_messages.printf(MSG_CRITICAL,
"[vda] process_completed_upload(): %d\n", retval
);
return;
}
}
// process files present on host
//
for (i=0; i<g_request->file_infos.size(); i++) {
FILE_INFO& fi = g_request->file_infos[i];
if (!starts_with(fi.name, "vda_")) {
continue;
}
if (config.debug_vda) {
log_messages.printf(MSG_NORMAL,
"[vda] request: client has file %s\n", fi.name
);
}
process_present_file(fi, chunks);
}
process_missing_chunks(chunks);
enforce_quota(chunks);
issue_transfer_commands(chunks);
}