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boinc/client/scheduler_op.C

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// The contents of this file are subject to the Mozilla Public License
// Version 1.0 (the "License"); you may not use this file except in
// compliance with the License. You may obtain a copy of the License at
// http://www.mozilla.org/MPL/
//
// Software distributed under the License is distributed on an "AS IS"
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
// License for the specific language governing rights and limitations
// under the License.
//
// The Original Code is the Berkeley Open Infrastructure for Network Computing.
//
// The Initial Developer of the Original Code is the SETI@home project.
// Portions created by the SETI@home project are Copyright (C) 2002
// University of California at Berkeley. All Rights Reserved.
//
// Contributor(s):
//
#include <math.h>
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include "util.h"
#include "parse.h"
#include "error_numbers.h"
#include "client_state.h"
#include "client_types.h"
#include "file_names.h"
#include "log_flags.h"
#include "scheduler_op.h"
SCHEDULER_OP::SCHEDULER_OP(HTTP_OP_SET* h) {
state = SCHEDULER_OP_STATE_IDLE;
http_op.http_op_state = HTTP_STATE_IDLE;
http_ops = h;
}
// try to get enough work to bring us up to high-water mark
//
int SCHEDULER_OP::init_get_work() {
int retval;
char err_msg[256];
double ns = gstate.work_needed_secs();
must_get_work = true;
project = gstate.next_project(0);
if (project) {
retval = init_op_project(ns);
if (retval) {
sprintf(err_msg, "init_get_work failed, error %d\n", retval);
backoff(project, err_msg);
return retval;
}
} else {
project = gstate.next_project_master_pending();
if (project) {
retval = init_master_fetch(project);
if (retval) {
sprintf(err_msg, "init_master_fetch failed, error %d\n", retval);
backoff(project, err_msg);
}
}
}
return 0;
}
// report results for a particular project.
// also get work from that project if below high-water mark
//
int SCHEDULER_OP::init_return_results(PROJECT* p, double ns) {
must_get_work = false;
project = p;
return init_op_project(ns);
}
// try to initiate an RPC to the current project.
// If there are multiple schedulers, start with the first one
//
int SCHEDULER_OP::init_op_project(double ns) {
int retval;
char err_msg[256];
if (log_flags.sched_op_debug) {
printf("init_op_project: starting op for %s\n", project->master_url);
}
// if project has no schedulers, skip everything else
// and just get its master file.
//
url_index = 0;
if (project->scheduler_urls.size() == 0) {
retval = init_master_fetch(project);
goto done;
}
retval = gstate.make_scheduler_request(project, ns);
if (retval) {
fprintf(stderr, "make_scheduler_request: %d\n", retval);
goto done;
}
retval = start_rpc();
done:
if (retval) {
sprintf(err_msg,
"scheduler init_op_project to %s failed, error %d\n",
project->scheduler_urls[url_index].text, retval
);
backoff(project, err_msg);
}
return retval;
}
// Set a project's min RPC time to something in the future,
// based on exponential backoff
// TODO: integrate with other backoff sources
//
int SCHEDULER_OP::set_min_rpc_time(PROJECT* p) {
double x;
int exp_backoff;
int n = p->nrpc_failures;
if (n > RETRY_CAP) n = RETRY_CAP;
// we've hit the limit on master_url fetches
//
if (p->master_fetch_failures >= MASTER_FETCH_RETRY_CAP) {
if (log_flags.sched_op_debug) {
printf("we've hit the limit on master_url fetches\n");
}
x = exp(drand()*p->master_fetch_failures);
exp_backoff = (int) min((int)x,MASTER_FETCH_INTERVAL);
} else {
x = RETRY_BASE_PERIOD * exp(drand() * n);
exp_backoff = (int)max(SCHED_RETRY_DELAY_MIN,min(SCHED_RETRY_DELAY_MAX,(int) x));
}
p->min_rpc_time = time(0) + exp_backoff;
if (log_flags.sched_op_debug) {
printf(
"setting min RPC time for %s to %d seconds from now\n",
p->master_url, exp_backoff
);
}
return 0;
}
// Back off on the scheduler and output an error msg if needed
//
int SCHEDULER_OP::backoff( PROJECT* p, char *error_msg ) {
if (log_flags.sched_op_debug) {
printf(error_msg);
}
if (p->master_fetch_failures >= MASTER_FETCH_RETRY_CAP) {
p->master_url_fetch_pending = true;
set_min_rpc_time(p);
return 0;
}
// if nrpc failures a multiple of master_fetch_period,
// then set master_url_fetch_pending and initialize again
//
if (p->nrpc_failures == MASTER_FETCH_PERIOD) {
p->master_url_fetch_pending = true;
p->min_rpc_time = 0;
p->nrpc_failures = 0;
p->master_fetch_failures++;
}
p->nrpc_failures++;
set_min_rpc_time(p);
return 0;
}
// low-level routine to initiate an RPC
// If successful, creates an HTTP_OP that must be polled
//
int SCHEDULER_OP::start_rpc() {
FILE *f;
int retval;
strcpy(scheduler_url, project->scheduler_urls[url_index].text);
if (log_flags.sched_ops) {
printf("Sending request to scheduler: %s\n", scheduler_url);
}
if (log_flags.sched_op_debug) {
f = fopen(SCHED_OP_REQUEST_FILE, "r");
printf("--------- SCHEDULER REQUEST ---------\n");
copy_stream(f, stdout);
printf("--------- END ---------\n");
fclose(f);
}
if (gstate.use_http_proxy) {
http_op.use_http_proxy = true;
strcpy(http_op.proxy_server_name, gstate.proxy_server_name);
http_op.proxy_server_port = gstate.proxy_server_port;
}
retval = http_op.init_post(
scheduler_url, SCHED_OP_REQUEST_FILE,
SCHED_OP_RESULT_FILE
);
if (retval) return retval;
retval = http_ops->insert(&http_op);
if (retval) return retval;
project->rpc_seqno++;
state = SCHEDULER_OP_STATE_RPC;
return 0;
}
// initiate a fetch of a project's master URL file
//
int SCHEDULER_OP::init_master_fetch(PROJECT* p) {
int retval;
project = p;
if (log_flags.sched_op_debug) {
printf("Fetching master file for %s\n", project->master_url);
}
if (gstate.use_http_proxy) {
http_op.use_http_proxy = true;
strcpy(http_op.proxy_server_name, gstate.proxy_server_name);
http_op.proxy_server_port = gstate.proxy_server_port;
}
retval = http_op.init_get(project->master_url, MASTER_FILE_NAME, true);
if (retval) return retval;
retval = http_ops->insert(&http_op);
if (retval) return retval;
state = SCHEDULER_OP_STATE_GET_MASTER;
return 0;
}
// parse a master file.
//
int SCHEDULER_OP::parse_master_file(vector<STRING256> &urls) {
char buf[256];
STRING256 str;
FILE* f;
f = fopen(MASTER_FILE_NAME, "r");
if (!f) {
fprintf(stderr, "Can't open master file\n");
return ERR_FOPEN;
}
project->scheduler_urls.clear();
while (fgets(buf, 256, f)) {
if (parse_str(buf, "<scheduler>", str.text, sizeof(str.text))) {
urls.push_back(str);
}
}
fclose(f);
if (log_flags.sched_op_debug) {
printf("Parsed master file; got %d scheduler URLs\n", (int)urls.size());
}
// couldn't find any urls in the master file?
//
if ((int) urls.size() == 0) {
return -1;
}
return 0;
}
// A master file has just been read.
// transfer scheduler urls to project.
// Return true if any of them is new
//
bool SCHEDULER_OP::update_urls(PROJECT& project, vector<STRING256> &urls) {
unsigned int i, j;
bool found, any_new;
any_new = false;
for (i=0; i<urls.size(); i++) {
found = false;
for (j=0; j<project.scheduler_urls.size(); j++) {
if (!strcmp(urls[i].text, project.scheduler_urls[i].text)) {
found = true;
break;
}
}
if (!found) any_new = true;
}
project.scheduler_urls.clear();
for (i=0; i<urls.size(); i++) {
project.scheduler_urls.push_back(urls[i]);
}
return any_new;
}
// poll routine. If an operation is in progress, check for completion
//
bool SCHEDULER_OP::poll() {
int retval, nresults;
vector<STRING256> urls;
bool changed, scheduler_op_done;
bool action = false;
char err_msg[256],*err_url;
switch(state) {
case SCHEDULER_OP_STATE_GET_MASTER:
// here we're fetching the master file for a project
//
if (http_op.http_op_state == HTTP_STATE_DONE) {
action = true;
project->master_url_fetch_pending = false;
http_ops->remove(&http_op);
if (http_op.http_op_retval == 0) {
if (log_flags.sched_op_debug) {
printf(
"Got master file from %s; parsing\n",
project->master_url
);
}
retval = parse_master_file(urls);
if (retval) {
// master file parse failed.
//
project->master_fetch_failures++;
backoff(project, "Master file parse failed\n");
err_url = project->master_url;
} else {
// everything succeeded. Clear error counters
//
changed = update_urls(*project, urls);
if (changed) {
project->min_rpc_time = 0;
project->nrpc_failures = 0;
project->master_fetch_failures = 0;
}
}
} else {
// master file fetch failed.
//
project->master_fetch_failures++;
backoff(project, "Master file fetch failed\n");
err_url = project->master_url;
}
// If don't have any schedulers for this project,
// it may be the wrong URL. notify the user
//
if (project->scheduler_urls.size() == 0) {
sprintf(err_msg,
"Could not contact %s. Make sure this is the correct project URL.",
err_url
);
show_message(err_msg, "high");
project->master_fetch_failures++;
backoff(project, err_msg);
}
// See if need to read master file for another project
//
project = gstate.next_project_master_pending();
if (project) {
retval = init_master_fetch(project);
if (retval) {
project->master_fetch_failures++;
backoff(project, "Master file fetch failed\n");
err_url = project->master_url;
}
} else {
state = SCHEDULER_OP_STATE_IDLE;
if (log_flags.sched_op_debug) {
printf("Scheduler_op: return to idle state\n");
}
}
}
break;
case SCHEDULER_OP_STATE_RPC:
// here we're doing a scheduler RPC
//
scheduler_op_done = false;
if (http_op.http_op_state == HTTP_STATE_DONE) {
action = true;
http_ops->remove(&http_op);
if (http_op.http_op_retval) {
if (log_flags.sched_op_debug) {
printf(
"scheduler RPC to %s failed\n",
project->scheduler_urls[url_index].text
);
}
// scheduler RPC failed. Try another scheduler if one exists
//
url_index++;
if (url_index < project->scheduler_urls.size()) {
start_rpc();
} else {
backoff(project, "No schedulers responded");
if (must_get_work) {
project = gstate.next_project(project);
if (project) {
retval = init_op_project(gstate.work_needed_secs());
} else {
scheduler_op_done = true;
}
}
else {
scheduler_op_done = true;
}
}
} else {
if (log_flags.sched_op_debug) {
printf(
"scheduler RPC to %s succeeded\n",
project->scheduler_urls[url_index].text
);
}
gstate.handle_scheduler_reply(project, scheduler_url, nresults);
// if we asked for work and didn't get any,
// back off this project
//
if (must_get_work && nresults==0) {
backoff(project, "No work from project\n");
} else {
project->nrpc_failures = 0;
project->min_rpc_time = 0;
}
// if we didn't get all the work we needed,
// ask another project for work
//
if (must_get_work) {
double x = gstate.work_needed_secs();
if (x > 0) {
project = gstate.next_project(project);
if (project) {
retval = init_op_project(x);
} else {
scheduler_op_done = true;
}
} else {
scheduler_op_done = true;
}
} else {
scheduler_op_done = true;
}
}
}
// If no outstanding ops, see if need a master fetch
//
if (scheduler_op_done) {
project = gstate.next_project_master_pending();
if (project) {
retval = init_master_fetch(project);
if (retval) {
if (log_flags.sched_op_debug) {
printf("Scheduler op: init_master_fetch failed.\n" );
}
backoff(project, "Scheduler op: init_master_fetch failed.\n" );
}
} else {
state = SCHEDULER_OP_STATE_IDLE;
if (log_flags.sched_op_debug) {
printf("Scheduler_op: return to idle state\n");
}
}
}
break;
default:
break;
}
return action;
}
SCHEDULER_REPLY::SCHEDULER_REPLY() {
global_prefs_xml = 0;
project_prefs_xml = 0;
code_sign_key = 0;
code_sign_key_signature = 0;
}
SCHEDULER_REPLY::~SCHEDULER_REPLY() {
if (global_prefs_xml) free(global_prefs_xml);
if (project_prefs_xml) free(project_prefs_xml);
if (code_sign_key) free(code_sign_key);
if (code_sign_key_signature) free(code_sign_key_signature);
}
int SCHEDULER_REPLY::parse(FILE* in) {
char buf[256], *p;
int retval;
strcpy(message, "");
strcpy(message_priority, "");
request_delay = 0;
hostid = 0;
global_prefs_xml = 0;
project_prefs_xml = 0;
code_sign_key = 0;
code_sign_key_signature = 0;
p = fgets(buf, 256, in);
if (!p) {
fprintf(stderr, "SCHEDULER_REPLY::parse(): empty file\n");
return ERR_XML_PARSE;
}
// First part of content should either be tag (HTTP 1.0) or
// hex length of response (HTTP 1.1)
if (!match_tag(buf, "<scheduler_reply>")) {
fprintf(stderr, "SCHEDULER_REPLY::parse(): bad first tag %s\n", buf);
return ERR_XML_PARSE;
}
while (fgets(buf, 256, in)) {
if (match_tag(buf, "<scheduler_reply>")) {
// Do nothing
} else if (match_tag(buf, "</scheduler_reply>")) return 0;
else if (parse_str(buf, "<project_name>", project_name, sizeof(project_name))) continue;
else if (parse_str(buf, "<user_name>", user_name, sizeof(user_name))) continue;
else if (parse_double(buf, "<user_total_credit>", user_total_credit)) continue;
else if (parse_double(buf, "<user_expavg_credit>", user_expavg_credit)) continue;
else if (parse_int(buf, "<user_create_time>", (int &)user_create_time)) continue;
else if (parse_int(buf, "<hostid>", hostid)) continue;
else if (parse_double(buf, "<host_total_credit>", host_total_credit)) continue;
else if (parse_double(buf, "<host_expavg_credit>", host_expavg_credit)) continue;
else if (parse_int(buf, "<host_create_time>", (int &)host_create_time)) continue;
else if (parse_int(buf, "<request_delay>", request_delay)) continue;
else if (match_tag(buf, "<global_preferences>")) {
retval = dup_element_contents(
in,
"</global_preferences>",
&global_prefs_xml
);
if (retval) return ERR_XML_PARSE;
} else if (match_tag(buf, "<project_preferences>")) {
retval = dup_element_contents(
in,
"</project_preferences>",
&project_prefs_xml
);
if (retval) return ERR_XML_PARSE;
} else if (match_tag(buf, "<code_sign_key>")) {
retval = dup_element_contents(
in,
"</code_sign_key>",
&code_sign_key
);
if (retval) {
fprintf(stderr, "error: SCHEDULER_REPLY.parse: xml parsing error\n");
return ERR_XML_PARSE;
}
} else if (match_tag(buf, "<code_sign_key_signature>")) {
retval = dup_element_contents(
in,
"</code_sign_key_signature>",
&code_sign_key_signature
);
if (retval) return ERR_XML_PARSE;
} else if (match_tag(buf, "<app>")) {
APP app;
app.parse(in);
apps.push_back(app);
} else if (match_tag(buf, "<file_info>")) {
FILE_INFO file_info;
file_info.parse(in, true);
file_infos.push_back(file_info);
} else if (match_tag(buf, "<app_version>")) {
APP_VERSION av;
av.parse(in);
app_versions.push_back(av);
} else if (match_tag(buf, "<workunit>")) {
WORKUNIT wu;
wu.parse(in);
workunits.push_back(wu);
} else if (match_tag(buf, "<result>")) {
RESULT result; // make sure this is here so constructor
// gets called each time
result.parse_server(in);
results.push_back(result);
} else if (match_tag(buf, "<result_ack>")) {
RESULT result;
result.parse_ack(in);
result_acks.push_back(result);
} else if (parse_str(buf, "<message", message, sizeof(message))) {
parse_attr(buf, "priority", message_priority, sizeof(message_priority));
continue;
} else {
fprintf(stderr, "SCHEDULER_REPLY::parse: unrecognized %s\n", buf);
}
}
fprintf(stderr, "SCHEDULER_REPLY::parse: no close tag\n");
return ERR_XML_PARSE;
}
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