#include "rrd.h"
#include "rrd_client.h"
+#include "rrd_tool.h"
#include <stdlib.h>
#include <string.h>
#include <sys/un.h>
#include <netdb.h>
+#ifndef ENODATA
+#define ENODATA ENOENT
+#endif
+
+struct rrdc_response_s
+{
+ int status;
+ char *message;
+ char **lines;
+ size_t lines_num;
+};
+typedef struct rrdc_response_s rrdc_response_t;
+
static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
static int sd = -1;
+static char *sd_path = NULL; /* cache the path for sd */
+static void _disconnect(void);
static ssize_t sread (void *buffer_void, size_t buffer_size) /* {{{ */
{
if (status == 0)
{
- close (sd);
- sd = -1;
+ _disconnect();
errno = EPROTO;
return (-1);
}
assert ((0 > status) || (buffer_free >= (size_t) status));
- buffer_free = buffer_free - status;
- buffer_used = buffer_used + status;
+ buffer_free -= status;
+ buffer_used += status;
if (buffer[buffer_used - 1] == '\n')
break;
return (-1);
}
- buffer[buffer_used - 1] = 0;
+ buffer[buffer_used - 1] = '\0';
return (buffer_used);
} /* }}} ssize_t sread */
if (status < 0)
{
- close (sd);
- sd = -1;
+ _disconnect();
+ rrd_set_error("lost connection to rrdcached");
return (status);
}
- nleft = nleft - status;
- ptr = ptr + status;
+ nleft -= status;
+ ptr += status;
}
return (0);
return (buffer_add_string (temp, buffer_ret, buffer_size_ret));
} /* }}} int buffer_add_value */
-static int rrdc_connect_unix (const char *path) /* {{{ */
+static int response_parse (char *buffer, size_t buffer_size, /* {{{ */
+ rrdc_response_t **ret_response)
{
- struct sockaddr_un sa;
- int status;
+ rrdc_response_t *ret;
- assert (path != NULL);
+ char *dummy;
+ char *saveptr;
- pthread_mutex_lock (&lock);
+ char *line_ptr;
+ size_t line_counter;
- if (sd >= 0)
+ if (buffer == NULL)
+ return (EINVAL);
+ if (buffer_size <= 0)
+ return (EINVAL);
+
+ if (buffer[buffer_size - 1] != 0)
+ return (-1);
+
+ ret = (rrdc_response_t *) malloc (sizeof (rrdc_response_t));
+ if (ret == NULL)
+ return (ENOMEM);
+ memset (ret, 0, sizeof (*ret));
+
+ line_counter = 0;
+
+ dummy = buffer;
+ saveptr = NULL;
+ while ((line_ptr = strtok_r (dummy, "\r\n", &saveptr)) != NULL)
{
- pthread_mutex_unlock (&lock);
- return (0);
+ dummy = NULL;
+
+ if (ret->message == NULL)
+ {
+ ret->status = strtol (buffer, &ret->message, 0);
+ if (buffer == ret->message)
+ {
+ free (ret);
+ return (EPROTO);
+ }
+
+ /* Skip leading whitespace of the status message */
+ ret->message += strspn (ret->message, " \t");
+
+ if (ret->status > 0)
+ {
+ ret->lines = (char **) malloc (sizeof (char *) * ret->status);
+ if (ret->lines == NULL)
+ {
+ free (ret);
+ return (ENOMEM);
+ }
+ memset (ret->lines, 0, sizeof (char *) * ret->status);
+ ret->lines_num = (size_t) ret->status;
+ }
+ else
+ {
+ ret->lines = NULL;
+ ret->lines_num = 0;
+ }
+ }
+ else /* if (ret->message != NULL) */
+ {
+ if (line_counter < ret->lines_num)
+ ret->lines[line_counter] = line_ptr;
+ line_counter++;
+ }
+ } /* while (strtok_r) */
+
+ if (ret->lines_num != line_counter)
+ {
+ errno = EPROTO;
+ if (ret->lines != NULL)
+ free (ret->lines);
+ free (ret);
+ return (-1);
+ }
+
+ *ret_response = ret;
+ return (0);
+} /* }}} int response_parse */
+
+static void response_free (rrdc_response_t *res) /* {{{ */
+{
+ if (res == NULL)
+ return;
+
+ if (res->lines != NULL)
+ {
+ res->lines_num = 0;
+ free (res->lines);
+ res->lines = NULL;
}
+ free (res);
+} /* }}} void response_free */
+
+
+/* determine whether we are connected to the specified daemon_addr if
+ * NULL, return whether we are connected at all
+ */
+int rrdc_is_connected(const char *daemon_addr) /* {{{ */
+{
+ if (sd < 0)
+ return 0;
+ else if (daemon_addr == NULL)
+ {
+ /* here we have to handle the case i.e.
+ * UPDATE --daemon ...; UPDATEV (no --daemon) ...
+ * In other words: we have a cached connection,
+ * but it is not specified in the current command.
+ * Daemon is only implied in this case if set in ENV
+ */
+ if (getenv(ENV_RRDCACHED_ADDRESS) != NULL)
+ return 1;
+ else
+ return 0;
+ }
+ else if (strcmp(daemon_addr, sd_path) == 0)
+ return 1;
+ else
+ return 0;
+
+} /* }}} int rrdc_is_connected */
+
+static int rrdc_connect_unix (const char *path) /* {{{ */
+{
+ struct sockaddr_un sa;
+ int status;
+
+ assert (path != NULL);
+ assert (sd == -1);
+
sd = socket (PF_UNIX, SOCK_STREAM, /* protocol = */ 0);
if (sd < 0)
{
status = errno;
- pthread_mutex_unlock (&lock);
return (status);
}
if (status != 0)
{
status = errno;
- pthread_mutex_unlock (&lock);
return (status);
}
- pthread_mutex_unlock (&lock);
-
return (0);
} /* }}} int rrdc_connect_unix */
-int rrdc_connect (const char *addr) /* {{{ */
+static int rrdc_connect_network (const char *addr) /* {{{ */
{
struct addrinfo ai_hints;
struct addrinfo *ai_res;
struct addrinfo *ai_ptr;
- int status;
-
- if (addr == NULL)
- addr = RRDCACHED_DEFAULT_ADDRESS;
- if (strncmp ("unix:", addr, strlen ("unix:")) == 0)
- return (rrdc_connect_unix (addr + strlen ("unix:")));
- else if (addr[0] == '/')
- return (rrdc_connect_unix (addr));
-
- pthread_mutex_lock (&lock);
-
- if (sd >= 0)
- {
- pthread_mutex_unlock (&lock);
- return (0);
- }
+ assert (addr != NULL);
+ assert (sd == -1);
+ int status;
memset (&ai_hints, 0, sizeof (ai_hints));
ai_hints.ai_flags = 0;
#ifdef AI_ADDRCONFIG
ai_res = NULL;
status = getaddrinfo (addr, RRDCACHED_DEFAULT_PORT, &ai_hints, &ai_res);
if (status != 0)
- {
- pthread_mutex_unlock (&lock);
return (status);
- }
for (ai_ptr = ai_res; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
{
if (status != 0)
{
status = errno;
- close (sd);
- sd = -1;
+ _disconnect();
continue;
}
assert (status == 0);
break;
} /* for (ai_ptr) */
- pthread_mutex_unlock (&lock);
return (status);
-} /* }}} int rrdc_connect */
+} /* }}} int rrdc_connect_network */
-int rrdc_disconnect (void) /* {{{ */
+int rrdc_connect (const char *addr) /* {{{ */
{
- pthread_mutex_lock (&lock);
+ int status = 0;
- if (sd < 0)
+ if (addr == NULL)
+ addr = getenv (ENV_RRDCACHED_ADDRESS);
+
+ if (addr == NULL)
+ return 0;
+
+ pthread_mutex_lock(&lock);
+
+ if (sd >= 0 && sd_path != NULL && strcmp(addr, sd_path) == 0)
{
+ /* connection to the same daemon; use cached connection */
pthread_mutex_unlock (&lock);
return (0);
}
+ else
+ {
+ _disconnect();
+ }
+
+ if (strncmp ("unix:", addr, strlen ("unix:")) == 0)
+ status = rrdc_connect_unix (addr + strlen ("unix:"));
+ else if (addr[0] == '/')
+ status = rrdc_connect_unix (addr);
+ else
+ status = rrdc_connect_network(addr);
+
+ if (status == 0 && sd >= 0)
+ sd_path = strdup(addr);
+ else
+ rrd_set_error("Unable to connect to rrdcached: %s",
+ (status < 0)
+ ? "Internal error"
+ : rrd_strerror (status));
+
+ pthread_mutex_unlock (&lock);
+ return (status);
+} /* }}} int rrdc_connect */
+
+static void _disconnect(void) /* {{{ */
+{
+ if (sd >= 0)
+ close(sd);
+
+ if (sd_path != NULL)
+ free(sd_path);
- close (sd);
sd = -1;
+ sd_path = NULL;
+} /* }}} static void _disconnect(void) */
+
+int rrdc_disconnect (void) /* {{{ */
+{
+ pthread_mutex_lock (&lock);
+
+ _disconnect();
pthread_mutex_unlock (&lock);
return (status);
} /* }}} int rrdc_flush */
+
+
+/* convenience function; if there is a daemon specified, or if we can
+ * detect one from the environment, then flush the file. Otherwise, no-op
+ */
+int rrdc_flush_if_daemon (const char *opt_daemon, const char *filename) /* {{{ */
+{
+ int status = 0;
+
+ rrdc_connect(opt_daemon);
+
+ if (rrdc_is_connected(opt_daemon))
+ {
+ status = rrdc_flush (filename);
+ if (status != 0)
+ {
+ rrd_set_error ("rrdc_flush (%s) failed with status %i.",
+ filename, status);
+ }
+ } /* if (daemon_addr) */
+
+ return status;
+} /* }}} int rrdc_flush_if_daemon */
+
+
+int rrdc_stats_get (rrdc_stats_t **ret_stats) /* {{{ */
+{
+ rrdc_stats_t *head;
+ rrdc_stats_t *tail;
+
+ rrdc_response_t *response;
+
+ char buffer[4096];
+ size_t buffer_size;
+ int status;
+ size_t i;
+
+ pthread_mutex_lock (&lock);
+
+ if (sd < 0)
+ {
+ pthread_mutex_unlock (&lock);
+ return (ENOTCONN);
+ }
+
+ /* Protocol example: {{{
+ * -> STATS
+ * <- 5 Statistics follow
+ * <- QueueLength: 0
+ * <- UpdatesWritten: 0
+ * <- DataSetsWritten: 0
+ * <- TreeNodesNumber: 0
+ * <- TreeDepth: 0
+ * }}} */
+ status = swrite ("STATS\n", strlen ("STATS\n"));
+ if (status != 0)
+ {
+ pthread_mutex_unlock (&lock);
+ return (status);
+ }
+
+ status = sread (buffer, sizeof (buffer));
+ if (status < 0)
+ {
+ status = errno;
+ pthread_mutex_unlock (&lock);
+ return (status);
+ }
+ else if (status == 0)
+ {
+ pthread_mutex_unlock (&lock);
+ return (ENODATA);
+ }
+
+ pthread_mutex_unlock (&lock);
+
+ /* Assert NULL termination */
+ buffer_size = (size_t) status;
+ if (buffer[buffer_size - 1] != 0)
+ {
+ if (buffer_size < sizeof (buffer))
+ {
+ buffer[buffer_size] = 0;
+ buffer_size++;
+ }
+ else
+ {
+ return (ENOBUFS);
+ }
+ }
+
+ status = response_parse (buffer, buffer_size, &response);
+ if (status != 0)
+ return (status);
+
+ if (response->status <= 0)
+ {
+ response_free (response);
+ return (EIO);
+ }
+
+ head = NULL;
+ tail = NULL;
+ for (i = 0; i < response->lines_num; i++)
+ {
+ char *key;
+ char *value;
+ char *endptr;
+ rrdc_stats_t *s;
+
+ key = response->lines[i];
+ value = strchr (key, ':');
+ if (value == NULL)
+ continue;
+ *value = 0;
+ value++;
+
+ while ((value[0] == ' ') || (value[0] == '\t'))
+ value++;
+
+ s = (rrdc_stats_t *) malloc (sizeof (rrdc_stats_t));
+ if (s == NULL)
+ continue;
+ memset (s, 0, sizeof (*s));
+
+ s->name = strdup (key);
+
+ endptr = NULL;
+ if ((strcmp ("QueueLength", key) == 0)
+ || (strcmp ("TreeNodesNumber", key) == 0)
+ || (strcmp ("TreeDepth", key) == 0))
+ {
+ s->type = RRDC_STATS_TYPE_GAUGE;
+ s->value.gauge = strtod (value, &endptr);
+ }
+ else if ((strcmp ("UpdatesWritten", key) == 0)
+ || (strcmp ("DataSetsWritten", key) == 0))
+ {
+ s->type = RRDC_STATS_TYPE_COUNTER;
+ s->value.counter = (uint64_t) strtoll (value, &endptr, /* base = */ 0);
+ }
+ else
+ {
+ free (s);
+ continue;
+ }
+
+ /* Conversion failed */
+ if (endptr == value)
+ {
+ free (s);
+ continue;
+ }
+
+ if (head == NULL)
+ {
+ head = s;
+ tail = s;
+ s->next = NULL;
+ }
+ else
+ {
+ tail->next = s;
+ tail = s;
+ }
+ } /* for (i = 0; i < response->lines_num; i++) */
+
+ response_free (response);
+
+ if (head == NULL)
+ return (EPROTO);
+
+ *ret_stats = head;
+ return (0);
+} /* }}} int rrdc_stats_get */
+
+void rrdc_stats_free (rrdc_stats_t *ret_stats) /* {{{ */
+{
+ rrdc_stats_t *this;
+
+ this = ret_stats;
+ while (this != NULL)
+ {
+ rrdc_stats_t *next;
+
+ next = this->next;
+
+ if (this->name != NULL)
+ {
+ free (this->name);
+ this->name = NULL;
+ }
+ free (this);
+
+ this = next;
+ } /* while (this != NULL) */
+} /* }}} void rrdc_stats_free */
+
/*
* vim: set sw=2 sts=2 ts=8 et fdm=marker :
*/
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