[161] | 1 | /* Virginia Tech Cognitive Radio Open Source Systems |
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| 2 | * Virginia Tech, 2009 |
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| 3 | * |
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| 4 | * LICENSE INFORMATION GOES HERE |
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| 5 | */ |
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| 6 | |
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| 7 | /* DESCRIPTION OF FILE. |
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| 8 | */ |
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| 9 | |
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| 10 | |
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| 11 | #include <cstdlib> |
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| 12 | #include <cstring> |
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| 13 | #include <stdint.h> |
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| 14 | |
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| 15 | #include "vtcross/common.h" |
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| 16 | #include "vtcross/components.h" |
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| 17 | #include "vtcross/containers.h" |
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| 18 | #include "vtcross/debug.h" |
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| 19 | #include "vtcross/error.h" |
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| 20 | #include "vtcross/socketcomm.h" |
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| 21 | |
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| 22 | |
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| 23 | PolicyEngine::PolicyEngine() |
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| 24 | { |
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| 25 | LOG("Creating Policy Engine.\n"); |
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[185] | 26 | SML_present = false; |
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[161] | 27 | LoadPolicies(); |
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| 28 | } |
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| 29 | |
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| 30 | |
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| 31 | PolicyEngine::~PolicyEngine() |
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| 32 | { |
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| 33 | } |
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| 34 | |
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| 35 | |
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[193] | 36 | PolicyEngine::PolicyEngine(const char* serverName, const char* serverPort, \ |
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[186] | 37 | const bool SML) |
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[181] | 38 | { |
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| 39 | LOG("Creating Policy Engine.\n"); |
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| 40 | |
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[186] | 41 | SML_present = SML; |
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[194] | 42 | |
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| 43 | ConnectToRemoteComponent(serverName, serverPort); |
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[181] | 44 | |
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[194] | 45 | LoadPolicies(); |
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| 46 | } |
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| 47 | |
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| 48 | |
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| 49 | void |
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| 50 | PolicyEngine::SendComponentType() |
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| 51 | { |
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| 52 | SendMessage(commandSocketFD, "response_engine_policy"); |
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| 53 | LOG("Policy Engine responded to GetRemoteComponentType query.\n"); |
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| 54 | } |
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| 55 | |
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| 56 | |
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| 57 | void |
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| 58 | PolicyEngine::ConnectToRemoteComponent(const char* serverName, \ |
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| 59 | const char* serverPort) |
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| 60 | { |
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[193] | 61 | commandSocketFD = ClientSocket(serverName, serverPort); |
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[181] | 62 | |
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[186] | 63 | if(SML_present) { |
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[188] | 64 | RegisterServices(); |
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[186] | 65 | LOG("Policy Engine connected to SML at %s.\n", serverName); |
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| 66 | } |
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| 67 | else { |
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[188] | 68 | RegisterComponent(); |
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[186] | 69 | LOG("Policy Engine connected to shell at %s.\n", serverName); |
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| 70 | } |
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[181] | 71 | } |
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| 72 | |
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| 73 | |
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[161] | 74 | void |
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[188] | 75 | PolicyEngine::WaitForSignal() |
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[161] | 76 | { |
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[194] | 77 | char buffer[256]; |
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[161] | 78 | |
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[194] | 79 | while(true) { |
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| 80 | memset(buffer, 0, 256); |
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| 81 | |
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| 82 | ReadMessage(commandSocketFD, buffer); |
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[164] | 83 | |
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[194] | 84 | // TODO this is ugly... is there a better way? Doesn't strcmp compare the |
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| 85 | // whole string? We only need to compare until we find a single different |
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| 86 | // byte... |
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| 87 | if(strcmp(buffer, "validate_parameters") == 0) { |
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| 88 | ValidateParameters(); |
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| 89 | } |
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| 90 | else if(strcmp(buffer, "query_component_type") == 0) { |
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| 91 | SendComponentType(); |
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| 92 | } |
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| 93 | else if(strcmp(buffer, "connect_sml") == 0) { |
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| 94 | /* This command implies that we are disconnecting from the shell and |
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| 95 | * connecting to a SML component. */ |
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| 96 | char serverName[256]; |
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| 97 | char serverPort[256]; |
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| 98 | // TODO is this going to end up being too slow? |
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| 99 | memset(serverName, 0, 256); |
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| 100 | memset(serverPort, 0, 256); |
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[161] | 101 | |
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[194] | 102 | ReadMessage(commandSocketFD, serverName); |
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| 103 | ReadMessage(commandSocketFD, serverPort); |
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| 104 | |
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| 105 | /* Only continue if we are currently connected to a shell. */ |
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| 106 | if(!SML_present) { |
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| 107 | DeregisterComponent(); |
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| 108 | |
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| 109 | shutdown(commandSocketFD, 2); |
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| 110 | close(commandSocketFD); |
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| 111 | |
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| 112 | SML_present = true; |
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| 113 | |
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| 114 | ConnectToRemoteComponent(serverName, serverPort); |
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| 115 | } |
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| 116 | } |
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| 117 | else if(strcmp(buffer, "disconnect_sml") == 0) { |
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| 118 | /* This command implies that we are disconnecting from the SML and |
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| 119 | * connecting to a shell component. */ |
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| 120 | char serverName[256]; |
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| 121 | char serverPort[256]; |
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| 122 | // TODO is this going to end up being too slow? |
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| 123 | memset(serverName, 0, 256); |
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| 124 | memset(serverPort, 0, 256); |
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| 125 | |
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| 126 | ReadMessage(commandSocketFD, serverName); |
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| 127 | ReadMessage(commandSocketFD, serverPort); |
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| 128 | |
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| 129 | /* We only want to do this if we are actually connected to an SML |
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| 130 | * currently. */ |
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| 131 | if(SML_present) { |
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| 132 | DeregisterServices(); |
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| 133 | |
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| 134 | shutdown(commandSocketFD, 2); |
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| 135 | close(commandSocketFD); |
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| 136 | |
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| 137 | SML_present = false; |
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| 138 | |
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| 139 | ConnectToRemoteComponent(serverName, serverPort); |
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| 140 | } |
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| 141 | } |
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| 142 | else if(strcmp(buffer, "relead_engine_configs") == 0) { |
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| 143 | ReloadPolicies(); |
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| 144 | } |
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| 145 | else if(strcmp(buffer, "reset_engine_policy") == 0) { |
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| 146 | Reset(); |
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| 147 | } |
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| 148 | else if(strcmp(buffer, "shutdown_engine_policy") == 0) { |
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| 149 | Shutdown(); |
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| 150 | } |
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[161] | 151 | } |
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| 152 | } |
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| 153 | |
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| 154 | |
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| 155 | void |
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| 156 | PolicyEngine::Shutdown() |
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| 157 | { |
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[185] | 158 | if(SML_present) |
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[188] | 159 | DeregisterServices(); |
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[186] | 160 | else |
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[188] | 161 | DeregisterComponent(); |
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[194] | 162 | |
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| 163 | // TODO should something else be happening here? |
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[161] | 164 | } |
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| 165 | |
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| 166 | |
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| 167 | void |
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| 168 | PolicyEngine::Reset() |
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| 169 | { |
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[186] | 170 | LOG("Resetting Policy Engine.\n"); |
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| 171 | SML_present = false; |
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[191] | 172 | commandSocketFD = -1; |
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[186] | 173 | LoadPolicies(); |
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[161] | 174 | } |
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| 175 | |
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| 176 | |
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| 177 | void |
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[188] | 178 | PolicyEngine::RegisterComponent() |
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[161] | 179 | { |
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[191] | 180 | SendMessage(commandSocketFD, "register_engine_policy"); |
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[194] | 181 | LOG("Policy Engine:: Registration message sent to shell.\n"); |
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[181] | 182 | |
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[161] | 183 | } |
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| 184 | |
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| 185 | |
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| 186 | void |
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[188] | 187 | PolicyEngine::DeregisterComponent() |
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[161] | 188 | { |
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[191] | 189 | SendMessage(commandSocketFD, "deregister_engine_policy"); |
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[194] | 190 | LOG("Policy Engine:: Deregistration message sent to shell.\n"); |
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[161] | 191 | } |
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| 192 | |
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| 193 | |
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| 194 | void |
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[188] | 195 | PolicyEngine::RegisterServices() |
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[161] | 196 | { |
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[181] | 197 | LOG("Policy Engine:: Registering services.\n"); |
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[191] | 198 | SendMessage(commandSocketFD, "register_service_pe_geo"); |
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| 199 | SendMessage(commandSocketFD, "register_service_pe_time"); |
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| 200 | SendMessage(commandSocketFD, "register_service_pe_spectrum"); |
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| 201 | SendMessage(commandSocketFD, "register_service_pe_spacial"); |
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[161] | 202 | } |
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| 203 | |
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| 204 | |
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| 205 | void |
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[188] | 206 | PolicyEngine::DeregisterServices() |
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[161] | 207 | { |
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[181] | 208 | LOG("Policy Engine:: Deregistering services.\n"); |
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[191] | 209 | SendMessage(commandSocketFD, "deregister_service_pe_geo"); |
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| 210 | SendMessage(commandSocketFD, "deregister_service_pe_time"); |
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| 211 | SendMessage(commandSocketFD, "deregister_service_pe_spectrum"); |
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| 212 | SendMessage(commandSocketFD, "deregister_service_pe_spacial"); |
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[161] | 213 | } |
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| 214 | |
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| 215 | |
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| 216 | void |
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| 217 | PolicyEngine::LoadPolicies() |
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| 218 | { |
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| 219 | LOG("PolicyEngine:: Loading policies.\n"); |
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| 220 | } |
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| 221 | |
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| 222 | |
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| 223 | void |
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| 224 | PolicyEngine::ReloadPolicies() |
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| 225 | { |
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[182] | 226 | LOG("PolicyEngine:: Reloading policies.\n"); |
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[161] | 227 | } |
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| 228 | |
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| 229 | |
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| 230 | void |
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[188] | 231 | PolicyEngine::SendPEDecision(struct Parameter pList[], \ |
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[195] | 232 | struct Radio_Info *radio_info, int32_t decision_array[]) |
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[161] | 233 | { |
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| 234 | char var[50]; |
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| 235 | |
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[195] | 236 | for (size_t i = 0; i < radio_info->numParameters; i++) { |
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[161] | 237 | sprintf(var, "%i", decision_array[i]); |
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[191] | 238 | SendMessage(commandSocketFD, var); |
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[161] | 239 | } |
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| 240 | } |
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| 241 | |
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| 242 | |
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| 243 | void |
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[194] | 244 | PolicyEngine::ValidateParameters() |
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[161] | 245 | { |
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[194] | 246 | LOG("Policy Engine:: Preparing to receive parameters for validation....\n"); |
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| 247 | |
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| 248 | int32_t decision_array[10]; |
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| 249 | struct Parameter pList[10]; |
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[195] | 250 | struct Radio_Info radio_info; |
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[194] | 251 | |
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[195] | 252 | if(GetRequest(commandSocketFD, pList, &radio_info)) { |
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[194] | 253 | LOG("Policy Engine:: Validating Transmission Parameters.\n"); |
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[195] | 254 | for (size_t i = 0; i < radio_info.numParameters; i++) |
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[194] | 255 | decision_array[i] = 1; |
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| 256 | |
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| 257 | LOG("Policy Engine:: Sending Policy decision to Server.\n"); |
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[195] | 258 | SendPEDecision(pList, &radio_info, decision_array); |
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[194] | 259 | |
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| 260 | LOG("Policy Engine:: Policies Validated.\n"); |
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| 261 | } |
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| 262 | else |
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| 263 | ERROR(1, "Call to GetRequest in ValidateParameters failed.\n"); |
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| 264 | |
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[161] | 265 | } |
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| 266 | |
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