lighttpd 1.4.x https://www.lighttpd.net/
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lighttpd1.4/src/mod_rrdtool.c

448 lines
10 KiB

#define _GNU_SOURCE
#include <sys/types.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <time.h>
#include "server.h"
#include "connections.h"
#include "response.h"
#include "connections.h"
#include "log.h"
#include "plugin.h"
#ifdef HAVE_FORK
/* no need for waitpid if we don't have fork */
#include <sys/wait.h>
#endif
typedef struct {
buffer *path_rrdtool_bin;
buffer *path_rrd;
double requests, *requests_ptr;
double bytes_written, *bytes_written_ptr;
double bytes_read, *bytes_read_ptr;
} plugin_config;
typedef struct {
PLUGIN_DATA;
buffer *cmd;
buffer *resp;
int read_fd, write_fd;
pid_t rrdtool_pid;
int rrdtool_running;
plugin_config **config_storage;
plugin_config conf;
} plugin_data;
INIT_FUNC(mod_rrd_init) {
plugin_data *p;
p = calloc(1, sizeof(*p));
p->resp = buffer_init();
p->cmd = buffer_init();
return p;
}
FREE_FUNC(mod_rrd_free) {
plugin_data *p = p_d;
size_t i;
if (!p) return HANDLER_GO_ON;
if (p->config_storage) {
for (i = 0; i < srv->config_context->used; i++) {
plugin_config *s = p->config_storage[i];
buffer_free(s->path_rrdtool_bin);
buffer_free(s->path_rrd);
free(s);
}
}
buffer_free(p->cmd);
buffer_free(p->resp);
free(p->config_storage);
if (p->rrdtool_pid) {
int status;
close(p->read_fd);
close(p->write_fd);
#ifdef HAVE_FORK
/* collect status */
waitpid(p->rrdtool_pid, &status, 0);
#endif
}
free(p);
return HANDLER_GO_ON;
}
int mod_rrd_create_pipe(server *srv, plugin_data *p) {
pid_t pid;
int to_rrdtool_fds[2];
int from_rrdtool_fds[2];
#ifdef HAVE_FORK
if (pipe(to_rrdtool_fds)) {
log_error_write(srv, __FILE__, __LINE__, "ss",
"pipe failed: ", strerror(errno));
return -1;
}
if (pipe(from_rrdtool_fds)) {
log_error_write(srv, __FILE__, __LINE__, "ss",
"pipe failed: ", strerror(errno));
return -1;
}
/* fork, execve */
switch (pid = fork()) {
case 0: {
/* child */
char **args;
int argc;
int i = 0;
char *dash = "-";
/* move stdout to from_rrdtool_fd[1] */
close(STDOUT_FILENO);
dup2(from_rrdtool_fds[1], STDOUT_FILENO);
close(from_rrdtool_fds[1]);
/* not needed */
close(from_rrdtool_fds[0]);
/* move the stdin to to_rrdtool_fd[0] */
close(STDIN_FILENO);
dup2(to_rrdtool_fds[0], STDIN_FILENO);
close(to_rrdtool_fds[0]);
/* not needed */
close(to_rrdtool_fds[1]);
close(STDERR_FILENO);
if (srv->errorlog_mode == ERRORLOG_FILE) {
dup2(srv->errorlog_fd, STDERR_FILENO);
close(srv->errorlog_fd);
}
/* set up args */
argc = 3;
args = malloc(sizeof(*args) * argc);
i = 0;
args[i++] = p->conf.path_rrdtool_bin->ptr;
args[i++] = dash;
args[i++] = NULL;
/* we don't need the client socket */
for (i = 3; i < 256; i++) {
close(i);
}
/* exec the cgi */
execv(args[0], args);
log_error_write(srv, __FILE__, __LINE__, "sss", "spawing rrdtool failed: ", strerror(errno), args[0]);
/* */
SEGFAULT();
break;
}
case -1:
/* error */
log_error_write(srv, __FILE__, __LINE__, "ss", "fork failed: ", strerror(errno));
break;
default: {
/* father */
close(from_rrdtool_fds[1]);
close(to_rrdtool_fds[0]);
/* register PID and wait for them asyncronously */
p->write_fd = to_rrdtool_fds[1];
p->read_fd = from_rrdtool_fds[0];
p->rrdtool_pid = pid;
break;
}
}
return 0;
#else
return -1;
#endif
}
static int mod_rrdtool_create_rrd(server *srv, plugin_data *p, plugin_config *s) {
struct stat st;
/* check if DB already exists */
if (0 == stat(s->path_rrd->ptr, &st)) {
/* check if it is plain file */
if (!S_ISREG(st.st_mode)) {
log_error_write(srv, __FILE__, __LINE__, "sb",
"not a regular file:", s->path_rrd);
return HANDLER_ERROR;
}
} else {
int r ;
/* create a new one */
BUFFER_COPY_STRING_CONST(p->cmd, "create ");
buffer_append_string_buffer(p->cmd, s->path_rrd);
buffer_append_string(p->cmd, " --step 60 ");
buffer_append_string(p->cmd, "DS:InOctets:ABSOLUTE:600:U:U ");
buffer_append_string(p->cmd, "DS:OutOctets:ABSOLUTE:600:U:U ");
buffer_append_string(p->cmd, "DS:Requests:ABSOLUTE:600:U:U ");
buffer_append_string(p->cmd, "RRA:AVERAGE:0.5:1:600 ");
buffer_append_string(p->cmd, "RRA:AVERAGE:0.5:6:700 ");
buffer_append_string(p->cmd, "RRA:AVERAGE:0.5:24:775 ");
buffer_append_string(p->cmd, "RRA:AVERAGE:0.5:288:797 ");
buffer_append_string(p->cmd, "RRA:MAX:0.5:1:600 ");
buffer_append_string(p->cmd, "RRA:MAX:0.5:6:700 ");
buffer_append_string(p->cmd, "RRA:MAX:0.5:24:775 ");
buffer_append_string(p->cmd, "RRA:MAX:0.5:288:797 ");
buffer_append_string(p->cmd, "RRA:MIN:0.5:1:600 ");
buffer_append_string(p->cmd, "RRA:MIN:0.5:6:700 ");
buffer_append_string(p->cmd, "RRA:MIN:0.5:24:775 ");
buffer_append_string(p->cmd, "RRA:MIN:0.5:288:797\n");
if (-1 == (r = write(p->write_fd, p->cmd->ptr, p->cmd->used - 1))) {
log_error_write(srv, __FILE__, __LINE__, "ss",
"rrdtool-write: failed", strerror(errno));
return HANDLER_ERROR;
}
buffer_prepare_copy(p->resp, 4096);
if (-1 == (r = read(p->read_fd, p->resp->ptr, p->resp->size))) {
log_error_write(srv, __FILE__, __LINE__, "ss",
"rrdtool-read: failed", strerror(errno));
return HANDLER_ERROR;
}
p->resp->used = r;
if (p->resp->ptr[0] != 'O' ||
p->resp->ptr[1] != 'K') {
log_error_write(srv, __FILE__, __LINE__, "sbb",
"rrdtool-response:", p->cmd, p->resp);
return HANDLER_ERROR;
}
}
return HANDLER_GO_ON;
}
#define PATCH(x) \
p->conf.x = s->x;
static int mod_rrd_patch_connection(server *srv, connection *con, plugin_data *p) {
size_t i, j;
plugin_config *s = p->config_storage[0];
PATCH(path_rrdtool_bin);
PATCH(path_rrd);
p->conf.bytes_written_ptr = &(s->bytes_written);
p->conf.bytes_read_ptr = &(s->bytes_read);
p->conf.requests_ptr = &(s->requests);
/* skip the first, the global context */
for (i = 1; i < srv->config_context->used; i++) {
data_config *dc = (data_config *)srv->config_context->data[i];
s = p->config_storage[i];
/* condition didn't match */
if (!config_check_cond(srv, con, dc)) continue;
/* merge config */
for (j = 0; j < dc->value->used; j++) {
data_unset *du = dc->value->data[j];
if (buffer_is_equal_string(du->key, CONST_STR_LEN("rrdtool.db-name"))) {
PATCH(path_rrd);
/* get pointers to double values */
p->conf.bytes_written_ptr = &(s->bytes_written);
p->conf.bytes_read_ptr = &(s->bytes_read);
p->conf.requests_ptr = &(s->requests);
}
}
}
return 0;
}
#undef PATCH
SETDEFAULTS_FUNC(mod_rrd_set_defaults) {
plugin_data *p = p_d;
size_t i;
config_values_t cv[] = {
{ "rrdtool.binary", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_SERVER },
{ "rrdtool.db-name", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION },
{ NULL, NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET }
};
if (!p) return HANDLER_ERROR;
p->config_storage = malloc(srv->config_context->used * sizeof(specific_config *));
for (i = 0; i < srv->config_context->used; i++) {
plugin_config *s;
s = malloc(sizeof(plugin_config));
s->path_rrdtool_bin = buffer_init();
s->path_rrd = buffer_init();
s->requests = 0;
s->bytes_written = 0;
s->bytes_read = 0;
cv[0].destination = s->path_rrdtool_bin;
cv[1].destination = s->path_rrd;
p->config_storage[i] = s;
if (0 != config_insert_values_global(srv, ((data_config *)srv->config_context->data[i])->value, cv)) {
return HANDLER_ERROR;
}
if (i > 0 && !buffer_is_empty(s->path_rrdtool_bin)) {
/* path_rrdtool_bin is a global option */
log_error_write(srv, __FILE__, __LINE__, "s",
"rrdtool.binary can only be set as a global option.");
return HANDLER_ERROR;
}
}
p->conf.path_rrdtool_bin = p->config_storage[0]->path_rrdtool_bin;
p->rrdtool_running = 0;
/* check for dir */
if (buffer_is_empty(p->conf.path_rrdtool_bin)) {
log_error_write(srv, __FILE__, __LINE__, "s",
"rrdtool.binary has to be set");
return HANDLER_ERROR;
}
/* open the pipe to rrdtool */
if (mod_rrd_create_pipe(srv, p)) {
return HANDLER_ERROR;
}
p->rrdtool_running = 1;
return HANDLER_GO_ON;
}
TRIGGER_FUNC(mod_rrd_trigger) {
plugin_data *p = p_d;
size_t i;
if (!p->rrdtool_running) return HANDLER_GO_ON;
if ((srv->cur_ts % 60) != 0) return HANDLER_GO_ON;
for (i = 0; i < srv->config_context->used; i++) {
plugin_config *s = p->config_storage[i];
int r;
if (buffer_is_empty(s->path_rrd)) continue;
/* write the data down every minute */
if (HANDLER_GO_ON != mod_rrdtool_create_rrd(srv, p, s)) return HANDLER_ERROR;
BUFFER_COPY_STRING_CONST(p->cmd, "update ");
buffer_append_string_buffer(p->cmd, s->path_rrd);
BUFFER_APPEND_STRING_CONST(p->cmd, " N:");
buffer_append_off_t(p->cmd, s->bytes_read);
BUFFER_APPEND_STRING_CONST(p->cmd, ":");
buffer_append_off_t(p->cmd, s->bytes_written);
BUFFER_APPEND_STRING_CONST(p->cmd, ":");
buffer_append_long(p->cmd, s->requests);
BUFFER_APPEND_STRING_CONST(p->cmd, "\n");
if (-1 == (r = write(p->write_fd, p->cmd->ptr, p->cmd->used - 1))) {
p->rrdtool_running = 0;
log_error_write(srv, __FILE__, __LINE__, "ss",
"rrdtool-write: failed", strerror(errno));
return HANDLER_ERROR;
}
buffer_prepare_copy(p->resp, 4096);
if (-1 == (r = read(p->read_fd, p->resp->ptr, p->resp->size))) {
p->rrdtool_running = 0;
log_error_write(srv, __FILE__, __LINE__, "ss",
"rrdtool-read: failed", strerror(errno));
return HANDLER_ERROR;
}
p->resp->used = r;
if (p->resp->ptr[0] != 'O' ||
p->resp->ptr[1] != 'K') {
p->rrdtool_running = 0;
log_error_write(srv, __FILE__, __LINE__, "sbb",
"rrdtool-response:", p->cmd, p->resp);
return HANDLER_ERROR;
}
s->requests = 0;
s->bytes_written = 0;
s->bytes_read = 0;
}
return HANDLER_GO_ON;
}
REQUESTDONE_FUNC(mod_rrd_account) {
plugin_data *p = p_d;
mod_rrd_patch_connection(srv, con, p);
*(p->conf.requests_ptr) += 1;
*(p->conf.bytes_written_ptr) += con->bytes_written;
*(p->conf.bytes_read_ptr) += con->bytes_read;
return HANDLER_GO_ON;
}
int mod_rrdtool_plugin_init(plugin *p) {
p->version = LIGHTTPD_VERSION_ID;
p->name = buffer_init_string("rrd");
p->init = mod_rrd_init;
p->cleanup = mod_rrd_free;
p->set_defaults= mod_rrd_set_defaults;
p->handle_trigger = mod_rrd_trigger;
p->handle_request_done = mod_rrd_account;
p->data = NULL;
return 0;
}