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/*
* Copyright 2004-2019 H2 Group. Multiple-Licensed under the MPL 2.0,
* and the EPL 1.0 (https://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.server.pg;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Timestamp;
import java.sql.Types;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.atomic.AtomicInteger;
import org.h2.api.ErrorCode;
import org.h2.engine.Constants;
import org.h2.message.DbException;
import org.h2.server.Service;
import org.h2.util.NetUtils;
import org.h2.util.NetUtils2;
import org.h2.util.Tool;
/**
* This class implements a subset of the PostgreSQL protocol as described here:
* http://developer.postgresql.org/pgdocs/postgres/protocol.html
* The PostgreSQL catalog is described here:
* http://www.postgresql.org/docs/7.4/static/catalogs.html
*
* @author Thomas Mueller
* @author Sergi Vladykin 2009-07-03 (convertType)
*/
public class PgServer implements Service {
/**
* The default port to use for the PG server.
* This value is also in the documentation and in the Server javadoc.
*/
public static final int DEFAULT_PORT = 5435;
/**
* The VARCHAR type.
*/
public static final int PG_TYPE_VARCHAR = 1043;
public static final int PG_TYPE_BOOL = 16;
public static final int PG_TYPE_BYTEA = 17;
public static final int PG_TYPE_BPCHAR = 1042;
public static final int PG_TYPE_INT8 = 20;
public static final int PG_TYPE_INT2 = 21;
public static final int PG_TYPE_INT4 = 23;
public static final int PG_TYPE_TEXT = 25;
public static final int PG_TYPE_OID = 26;
public static final int PG_TYPE_FLOAT4 = 700;
public static final int PG_TYPE_FLOAT8 = 701;
public static final int PG_TYPE_UNKNOWN = 705;
public static final int PG_TYPE_TEXTARRAY = 1009;
public static final int PG_TYPE_DATE = 1082;
public static final int PG_TYPE_TIME = 1083;
public static final int PG_TYPE_TIMESTAMP_NO_TMZONE = 1114;
public static final int PG_TYPE_NUMERIC = 1700;
private final HashSet typeSet = new HashSet<>();
private int port = PgServer.DEFAULT_PORT;
private boolean portIsSet;
private boolean stop;
private boolean trace;
private ServerSocket serverSocket;
private final Set running = Collections.
synchronizedSet(new HashSet());
private final AtomicInteger pid = new AtomicInteger();
private String baseDir;
private boolean allowOthers;
private boolean isDaemon;
private boolean ifExists = true;
private String key, keyDatabase;
@Override
public void init(String... args) {
port = DEFAULT_PORT;
for (int i = 0; args != null && i < args.length; i++) {
String a = args[i];
if (Tool.isOption(a, "-trace")) {
trace = true;
} else if (Tool.isOption(a, "-pgPort")) {
port = Integer.decode(args[++i]);
portIsSet = true;
} else if (Tool.isOption(a, "-baseDir")) {
baseDir = args[++i];
} else if (Tool.isOption(a, "-pgAllowOthers")) {
allowOthers = true;
} else if (Tool.isOption(a, "-pgDaemon")) {
isDaemon = true;
} else if (Tool.isOption(a, "-ifExists")) {
ifExists = true;
} else if (Tool.isOption(a, "-ifNotExists")) {
ifExists = false;
} else if (Tool.isOption(a, "-key")) {
key = args[++i];
keyDatabase = args[++i];
}
}
org.h2.Driver.load();
// int testing;
// trace = true;
}
boolean getTrace() {
return trace;
}
/**
* Print a message if the trace flag is enabled.
*
* @param s the message
*/
void trace(String s) {
if (trace) {
System.out.println(s);
}
}
/**
* Remove a thread from the list.
*
* @param t the thread to remove
*/
synchronized void remove(PgServerThread t) {
running.remove(t);
}
/**
* Print the stack trace if the trace flag is enabled.
*
* @param e the exception
*/
void traceError(Exception e) {
if (trace) {
e.printStackTrace();
}
}
@Override
public String getURL() {
return "pg://" + NetUtils.getLocalAddress() + ":" + port;
}
@Override
public int getPort() {
return port;
}
private boolean allow(Socket socket) {
if (allowOthers) {
return true;
}
try {
return NetUtils.isLocalAddress(socket);
} catch (UnknownHostException e) {
traceError(e);
return false;
}
}
@Override
public void start() {
stop = false;
try {
serverSocket = NetUtils.createServerSocket(port, false);
} catch (DbException e) {
if (!portIsSet) {
serverSocket = NetUtils.createServerSocket(0, false);
} else {
throw e;
}
}
port = serverSocket.getLocalPort();
}
@Override
public void listen() {
String threadName = Thread.currentThread().getName();
try {
while (!stop) {
Socket s = serverSocket.accept();
if (!allow(s)) {
trace("Connection not allowed");
s.close();
} else {
NetUtils2.setTcpQuickack(s, true);
PgServerThread c = new PgServerThread(s, this);
running.add(c);
int id = pid.incrementAndGet();
c.setProcessId(id);
Thread thread = new Thread(c, threadName + " thread-" + id);
thread.setDaemon(isDaemon);
c.setThread(thread);
thread.start();
}
}
} catch (Exception e) {
if (!stop) {
e.printStackTrace();
}
}
}
@Override
public void stop() {
// TODO server: combine with tcp server
if (!stop) {
stop = true;
if (serverSocket != null) {
try {
serverSocket.close();
} catch (IOException e) {
// TODO log exception
e.printStackTrace();
}
serverSocket = null;
}
}
// TODO server: using a boolean 'now' argument? a timeout?
for (PgServerThread c : new ArrayList<>(running)) {
c.close();
try {
Thread t = c.getThread();
if (t != null) {
t.join(100);
}
} catch (Exception e) {
// TODO log exception
e.printStackTrace();
}
}
}
@Override
public boolean isRunning(boolean traceError) {
if (serverSocket == null) {
return false;
}
try {
Socket s = NetUtils.createLoopbackSocket(serverSocket.getLocalPort(), false);
s.close();
return true;
} catch (Exception e) {
if (traceError) {
traceError(e);
}
return false;
}
}
/**
* Get the thread with the given process id.
*
* @param processId the process id
* @return the thread
*/
PgServerThread getThread(int processId) {
for (PgServerThread c : new ArrayList<>(running)) {
if (c.getProcessId() == processId) {
return c;
}
}
return null;
}
String getBaseDir() {
return baseDir;
}
@Override
public boolean getAllowOthers() {
return allowOthers;
}
@Override
public String getType() {
return "PG";
}
@Override
public String getName() {
return "H2 PG Server";
}
boolean getIfExists() {
return ifExists;
}
/**
* The Java implementation of the PostgreSQL function pg_get_indexdef. The
* method is used to get CREATE INDEX command for an index, or the column
* definition of one column in the index.
*
* @param conn the connection
* @param indexId the index id
* @param ordinalPosition the ordinal position (null if the SQL statement
* should be returned)
* @param pretty this flag is ignored
* @return the SQL statement or the column name
*/
@SuppressWarnings("unused")
public static String getIndexColumn(Connection conn, int indexId,
Integer ordinalPosition, Boolean pretty) throws SQLException {
if (ordinalPosition == null || ordinalPosition == 0) {
PreparedStatement prep = conn.prepareStatement(
"select sql from information_schema.indexes where id=?");
prep.setInt(1, indexId);
ResultSet rs = prep.executeQuery();
if (rs.next()) {
return rs.getString(1);
}
return "";
}
PreparedStatement prep = conn.prepareStatement(
"select column_name from information_schema.indexes " +
"where id=? and ordinal_position=?");
prep.setInt(1, indexId);
prep.setInt(2, ordinalPosition);
ResultSet rs = prep.executeQuery();
if (rs.next()) {
return rs.getString(1);
}
return "";
}
/**
* Get the OID of an object. This method is called by the database.
*
* @param conn the connection
* @param tableName the table name
* @return the oid
*/
public static int getOid(Connection conn, String tableName)
throws SQLException {
if (tableName.startsWith("\"") && tableName.endsWith("\"")) {
tableName = tableName.substring(1, tableName.length() - 1);
}
PreparedStatement prep = conn.prepareStatement(
"select oid from pg_class where relName = ?");
prep.setString(1, tableName);
ResultSet rs = prep.executeQuery();
if (!rs.next()) {
return 0;
}
return rs.getInt(1);
}
/**
* Get the name of this encoding code.
* This method is called by the database.
*
* @param code the encoding code
* @return the encoding name
*/
public static String getEncodingName(int code) {
switch (code) {
case 0:
return "SQL_ASCII";
case 6:
return "UTF8";
case 8:
return "LATIN1";
default:
return code < 40 ? "UTF8" : "";
}
}
/**
* Get the version. This method must return PostgreSQL to keep some clients
* happy. This method is called by the database.
*
* @return the server name and version
*/
public static String getVersion() {
return "PostgreSQL " + Constants.PG_VERSION + " server protocol using H2 " +
Constants.FULL_VERSION;
}
/**
* Get the current system time.
* This method is called by the database.
*
* @return the current system time
*/
public static Timestamp getStartTime() {
return new Timestamp(System.currentTimeMillis());
}
/**
* Get the user name for this id.
* This method is called by the database.
*
* @param conn the connection
* @param id the user id
* @return the user name
*/
public static String getUserById(Connection conn, int id) throws SQLException {
PreparedStatement prep = conn.prepareStatement(
"SELECT NAME FROM INFORMATION_SCHEMA.USERS WHERE ID=?");
prep.setInt(1, id);
ResultSet rs = prep.executeQuery();
if (rs.next()) {
return rs.getString(1);
}
return null;
}
/**
* Check if the this session has the given database privilege.
* This method is called by the database.
*
* @param id the session id
* @param privilege the privilege to check
* @return true
*/
@SuppressWarnings("unused")
public static boolean hasDatabasePrivilege(int id, String privilege) {
return true;
}
/**
* Check if the current session has access to this table.
* This method is called by the database.
*
* @param table the table name
* @param privilege the privilege to check
* @return true
*/
@SuppressWarnings("unused")
public static boolean hasTablePrivilege(String table, String privilege) {
return true;
}
/**
* Get the current transaction id.
* This method is called by the database.
*
* @param table the table name
* @param id the id
* @return 1
*/
@SuppressWarnings("unused")
public static int getCurrentTid(String table, String id) {
return 1;
}
/**
* A fake wrapper around pg_get_expr(expr_text, relation_oid), in PostgreSQL
* it "decompiles the internal form of an expression, assuming that any vars
* in it refer to the relation indicated by the second parameter".
*
* @param exprText the expression text
* @param relationOid the relation object id
* @return always null
*/
@SuppressWarnings("unused")
public static String getPgExpr(String exprText, int relationOid) {
return null;
}
/**
* Check if the current session has access to this table.
* This method is called by the database.
*
* @param conn the connection
* @param pgType the PostgreSQL type oid
* @param typeMod the type modifier (typically -1)
* @return the name of the given type
*/
public static String formatType(Connection conn, int pgType, int typeMod)
throws SQLException {
PreparedStatement prep = conn.prepareStatement(
"select typname from pg_catalog.pg_type where oid = ? and typtypmod = ?");
prep.setInt(1, pgType);
prep.setInt(2, typeMod);
ResultSet rs = prep.executeQuery();
if (rs.next()) {
return rs.getString(1);
}
return null;
}
/**
* Convert the SQL type to a PostgreSQL type
*
* @param type the SQL type
* @return the PostgreSQL type
*/
public static int convertType(final int type) {
switch (type) {
case Types.BOOLEAN:
return PG_TYPE_BOOL;
case Types.VARCHAR:
return PG_TYPE_VARCHAR;
case Types.CLOB:
return PG_TYPE_TEXT;
case Types.CHAR:
return PG_TYPE_BPCHAR;
case Types.SMALLINT:
return PG_TYPE_INT2;
case Types.INTEGER:
return PG_TYPE_INT4;
case Types.BIGINT:
return PG_TYPE_INT8;
case Types.DECIMAL:
return PG_TYPE_NUMERIC;
case Types.REAL:
return PG_TYPE_FLOAT4;
case Types.DOUBLE:
return PG_TYPE_FLOAT8;
case Types.TIME:
return PG_TYPE_TIME;
case Types.DATE:
return PG_TYPE_DATE;
case Types.TIMESTAMP:
return PG_TYPE_TIMESTAMP_NO_TMZONE;
case Types.VARBINARY:
return PG_TYPE_BYTEA;
case Types.BLOB:
return PG_TYPE_OID;
case Types.ARRAY:
return PG_TYPE_TEXTARRAY;
default:
return PG_TYPE_UNKNOWN;
}
}
/**
* Get the type hash set.
*
* @return the type set
*/
HashSet getTypeSet() {
return typeSet;
}
/**
* Check whether a data type is supported.
* A warning is logged if not.
*
* @param type the type
*/
void checkType(int type) {
if (!typeSet.contains(type)) {
trace("Unsupported type: " + type);
}
}
/**
* If no key is set, return the original database name. If a key is set,
* check if the key matches. If yes, return the correct database name. If
* not, throw an exception.
*
* @param db the key to test (or database name if no key is used)
* @return the database name
* @throws DbException if a key is set but doesn't match
*/
public String checkKeyAndGetDatabaseName(String db) {
if (key == null) {
return db;
}
if (key.equals(db)) {
return keyDatabase;
}
throw DbException.get(ErrorCode.WRONG_USER_OR_PASSWORD);
}
@Override
public boolean isDaemon() {
return isDaemon;
}
}
