1 | unit ORNet;
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2 |
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3 | //{$DEFINE CCOWBROKER}
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4 |
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5 | interface
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6 |
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7 | uses SysUtils, Windows, Classes, Forms, Controls, ORFn, TRPCB, RPCConf1, Dialogs
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8 | ; //, SharedRPCBroker;
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9 |
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10 |
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11 | procedure SetBrokerServer(const AName: string; APort: Integer; WantDebug: Boolean);
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12 | function AuthorizedOption(const OptionName: string): Boolean;
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13 | function ConnectToServer(const OptionName: string): Boolean;
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14 | function MRef(glvn: string): string;
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15 | procedure CallV(const RPCName: string; const AParam: array of const);
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16 | function sCallV(const RPCName: string; const AParam: array of const): string;
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17 | procedure tCallV(ReturnData: TStrings; const RPCName: string; const AParam: array of const);
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18 | function UpdateContext(NewContext: string): boolean;
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19 | function IsBaseContext: boolean;
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20 | procedure CallBrokerInContext;
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21 | procedure CallBroker;
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22 | function RetainedRPCCount: Integer;
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23 | procedure SetRetainedRPCMax(Value: Integer);
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24 | function GetRPCMax: integer;
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25 | procedure LoadRPCData(Dest: TStrings; ID: Integer);
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26 | function DottedIPStr: string;
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27 | procedure CallRPCWhenIdle(CallProc: TORIdleCallProc; Msg: String);
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28 | function ShowRPCList: Boolean;
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29 |
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30 | procedure EnsureBroker;
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31 |
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32 | (*
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33 | function pCallV(const RPCName: string; const AParam: array of const): PChar;
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34 | procedure wCallV(AControl: TControl; const RPCName: string; const AParam: array of const);
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35 | procedure WrapWP(Buf: pChar);
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36 | *)
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37 |
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38 | var
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39 | RPCBrokerV: TRPCBroker;
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40 | RPCLastCall: string;
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41 |
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42 | AppStartedCursorForm: TForm = nil;
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43 |
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44 | implementation
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45 |
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46 | uses Winsock;
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47 |
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48 | const
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49 | // *** these are constants from RPCBErr.pas, will broker document them????
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50 | XWB_M_REJECT = 20000 + 2; // M error
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51 | XWB_BadSignOn = 20000 + 4; // SignOn 'Error' (happens when cancel pressed)
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52 |
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53 | var
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54 | uCallList: TList;
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55 | uMaxCalls: Integer;
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56 | uShowRPCs: Boolean;
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57 | uBaseContext: string = '';
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58 | uCurrentContext: string = '';
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59 |
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60 | { private procedures and functions ---------------------------------------------------------- }
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61 |
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62 | procedure EnsureBroker;
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63 | { ensures that a broker object has been created - creates & initializes it if necessary }
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64 | begin
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65 | if RPCBrokerV = nil then
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66 | begin
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67 | RPCBrokerV := TRPCBroker.Create(Application);
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68 | with RPCBrokerV do
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69 | begin
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70 | KernelLogIn := True;
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71 | Login.Mode := lmAppHandle;
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72 | ClearParameters := True;
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73 | ClearResults := True;
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74 | DebugMode := False;
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75 | end;
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76 | end;
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77 | end;
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78 |
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79 | procedure SetList(AStringList: TStrings; ParamIndex: Integer);
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80 | { places TStrings into RPCBrokerV.Mult[n], where n is a 1-based (not 0-based) index }
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81 | var
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82 | i: Integer;
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83 | begin
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84 | with RPCBrokerV.Param[ParamIndex] do
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85 | begin
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86 | PType := list;
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87 | with AStringList do for i := 0 to Count - 1 do Mult[IntToStr(i+1)] := Strings[i];
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88 | end;
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89 | end;
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90 |
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91 | procedure SetParams(const RPCName: string; const AParam: array of const);
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92 | { takes the params (array of const) passed to xCallV and sets them into RPCBrokerV.Param[i] }
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93 | const
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94 | BoolChar: array[boolean] of char = ('0', '1');
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95 | var
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96 | i: integer;
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97 | TmpExt: Extended;
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98 | begin
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99 | RPCLastCall := RPCName + ' (SetParam begin)';
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100 | if Length(RPCName) = 0 then raise Exception.Create('No RPC Name');
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101 | EnsureBroker;
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102 | with RPCBrokerV do
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103 | begin
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104 | ClearParameters := True;
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105 | RemoteProcedure := RPCName;
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106 | for i := 0 to High(AParam) do with AParam[i] do
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107 | begin
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108 | Param[i].PType := literal;
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109 | case VType of
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110 | vtInteger: Param[i].Value := IntToStr(VInteger);
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111 | vtBoolean: Param[i].Value := BoolChar[VBoolean];
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112 | vtChar: if VChar = #0 then
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113 | Param[i].Value := ''
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114 | else
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115 | Param[i].Value := VChar;
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116 | //vtExtended: Param[i].Value := FloatToStr(VExtended^);
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117 | vtExtended: begin
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118 | TmpExt := VExtended^;
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119 | if(abs(TmpExt) < 0.0000000000001) then TmpExt := 0;
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120 | Param[i].Value := FloatToStr(TmpExt);
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121 | end;
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122 | vtString: with Param[i] do
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123 | begin
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124 | Value := VString^;
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125 | if (Length(Value) > 0) and (Value[1] = #1) then
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126 | begin
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127 | Value := Copy(Value, 2, Length(Value));
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128 | PType := reference;
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129 | end;
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130 | end;
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131 | vtPChar: Param[i].Value := StrPas(VPChar);
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132 | vtPointer: if VPointer = nil
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133 | then ClearParameters := True {Param[i].PType := null}
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134 | else raise Exception.Create('Pointer type must be nil.');
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135 | vtObject: if VObject is TStrings then SetList(TStrings(VObject), i);
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136 | vtAnsiString: with Param[i] do
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137 | begin
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138 | Value := string(VAnsiString);
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139 | if (Length(Value) > 0) and (Value[1] = #1) then
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140 | begin
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141 | Value := Copy(Value, 2, Length(Value));
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142 | PType := reference;
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143 | end;
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144 | end;
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145 | vtInt64: Param[i].Value := IntToStr(VInt64^);
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146 | else raise Exception.Create('Unable to pass parameter type to Broker.');
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147 | end; {case}
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148 | end; {for}
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149 | end; {with}
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150 | RPCLastCall := RPCName + ' (SetParam end)';
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151 | end;
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152 |
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153 | { public procedures and functions ----------------------------------------------------------- }
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154 |
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155 | function UpdateContext(NewContext: string): boolean;
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156 | begin
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157 | if NewContext = uCurrentContext then
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158 | Result := TRUE
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159 | else
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160 | begin
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161 | Result := RPCBrokerV.CreateContext(NewContext);
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162 | if Result then
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163 | uCurrentContext := NewContext
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164 | else
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165 | if (NewContext <> uBaseContext) and RPCBrokerV.CreateContext(uBaseContext) then
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166 | uCurrentContext := uBaseContext
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167 | else
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168 | uCurrentContext := '';
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169 | end;
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170 | end;
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171 |
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172 | function IsBaseContext: boolean;
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173 | begin
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174 | Result := ((uCurrentContext = uBaseContext) or (uCurrentContext = ''));
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175 | end;
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176 |
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177 | procedure CallBrokerInContext;
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178 | var
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179 | AStringList: TStringList;
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180 | i, j: Integer;
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181 | x, y: string;
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182 | begin
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183 | RPCLastCall := RPCBrokerV.RemoteProcedure + ' (CallBroker begin)';
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184 | if uShowRPCs then StatusText(RPCBrokerV.RemoteProcedure);
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185 | with RPCBrokerV do if not Connected then // happens if broker connection is lost
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186 | begin
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187 | ClearResults := True;
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188 | Exit;
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189 | end;
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190 | if uCallList.Count = uMaxCalls then
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191 | begin
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192 | AStringList := uCallList.Items[0];
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193 | AStringList.Free;
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194 | uCallList.Delete(0);
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195 | end;
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196 | AStringList := TStringList.Create;
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197 | AStringList.Add(RPCBrokerV.RemoteProcedure);
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198 | if uCurrentContext <> uBaseContext then
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199 | AStringList.Add('Context: ' + uCurrentContext);
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200 | AStringList.Add(' ');
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201 | AStringList.Add('Params ------------------------------------------------------------------');
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202 | with RPCBrokerV do for i := 0 to Param.Count - 1 do
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203 | begin
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204 | case Param[i].PType of
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205 | //global: x := 'global';
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206 | list: x := 'list';
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207 | literal: x := 'literal';
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208 | //null: x := 'null';
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209 | reference: x := 'reference';
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210 | undefined: x := 'undefined';
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211 | //wordproc: x := 'wordproc';
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212 | end;
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213 | AStringList.Add(x + #9 + Param[i].Value);
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214 | if Param[i].PType = list then
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215 | begin
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216 | for j := 0 to Param[i].Mult.Count - 1 do
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217 | begin
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218 | x := Param[i].Mult.Subscript(j);
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219 | y := Param[i].Mult[x];
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220 | AStringList.Add(#9 + '(' + x + ')=' + y);
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221 | end;
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222 | end;
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223 | end; {with...for}
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224 | //RPCBrokerV.Call;
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225 | try
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226 | RPCBrokerV.Call;
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227 | except
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228 | // The broker erroneously sets connected to false if there is any error (including an
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229 | // error on the M side). It should only set connection to false if there is no connection.
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230 | on E:EBrokerError do
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231 | begin
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232 | if E.Code = XWB_M_REJECT then
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233 | begin
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234 | x := 'An error occurred on the server.' + CRLF + CRLF + E.Action;
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235 | Application.MessageBox(PChar(x), 'Server Error', MB_OK);
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236 | end
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237 | else raise;
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238 | (*
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239 | case E.Code of
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240 | XWB_M_REJECT: begin
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241 | x := 'An error occurred on the server.' + CRLF + CRLF + E.Action;
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242 | Application.MessageBox(PChar(x), 'Server Error', MB_OK);
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243 | end;
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244 | else begin
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245 | x := 'An error occurred with the network connection.' + CRLF +
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246 | 'Action was: ' + E.Action + CRLF + 'Code was: ' + E.Mnemonic +
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247 | CRLF + CRLF + 'Application cannot continue.';
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248 | Application.MessageBox(PChar(x), 'Network Error', MB_OK);
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249 | end;
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250 | end;
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251 | *)
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252 | // make optional later...
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253 | if not RPCBrokerV.Connected then Application.Terminate;
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254 | end;
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255 | end;
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256 | AStringList.Add(' ');
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257 | AStringList.Add('Results -----------------------------------------------------------------');
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258 | FastAddStrings(RPCBrokerV.Results, AStringList);
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259 | uCallList.Add(AStringList);
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260 | if uShowRPCs then StatusText('');
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261 | RPCLastCall := RPCBrokerV.RemoteProcedure + ' (completed)';
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262 | end;
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263 |
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264 | procedure CallBroker;
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265 | begin
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266 | UpdateContext(uBaseContext);
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267 | CallBrokerInContext;
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268 | end;
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269 |
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270 | procedure SetBrokerServer(const AName: string; APort: Integer; WantDebug: Boolean);
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271 | { makes the initial connection to a server }
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272 | begin
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273 | EnsureBroker;
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274 | with RPCBrokerV do
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275 | begin
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276 | Server := AName;
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277 | if APort > 0 then ListenerPort := APort;
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278 | DebugMode := WantDebug;
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279 | Connected := True;
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280 | end;
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281 | end;
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282 |
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283 | function AuthorizedOption(const OptionName: string): Boolean;
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284 | { checks to see if the user is authorized to use this application }
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285 | begin
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286 | EnsureBroker;
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287 | Result := RPCBrokerV.CreateContext(OptionName);
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288 | if Result then
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289 | begin
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290 | if (uBaseContext = '') then
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291 | uBaseContext := OptionName;
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292 | uCurrentContext := OptionName;
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293 | end;
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294 | end;
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295 |
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296 | function ConnectToServer(const OptionName: string): Boolean;
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297 | { establish initial connection to server using optional command line parameters and check that
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298 | this application (option) is allowed for this user }
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299 | var
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300 | WantDebug: Boolean;
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301 | AServer, APort, x: string;
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302 | i, ModalResult: Integer;
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303 | begin
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304 | Result := False;
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305 | WantDebug := False;
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306 | AServer := '';
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307 | APort := '';
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308 | for i := 1 to ParamCount do // params may be: S[ERVER]=hostname P[ORT]=port DEBUG
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309 | begin
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310 | if UpperCase(ParamStr(i)) = 'DEBUG' then WantDebug := True;
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311 | if UpperCase(ParamStr(i)) = 'SHOWRPCS' then uShowRPCs := True;
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312 | x := UpperCase(Piece(ParamStr(i), '=', 1));
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313 | if (x = 'S') or (x = 'SERVER') then AServer := Piece(ParamStr(i), '=', 2);
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314 | if (x = 'P') or (x = 'PORT') then APort := Piece(ParamStr(i), '=', 2);
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315 | end;
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316 | if (AServer = '') or (APort = '') then
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317 | begin
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318 | ModalResult := GetServerInfo(AServer, APort);
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319 | if ModalResult = mrCancel then Exit;
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320 | end;
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321 | // use try..except to work around errors in the Broker SignOn screen
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322 | try
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323 | SetBrokerServer(AServer, StrToIntDef(APort, 9200), WantDebug);
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324 | Result := AuthorizedOption(OptionName);
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325 | if Result then Result := RPCBrokerV.Connected;
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326 | RPCBrokerV.RPCTimeLimit := 300;
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327 | except
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328 | on E:EBrokerError do
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329 | begin
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330 | if E.Code <> XWB_BadSignOn then InfoBox(E.Message, 'Error', MB_OK or MB_ICONERROR);
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331 | Result := False;
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332 | end;
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333 | end;
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334 | end;
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335 |
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336 | function MRef(glvn: string): string;
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337 | { prepends ASCII 1 to string, allows SetParams to interpret as an M reference }
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338 | begin
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339 | Result := #1 + glvn;
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340 | end;
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341 |
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342 | function GetRPCCursor: TCursor;
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343 | var
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344 | pt: TPoint;
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345 | begin
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346 | Result := crHourGlass;
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347 | if assigned(AppStartedCursorForm) and (AppStartedCursorForm.Visible) then
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348 | begin
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349 | pt := Mouse.CursorPos;
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350 | if PtInRect(AppStartedCursorForm.BoundsRect, pt) then
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351 | Result := crAppStart;
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352 | end;
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353 | end;
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354 |
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355 | procedure CallV(const RPCName: string; const AParam: array of const);
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356 | { calls the broker leaving results in results property which must be read by caller }
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357 | var
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358 | SavedCursor: TCursor;
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359 | begin
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360 | SavedCursor := Screen.Cursor;
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361 | Screen.Cursor := GetRPCCursor;
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362 | SetParams(RPCName, AParam);
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363 | CallBroker; //RPCBrokerV.Call;
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364 | Screen.Cursor := SavedCursor;
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365 | end;
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366 |
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367 | function sCallV(const RPCName: string; const AParam: array of const): string;
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368 | { calls the broker and returns a scalar value. }
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369 | var
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370 | SavedCursor: TCursor;
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371 | begin
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372 | SavedCursor := Screen.Cursor;
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373 | Screen.Cursor := GetRPCCursor;
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374 | SetParams(RPCName, AParam);
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375 | CallBroker; //RPCBrokerV.Call;
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376 | if RPCBrokerV.Results.Count > 0 then Result := RPCBrokerV.Results[0] else Result := '';
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377 | Screen.Cursor := SavedCursor;
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378 | end;
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379 |
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380 | procedure tCallV(ReturnData: TStrings; const RPCName: string; const AParam: array of const);
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381 | { calls the broker and returns TStrings data }
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382 | var
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383 | SavedCursor: TCursor;
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384 | begin
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385 | if ReturnData = nil then raise Exception.Create('TString not created');
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386 | SavedCursor := Screen.Cursor;
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387 | Screen.Cursor := GetRPCCursor;
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388 | SetParams(RPCName, AParam);
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389 | CallBroker; //RPCBrokerV.Call;
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390 | FastAssign(RPCBrokerV.Results, ReturnData);
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391 | Screen.Cursor := SavedCursor;
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392 | end;
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393 |
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394 | (* uncomment if these are needed -
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395 |
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396 | function pCallV(const RPCName: string; const AParam: array of const): PChar;
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397 | { Calls the Broker. Result is a PChar containing raw Broker data. }
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398 | { -- Caller must dispose the string that is returned -- }
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399 | var
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400 | SavedCursor: TCursor;
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401 | begin
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402 | SavedCursor := Screen.Cursor;
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403 | Screen.Cursor := GetRPCCursor;
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404 | SetParams(RPCName, AParam);
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405 | RPCBrokerV.Call;
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406 | pCallV := StrNew(RPCBrokerV.Results.GetText);
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407 | Screen.Cursor := SavedCursor;
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408 | end;
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409 |
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410 | procedure wCallV(AControl: TControl; const RPCName: string; const AParam: array of const);
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411 | { Calls the Broker. Places data into control (wrapped). }
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412 | var
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413 | BufPtr: PChar;
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414 | begin
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415 | BufPtr := pCallV(RPCName, AParam);
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416 | WrapWP(BufPtr);
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417 | AControl.SetTextBuf(BufPtr);
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418 | StrDispose(BufPtr);
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419 | end;
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420 |
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421 | procedure WrapWP(Buf: pChar);
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422 | { Iterates through Buf and wraps text in the same way that FM wraps text. }
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423 | var
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424 | PSub: PChar;
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425 | begin
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426 | PSub := StrScan(Buf, #13);
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427 | while PSub <> nil do
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428 | begin
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429 | if Ord(PSub[2]) > 32 then
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430 | begin
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431 | StrMove(PSub, PSub + SizeOf(Char), StrLen(PSub));
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432 | PSub[0] := #32;
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433 | end
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434 | else repeat Inc(PSub, SizeOf(Char)) until (Ord(PSub[0]) > 32) or (PSub = StrEnd(PSub));
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435 | PSub := StrScan(PSub, #13);
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436 | end;
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437 | end;
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438 |
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439 | *)
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440 |
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441 | function RetainedRPCCount: Integer;
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442 | begin
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443 | Result := uCallList.Count;
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444 | end;
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445 |
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446 | procedure SetRetainedRPCMax(Value: Integer);
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447 | begin
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448 | if Value > 0 then uMaxCalls := Value;
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449 | end;
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450 |
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451 | function GetRPCMax: integer;
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452 | begin
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453 | Result := uMaxCalls;
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454 | end;
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455 |
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456 | procedure LoadRPCData(Dest: TStrings; ID: Integer);
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457 | begin
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458 | if (ID > -1) and (ID < uCallList.Count) then FastAssign(TStringList(uCallList.Items[ID]), Dest);
|
---|
459 | end;
|
---|
460 |
|
---|
461 | function DottedIPStr: string;
|
---|
462 | { return the IP address of the local machine as a string in dotted form: nnn.nnn.nnn.nnn }
|
---|
463 | const
|
---|
464 | WINSOCK1_1 = $0101; // minimum required version of WinSock
|
---|
465 | SUCCESS = 0; // value returned by WinSock functions if no error
|
---|
466 | var
|
---|
467 | //WSAData: TWSAData; // structure to hold startup information
|
---|
468 | HostEnt: PHostEnt; // pointer to Host Info structure (see WinSock 1.1, page 60)
|
---|
469 | IPAddr: PInAddr; // pointer to IP address in network order (4 bytes)
|
---|
470 | LocalName: array[0..255] of Char; // buffer for the name of the client machine
|
---|
471 | begin
|
---|
472 | Result := 'No IP Address';
|
---|
473 | // ensure the Winsock DLL has been loaded (should be if there is a broker connection)
|
---|
474 | //if WSAStartup(WINSOCK1_1, WSAData) <> SUCCESS then Exit;
|
---|
475 | //try
|
---|
476 | // get the name of the client machine
|
---|
477 | if gethostname(LocalName, SizeOf(LocalName) - 1) <> SUCCESS then Exit;
|
---|
478 | // get information about the client machine (contained in a record of type THostEnt)
|
---|
479 | HostEnt := gethostbyname(LocalName);
|
---|
480 | if HostEnt = nil then Exit;
|
---|
481 | // get a pointer to the four bytes that contain the IP address
|
---|
482 | // Dereference HostEnt to get the THostEnt record. In turn, dereference the h_addr_list
|
---|
483 | // field to get a pointer to the IP address. The pointer to the IP address is type PChar,
|
---|
484 | // so it needs to be typecast as PInAddr in order to make the call to inet_ntoa.
|
---|
485 | IPAddr := PInAddr(HostEnt^.h_addr_list^);
|
---|
486 | // Dereference IPAddr (which is a PChar typecast as PInAddr) to get the 4 bytes that need
|
---|
487 | // to be passed to inet_ntoa. A string with the IP address in dotted format is returned.
|
---|
488 | Result := inet_ntoa(IPAddr^);
|
---|
489 | //finally
|
---|
490 | // causes the reference counter in Winsock (set by WSAStartup, above) to be decremented
|
---|
491 | //WSACleanup;
|
---|
492 | //end;
|
---|
493 | end;
|
---|
494 |
|
---|
495 | procedure RPCIdleCallDone(Msg: string);
|
---|
496 | begin
|
---|
497 | RPCBrokerV.ClearResults := True;
|
---|
498 | end;
|
---|
499 |
|
---|
500 | procedure CallRPCWhenIdle(CallProc: TORIdleCallProc; Msg: String);
|
---|
501 | begin
|
---|
502 | CallWhenIdleNotifyWhenDone(CallProc, RPCIdleCallDone, Msg);
|
---|
503 | end;
|
---|
504 |
|
---|
505 | function ShowRPCList: Boolean;
|
---|
506 | begin
|
---|
507 | if uShowRPCS then Result := True
|
---|
508 | else Result := False;
|
---|
509 | end;
|
---|
510 |
|
---|
511 |
|
---|
512 | initialization
|
---|
513 | RPCBrokerV := nil;
|
---|
514 | RPCLastCall := 'No RPCs called';
|
---|
515 | uCallList := TList.Create;
|
---|
516 | uMaxCalls := 100;
|
---|
517 | uShowRPCs := False;
|
---|
518 |
|
---|
519 | finalization
|
---|
520 | while uCallList.Count > 0 do
|
---|
521 | begin
|
---|
522 | TStringList(uCallList.Items[0]).Free;
|
---|
523 | uCallList.Delete(0);
|
---|
524 | end;
|
---|
525 | uCallList.Free;
|
---|
526 |
|
---|
527 | end.
|
---|