Fold PQsetenv working state into PGconn, rather than trying to maintain
it in a separate object. There's no value in keeping the state separate, and it creates dangling-pointer problems. Also, remove PQsetenv routines from public API, until and unless they are redesigned to have a safer interface. Since they were never part of the documented API before 7.0, it's unlikely that anyone is calling them.
This commit is contained in:
Tom Lane
parent
5b1f92eaa7
commit
0edcee3459
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@ -629,63 +629,6 @@ int PQbackendPID(const PGconn *conn);
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server host, not the local host!
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</para>
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</listitem>
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<listitem>
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<para>
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<function>PQsetenvStart</function>
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<function>PQsetenvPoll</function>
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<function>PQsetenvAbort</function>
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Perform an environment negotiation.
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<synopsis>
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PGsetenvHandle *PQsetenvStart(PGconn *conn)
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</synopsis>
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<synopsis>
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PostgresPollingStatusType *PQsetenvPoll(PGsetenvHandle handle)
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</synopsis>
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<synopsis>
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void PQsetenvAbort(PGsetenvHandle handle)
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</synopsis>
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These two routines can be used to re-perform the environment negotiation
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that occurs during the opening of a connection to a database
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server. I have
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no idea why this might be useful (XXX anyone?) but it might prove useful
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for users to be able to reconfigure their character encodings
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on-the-fly, for example.
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</para>
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<para>
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These functions will not block, subject to the restrictions applied to
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PQconnectStart and PQconnectPoll.
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</para>
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<para>
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To begin, call handle=PQsetenvStart(conn), where conn is an open connection
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to the database server. If handle is NULL, then libpq has been unable to
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allocate a new PGsetenvHandle structure. Otherwise, a valid handle is
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returned. This handle is intended to be opaque - you may only use it to
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call other functions in libpq (PQsetenvPoll, for example).
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</para>
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<para>
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Poll the procedure using PQsetenvPoll, in exactly the same way as you would
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create a connection using PQconnectPoll.
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</para>
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<para>
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The procedure may be aborted at any time by calling PQsetenvAbort(handle).
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</para>
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</listitem>
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<listitem>
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<para>
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<function>PQsetenv</function>
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Perform an environment negotiation.
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<synopsis>
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int PQsetenv(PGconn *conn)
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</synopsis>
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This function performs the same duties as PQsetenvStart and
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PQsetenvPoll, but
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blocks to do so. It returns 1 on success and 0 on failure.
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</para>
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</listitem>
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</itemizedlist>
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</para>
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</sect1>
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-connect.c,v 1.124 2000/03/23 17:27:29 momjian Exp $
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* $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-connect.c,v 1.125 2000/03/24 01:39:55 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -55,29 +55,6 @@ static int inet_aton(const char *cp, struct in_addr *inp) {
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}
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#endif
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/* ----------
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* pg_setenv_state
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* A struct used when polling a setenv request. This is referred to externally
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* using a PGsetenvHandle.
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* ----------
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*/
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struct pg_setenv_state
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{
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enum
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{
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SETENV_STATE_OPTION_SEND, /* About to send an Environment Option */
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SETENV_STATE_OPTION_WAIT, /* Waiting for above send to complete */
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#ifdef MULTIBYTE
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SETENV_STATE_ENCODINGS_SEND, /* About to send an "encodings" query */
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SETENV_STATE_ENCODINGS_WAIT, /* Waiting for query to complete */
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#endif
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SETENV_STATE_OK,
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SETENV_STATE_FAILED
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} state;
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PGconn *conn;
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PGresult *res;
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const struct EnvironmentOptions *eo;
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} ;
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#ifdef USE_SSL
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static SSL_CTX *SSL_context = NULL;
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@ -181,6 +158,8 @@ static const struct EnvironmentOptions
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static int connectDBStart(PGconn *conn);
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static int connectDBComplete(PGconn *conn);
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static bool PQsetenvStart(PGconn *conn);
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static PostgresPollingStatusType PQsetenvPoll(PGconn *conn);
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static PGconn *makeEmptyPGconn(void);
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static void freePGconn(PGconn *conn);
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static void closePGconn(PGconn *conn);
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@ -1313,8 +1292,7 @@ PQconnectPoll(PGconn *conn)
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* Post-connection housekeeping. Prepare to send environment
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* variables to server.
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*/
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if ((conn->setenv_handle = PQsetenvStart(conn)) == NULL)
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if (! PQsetenvStart(conn))
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goto error_return;
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conn->status = CONNECTION_SETENV;
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@ -1377,34 +1355,23 @@ error_return:
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*
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* ----------------
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*/
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PGsetenvHandle
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static bool
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PQsetenvStart(PGconn *conn)
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{
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struct pg_setenv_state *handle;
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if (conn == NULL || conn->status == CONNECTION_BAD)
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return NULL;
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if ((handle = malloc(sizeof(struct pg_setenv_state))) == NULL)
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{
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printfPQExpBuffer(&conn->errorMessage,
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"PQsetenvStart() -- malloc error - %s\n",
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strerror(errno));
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return NULL;
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}
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handle->conn = conn;
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handle->res = NULL;
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handle->eo = EnvironmentOptions;
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if (conn == NULL ||
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conn->status == CONNECTION_BAD ||
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conn->setenv_state != SETENV_STATE_IDLE)
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return false;
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#ifdef MULTIBYTE
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handle->state = SETENV_STATE_ENCODINGS_SEND;
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conn->setenv_state = SETENV_STATE_ENCODINGS_SEND;
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#else
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handle->state = SETENV_STATE_OPTION_SEND;
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conn->setenv_state = SETENV_STATE_OPTION_SEND;
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#endif
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return handle; /* Note that a struct pg_setenv_state * is the same as a
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PGsetenvHandle */
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conn->next_eo = EnvironmentOptions;
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return true;
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}
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/* ----------------
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@ -1415,19 +1382,19 @@ PQsetenvStart(PGconn *conn)
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*
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* ----------------
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*/
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PostgresPollingStatusType
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static PostgresPollingStatusType
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PQsetenvPoll(PGconn *conn)
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{
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PGsetenvHandle handle = conn->setenv_handle;
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PGresult *res;
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#ifdef MULTIBYTE
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static const char envname[] = "PGCLIENTENCODING";
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#endif
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if (!handle || handle->state == SETENV_STATE_FAILED)
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if (conn == NULL || conn->status == CONNECTION_BAD)
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return PGRES_POLLING_FAILED;
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/* Check whether there are any data for us */
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switch (handle->state)
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switch (conn->setenv_state)
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{
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/* These are reading states */
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#ifdef MULTIBYTE
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@ -1436,7 +1403,7 @@ PQsetenvPoll(PGconn *conn)
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case SETENV_STATE_OPTION_WAIT:
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{
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/* Load waiting data */
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int n = pqReadData(handle->conn);
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int n = pqReadData(conn);
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if (n < 0)
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goto error_return;
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@ -1452,9 +1419,13 @@ PQsetenvPoll(PGconn *conn)
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#endif
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case SETENV_STATE_OPTION_SEND:
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break;
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/* Should we raise an error if called when not active? */
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case SETENV_STATE_IDLE:
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return PGRES_POLLING_OK;
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default:
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printfPQExpBuffer(&handle->conn->errorMessage,
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printfPQExpBuffer(&conn->errorMessage,
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"PQsetenvPoll() -- unknown state - "
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"probably indicative of memory corruption!\n");
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goto error_return;
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@ -1463,7 +1434,7 @@ PQsetenvPoll(PGconn *conn)
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keep_going: /* We will come back to here until there is nothing left to
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parse. */
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switch(handle->state)
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switch(conn->setenv_state)
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{
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#ifdef MULTIBYTE
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@ -1475,39 +1446,39 @@ PQsetenvPoll(PGconn *conn)
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env = getenv(envname);
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if (!env || *env == '\0')
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{
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if (!PQsendQuery(handle->conn,
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if (!PQsendQuery(conn,
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"select getdatabaseencoding()"))
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goto error_return;
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handle->state = SETENV_STATE_ENCODINGS_WAIT;
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conn->setenv_state = SETENV_STATE_ENCODINGS_WAIT;
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return PGRES_POLLING_READING;
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}
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}
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case SETENV_STATE_ENCODINGS_WAIT:
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{
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if (PQisBusy(handle->conn))
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if (PQisBusy(conn))
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return PGRES_POLLING_READING;
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handle->res = PQgetResult(handle->conn);
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res = PQgetResult(conn);
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if (handle->res)
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if (res)
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{
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char *encoding;
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if (PQresultStatus(handle->res) != PGRES_TUPLES_OK)
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if (PQresultStatus(res) != PGRES_TUPLES_OK)
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{
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PQclear(handle->res);
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PQclear(res);
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goto error_return;
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}
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encoding = PQgetvalue(handle->res, 0, 0);
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/* set client encoding in pg_conn struct */
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encoding = PQgetvalue(res, 0, 0);
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if (!encoding) /* this should not happen */
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conn->client_encoding = SQL_ASCII;
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else
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/* set client encoding to pg_conn struct */
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conn->client_encoding = pg_char_to_encoding(encoding);
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PQclear(handle->res);
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PQclear(res);
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/* We have to keep going in order to clear up the query */
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goto keep_going;
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}
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@ -1515,7 +1486,7 @@ PQsetenvPoll(PGconn *conn)
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/* NULL result indicates that the query is finished */
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/* Move on to setting the environment options */
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handle->state = SETENV_STATE_OPTION_SEND;
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conn->setenv_state = SETENV_STATE_OPTION_SEND;
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goto keep_going;
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}
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#endif
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@ -1525,36 +1496,36 @@ PQsetenvPoll(PGconn *conn)
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/* Send an Environment Option */
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char setQuery[100]; /* note length limits in sprintf's below */
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if (handle->eo->envName)
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if (conn->next_eo->envName)
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{
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const char *val;
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if ((val = getenv(handle->eo->envName)))
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if ((val = getenv(conn->next_eo->envName)))
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{
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if (strcasecmp(val, "default") == 0)
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sprintf(setQuery, "SET %s = %.60s",
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handle->eo->pgName, val);
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conn->next_eo->pgName, val);
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else
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sprintf(setQuery, "SET %s = '%.60s'",
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handle->eo->pgName, val);
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conn->next_eo->pgName, val);
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#ifdef CONNECTDEBUG
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printf("Use environment variable %s to send %s\n",
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handle->eo->envName, setQuery);
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conn->next_eo->envName, setQuery);
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#endif
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if (!PQsendQuery(handle->conn, setQuery))
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if (!PQsendQuery(conn, setQuery))
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goto error_return;
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handle->state = SETENV_STATE_OPTION_WAIT;
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conn->setenv_state = SETENV_STATE_OPTION_WAIT;
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||||
}
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||||
else
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{
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||||
handle->eo++;
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conn->next_eo++;
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||||
}
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||||
}
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||||
else
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||||
{
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||||
/* No option to send, so we are done. */
|
||||
handle->state = SETENV_STATE_OK;
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/* No more options to send, so we are done. */
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||||
conn->setenv_state = SETENV_STATE_IDLE;
|
||||
}
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||||
|
||||
goto keep_going;
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||||
|
|
@ -1562,20 +1533,20 @@ PQsetenvPoll(PGconn *conn)
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|||
|
||||
case SETENV_STATE_OPTION_WAIT:
|
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{
|
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if (PQisBusy(handle->conn))
|
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if (PQisBusy(conn))
|
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return PGRES_POLLING_READING;
|
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|
||||
handle->res = PQgetResult(handle->conn);
|
||||
res = PQgetResult(conn);
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||||
|
||||
if (handle->res)
|
||||
if (res)
|
||||
{
|
||||
if (PQresultStatus(handle->res) != PGRES_COMMAND_OK)
|
||||
if (PQresultStatus(res) != PGRES_COMMAND_OK)
|
||||
{
|
||||
PQclear(handle->res);
|
||||
PQclear(res);
|
||||
goto error_return;
|
||||
}
|
||||
/* Don't need the result */
|
||||
PQclear(handle->res);
|
||||
PQclear(res);
|
||||
/* We have to keep going in order to clear up the query */
|
||||
goto keep_going;
|
||||
}
|
||||
|
|
@ -1583,18 +1554,16 @@ PQsetenvPoll(PGconn *conn)
|
|||
/* NULL result indicates that the query is finished */
|
||||
|
||||
/* Send the next option */
|
||||
handle->eo++;
|
||||
handle->state = SETENV_STATE_OPTION_SEND;
|
||||
conn->next_eo++;
|
||||
conn->setenv_state = SETENV_STATE_OPTION_SEND;
|
||||
goto keep_going;
|
||||
}
|
||||
|
||||
case SETENV_STATE_OK:
|
||||
/* Tidy up */
|
||||
free(handle);
|
||||
case SETENV_STATE_IDLE:
|
||||
return PGRES_POLLING_OK;
|
||||
|
||||
default:
|
||||
printfPQExpBuffer(&handle->conn->errorMessage,
|
||||
printfPQExpBuffer(&conn->errorMessage,
|
||||
"PQsetenvPoll() -- unknown state - "
|
||||
"probably indicative of memory corruption!\n");
|
||||
goto error_return;
|
||||
|
|
@ -1603,34 +1572,12 @@ PQsetenvPoll(PGconn *conn)
|
|||
/* Unreachable */
|
||||
|
||||
error_return:
|
||||
handle->state = SETENV_STATE_FAILED; /* This may protect us even if we
|
||||
* are called after the handle
|
||||
* has been freed. */
|
||||
free(handle);
|
||||
conn->setenv_state = SETENV_STATE_IDLE;
|
||||
return PGRES_POLLING_FAILED;
|
||||
}
|
||||
|
||||
|
||||
/* ----------------
|
||||
* PQsetenvAbort
|
||||
*
|
||||
* Aborts the process of passing the values of a standard set of environment
|
||||
* variables to the backend.
|
||||
*
|
||||
* ----------------
|
||||
*/
|
||||
void
|
||||
PQsetenvAbort(PGsetenvHandle handle)
|
||||
{
|
||||
/* We should not have been called in the FAILED state, but we can cope by
|
||||
* not freeing the handle (it has probably been freed by now anyway). */
|
||||
if (handle->state != SETENV_STATE_FAILED)
|
||||
{
|
||||
handle->state = SETENV_STATE_FAILED;
|
||||
free(handle);
|
||||
}
|
||||
}
|
||||
|
||||
#ifdef NOT_USED
|
||||
|
||||
/* ----------------
|
||||
* PQsetenv
|
||||
|
|
@ -1638,22 +1585,20 @@ PQsetenvAbort(PGsetenvHandle handle)
|
|||
* Passes the values of a standard set of environment variables to the
|
||||
* backend.
|
||||
*
|
||||
* Returns 1 on success, 0 on failure.
|
||||
*
|
||||
* This function used to return void. I don't think that there should be
|
||||
* compatibility problems caused by giving it a return value, especially as
|
||||
* this function has not been documented previously.
|
||||
* Returns true on success, false on failure.
|
||||
*
|
||||
* This function used to be exported for no particularly good reason.
|
||||
* Since it's no longer used by libpq itself, let's try #ifdef'ing it out
|
||||
* and see if anyone complains.
|
||||
* ----------------
|
||||
*/
|
||||
int
|
||||
static bool
|
||||
PQsetenv(PGconn *conn)
|
||||
{
|
||||
PGsetenvHandle handle;
|
||||
PostgresPollingStatusType flag = PGRES_POLLING_WRITING;
|
||||
|
||||
if ((handle = PQsetenvStart(conn)) == NULL)
|
||||
return 0;
|
||||
if (! PQsetenvStart(conn))
|
||||
return false;
|
||||
|
||||
for (;;) {
|
||||
/*
|
||||
|
|
@ -1666,13 +1611,13 @@ PQsetenv(PGconn *conn)
|
|||
break;
|
||||
|
||||
case PGRES_POLLING_OK:
|
||||
return 1; /* success! */
|
||||
return true; /* success! */
|
||||
|
||||
case PGRES_POLLING_READING:
|
||||
if (pqWait(1, 0, conn))
|
||||
{
|
||||
conn->status = CONNECTION_BAD;
|
||||
return 0;
|
||||
return false;
|
||||
}
|
||||
break;
|
||||
|
||||
|
|
@ -1680,14 +1625,14 @@ PQsetenv(PGconn *conn)
|
|||
if (pqWait(0, 1, conn))
|
||||
{
|
||||
conn->status = CONNECTION_BAD;
|
||||
return 0;
|
||||
return false;
|
||||
}
|
||||
break;
|
||||
|
||||
default:
|
||||
/* Just in case we failed to set it in PQsetenvPoll */
|
||||
conn->status = CONNECTION_BAD;
|
||||
return 0;
|
||||
return false;
|
||||
}
|
||||
/*
|
||||
* Now try to advance the state machine.
|
||||
|
|
@ -1696,6 +1641,9 @@ PQsetenv(PGconn *conn)
|
|||
}
|
||||
}
|
||||
|
||||
#endif /* NOT_USED */
|
||||
|
||||
|
||||
/*
|
||||
* makeEmptyPGconn
|
||||
* - create a PGconn data structure with (as yet) no interesting data
|
||||
|
|
@ -1714,6 +1662,7 @@ makeEmptyPGconn(void)
|
|||
conn->noticeHook = defaultNoticeProcessor;
|
||||
conn->status = CONNECTION_BAD;
|
||||
conn->asyncStatus = PGASYNC_IDLE;
|
||||
conn->setenv_state = SETENV_STATE_IDLE;
|
||||
conn->notifyList = DLNewList();
|
||||
conn->sock = -1;
|
||||
#ifdef USE_SSL
|
||||
|
|
@ -1808,12 +1757,6 @@ freePGconn(PGconn *conn)
|
|||
static void
|
||||
closePGconn(PGconn *conn)
|
||||
{
|
||||
if (conn->status == CONNECTION_SETENV)
|
||||
{
|
||||
/* We have to abort the setenv process as well */
|
||||
PQsetenvAbort(conn->setenv_handle);
|
||||
}
|
||||
|
||||
if (conn->sock >= 0)
|
||||
{
|
||||
|
||||
|
|
|
|||
|
|
@ -7,7 +7,7 @@
|
|||
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $Id: libpq-fe.h,v 1.62 2000/03/23 15:00:11 momjian Exp $
|
||||
* $Id: libpq-fe.h,v 1.63 2000/03/24 01:39:55 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -86,12 +86,6 @@ extern "C"
|
|||
*/
|
||||
typedef struct pg_result PGresult;
|
||||
|
||||
/* PGsetenvHandle is an opaque handle which is returned by PQsetenvStart and
|
||||
* which should be passed to PQsetenvPoll or PQsetenvAbort in order to refer
|
||||
* to the particular process being performed.
|
||||
*/
|
||||
typedef struct pg_setenv_state *PGsetenvHandle;
|
||||
|
||||
/* PGnotify represents the occurrence of a NOTIFY message.
|
||||
* Ideally this would be an opaque typedef, but it's so simple that it's
|
||||
* unlikely to change.
|
||||
|
|
@ -231,15 +225,6 @@ extern "C"
|
|||
/* Override default notice processor */
|
||||
extern PQnoticeProcessor PQsetNoticeProcessor(PGconn *conn, PQnoticeProcessor proc, void *arg);
|
||||
|
||||
/* Passing of environment variables */
|
||||
/* Asynchronous (non-blocking) */
|
||||
extern PGsetenvHandle PQsetenvStart(PGconn *conn);
|
||||
extern PostgresPollingStatusType PQsetenvPoll(PGconn *conn);
|
||||
extern void PQsetenvAbort(PGsetenvHandle handle);
|
||||
|
||||
/* Synchronous (blocking) */
|
||||
extern int PQsetenv(PGconn *conn);
|
||||
|
||||
/* === in fe-exec.c === */
|
||||
|
||||
/* Simple synchronous query */
|
||||
|
|
|
|||
|
|
@ -12,7 +12,7 @@
|
|||
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $Id: libpq-int.h,v 1.21 2000/03/14 23:59:23 tgl Exp $
|
||||
* $Id: libpq-int.h,v 1.22 2000/03/24 01:39:55 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -164,6 +164,17 @@ typedef enum
|
|||
PGASYNC_COPY_OUT /* Copy Out data transfer in progress */
|
||||
} PGAsyncStatusType;
|
||||
|
||||
/* PGSetenvStatusType defines the state of the PQSetenv state machine */
|
||||
typedef enum
|
||||
{
|
||||
SETENV_STATE_OPTION_SEND, /* About to send an Environment Option */
|
||||
SETENV_STATE_OPTION_WAIT, /* Waiting for above send to complete */
|
||||
/* these next two are only used in MULTIBYTE mode */
|
||||
SETENV_STATE_ENCODINGS_SEND, /* About to send an "encodings" query */
|
||||
SETENV_STATE_ENCODINGS_WAIT, /* Waiting for query to complete */
|
||||
SETENV_STATE_IDLE
|
||||
} PGSetenvStatusType;
|
||||
|
||||
/* large-object-access data ... allocated only if large-object code is used. */
|
||||
typedef struct pgLobjfuncs
|
||||
{
|
||||
|
|
@ -244,8 +255,9 @@ struct pg_conn
|
|||
PGresult *result; /* result being constructed */
|
||||
PGresAttValue *curTuple; /* tuple currently being read */
|
||||
|
||||
/* Handle for setenv request. Used during connection only. */
|
||||
PGsetenvHandle setenv_handle;
|
||||
/* Status for sending environment info. Used during PQSetenv only. */
|
||||
PGSetenvStatusType setenv_state;
|
||||
const struct EnvironmentOptions *next_eo;
|
||||
|
||||
#ifdef USE_SSL
|
||||
bool allow_ssl_try; /* Allowed to try SSL negotiation */
|
||||
|
|
|
|||
Loading…
Reference in New Issue