diff options
author | Andy Zhou <azhou@nicira.com> | 2015-03-11 21:20:44 -0700 |
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committer | Andy Zhou <azhou@nicira.com> | 2015-05-29 17:39:50 -0700 |
commit | 2fa1df7b88611f8858882147b5db122c5644799c (patch) | |
tree | f42dce9dc3ffd14e863b7f3e11045f7b82f012b4 /ovsdb/monitor.c | |
parent | 88b633082c0de646bebf1966bd06299692e4f9ba (diff) | |
download | openvswitch-2fa1df7b88611f8858882147b5db122c5644799c.tar.gz |
jsonrpc-server: Split out monitor backend functions to monitor.c/h
Added new files monitor.[ch] for monitor backend functions.
There is no functional changes.
Signed-off-by: Andy Zhou <azhou@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
Diffstat (limited to 'ovsdb/monitor.c')
-rw-r--r-- | ovsdb/monitor.c | 581 |
1 files changed, 581 insertions, 0 deletions
diff --git a/ovsdb/monitor.c b/ovsdb/monitor.c new file mode 100644 index 000000000..a1aeb5f51 --- /dev/null +++ b/ovsdb/monitor.c @@ -0,0 +1,581 @@ +/* + * Copyright (c) 2015 Nicira, Inc. + * + * 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 <config.h> + +#include <errno.h> + +#include "bitmap.h" +#include "column.h" +#include "dynamic-string.h" +#include "json.h" +#include "jsonrpc.h" +#include "ovsdb-error.h" +#include "ovsdb-parser.h" +#include "ovsdb.h" +#include "row.h" +#include "simap.h" +#include "table.h" +#include "timeval.h" +#include "transaction.h" +#include "jsonrpc-server.h" +#include "monitor.h" +#include "openvswitch/vlog.h" + + +static const struct ovsdb_replica_class ovsdb_jsonrpc_replica_class; + +/* Backend monitor. + * + * ovsdb_monitor keep track of the ovsdb changes. + */ + +/* A collection of tables being monitored. */ +struct ovsdb_monitor { + struct ovsdb_replica replica; + struct shash tables; /* Holds "struct ovsdb_monitor_table"s. */ + struct ovsdb_jsonrpc_monitor *jsonrpc_monitor; + struct ovsdb *db; +}; + +/* A particular column being monitored. */ +struct ovsdb_monitor_column { + const struct ovsdb_column *column; + enum ovsdb_monitor_selection select; +}; + +/* A row that has changed in a monitored table. */ +struct ovsdb_monitor_row { + struct hmap_node hmap_node; /* In ovsdb_jsonrpc_monitor_table.changes. */ + struct uuid uuid; /* UUID of row that changed. */ + struct ovsdb_datum *old; /* Old data, NULL for an inserted row. */ + struct ovsdb_datum *new; /* New data, NULL for a deleted row. */ +}; + +/* A particular table being monitored. */ +struct ovsdb_monitor_table { + const struct ovsdb_table *table; + + /* This is the union (bitwise-OR) of the 'select' values in all of the + * members of 'columns' below. */ + enum ovsdb_monitor_selection select; + + /* Columns being monitored. */ + struct ovsdb_monitor_column *columns; + size_t n_columns; + + /* Contains 'struct ovsdb_monitor_row's for rows that have been + * updated but not yet flushed to the jsonrpc connection. */ + struct hmap changes; +}; + +static int +compare_ovsdb_monitor_column(const void *a_, const void *b_) +{ + const struct ovsdb_monitor_column *a = a_; + const struct ovsdb_monitor_column *b = b_; + + return a->column < b->column ? -1 : a->column > b->column; +} + +static struct ovsdb_monitor * +ovsdb_monitor_cast(struct ovsdb_replica *replica) +{ + ovs_assert(replica->class == &ovsdb_jsonrpc_replica_class); + return CONTAINER_OF(replica, struct ovsdb_monitor, replica); +} + +/* Finds and returns the ovsdb_monitor_row in 'mt->changes' for the + * given 'uuid', or NULL if there is no such row. */ +static struct ovsdb_monitor_row * +ovsdb_monitor_row_find(const struct ovsdb_monitor_table *mt, + const struct uuid *uuid) +{ + struct ovsdb_monitor_row *row; + + HMAP_FOR_EACH_WITH_HASH (row, hmap_node, uuid_hash(uuid), &mt->changes) { + if (uuid_equals(uuid, &row->uuid)) { + return row; + } + } + return NULL; +} + +/* Allocates an array of 'mt->n_columns' ovsdb_datums and initializes them as + * copies of the data in 'row' drawn from the columns represented by + * mt->columns[]. Returns the array. + * + * If 'row' is NULL, returns NULL. */ +static struct ovsdb_datum * +clone_monitor_row_data(const struct ovsdb_monitor_table *mt, + const struct ovsdb_row *row) +{ + struct ovsdb_datum *data; + size_t i; + + if (!row) { + return NULL; + } + + data = xmalloc(mt->n_columns * sizeof *data); + for (i = 0; i < mt->n_columns; i++) { + const struct ovsdb_column *c = mt->columns[i].column; + const struct ovsdb_datum *src = &row->fields[c->index]; + struct ovsdb_datum *dst = &data[i]; + const struct ovsdb_type *type = &c->type; + + ovsdb_datum_clone(dst, src, type); + } + return data; +} + +/* Replaces the mt->n_columns ovsdb_datums in row[] by copies of the data from + * in 'row' drawn from the columns represented by mt->columns[]. */ +static void +update_monitor_row_data(const struct ovsdb_monitor_table *mt, + const struct ovsdb_row *row, + struct ovsdb_datum *data) +{ + size_t i; + + for (i = 0; i < mt->n_columns; i++) { + const struct ovsdb_column *c = mt->columns[i].column; + const struct ovsdb_datum *src = &row->fields[c->index]; + struct ovsdb_datum *dst = &data[i]; + const struct ovsdb_type *type = &c->type; + + if (!ovsdb_datum_equals(src, dst, type)) { + ovsdb_datum_destroy(dst, type); + ovsdb_datum_clone(dst, src, type); + } + } +} + +/* Frees all of the mt->n_columns ovsdb_datums in data[], using the types taken + * from mt->columns[], plus 'data' itself. */ +static void +free_monitor_row_data(const struct ovsdb_monitor_table *mt, + struct ovsdb_datum *data) +{ + if (data) { + size_t i; + + for (i = 0; i < mt->n_columns; i++) { + const struct ovsdb_column *c = mt->columns[i].column; + + ovsdb_datum_destroy(&data[i], &c->type); + } + free(data); + } +} + +/* Frees 'row', which must have been created from 'mt'. */ +static void +ovsdb_monitor_row_destroy(const struct ovsdb_monitor_table *mt, + struct ovsdb_monitor_row *row) +{ + if (row) { + free_monitor_row_data(mt, row->old); + free_monitor_row_data(mt, row->new); + free(row); + } +} + +struct ovsdb_monitor * +ovsdb_monitor_create(struct ovsdb *db, + struct ovsdb_jsonrpc_monitor *jsonrpc_monitor) +{ + struct ovsdb_monitor *dbmon; + + dbmon = xzalloc(sizeof *dbmon); + + ovsdb_replica_init(&dbmon->replica, &ovsdb_jsonrpc_replica_class); + ovsdb_add_replica(db, &dbmon->replica); + dbmon->jsonrpc_monitor = jsonrpc_monitor; + dbmon->db = db; + shash_init(&dbmon->tables); + + return dbmon; +} + +void +ovsdb_monitor_add_table(struct ovsdb_monitor *m, + const struct ovsdb_table *table) +{ + struct ovsdb_monitor_table *mt; + + mt = xzalloc(sizeof *mt); + mt->table = table; + hmap_init(&mt->changes); + shash_add(&m->tables, table->schema->name, mt); +} + +void +ovsdb_monitor_add_column(struct ovsdb_monitor *dbmon, + const struct ovsdb_table *table, + const struct ovsdb_column *column, + enum ovsdb_monitor_selection select, + size_t *allocated_columns) +{ + struct ovsdb_monitor_table *mt; + struct ovsdb_monitor_column *c; + + mt = shash_find_data(&dbmon->tables, table->schema->name); + + if (mt->n_columns >= *allocated_columns) { + mt->columns = x2nrealloc(mt->columns, allocated_columns, + sizeof *mt->columns); + } + + mt->select |= select; + c = &mt->columns[mt->n_columns++]; + c->column = column; + c->select = select; +} + +/* Check for duplicated column names. Return the first + * duplicated column's name if found. Otherwise return + * NULL. */ +const char * OVS_WARN_UNUSED_RESULT +ovsdb_monitor_table_check_duplicates(struct ovsdb_monitor *m, + const struct ovsdb_table *table) +{ + struct ovsdb_monitor_table *mt; + int i; + + mt = shash_find_data(&m->tables, table->schema->name); + + if (mt) { + /* Check for duplicate columns. */ + qsort(mt->columns, mt->n_columns, sizeof *mt->columns, + compare_ovsdb_monitor_column); + for (i = 1; i < mt->n_columns; i++) { + if (mt->columns[i].column == mt->columns[i - 1].column) { + return mt->columns[i].column->name; + } + } + } + + return NULL; +} + +/* Returns JSON for a <row-update> (as described in RFC 7047) for 'row' within + * 'mt', or NULL if no row update should be sent. + * + * The caller should specify 'initial' as true if the returned JSON is going to + * be used as part of the initial reply to a "monitor" request, false if it is + * going to be used as part of an "update" notification. + * + * 'changed' must be a scratch buffer for internal use that is at least + * bitmap_n_bytes(mt->n_columns) bytes long. */ +static struct json * +ovsdb_monitor_compose_row_update( + const struct ovsdb_monitor_table *mt, + const struct ovsdb_monitor_row *row, + bool initial, unsigned long int *changed) +{ + enum ovsdb_monitor_selection type; + struct json *old_json, *new_json; + struct json *row_json; + size_t i; + + type = (initial ? OJMS_INITIAL + : !row->old ? OJMS_INSERT + : !row->new ? OJMS_DELETE + : OJMS_MODIFY); + if (!(mt->select & type)) { + return NULL; + } + + if (type == OJMS_MODIFY) { + size_t n_changes; + + n_changes = 0; + memset(changed, 0, bitmap_n_bytes(mt->n_columns)); + for (i = 0; i < mt->n_columns; i++) { + const struct ovsdb_column *c = mt->columns[i].column; + if (!ovsdb_datum_equals(&row->old[i], &row->new[i], &c->type)) { + bitmap_set1(changed, i); + n_changes++; + } + } + if (!n_changes) { + /* No actual changes: presumably a row changed and then + * changed back later. */ + return NULL; + } + } + + row_json = json_object_create(); + old_json = new_json = NULL; + if (type & (OJMS_DELETE | OJMS_MODIFY)) { + old_json = json_object_create(); + json_object_put(row_json, "old", old_json); + } + if (type & (OJMS_INITIAL | OJMS_INSERT | OJMS_MODIFY)) { + new_json = json_object_create(); + json_object_put(row_json, "new", new_json); + } + for (i = 0; i < mt->n_columns; i++) { + const struct ovsdb_monitor_column *c = &mt->columns[i]; + + if (!(type & c->select)) { + /* We don't care about this type of change for this + * particular column (but we will care about it for some + * other column). */ + continue; + } + + if ((type == OJMS_MODIFY && bitmap_is_set(changed, i)) + || type == OJMS_DELETE) { + json_object_put(old_json, c->column->name, + ovsdb_datum_to_json(&row->old[i], + &c->column->type)); + } + if (type & (OJMS_INITIAL | OJMS_INSERT | OJMS_MODIFY)) { + json_object_put(new_json, c->column->name, + ovsdb_datum_to_json(&row->new[i], + &c->column->type)); + } + } + + return row_json; +} + +/* Constructs and returns JSON for a <table-updates> object (as described in + * RFC 7047) for all the outstanding changes within 'monitor', and deletes all + * the outstanding changes from 'monitor'. Returns NULL if no update needs to + * be sent. + * + * The caller should specify 'initial' as true if the returned JSON is going to + * be used as part of the initial reply to a "monitor" request, false if it is + * going to be used as part of an "update" notification. */ +struct json * +ovsdb_monitor_compose_table_update( + const struct ovsdb_monitor *dbmon, bool initial) +{ + struct shash_node *node; + unsigned long int *changed; + struct json *json; + size_t max_columns; + + max_columns = 0; + SHASH_FOR_EACH (node, &dbmon->tables) { + struct ovsdb_monitor_table *mt = node->data; + + max_columns = MAX(max_columns, mt->n_columns); + } + changed = xmalloc(bitmap_n_bytes(max_columns)); + + json = NULL; + SHASH_FOR_EACH (node, &dbmon->tables) { + struct ovsdb_monitor_table *mt = node->data; + struct ovsdb_monitor_row *row, *next; + struct json *table_json = NULL; + + HMAP_FOR_EACH_SAFE (row, next, hmap_node, &mt->changes) { + struct json *row_json; + + row_json = ovsdb_monitor_compose_row_update( + mt, row, initial, changed); + if (row_json) { + char uuid[UUID_LEN + 1]; + + /* Create JSON object for transaction overall. */ + if (!json) { + json = json_object_create(); + } + + /* Create JSON object for transaction on this table. */ + if (!table_json) { + table_json = json_object_create(); + json_object_put(json, mt->table->schema->name, table_json); + } + + /* Add JSON row to JSON table. */ + snprintf(uuid, sizeof uuid, UUID_FMT, UUID_ARGS(&row->uuid)); + json_object_put(table_json, uuid, row_json); + } + + hmap_remove(&mt->changes, &row->hmap_node); + ovsdb_monitor_row_destroy(mt, row); + } + } + + free(changed); + return json; +} + +bool +ovsdb_monitor_needs_flush(struct ovsdb_monitor *dbmon) +{ + struct shash_node *node; + + SHASH_FOR_EACH (node, &dbmon->tables) { + struct ovsdb_monitor_table *mt = node->data; + + if (!hmap_is_empty(&mt->changes)) { + return true; + } + } + return false; +} + +void +ovsdb_monitor_table_add_select(struct ovsdb_monitor *dbmon, + const struct ovsdb_table *table, + enum ovsdb_monitor_selection select) +{ + struct ovsdb_monitor_table * mt; + + mt = shash_find_data(&dbmon->tables, table->schema->name); + mt->select |= select; +} + +struct ovsdb_monitor_aux { + const struct ovsdb_monitor *monitor; + struct ovsdb_monitor_table *mt; +}; + +static void +ovsdb_monitor_init_aux(struct ovsdb_monitor_aux *aux, + const struct ovsdb_monitor *m) +{ + aux->monitor = m; + aux->mt = NULL; +} + +static bool +ovsdb_monitor_change_cb(const struct ovsdb_row *old, + const struct ovsdb_row *new, + const unsigned long int *changed OVS_UNUSED, + void *aux_) +{ + struct ovsdb_monitor_aux *aux = aux_; + const struct ovsdb_monitor *m = aux->monitor; + struct ovsdb_table *table = new ? new->table : old->table; + const struct uuid *uuid = ovsdb_row_get_uuid(new ? new : old); + struct ovsdb_monitor_row *change; + struct ovsdb_monitor_table *mt; + + if (!aux->mt || table != aux->mt->table) { + aux->mt = shash_find_data(&m->tables, table->schema->name); + if (!aux->mt) { + /* We don't care about rows in this table at all. Tell the caller + * to skip it. */ + return false; + } + } + mt = aux->mt; + + change = ovsdb_monitor_row_find(mt, uuid); + if (!change) { + change = xmalloc(sizeof *change); + hmap_insert(&mt->changes, &change->hmap_node, uuid_hash(uuid)); + change->uuid = *uuid; + change->old = clone_monitor_row_data(mt, old); + change->new = clone_monitor_row_data(mt, new); + } else { + if (new) { + update_monitor_row_data(mt, new, change->new); + } else { + free_monitor_row_data(mt, change->new); + change->new = NULL; + + if (!change->old) { + /* This row was added then deleted. Forget about it. */ + hmap_remove(&mt->changes, &change->hmap_node); + free(change); + } + } + } + return true; +} + +struct json * +ovsdb_monitor_get_initial(const struct ovsdb_monitor *dbmon) +{ + struct ovsdb_monitor_aux aux; + struct shash_node *node; + struct json *json; + + ovsdb_monitor_init_aux(&aux, dbmon); + SHASH_FOR_EACH (node, &dbmon->tables) { + struct ovsdb_monitor_table *mt = node->data; + + if (mt->select & OJMS_INITIAL) { + struct ovsdb_row *row; + + HMAP_FOR_EACH (row, hmap_node, &mt->table->rows) { + ovsdb_monitor_change_cb(NULL, row, NULL, &aux); + } + } + } + json = ovsdb_monitor_compose_table_update(dbmon, true); + return json ? json : json_object_create(); +} + +void +ovsdb_monitor_destroy(struct ovsdb_monitor *dbmon) +{ + struct shash_node *node; + + list_remove(&dbmon->replica.node); + + SHASH_FOR_EACH (node, &dbmon->tables) { + struct ovsdb_monitor_table *mt = node->data; + struct ovsdb_monitor_row *row, *next; + + HMAP_FOR_EACH_SAFE (row, next, hmap_node, &mt->changes) { + hmap_remove(&mt->changes, &row->hmap_node); + ovsdb_monitor_row_destroy(mt, row); + } + hmap_destroy(&mt->changes); + + free(mt->columns); + free(mt); + } + shash_destroy(&dbmon->tables); + free(dbmon); +} + +static struct ovsdb_error * +ovsdb_monitor_commit(struct ovsdb_replica *replica, + const struct ovsdb_txn *txn, + bool durable OVS_UNUSED) +{ + struct ovsdb_monitor *m = ovsdb_monitor_cast(replica); + struct ovsdb_monitor_aux aux; + + ovsdb_monitor_init_aux(&aux, m); + ovsdb_txn_for_each_change(txn, ovsdb_monitor_change_cb, &aux); + + return NULL; +} + +static void +ovsdb_monitor_destroy_callback(struct ovsdb_replica *replica) +{ + struct ovsdb_monitor *dbmon = ovsdb_monitor_cast(replica); + struct ovsdb_jsonrpc_monitor *m = dbmon->jsonrpc_monitor; + + ovsdb_jsonrpc_monitor_destroy(m); +} + +static const struct ovsdb_replica_class ovsdb_jsonrpc_replica_class = { + ovsdb_monitor_commit, + ovsdb_monitor_destroy_callback, +}; |