1 | #include "ncdispatch.h" |
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2 | #include "nc_uri.h" |
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3 | |
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4 | extern int NCSUBSTRATE_intialize(void); |
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5 | |
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6 | /* Define vectors of zeros and ones for use with various nc_get_varX function*/ |
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7 | size_t nc_sizevector0[NC_MAX_DIMS]; |
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8 | size_t nc_sizevector1[NC_MAX_DIMS]; |
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9 | ptrdiff_t nc_ptrdiffvector1[NC_MAX_DIMS]; |
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10 | |
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11 | /* Define the known protocols and their manipulations */ |
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12 | static struct NCPROTOCOLLIST { |
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13 | char* protocol; |
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14 | char* substitute; |
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15 | int modelflags; |
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16 | } ncprotolist[] = { |
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17 | {"http",NULL,0}, |
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18 | {"https",NULL,0}, |
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19 | {"file",NULL,NC_DISPATCH_NCD}, |
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20 | {"dods","http",NC_DISPATCH_NCD}, |
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21 | {"dodss","https",NC_DISPATCH_NCD}, |
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22 | {"cdmr","http",NC_DISPATCH_NCR|NC_DISPATCH_NC4}, |
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23 | {"cdmrs","https",NC_DISPATCH_NCR|NC_DISPATCH_NC4}, |
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24 | {"cdmremote","http",NC_DISPATCH_NCR|NC_DISPATCH_NC4}, |
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25 | {"cdmremotes","https",NC_DISPATCH_NCR|NC_DISPATCH_NC4}, |
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26 | {NULL,NULL,0} /* Terminate search */ |
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27 | }; |
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28 | |
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29 | /* Define the server to ping in order; |
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30 | make the order attempt to optimize |
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31 | against future changes. |
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32 | */ |
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33 | static const char* servers[] = { |
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34 | "http://motherlode.ucar.edu:8081", /* try this first */ |
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35 | "http://remotetest.unidata.ucar.edu", |
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36 | "http://remotetest.ucar.edu", |
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37 | "http://motherlode.ucar.edu:8080", |
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38 | "http://motherlode.ucar.edu", |
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39 | "http://remotetests.unidata.ucar.edu", |
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40 | "http://remotetests.ucar.edu", |
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41 | NULL |
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42 | }; |
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43 | |
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44 | /* |
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45 | static nc_type longtype = (sizeof(long) == sizeof(int)?NC_INT:NC_INT64); |
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46 | static nc_type ulongtype = (sizeof(unsigned long) == sizeof(unsigned int)?NC_UINT:NC_UINT64); |
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47 | */ |
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48 | |
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49 | /* Allow dispatch to do initialization */ |
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50 | int |
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51 | NCDISPATCH_initialize(void) |
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52 | { |
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53 | extern int NCSUBSTRATE_initialize(void); |
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54 | int i; |
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55 | NCSUBSTRATE_initialize(); |
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56 | for(i=0;i<NC_MAX_VAR_DIMS;i++) { |
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57 | nc_sizevector0[i] = 0; |
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58 | nc_sizevector1[i] = 1; |
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59 | nc_ptrdiffvector1[i] = 1; |
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60 | } |
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61 | return NC_NOERR; |
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62 | } |
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63 | |
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64 | /* search list of servers and return first that succeeds when |
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65 | concatenated with the specified path part |
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66 | */ |
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67 | const char* |
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68 | NC_findtestserver(const char* path) |
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69 | { |
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70 | #ifdef USE_DAP |
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71 | /* NCDAP_ping is defined in libdap2/ncdap3.c */ |
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72 | const char** svc; |
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73 | if(path == NULL) path = ""; |
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74 | for(svc=servers;*svc != NULL;svc++) { |
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75 | int stat; |
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76 | char url[4096]; |
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77 | snprintf(url,sizeof(url),"%s%s%s", |
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78 | *svc, |
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79 | (path[0] == '/' ? "" : "/"), |
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80 | path); |
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81 | stat = NCDAP_ping(url); |
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82 | if(stat == NC_NOERR) |
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83 | return *svc; |
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84 | } |
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85 | #endif |
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86 | return NULL; |
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87 | } |
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88 | |
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89 | |
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90 | /* return 1 if path looks like a url; 0 otherwise */ |
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91 | int |
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92 | NC_testurl(const char* path) |
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93 | { |
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94 | int isurl = 0; |
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95 | NC_URI* tmpurl = NULL; |
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96 | char* p; |
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97 | |
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98 | if(path == NULL) return 0; |
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99 | |
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100 | /* find leading non-blank */ |
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101 | for(p=(char*)path;*p;p++) {if(*p != ' ') break;} |
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102 | |
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103 | /* Do some initial checking to see if this looks like a file path */ |
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104 | if(*p == '/') return 0; /* probably an absolute file path */ |
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105 | |
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106 | /* Ok, try to parse as a url */ |
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107 | if(nc_uriparse(path,&tmpurl)) { |
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108 | /* Do some extra testing to make sure this really is a url */ |
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109 | /* Look for a knownprotocol */ |
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110 | struct NCPROTOCOLLIST* protolist; |
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111 | for(protolist=ncprotolist;protolist->protocol;protolist++) { |
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112 | if(strcmp(tmpurl->protocol,protolist->protocol) == 0) { |
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113 | isurl=1; |
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114 | break; |
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115 | } |
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116 | } |
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117 | nc_urifree(tmpurl); |
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118 | return isurl; |
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119 | } |
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120 | return 0; |
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121 | } |
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122 | |
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123 | /* |
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124 | Return the OR of some of the NC_DISPATCH flags |
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125 | Assumes that the path is known to be a url |
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126 | */ |
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127 | |
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128 | int |
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129 | NC_urlmodel(const char* path) |
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130 | { |
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131 | int model = 0; |
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132 | NC_URI* tmpurl = NULL; |
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133 | struct NCPROTOCOLLIST* protolist; |
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134 | |
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135 | if(!nc_uriparse(path,&tmpurl)) goto done; |
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136 | |
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137 | /* Look at any prefixed parameters */ |
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138 | if(nc_urilookup(tmpurl,"netcdf4",NULL) |
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139 | || nc_urilookup(tmpurl,"netcdf-4",NULL)) { |
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140 | model = (NC_DISPATCH_NC4|NC_DISPATCH_NCD); |
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141 | } else if(nc_urilookup(tmpurl,"netcdf3",NULL) |
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142 | || nc_urilookup(tmpurl,"netcdf-3",NULL)) { |
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143 | model = (NC_DISPATCH_NC3|NC_DISPATCH_NCD); |
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144 | } else if(nc_urilookup(tmpurl,"cdmremote",NULL) |
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145 | || nc_urilookup(tmpurl,"cdmr",NULL)) { |
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146 | model = (NC_DISPATCH_NCR|NC_DISPATCH_NC4); |
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147 | } |
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148 | |
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149 | if(model == 0) { |
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150 | /* Now look at the protocol */ |
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151 | for(protolist=ncprotolist;protolist->protocol;protolist++) { |
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152 | if(strcmp(tmpurl->protocol,protolist->protocol) == 0) { |
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153 | model |= protolist->modelflags; |
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154 | if(protolist->substitute) { |
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155 | if(tmpurl->protocol) free(tmpurl->protocol); |
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156 | tmpurl->protocol = strdup(protolist->substitute); |
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157 | } |
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158 | break; |
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159 | } |
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160 | } |
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161 | } |
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162 | |
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163 | /* Force NC_DISPATCH_NC3 if necessary */ |
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164 | if((model & NC_DISPATCH_NC4) == 0) |
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165 | model |= (NC_DISPATCH_NC3 | NC_DISPATCH_NCD); |
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166 | |
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167 | done: |
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168 | nc_urifree(tmpurl); |
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169 | return model; |
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170 | } |
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171 | |
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172 | /* Override dispatch table management */ |
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173 | static NC_Dispatch* NC_dispatch_override = NULL; |
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174 | |
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175 | /* Override dispatch table management */ |
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176 | NC_Dispatch* |
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177 | NC_get_dispatch_override(void) { |
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178 | return NC_dispatch_override; |
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179 | } |
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180 | |
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181 | void NC_set_dispatch_override(NC_Dispatch* d) |
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182 | { |
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183 | NC_dispatch_override = d; |
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184 | } |
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185 | |
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186 | /* Overlay by treating the tables as arrays of void*. |
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187 | Overlay rules are: |
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188 | overlay base merge |
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189 | ------- ---- ----- |
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190 | null null null |
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191 | null y y |
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192 | x null x |
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193 | x y x |
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194 | */ |
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195 | |
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196 | int |
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197 | NC_dispatch_overlay(const NC_Dispatch* overlay, const NC_Dispatch* base, NC_Dispatch* merge) |
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198 | { |
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199 | void** voverlay = (void**)overlay; |
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200 | void** vmerge; |
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201 | int i, count = sizeof(NC_Dispatch) / sizeof(void*); |
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202 | /* dispatch table must be exact multiple of sizeof(void*) */ |
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203 | assert(count * sizeof(void*) == sizeof(NC_Dispatch)); |
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204 | *merge = *base; |
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205 | vmerge = (void**)merge; |
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206 | for(i=0;i<count;i++) { |
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207 | if(voverlay[i] == NULL) continue; |
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208 | vmerge[i] = voverlay[i]; |
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209 | } |
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210 | /* Finally, the merge model should always be the overlay model */ |
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211 | merge->model = overlay->model; |
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212 | return NC_NOERR; |
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213 | } |
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