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@@ -19,6 +19,7 @@
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#include <boost/algorithm/string/split.hpp>
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#include <boost/algorithm/string/classification.hpp>
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+#include <boost/array.hpp>
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#include <boost/pointer_cast.hpp>
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#include <boost/static_assert.hpp>
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@@ -35,7 +36,7 @@ namespace {
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/// @brief Maximum length of option value.
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/// The maximum size of the raw option data that may be read from the
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-/// database.
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+/// database.
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const size_t OPTION_VALUE_MAX_LEN = 4096;
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/// @brief Numeric value representing last supported identifier.
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@@ -1105,10 +1106,6 @@ public:
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///
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/// The contents of the enum are indexes into the list of SQL statements
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enum StatementIndex {
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- INSERT_HOST, // Insert new host to collection
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- INSERT_V6_RESRV, // Insert v6 reservation
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- INSERT_V4_HOST_OPTION, // Insert DHCPv4 option
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- INSERT_V6_HOST_OPTION, // Insert DHCPv6 option
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GET_HOST_DHCPID, // Gets hosts by host identifier
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GET_HOST_ADDR, // Gets hosts by IPv4 address
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GET_HOST_SUBID4_DHCPID, // Gets host by IPv4 SubnetID, HW address/DUID
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@@ -1116,9 +1113,20 @@ public:
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GET_HOST_SUBID_ADDR, // Gets host by IPv4 SubnetID and IPv4 address
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GET_HOST_PREFIX, // Gets host by IPv6 prefix
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GET_VERSION, // Obtain version number
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+ INSERT_HOST, // Insert new host to collection
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+ INSERT_V6_RESRV, // Insert v6 reservation
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+ INSERT_V4_HOST_OPTION, // Insert DHCPv4 option
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+ INSERT_V6_HOST_OPTION, // Insert DHCPv6 option
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NUM_STATEMENTS // Number of statements
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};
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+ /// @brief Index of first statement performing write to the database.
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+ ///
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+ /// This value is used to mark border line between queries and other
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+ /// statements and statements performing write operation on the database,
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+ /// such as INSERT, DELETE, UPDATE.
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+ static const StatementIndex WRITE_STMTS_BEGIN = INSERT_HOST;
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+
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/// @brief Constructor.
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///
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/// This constructor opens database connection and initializes prepared
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@@ -1258,66 +1266,25 @@ public:
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/// @brief MySQL connection
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PgSqlConnection conn_;
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+ /// @brief Indicates if the database is opened in read only mode.
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+ bool is_readonly_;
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};
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namespace {
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+/// @brief Array of tagged statements.
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+typedef boost::array<PgSqlTaggedStatement, PgSqlHostDataSourceImpl::NUM_STATEMENTS>
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+TaggedStatementArray;
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+
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/// @brief Prepared PosgreSQL statements used by the backend to insert and
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/// retrieve reservation data from the database.
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-PgSqlTaggedStatement tagged_statements[] = {
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- // PgSqlHostDataSourceImpl::INSERT_HOST
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- // Inserts a host into the 'hosts' table. Returns the inserted host id.
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- {8,
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- { OID_BYTEA, OID_INT2,
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- OID_INT4, OID_INT4, OID_INT8, OID_VARCHAR,
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- OID_VARCHAR, OID_VARCHAR },
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- "insert_host",
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- "INSERT INTO hosts(dhcp_identifier, dhcp_identifier_type, "
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- " dhcp4_subnet_id, dhcp6_subnet_id, ipv4_address, hostname, "
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- " dhcp4_client_classes, dhcp6_client_classes) "
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- "VALUES ($1, $2, $3, $4, $5, $6, $7, $8) RETURNING host_id"
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- },
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-
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- //PgSqlHostDataSourceImpl::INSERT_V6_RESRV
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- // Inserts a single IPv6 reservation into 'reservations' table.
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- {5,
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- { OID_VARCHAR, OID_INT2, OID_INT4, OID_INT4, OID_INT4 },
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- "insert_v6_resrv",
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- "INSERT INTO ipv6_reservations(address, prefix_len, type, "
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- " dhcp6_iaid, host_id) "
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- "VALUES ($1, $2, $3, $4, $5)"
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- },
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-
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- // PgSqlHostDataSourceImpl::INSERT_V4_HOST_OPTION
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- // Inserts a single DHCPv4 option into 'dhcp4_options' table.
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- // Using fixed scope_id = 3, which associates an option with host.
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- {6,
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- { OID_INT2, OID_BYTEA, OID_TEXT,
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- OID_VARCHAR, OID_BOOL, OID_INT8},
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- "insert_v4_host_option",
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- "INSERT INTO dhcp4_options(code, value, formatted_value, space, "
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- " persistent, host_id, scope_id) "
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- "VALUES ($1, $2, $3, $4, $5, $6, 3)"
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- },
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-
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- // PgSqlHostDataSourceImpl::INSERT_V6_HOST_OPTION
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- // Inserts a single DHCPv6 option into 'dhcp6_options' table.
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- // Using fixed scope_id = 3, which associates an option with host.
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- {6,
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- { OID_INT2, OID_BYTEA, OID_TEXT,
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- OID_VARCHAR, OID_BOOL, OID_INT8},
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- "insert_v6_host_option",
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- "INSERT INTO dhcp6_options(code, value, formatted_value, space, "
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- " persistent, host_id, scope_id) "
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- "VALUES ($1, $2, $3, $4, $5, $6, 3)"
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- },
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-
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+TaggedStatementArray tagged_statements = { {
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// PgSqlHostDataSourceImpl::GET_HOST_DHCPID
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// Retrieves host information, IPv6 reservations and both DHCPv4 and
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// DHCPv6 options associated with the host. The LEFT JOIN clause is used
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// to retrieve information from 4 different tables using a single query.
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// Hence, this query returns multiple rows for a single host.
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- {2,
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+ {2,
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{ OID_BYTEA, OID_INT2 },
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"get_host_dhcpid",
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"SELECT h.host_id, h.dhcp_identifier, h.dhcp_identifier_type, "
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@@ -1417,7 +1384,7 @@ PgSqlTaggedStatement tagged_statements[] = {
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// are returned due to left joining IPv6 reservations and DHCPv6 options.
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// The number of rows returned is multiplication of number of existing
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// IPv6 reservations and DHCPv6 options.
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- {2,
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+ {2,
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{ OID_VARCHAR, OID_INT2 },
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"get_host_prefix",
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"SELECT h.host_id, h.dhcp_identifier, "
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@@ -1439,14 +1406,59 @@ PgSqlTaggedStatement tagged_statements[] = {
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//PgSqlHostDataSourceImpl::GET_VERSION
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// Retrieves MySQL schema version.
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- {0,
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+ {0,
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{ OID_NONE },
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"get_version",
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"SELECT version, minor FROM schema_version"
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},
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- // Marks the end of the statements table.
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- {0, { 0 }, NULL, NULL}
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+ // PgSqlHostDataSourceImpl::INSERT_HOST
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+ // Inserts a host into the 'hosts' table. Returns the inserted host id.
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+ {8,
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+ { OID_BYTEA, OID_INT2,
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+ OID_INT4, OID_INT4, OID_INT8, OID_VARCHAR,
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+ OID_VARCHAR, OID_VARCHAR },
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+ "insert_host",
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+ "INSERT INTO hosts(dhcp_identifier, dhcp_identifier_type, "
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+ " dhcp4_subnet_id, dhcp6_subnet_id, ipv4_address, hostname, "
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+ " dhcp4_client_classes, dhcp6_client_classes) "
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+ "VALUES ($1, $2, $3, $4, $5, $6, $7, $8) RETURNING host_id"
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+ },
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+
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+ //PgSqlHostDataSourceImpl::INSERT_V6_RESRV
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+ // Inserts a single IPv6 reservation into 'reservations' table.
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+ {5,
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+ { OID_VARCHAR, OID_INT2, OID_INT4, OID_INT4, OID_INT4 },
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+ "insert_v6_resrv",
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+ "INSERT INTO ipv6_reservations(address, prefix_len, type, "
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+ " dhcp6_iaid, host_id) "
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+ "VALUES ($1, $2, $3, $4, $5)"
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+ },
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+
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+ // PgSqlHostDataSourceImpl::INSERT_V4_HOST_OPTION
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+ // Inserts a single DHCPv4 option into 'dhcp4_options' table.
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+ // Using fixed scope_id = 3, which associates an option with host.
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+ {6,
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+ { OID_INT2, OID_BYTEA, OID_TEXT,
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+ OID_VARCHAR, OID_BOOL, OID_INT8},
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+ "insert_v4_host_option",
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+ "INSERT INTO dhcp4_options(code, value, formatted_value, space, "
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+ " persistent, host_id, scope_id) "
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+ "VALUES ($1, $2, $3, $4, $5, $6, 3)"
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+ },
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+
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+ // PgSqlHostDataSourceImpl::INSERT_V6_HOST_OPTION
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+ // Inserts a single DHCPv6 option into 'dhcp6_options' table.
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+ // Using fixed scope_id = 3, which associates an option with host.
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+ {6,
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+ { OID_INT2, OID_BYTEA, OID_TEXT,
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+ OID_VARCHAR, OID_BOOL, OID_INT8},
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+ "insert_v6_host_option",
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+ "INSERT INTO dhcp6_options(code, value, formatted_value, space, "
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+ " persistent, host_id, scope_id) "
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+ "VALUES ($1, $2, $3, $4, $5, $6, 3)"
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+ }
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+}
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};
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}; // end anonymous namespace
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@@ -1459,20 +1471,37 @@ PgSqlHostDataSourceImpl(const PgSqlConnection::ParameterMap& parameters)
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DHCP4_AND_DHCP6)),
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host_ipv6_reservation_exchange_(new PgSqlIPv6ReservationExchange()),
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host_option_exchange_(new PgSqlOptionExchange()),
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- conn_(parameters) {
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+ conn_(parameters),
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+ is_readonly_(false) {
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// Open the database.
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conn_.openDatabase();
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- int i = 0;
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- for( ; tagged_statements[i].text != NULL ; ++i) {
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- conn_.prepareStatement(tagged_statements[i]);
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+ conn_.prepareStatements(tagged_statements.begin(),
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+ tagged_statements.begin() + WRITE_STMTS_BEGIN);
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+
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+ std::string readonly_value = "false";
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+ try {
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+ readonly_value = conn_.getParameter("readonly");
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+ boost::algorithm::to_lower(readonly_value);
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+ } catch (...) {
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+ // Parameter "readonly" hasn't been specified so we simply use
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+ // the default value of "false".
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+ }
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+
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+ if (readonly_value == "true") {
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+ is_readonly_ = true;
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+
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+ } else if (readonly_value != "false") {
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+ isc_throw(DbInvalidReadOnly, "invalid value '" << readonly_value
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+ << "' specified for boolean parameter 'readonly'");
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}
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- // Just in case somebody foo-barred things
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- if (i != NUM_STATEMENTS) {
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- isc_throw(DbOpenError, "Number of statements prepared: " << i
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- << " does not match expected count:" << NUM_STATEMENTS);
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+ // If we are using read-write mode for the database we also prepare
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+ // statements for INSERTS etc.
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+ if (!is_readonly_) {
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+ conn_.prepareStatements(tagged_statements.begin() + WRITE_STMTS_BEGIN,
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+ tagged_statements.end());
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}
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}
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@@ -1637,11 +1666,14 @@ std::pair<uint32_t, uint32_t> PgSqlHostDataSourceImpl::getVersion() const {
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PgSqlHostDataSource::
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PgSqlHostDataSource(const PgSqlConnection::ParameterMap& parameters)
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- : impl_(new PgSqlHostDataSourceImpl(parameters)) {
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+ : impl_(new PgSqlHostDataSourceImpl(parameters),
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+ "PostgreSQL host database backend is configured to"
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+ " operate in read only mode") {
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+ impl_.allowConstOnly(impl_->is_readonly_);
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}
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PgSqlHostDataSource::~PgSqlHostDataSource() {
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- delete impl_;
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+ delete impl_.getPtr();
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}
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void
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@@ -1894,5 +1926,16 @@ std::pair<uint32_t, uint32_t> PgSqlHostDataSource::getVersion() const {
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return(impl_->getVersion());
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}
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+void
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+PgSqlHostDataSource::commit() {
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+ impl_->conn_.commit();
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+}
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+
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+
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+void
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+PgSqlHostDataSource::rollback() {
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+ impl_->conn_.rollback();
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+}
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+
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}; // end of isc::dhcp namespace
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}; // end of isc namespace
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