src/svm/svmdb.c


1
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.. _automatingthedeployment:

.. toctree::

Automating VPP deployment
__________________________


In order to make the VPP deployment easier inside AWS and Azure, we have created two different Terraform scripts, compatibles with both Public Cloud Provider. These scripts allow to automate the deployment of the resources. `Here you can find the scripts anf further information <https://github.com/francescospinelli94/Automating-Deployment-VPP>`_.
/*
 *------------------------------------------------------------------
 * svmdb.c -- simple shared memory database
 *
 * Copyright (c) 2009 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *------------------------------------------------------------------
 */

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <signal.h>
#include <pthread.h>
#include <unistd.h>
#include <time.h>
#include <fcntl.h>
#include <string.h>
#include <vppinfra/clib.h>
#include <vppinfra/vec.h>
#include <vppinfra/hash.h>
#include <vppinfra/bitmap.h>
#include <vppinfra/fifo.h>
#include <vppinfra/time.h>
#include <vppinfra/mheap.h>
#include <vppinfra/heap.h>
#include <vppinfra/pool.h>
#include <vppinfra/format.h>
#include <vppinfra/serialize.h>

#include "svmdb.h"

static void local_set_variable_nolock (svmdb_client_t * client,
				       svmdb_namespace_t namespace,
				       u8 * var, u8 * val, u32 elsize);

always_inline void
region_lock (svm_region_t * rp, int tag)
{
  pthread_mutex_lock (&rp->mutex);
#ifdef MUTEX_DEBUG
  rp->mutex_owner_pid = getpid ();
  rp->mutex_owner_tag = tag;
#endif
}

always_inline void
region_unlock (svm_region_t * rp)
{
#ifdef MUTEX_DEBUG
  rp->mutex_owner_pid = 0;
  rp->mutex_owner_tag = 0;
#endif
  pthread_mutex_unlock (&rp->mutex);
}

svmdb_client_t *
svmdb_map (svmdb_map_args_t * dba)
{
  svmdb_client_t *client = 0;
  svm_map_region_args_t *a = 0;
  svm_region_t *db_rp;
  void *oldheap;
  svmdb_shm_hdr_t *hp = 0;

  vec_validate (client, 0);
  vec_validate (a, 0);

  svm_region_init_chroot_uid_gid (dba->root_path, dba->uid, dba->gid);

  a->root_path = dba->root_path;
  a->name = "/db";
  a->size = dba->size ? dba->size : SVMDB_DEFAULT_SIZE;
  a->flags = SVM_FLAGS_MHEAP;
  a->uid = dba->uid;
  a->gid = dba->gid;

  db_rp = client->db_rp = svm_region_find_or_create (a);

  ASSERT (db_rp);

  vec_free (a);

  region_lock (client->db_rp, 10);
  /* Has someone else set up the shared-memory variable table? */
  if (db_rp->user_ctx)
    {
      client->shm = (void *) db_rp->user_ctx;
      client->pid = getpid ();
      region_unlock (client->db_rp);
      ASSERT (client->shm->version == SVMDB_SHM_VERSION);
      return (client);
    }
  /* Nope, it's our problem... */

  if (CLIB_DEBUG > 2)
    {
      /* Add a bogus client (pid=0) so the svm won't be deallocated */
      clib_warning
	("[%d] adding fake client (pid=0) so '%s' won't be unlinked",
	 getpid (), db_rp->region_name);
      oldheap = svm_push_pvt_heap (db_rp);
      vec_add1 (client->db_rp->client_pids, 0);
      svm_pop_heap (oldheap);
    }
  oldheap = svm_push_data_heap (db_rp);

  vec_validate (hp, 0);
  hp->version = SVMDB_SHM_VERSION;
  hp->namespaces[SVMDB_NAMESPACE_STRING]
    = hash_create_string (0, sizeof (uword));
  hp->namespaces[SVMDB_NAMESPACE_VEC]
    = hash_create_string (0, sizeof (uword));

  db_rp->user_ctx = hp;
  client->shm = hp;

  svm_pop_heap (oldheap);
  region_unlock (client->db_rp);
  client->pid = getpid ();

  return (client);
}

void
svmdb_unmap (svmdb_client_t * client)
{
  ASSERT (client);

  if (!svm_get_root_rp ())
    return;

  svm_region_unmap ((void *) client->db_rp);
  svm_region_exit ();
  vec_free (client);
}

static void
notify_value (svmdb_value_t * v, svmdb_action_t a)
{
  int i;
  int rv;
  union sigval sv;
  u32 value;
  u32 *dead_registrations = 0;

  svmdb_notify_t *np;

  for (i = 0; i < vec_len (v->notifications); i++)
    {
      np = vec_elt_at_index (v->notifications, i);
      if (np->action == a)
	{
	  value = (np->action << 28) | (np->opaque);
	  sv.sival_ptr = (void *) (uword) value;
	  do
	    {
	      rv = 0;
	      if (sigqueue (np->pid, np->signum, sv) == 0)
		break;
	      rv = errno;
	    }
	  while (rv == EAGAIN);
	  if (rv == 0)
	    continue;
	  vec_add1 (dead_registrations, i);
	}
    }

  for (i = 0; i < vec_len (dead_registrations); i++)
    {
      np = vec_elt_at_index (v->notifications, dead_registrations[i]);
      clib_warning ("dead reg pid %d sig %d action %d opaque %x",
		    np->pid, np->signum, np->action, np->opaque);
      vec_delete (v->notifications, 1, dead_registrations[i]);
    }
  vec_free (dead_registrations);
}

int
svmdb_local_add_del_notification (svmdb_client_t * client,
				  svmdb_notification_args_t * a)
{
  uword *h;
  void *oldheap;
  hash_pair_t *hp;
  svmdb_shm_hdr_t *shm;
  u8 *dummy_value = 0;
  svmdb_value_t *value;
  svmdb_notify_t *np;
  int i;
  int rv = 0;

  ASSERT (a->elsize);

  region_lock (client->db_rp, 18);
  shm = client->shm;
  oldheap = svm_push_data_heap (client->db_rp);

  h = shm->namespaces[a->nspace];

  hp = hash_get_pair_mem (h, a->var);
  if (hp == 0)
    {
      local_set_variable_nolock (client, a->nspace, (u8 *) a->var,
				 dummy_value, a->elsize);
      /* might have moved */
      h = shm->namespaces[a->nspace];
      hp = hash_get_pair_mem (h, a->var);
      ASSERT (hp);
    }

  value = pool_elt_at_index (shm->values, hp->value[0]);

  for (i = 0; i < vec_len (value->notifications); i++)
    {
      np = vec_elt_at_index (value->notifications, i);
      if ((np->pid == client->pid)
	  && (np->signum == a->signum)
	  && (np->action == a->action) && (np->opaque == a->opaque))
	{
	  if (a->add_del == 0 /* delete */ )
	    {
	      vec_delete (value->notifications, 1, i);
	      goto out;
	    }
	  else
	    {			/* add */
	      clib_warning
		("%s: ignore dup reg pid %d signum %d action %d opaque %x",
		 a->var, client->pid, a->signum, a->action, a->opaque);
	      rv = -2;
	      goto out;
	    }
	}
    }
  if (a->add_del == 0)
    {
      rv = -3;
      goto out;
    }

  vec_add2 (value->notifications, np, 1);
  np->pid = client->pid;
  np->signum = a->signum;
  np->action = a->action;
  np->opaque = a->opaque;

out:
  svm_pop_heap (oldheap);
  region_unlock (client->db_rp);
  return rv;
}


static void
local_unset_variable_nolock (svmdb_client_t * client,
			     svmdb_namespace_t namespace, char *var)
{
  uword *h;
  svmdb_value_t *oldvalue;
  hash_pair_t *hp;

  h = client->shm->namespaces[namespace];
  hp = hash_get_pair_mem (h, var);
  if (hp)
    {
      oldvalue = pool_elt_at_index (client->shm->values, hp->value[0]);
      if (vec_len (oldvalue->notifications))
	notify_value (oldvalue, SVMDB_ACTION_UNSET);
      /* zero length value means unset */
      _vec_len (oldvalue->value) = 0;
    }
  client->shm->namespaces[namespace] = h;
}

void
svmdb_local_unset_string_variable (svmdb_client_t * client, char *var)
{
  void *oldheap;

  region_lock (client->db_rp, 11);
  oldheap = svm_push_data_heap (client->db_rp);
  local_unset_variable_nolock (client, SVMDB_NAMESPACE_STRING, var);
  svm_pop_heap (oldheap);
  region_unlock (client->db_rp);
}

static void
local_set_variable_nolock (svmdb_client_t * client,
			   svmdb_namespace_t namespace,
			   u8 * var, u8 * val, u32 elsize)
{
  uword *h;
  hash_pair_t *hp;
  u8 *name;
  svmdb_shm_hdr_t *shm;

  shm = client->shm;
  h = shm->namespaces[namespace];
  hp = hash_get_pair_mem (h, var);
  if (hp)
    {
      svmdb_value_t *oldvalue;
      oldvalue = pool_elt_at_index (client->shm->values, hp->value[0]);
      vec_alloc (oldvalue->value, vec_len (val) * elsize);
      clib_memcpy (oldvalue->value, val, vec_len (val) * elsize);
      _vec_len (oldvalue->value) = vec_len (val);
      notify_value (oldvalue, SVMDB_ACTION_SET);
    }
  else
    {
      svmdb_value_t *newvalue;
      pool_get (shm->values, newvalue);
      clib_memset (newvalue, 0, sizeof (*newvalue));
      newvalue->elsize = elsize;
      vec_alloc (newvalue->value, vec_len (val) * elsize);
      clib_memcpy (newvalue->value, val, vec_len (val) * elsize);
      _vec_len (newvalue->value) = vec_len (val);
      name = format (0, "%s%c", var, 0);
      hash_set_mem (h, name, newvalue - shm->values);
    }
  shm->namespaces[namespace] = h;
}

void
svmdb_local_set_string_variable (svmdb_client_t * client,
				 char *var, char *val)
{
  void *oldheap;

  region_lock (client->db_rp, 12);
  oldheap = svm_push_data_heap (client->db_rp);

  local_unset_variable_nolock (client, SVMDB_NAMESPACE_STRING, var);

  local_set_variable_nolock (client, SVMDB_NAMESPACE_STRING,
			     (u8 *) var, (u8 *) val, 1 /* elsize */ );
  svm_pop_heap (oldheap);
  region_unlock (client->db_rp);
}

static u8 *
local_get_variable_nolock (svmdb_client_t * client,
			   svmdb_namespace_t namespace, u8 * var)
{
  uword *h;
  uword *p;
  svmdb_shm_hdr_t *shm;
  svmdb_value_t *oldvalue;

  shm = client->shm;
  h = shm->namespaces[namespace];
  p = hash_get_mem (h, var);
  if (p)
    {
      oldvalue = pool_elt_at_index (shm->values, p[0]);
      notify_value (oldvalue, SVMDB_ACTION_GET);
      return (oldvalue->value);
    }
  return 0;
}

void *
svmdb_local_get_variable_reference (svmdb_client_t * client,
				    svmdb_namespace_t namespace, char *var)
{
  u8 *rv;

  region_lock (client->db_rp, 19);
  rv = local_get_variable_nolock (client, namespace, (u8 *) var);
  region_unlock (client->db_rp);
  return (void *) rv;
}

char *
svmdb_local_get_string_variable (svmdb_client_t * client, char *var)
{
  u8 *rv = 0;

  region_lock (client->db_rp, 13);
  rv = local_get_variable_nolock (client, SVMDB_NAMESPACE_STRING, (u8 *) var);

  if (rv && vec_len (rv))
    {
      rv = format (0, "%s", rv);
      vec_add1 (rv, 0);
    }
  region_unlock (client->db_rp);
  return ((char *) rv);
}

void
svmdb_local_dump_strings (svmdb_client_t * client)
{
  uword *h;
  u8 *key;
  u32 value;
  svmdb_shm_hdr_t *shm = client->shm;

  region_lock (client->db_rp, 14);

  h = client->shm->namespaces[SVMDB_NAMESPACE_STRING];

  /* *INDENT-OFF* */
  hash_foreach_mem(key, value, h,
  ({
    svmdb_value_t *v = pool_elt_at_index (shm->values, value);

    fformat(stdout, "%s: %s\n", key,
            vec_len(v->value) ? v->value : (u8 *)"(nil)");
  }));
  /* *INDENT-ON* */
  region_unlock (client->db_rp);
}

int
svmdb_local_serialize_strings (svmdb_client_t * client, char *filename)
{
  uword *h;
  u8 *key;
  u32 value;
  svmdb_shm_hdr_t *shm = client->shm;
  serialize_main_t _sm, *sm = &_sm;
  clib_error_t *error = 0;
  u8 *sanitized_name = 0;
  int fd = 0;

  if (strstr (filename, "..") || index (filename, '/'))
    {
      error = clib_error_return (0, "Illegal characters in filename '%s'",
				 filename);
      goto out;
    }

  sanitized_name = format (0, "/tmp/%s%c", filename, 0);

  fd = creat ((char *) sanitized_name, 0644);

  if (fd < 0)
    {
      error = clib_error_return_unix (0, "Create '%s'", sanitized_name);
      goto out;
    }

  serialize_open_clib_file_descriptor (sm, fd);

  region_lock (client->db_rp, 20);

  h = client->shm->namespaces[SVMDB_NAMESPACE_STRING];

  serialize_likely_small_unsigned_integer (sm, hash_elts (h));

  /* *INDENT-OFF* */
  hash_foreach_mem(key, value, h,
  ({
    svmdb_value_t *v = pool_elt_at_index (shm->values, value);

    /* Omit names with nil values */
    if (vec_len(v->value))
      {
        serialize_cstring (sm, (char *)key);
        serialize_cstring (sm, (char *)v->value);
      }
  }));
  /* *INDENT-ON* */
  region_unlock (client->db_rp);

  serialize_close (sm);

out:
  if (fd > 0 && close (fd) < 0)
    error = clib_error_return_unix (0, "close fd %d", fd);

  if (error)
    {
      clib_error_report (error);
      return -1;
    }
  return 0;
}

int
svmdb_local_unserialize_strings (svmdb_client_t * client, char *filename)
{
  serialize_main_t _sm, *sm = &_sm;
  void *oldheap;
  clib_error_t *error = 0;
  u8 *key, *value;
  int fd = 0;
  u32 nelts;
  int i;

  fd = open (filename, O_RDONLY);

  if (fd < 0)
    {
      error = clib_error_return_unix (0, "Failed to open '%s'", filename);
      goto out;
    }

  unserialize_open_clib_file_descriptor (sm, fd);

  region_lock (client->db_rp, 21);
  oldheap = svm_push_data_heap (client->db_rp);

  nelts = unserialize_likely_small_unsigned_integer (sm);

  for (i = 0; i < nelts; i++)
    {
      unserialize_cstring (sm, (char **) &key);
      unserialize_cstring (sm, (char **) &value);
      local_set_variable_nolock (client, SVMDB_NAMESPACE_STRING,
				 key, value, 1 /* elsize */ );
      vec_free (key);
      vec_free (value);
    }
  svm_pop_heap (oldheap);
  region_unlock (client->db_rp);

  serialize_close (sm);

out:
  if (fd > 0 && close (fd) < 0)
    error = clib_error_return_unix (0, "close fd %d", fd);

  if (error)
    {
      clib_error_report (error);
      return -1;
    }
  return 0;
}

void
svmdb_local_unset_vec_variable (svmdb_client_t * client, char *var)
{
  void *oldheap;

  region_lock (client->db_rp, 15);
  oldheap = svm_push_data_heap (client->db_rp);
  local_unset_variable_nolock (client, SVMDB_NAMESPACE_VEC, var);
  svm_pop_heap (oldheap);
  region_unlock (client->db_rp);
}

void
svmdb_local_set_vec_variable (svmdb_client_t * client,
			      char *var, void *val_arg, u32 elsize)
{
  u8 *val = (u8 *) val_arg;
  void *oldheap;

  region_lock (client->db_rp, 16);
  oldheap = svm_push_data_heap (client->db_rp);

  local_unset_variable_nolock (client, SVMDB_NAMESPACE_VEC, var);
  local_set_variable_nolock (client, SVMDB_NAMESPACE_VEC, (u8 *) var,
			     val, elsize);

  svm_pop_heap (oldheap);
  region_unlock (client->db_rp);
}

void *
svmdb_local_get_vec_variable (svmdb_client_t * client, char *var, u32 elsize)
{
  u8 *rv = 0;
  u8 *copy = 0;

  region_lock (client->db_rp, 17);

  rv = local_get_variable_nolock (client, SVMDB_NAMESPACE_VEC, (u8 *) var);

  if (rv && vec_len (rv))
    {
      /* Make a copy in process-local memory */
      vec_alloc (copy, vec_len (rv) * elsize);
      clib_memcpy (copy, rv, vec_len (rv) * elsize);
      _vec_len (copy) = vec_len (rv);
      region_unlock (client->db_rp);
      return (copy);
    }
  region_unlock (client->db_rp);
  return (0);
}

void
svmdb_local_dump_vecs (svmdb_client_t * client)
{
  uword *h;
  u8 *key;
  u32 value;
  svmdb_shm_hdr_t *shm;

  region_lock (client->db_rp, 17);
  shm = client->shm;

  h = client->shm->namespaces[SVMDB_NAMESPACE_VEC];

  /* *INDENT-OFF* */
  hash_foreach_mem(key, value, h,
  ({
    svmdb_value_t *v = pool_elt_at_index (shm->values, value);
    (void) fformat(stdout, "%s:\n %U (%.2f)\n", key,
                   format_hex_bytes, v->value,
                   vec_len(v->value)*v->elsize, ((f64 *)(v->value))[0]);
  }));
  /* *INDENT-ON* */

  region_unlock (client->db_rp);
}

void *
svmdb_local_find_or_add_vec_variable (svmdb_client_t * client,
				      char *var, u32 nbytes)
{
  void *oldheap;
  u8 *rv = 0;

  region_lock (client->db_rp, 18);
  oldheap = svm_push_data_heap (client->db_rp);

  rv = local_get_variable_nolock (client, SVMDB_NAMESPACE_VEC, (u8 *) var);

  if (rv)
    {
      goto out;
    }
  else
    {
      uword *h;
      u8 *name;
      svmdb_shm_hdr_t *shm;
      svmdb_value_t *newvalue;

      shm = client->shm;
      h = shm->namespaces[SVMDB_NAMESPACE_VEC];

      pool_get (shm->values, newvalue);
      clib_memset (newvalue, 0, sizeof (*newvalue));
      newvalue->elsize = 1;
      vec_alloc (newvalue->value, nbytes);
      _vec_len (newvalue->value) = nbytes;
      name = format (0, "%s%c", var, 0);
      hash_set_mem (h, name, newvalue - shm->values);
      shm->namespaces[SVMDB_NAMESPACE_VEC] = h;
      rv = newvalue->value;
    }

out:
  svm_pop_heap (oldheap);
  region_unlock (client->db_rp);
  return (rv);
}

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */