├── .gitignore ├── manager ├── config.yaml ├── go.mod ├── go.sum ├── main.go ├── manager.go ├── packets.go ├── router.go ├── router_handler.go ├── tests.yaml └── utils.go ├── readme.md ├── report.md ├── router ├── ack_routers.go ├── dijkstra.go ├── go.mod ├── lsps.go ├── main.go ├── manager.go ├── packet.go ├── priority_queue.go ├── router.go └── utils.go ├── run.sh └── todo.pdf /.gitignore: -------------------------------------------------------------------------------- 1 | manager/manager 2 | router/router 3 | *.log 4 | tags 5 | 6 | report.pdf 7 | readme.pdf 8 | -------------------------------------------------------------------------------- /manager/config.yaml: -------------------------------------------------------------------------------- 1 | number_of_routers: 6 2 | links: 3 | - node1: 0 4 | node2: 1 5 | cost: 5 6 | - node1: 0 7 | node2: 2 8 | cost: 100 9 | - node1: 1 10 | node2: 2 11 | cost: 4 12 | - node1: 3 13 | node2: 1 14 | cost: 1 15 | - node1: 2 16 | node2: 3 17 | cost: 15 18 | - node1: 2 19 | node2: 4 20 | cost: 30 21 | - node1: 5 22 | node2: 4 23 | cost: 17 24 | 25 | -------------------------------------------------------------------------------- /manager/go.mod: -------------------------------------------------------------------------------- 1 | module manager 2 | 3 | go 1.16 4 | 5 | require github.com/spf13/viper v1.8.0 6 | -------------------------------------------------------------------------------- /manager/go.sum: -------------------------------------------------------------------------------- 1 | cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= 2 | cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= 3 | cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= 4 | cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU= 5 | cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY= 6 | cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc= 7 | cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0= 8 | cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To= 9 | cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4= 10 | cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M= 11 | cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc= 12 | cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk= 13 | cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs= 14 | cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc= 15 | cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY= 16 | cloud.google.com/go v0.72.0/go.mod h1:M+5Vjvlc2wnp6tjzE102Dw08nGShTscUx2nZMufOKPI= 17 | cloud.google.com/go v0.74.0/go.mod h1:VV1xSbzvo+9QJOxLDaJfTjx5e+MePCpCWwvftOeQmWk= 18 | cloud.google.com/go v0.78.0/go.mod h1:QjdrLG0uq+YwhjoVOLsS1t7TW8fs36kLs4XO5R5ECHg= 19 | cloud.google.com/go v0.79.0/go.mod h1:3bzgcEeQlzbuEAYu4mrWhKqWjmpprinYgKJLgKHnbb8= 20 | cloud.google.com/go v0.81.0/go.mod h1:mk/AM35KwGk/Nm2YSeZbxXdrNK3KZOYHmLkOqC2V6E0= 21 | cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o= 22 | cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE= 23 | cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc= 24 | cloud.google.com/go/bigquery v1.5.0/go.mod h1:snEHRnqQbz117VIFhE8bmtwIDY80NLUZUMb4Nv6dBIg= 25 | cloud.google.com/go/bigquery v1.7.0/go.mod h1://okPTzCYNXSlb24MZs83e2Do+h+VXtc4gLoIoXIAPc= 26 | cloud.google.com/go/bigquery v1.8.0/go.mod h1:J5hqkt3O0uAFnINi6JXValWIb1v0goeZM77hZzJN/fQ= 27 | cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE= 28 | 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h1:N0PQaV/YGNqwC0u51sEeR/aUtSLEXKX9iv69rRypqCw= 231 | github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74= 232 | github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74= 233 | github.com/yuin/goldmark v1.1.32/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74= 234 | github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74= 235 | github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k= 236 | go.etcd.io/etcd/api/v3 v3.5.0/go.mod h1:cbVKeC6lCfl7j/8jBhAK6aIYO9XOjdptoxU/nLQcPvs= 237 | go.etcd.io/etcd/client/pkg/v3 v3.5.0/go.mod h1:IJHfcCEKxYu1Os13ZdwCwIUTUVGYTSAM3YSwc9/Ac1g= 238 | go.etcd.io/etcd/client/v2 v2.305.0/go.mod h1:h9puh54ZTgAKtEbut2oe9P4L/oqKCVB6xsXlzd7alYQ= 239 | go.opencensus.io v0.21.0/go.mod h1:mSImk1erAIZhrmZN+AvHh14ztQfjbGwt4TtuofqLduU= 240 | go.opencensus.io v0.22.0/go.mod h1:+kGneAE2xo2IficOXnaByMWTGM9T73dGwxeWcUqIpI8= 241 | go.opencensus.io v0.22.2/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw= 242 | go.opencensus.io v0.22.3/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw= 243 | go.opencensus.io v0.22.4/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw= 244 | go.opencensus.io v0.22.5/go.mod h1:5pWMHQbX5EPX2/62yrJeAkowc+lfs/XD7Uxpq3pI6kk= 245 | go.opencensus.io v0.23.0/go.mod h1:XItmlyltB5F7CS4xOC1DcqMoFqwtC6OG2xF7mCv7P7E= 246 | go.uber.org/atomic v1.7.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc= 247 | go.uber.org/multierr v1.6.0/go.mod h1:cdWPpRnG4AhwMwsgIHip0KRBQjJy5kYEpYjJxpXp9iU= 248 | go.uber.org/zap v1.17.0/go.mod h1:MXVU+bhUf/A7Xi2HNOnopQOrmycQ5Ih87HtOu4q5SSo= 249 | golang.org/x/crypto v0.0.0-20181029021203-45a5f77698d3/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4= 250 | golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w= 251 | golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI= 252 | golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI= 253 | golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI= 254 | golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI= 255 | golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto= 256 | golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA= 257 | golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA= 258 | golang.org/x/exp v0.0.0-20190510132918-efd6b22b2522/go.mod h1:ZjyILWgesfNpC6sMxTJOJm9Kp84zZh5NQWvqDGG3Qr8= 259 | golang.org/x/exp v0.0.0-20190829153037-c13cbed26979/go.mod h1:86+5VVa7VpoJ4kLfm080zCjGlMRFzhUhsZKEZO7MGek= 260 | golang.org/x/exp 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v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4= 297 | golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg= 298 | golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg= 299 | golang.org/x/net v0.0.0-20190501004415-9ce7a6920f09/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg= 300 | golang.org/x/net v0.0.0-20190503192946-f4e77d36d62c/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg= 301 | golang.org/x/net v0.0.0-20190603091049-60506f45cf65/go.mod h1:HSz+uSET+XFnRR8LxR5pz3Of3rY3CfYBVs4xY44aLks= 302 | golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= 303 | golang.org/x/net v0.0.0-20190628185345-da137c7871d7/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= 304 | golang.org/x/net v0.0.0-20190724013045-ca1201d0de80/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= 305 | golang.org/x/net v0.0.0-20191209160850-c0dbc17a3553/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= 306 | golang.org/x/net v0.0.0-20200114155413-6afb5195e5aa/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= 307 | golang.org/x/net v0.0.0-20200202094626-16171245cfb2/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= 308 | golang.org/x/net v0.0.0-20200222125558-5a598a2470a0/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= 309 | golang.org/x/net v0.0.0-20200226121028-0de0cce0169b/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= 310 | golang.org/x/net v0.0.0-20200301022130-244492dfa37a/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= 311 | golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A= 312 | golang.org/x/net v0.0.0-20200501053045-e0ff5e5a1de5/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A= 313 | golang.org/x/net v0.0.0-20200506145744-7e3656a0809f/go.mod 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v0.0.0-20200331122359-1ee6d9798940/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c= 509 | google.golang.org/genproto v0.0.0-20200430143042-b979b6f78d84/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c= 510 | google.golang.org/genproto v0.0.0-20200511104702-f5ebc3bea380/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c= 511 | google.golang.org/genproto v0.0.0-20200513103714-09dca8ec2884/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c= 512 | google.golang.org/genproto v0.0.0-20200515170657-fc4c6c6a6587/go.mod h1:YsZOwe1myG/8QRHRsmBRE1LrgQY60beZKjly0O1fX9U= 513 | google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013/go.mod h1:NbSheEEYHJ7i3ixzK3sjbqSGDJWnxyFXZblF3eUsNvo= 514 | google.golang.org/genproto v0.0.0-20200618031413-b414f8b61790/go.mod h1:jDfRM7FcilCzHH/e9qn6dsT145K34l5v+OpcnNgKAAA= 515 | google.golang.org/genproto v0.0.0-20200729003335-053ba62fc06f/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no= 516 | google.golang.org/genproto v0.0.0-20200804131852-c06518451d9c/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no= 517 | google.golang.org/genproto v0.0.0-20200825200019-8632dd797987/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no= 518 | google.golang.org/genproto v0.0.0-20200904004341-0bd0a958aa1d/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no= 519 | google.golang.org/genproto v0.0.0-20201109203340-2640f1f9cdfb/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no= 520 | google.golang.org/genproto v0.0.0-20201201144952-b05cb90ed32e/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no= 521 | google.golang.org/genproto v0.0.0-20201210142538-e3217bee35cc/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no= 522 | google.golang.org/genproto v0.0.0-20201214200347-8c77b98c765d/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no= 523 | google.golang.org/genproto v0.0.0-20210222152913-aa3ee6e6a81c/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no= 524 | google.golang.org/genproto v0.0.0-20210303154014-9728d6b83eeb/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no= 525 | google.golang.org/genproto v0.0.0-20210310155132-4ce2db91004e/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no= 526 | google.golang.org/genproto v0.0.0-20210319143718-93e7006c17a6/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no= 527 | google.golang.org/genproto v0.0.0-20210402141018-6c239bbf2bb1/go.mod h1:9lPAdzaEmUacj36I+k7YKbEc5CXzPIeORRgDAUOu28A= 528 | google.golang.org/genproto v0.0.0-20210602131652-f16073e35f0c/go.mod h1:UODoCrxHCcBojKKwX1terBiRUaqAsFqJiF615XL43r0= 529 | google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c= 530 | google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38= 531 | google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM= 532 | google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg= 533 | google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY= 534 | google.golang.org/grpc v1.26.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk= 535 | google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk= 536 | google.golang.org/grpc v1.27.1/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk= 537 | google.golang.org/grpc v1.28.0/go.mod h1:rpkK4SK4GF4Ach/+MFLZUBavHOvF2JJB5uozKKal+60= 538 | google.golang.org/grpc v1.29.1/go.mod h1:itym6AZVZYACWQqET3MqgPpjcuV5QH3BxFS3IjizoKk= 539 | google.golang.org/grpc v1.30.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak= 540 | google.golang.org/grpc v1.31.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak= 541 | google.golang.org/grpc v1.31.1/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak= 542 | google.golang.org/grpc v1.33.1/go.mod h1:fr5YgcSWrqhRRxogOsw7RzIpsmvOZ6IcH4kBYTpR3n0= 543 | google.golang.org/grpc v1.33.2/go.mod h1:JMHMWHQWaTccqQQlmk3MJZS+GWXOdAesneDmEnv2fbc= 544 | google.golang.org/grpc v1.34.0/go.mod h1:WotjhfgOW/POjDeRt8vscBtXq+2VjORFy659qA51WJ8= 545 | google.golang.org/grpc v1.35.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU= 546 | google.golang.org/grpc v1.36.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU= 547 | google.golang.org/grpc v1.36.1/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU= 548 | google.golang.org/grpc v1.38.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM= 549 | google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8= 550 | google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0= 551 | google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM= 552 | google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE= 553 | google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo= 554 | google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU= 555 | google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU= 556 | google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU= 557 | google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4= 558 | google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c= 559 | google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw= 560 | google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc= 561 | gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= 562 | gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY= 563 | gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= 564 | gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI= 565 | gopkg.in/ini.v1 v1.62.0 h1:duBzk771uxoUuOlyRLkHsygud9+5lrlGjdFBb4mSKDU= 566 | gopkg.in/ini.v1 v1.62.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k= 567 | gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= 568 | gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= 569 | gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= 570 | gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY= 571 | gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ= 572 | gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= 573 | gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo= 574 | gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= 575 | honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= 576 | honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= 577 | honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= 578 | honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= 579 | honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg= 580 | honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k= 581 | honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k= 582 | rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8= 583 | rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0= 584 | rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA= 585 | -------------------------------------------------------------------------------- /manager/main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "log" 5 | "time" 6 | ) 7 | 8 | func main() { 9 | initLogger() 10 | 11 | manager := newManagerWithConfig("config") 12 | defer manager.freeResources() 13 | 14 | for i := 0; i < manager.routersCount; i++ { 15 | manager.launchRouter(i) 16 | } 17 | 18 | log.Printf("Manager: Waiting for routers to get ready") 19 | manager.readyWG.Wait() 20 | close(manager.readyChannel) 21 | log.Printf("Manager: All routers ready. routers checking direct links") 22 | 23 | manager.networkReadyWG.Wait() 24 | close(manager.networkReadyChannel) 25 | log.Printf("Manager: Network is ready") 26 | 27 | // send tests in yaml to source routers 28 | // they will do the rest of the job 29 | manager.sendTestPackets() 30 | 31 | // wait for routers to transmit packets 32 | // if we quit now, they will be terminated by os 33 | time.Sleep(5 * time.Second) 34 | 35 | } 36 | -------------------------------------------------------------------------------- /manager/manager.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "net" 5 | "sync" 6 | ) 7 | 8 | type Manager struct { 9 | routersCount int 10 | routers []*Router 11 | 12 | netConns [][]*Edge 13 | 14 | readyWG sync.WaitGroup 15 | networkReadyWG sync.WaitGroup 16 | 17 | readyChannel chan struct{} 18 | networkReadyChannel chan struct{} 19 | 20 | listener net.Listener 21 | } 22 | 23 | type Edge struct { 24 | Dest int 25 | Cost int 26 | } 27 | 28 | type ConfigEdge struct { 29 | Node1 int `mapstructure:"node1"` 30 | Node2 int `mapstructure:"node2"` 31 | Cost int `mapstructure:"cost"` 32 | } 33 | 34 | func newManagerWithConfig(configFile string) *Manager { 35 | config := loadYaml(configFile) 36 | routersCount := config.GetInt("number_of_routers") 37 | 38 | manager := &Manager{ 39 | routersCount: routersCount, 40 | netConns: make([][]*Edge, routersCount), 41 | 42 | readyWG: sync.WaitGroup{}, 43 | networkReadyWG: sync.WaitGroup{}, 44 | 45 | readyChannel: make(chan struct{}), 46 | networkReadyChannel: make(chan struct{}), 47 | 48 | routers: make([]*Router, routersCount), 49 | } 50 | 51 | for i := 0; i < manager.routersCount; i++ { 52 | manager.netConns[i] = make([]*Edge, 0) 53 | manager.routers[i] = &Router{Index: i, packetChannel: make(chan string)} 54 | } 55 | 56 | var configEdges []ConfigEdge 57 | pnc(config.UnmarshalKey("links", &configEdges)) 58 | 59 | for _, configEdge := range configEdges { 60 | manager.netConns[configEdge.Node1] = 61 | append(manager.netConns[configEdge.Node1], &Edge{Dest: configEdge.Node2, Cost: configEdge.Cost}) 62 | manager.netConns[configEdge.Node2] = 63 | append(manager.netConns[configEdge.Node2], &Edge{Dest: configEdge.Node1, Cost: configEdge.Cost}) 64 | } 65 | 66 | // start tcp connection 67 | listener, err := net.Listen("tcp", ":8585") 68 | pnc(err) 69 | manager.listener = listener 70 | 71 | // initalize waitgroups 72 | manager.readyWG.Add(manager.routersCount) 73 | manager.networkReadyWG.Add(manager.routersCount) 74 | 75 | return manager 76 | } 77 | func (manager *Manager) freeResources() { 78 | for _, router := range manager.routers { 79 | router.conn.Close() 80 | } 81 | manager.listener.Close() 82 | } 83 | -------------------------------------------------------------------------------- /manager/packets.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "fmt" 5 | "time" 6 | ) 7 | 8 | type Packet struct { 9 | From int `mapstructure:"from"` 10 | To int `mapstructure:"to"` 11 | Data string `mapstructure:"data"` 12 | CostToNow int 13 | } 14 | 15 | func (manager *Manager) sendTestPackets() { 16 | tests := loadYaml("tests") 17 | packets := make([]Packet, 0) 18 | pnc(tests.UnmarshalKey("tests", &packets)) 19 | for _, packet := range packets { 20 | // put packet in sending queue 21 | manager.routers[packet.From].packetChannel <- serializePacket(&packet) 22 | time.Sleep(200 * time.Millisecond) 23 | } 24 | time.Sleep(100 * time.Millisecond) 25 | for i := range manager.routers { 26 | manager.routers[i].packetChannel <- "QUIT" 27 | } 28 | } 29 | 30 | func serializePacket(packet *Packet) string { 31 | return fmt.Sprintf("%d %d %d %s", packet.From, packet.To, packet.CostToNow, packet.Data) 32 | } 33 | -------------------------------------------------------------------------------- /manager/router.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "bufio" 5 | "encoding/json" 6 | "fmt" 7 | "net" 8 | "strconv" 9 | "strings" 10 | ) 11 | 12 | type Router struct { 13 | conn net.Conn 14 | reader *bufio.Reader 15 | writer *bufio.Writer 16 | packetChannel chan string 17 | Index int 18 | Port int 19 | } 20 | 21 | func (router *Router) writeAsString(obj interface{}) { 22 | router.writer.WriteString(fmt.Sprintf("%v\n", obj)) 23 | router.writer.Flush() 24 | } 25 | 26 | func (router *Router) writeAsBytes(obj interface{}) { 27 | marshalled, err := json.Marshal(obj) 28 | pnc(err) 29 | marshalled = append(marshalled, '\n') 30 | _, err = router.writer.Write(marshalled) 31 | pnc(err) 32 | router.writer.Flush() 33 | } 34 | 35 | func (router *Router) readString() string { 36 | str, err := router.reader.ReadString('\n') 37 | pnc(err) 38 | return strings.TrimSpace(str) 39 | } 40 | 41 | func (router *Router) readInt() int { 42 | num, err := strconv.Atoi(router.readString()) 43 | pnc(err) 44 | return num 45 | } 46 | 47 | // change name to set connection 48 | func (router *Router) setConnection(conn net.Conn) { 49 | router.conn = conn 50 | router.reader = bufio.NewReader(conn) 51 | router.writer = bufio.NewWriter(conn) 52 | } 53 | -------------------------------------------------------------------------------- /manager/router_handler.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "bufio" 5 | "fmt" 6 | "io" 7 | "log" 8 | "net" 9 | "os/exec" 10 | ) 11 | 12 | // handle our connection to the router in a new go routine 13 | func (manager *Manager) handleRouter(routerIndex int, conn net.Conn) { 14 | router := manager.routers[routerIndex] 15 | router.Port = router.readInt() 16 | 17 | log.Printf("router #%v: connected, UDP port: %v\n", 18 | router.Index, router.Port) 19 | 20 | router.writeAsString(router.Index) 21 | router.writeAsString(manager.routersCount) 22 | router.writeAsBytes(manager.netConns[router.Index]) 23 | log.Printf("router #%v: connectivity table sent", router.Index) 24 | 25 | manager.getReadySignalFromRouter(router) // wait for this router 26 | <-manager.readyChannel // wait for other routers 27 | router.writeAsString("safe") // tell routers they can ack 28 | manager.sendPortMap(router) // send all routers ports to router 29 | 30 | manager.getAcksReceivedFromRouter(router) // my router got portmap 31 | <-manager.networkReadyChannel // all routers got portmap 32 | 33 | router.writeAsString("NETWORK_READY") 34 | 35 | router.sendDataPackets() 36 | } 37 | 38 | func (router *Router) sendDataPackets() { 39 | for { 40 | // read from packet queue 41 | packet := <-router.packetChannel 42 | log.Printf("router #%v: got packet [%v]\n", router.Index, packet) 43 | router.writeAsString(packet) 44 | 45 | if packet == "QUIT" { 46 | // our last packet 47 | break 48 | } 49 | } 50 | } 51 | 52 | func (manager *Manager) getReadySignalFromRouter(router *Router) { 53 | readiness := router.readString() 54 | if readiness == "READY" { 55 | manager.readyWG.Done() 56 | } else { 57 | panic("Router couldn't get ready.") 58 | } 59 | } 60 | 61 | func (manager *Manager) sendPortMap(router *Router) { 62 | portMap := make(map[int]int) 63 | for _, edge := range manager.netConns[router.Index] { 64 | portMap[edge.Dest] = manager.routers[edge.Dest].Port 65 | } 66 | router.writeAsBytes(portMap) 67 | } 68 | 69 | func (manager *Manager) getAcksReceivedFromRouter(router *Router) { 70 | str := router.readString() 71 | if str != "ACKS_RECEIVED" { 72 | panic(fmt.Sprintf("router #%v didn't receive acks: %v", router.Index, str)) 73 | } 74 | manager.networkReadyWG.Done() 75 | } 76 | 77 | func handleChildError(reader io.ReadCloser, i int) { 78 | sc := bufio.NewScanner(reader) 79 | for { 80 | if !sc.Scan() { 81 | return 82 | } 83 | log.Printf("router #%v (STDERR) : %s\n", i, sc.Text()) 84 | } 85 | } 86 | 87 | func (manager *Manager) launchRouter(i int) { 88 | routerCmd := exec.Command("../router/router") 89 | reader, err := routerCmd.StderrPipe() 90 | pnc(err) 91 | 92 | go handleChildError(reader, i) 93 | routerCmd.Start() 94 | 95 | log.Printf("router #%v: created\n", i) 96 | conn, err := manager.listener.Accept() 97 | pnc(err) 98 | manager.routers[i].setConnection(conn) 99 | go manager.handleRouter(i, conn) 100 | } 101 | -------------------------------------------------------------------------------- /manager/tests.yaml: -------------------------------------------------------------------------------- 1 | tests: 2 | - from: 0 3 | to: 1 4 | data: lorem 5 | - from: 3 6 | to: 1 7 | data: ipsum 8 | - from: 2 9 | to: 0 10 | data: amet 11 | - from: 5 12 | to: 0 13 | data: missicipi 14 | - from: 3 15 | to: 0 16 | data: california 17 | - from: 1 18 | to: 0 19 | data: tehran 20 | - from: 2 21 | to: 3 22 | data: Los Santos 23 | - from: 1 24 | to: 5 25 | data: Michigan 26 | 27 | -------------------------------------------------------------------------------- /manager/utils.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "log" 5 | 6 | "github.com/spf13/viper" 7 | ) 8 | 9 | func initLogger() { 10 | log.SetFlags(0) 11 | log.Println("Manager started") 12 | } 13 | 14 | func pnc(err error) { 15 | if err != nil { 16 | panic(err) 17 | } 18 | } 19 | 20 | func loadYaml(fileName string) *viper.Viper { 21 | config := viper.New() 22 | config.SetConfigName(fileName) 23 | config.AddConfigPath(".") 24 | pnc(config.ReadInConfig()) 25 | return config 26 | } 27 | -------------------------------------------------------------------------------- /readme.md: -------------------------------------------------------------------------------- 1 | # link-state simulation in go 2 | 3 | For the final project of the computer network course at SBU University (spring 2021), we implemented a Link-state simulation in go. 4 | 5 | 6 | 7 | You can read the full description in `todo.pdf`. 8 | 9 | 10 | 11 | ## Brief description 12 | 13 | + There is just one manager with all data (in YAML files) 14 | + It launches some router processes and connects to them with TCP 15 | + Router processes transfer their connectivity table so all of them get the whole network information 16 | + Manager command routers to transfer packets so the routing will be tested. 17 | 18 | 19 | 20 | ## run 21 | 22 | + In order to run, you should run the manager executable 23 | + But before that, the router should be compiled 24 | + There is a shell script responsible for compiling and running both 25 | 26 | 27 | 28 | ## configs 29 | 30 | + Manager read configs from Yaml files. They exist in the manager folder. fill free to change them 31 | + There should be just one `connection component` (all routers should connect to each other indirectly) 32 | + packets will be sent in order. 33 | 34 | 35 | 36 | ## logs 37 | 38 | + manager will print its own logs to stderr 39 | + Routers write logs to separate log files (with the name of their indices) 40 | + If a router fails before initializing the log file, it will send that failing log to the manager (the manager is watching the router processes stderr files) 41 | 42 | + `run.sh` will print all log files in order with one line between them, so you don't need to do anything in order to see logs. 43 | -------------------------------------------------------------------------------- /report.md: -------------------------------------------------------------------------------- 1 | # گزارش پروژه شبیه‌سازی پروتکل link state با golang 2 | 3 | + روزبه شریف نسب 4 | + شهریار مربی 5 | 6 | 7 | 8 | در این گزارش میخواهیم شرح مختصری بر پیاده‌سازی شبیه‌ساز پروتکل link state داشته باشیم. برای پیاده سازی از زبان golang استفاده شد. مزیت این زبان، امکانات راحت‌تر کار با tcp و البته سهولت مثال‌زدنی ساخت و مدیریت ترد‌های جدید و سبک وزن بود. مثلا با کمک چنل‌ها، امکان سنکرون کردن ترد‌های manager و ارسال پکت های مربوطه در زمان مناسب بسیار ساده بود. 9 | 10 | مساله‌ای که متاسفانه به سادگی حل نشد، خواندن از udp بود. برای خواندن از یک کانکشن udp دچار مشکل شدیم! نهایتا راه حلی که وجود داشت این بود که یک بافر با سایز معلوم (در اینجا ۱۰۲۴×۱۰۲۴) بگیریم و امیدوار باشیم داده بزرگ‌تر نشود! با توجه به اینکه متد های خواندن از udp، به همراه داده، آدرس فرستنده را نیز برمی‌گرداندند، خواندن از آن‌ها با readerهای معلوم باعث از دست رفتن این داده می‌شود. البته در برخی قسمت‌ها مشکل ساز نبود اما برای هماهنگی اصلا در udp از reader استفاده نشد. 11 | 12 | متاسفانه با توجه به استفاده‌ی کم در جهان از این پروتکل دوست‌داشتنی، سوال و جواب‌های stackoverflow و آموزش‌های دیگر چندان کافی نبود وگرنه احتمالا روش بهتری نیز هست! البته در این موضوع، تازه بودن زبان گو هم بی‌تاثیر نیست. 13 | 14 | 15 | 16 | مشکل دیگری که برخوردیم، تمایز دادن پکت‌های دریافت شده از udp بود. در واقع مساله این است که رد و بدل کردن ackها بین router ها و سپس lspها به درستی انجام می‌شوند. اما جایی که روتد می‌خواهد پکت‌های data که قرار است رد و بدل شوند را بگیرد، با پکت‌های lsp تکراری مواجه می‌شود. برای حل این مشکل گفتیم در صورتی که پکت lsp دریافت شد آن را drop کرده و مجددا منتظر پکت داده‌ای بماند. 17 | 18 | 19 | 20 | نکته قابل توجه دیگر، لاگ‌ها بودند. لاگ‌های manager در stderr به شکل مستقیم پرینت شدند. این لاگ‌ها به نسبت کوتاه و بدون نکته خاصی هستند. 21 | 22 | اما از آن‌جا که درون یک پروسه، پروسه دیگری را باز کرده بودیم، پروسه‌های روتر خروجی‌شان هیچ‌جا چاپ نمیشد. برای حل این مشکل، در همان پروسه اصلی منیجر، یک reader روی stderr روتر ها باز کردیم تا لاگ‌هایشان به این ترتیب قابل مشاهده باشد. اما مدیریت این روش سحت بود. این روش بعدا برای دیباگ (در صورت panic) استفاده شد. به این صورت که در صورتی که پروسه panic کند، حتما لاگ در stderr چاپ می‌شود و نه جای دیگر، بنابراین در manager آن را از روی reader دریافت می‌کردیم و چاپ می‌کردیم. با پایدار شدن پیاده‌سازی برنامه نیاز به این قسمت وجود ندارد اما همچنان وجود دارد. 23 | 24 | اما برای لاگ‌های اصلی، برای اینکه لاگ روتر ها قابل تشخیص باشد، هر روتر یک فایل به نام اندیسش (که از منیجر می‌گیرد) احداث می‌کند و در آن لاگ‌هایش را می‌نویسد. برای این منظور از change log file خود پکیج log در زبان استفاده شد. 25 | 26 | 27 | 28 | همچنین خلاقیت دیگری که در log ها زده شد این بود که هر لاگ تگ مناسب دارد، در نتیجه می‌توان با یک grep ساده، هر قسمت از لاگ روتر که مد نظر است را جدا کرد. مثلا فقط یک روتر یا دریافت lsp های همه روتر ها یا ... 29 | 30 | 31 | 32 | -------------------------------------------------------------------------------- /router/ack_routers.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "bufio" 5 | "fmt" 6 | "log" 7 | "net" 8 | ) 9 | 10 | func (router *Router) testNeighbouringLinks() { 11 | log.Printf("(ack client) checking neighbouring links started") 12 | for _, edge := range router.neighbours { 13 | index := edge.Dest 14 | port := router.portMap[index] 15 | conn := dialUDP(fmt.Sprintf("localhost:%v", port)) 16 | defer conn.Close() 17 | 18 | router.sendAckRequest(conn, index) 19 | router.getAckResponse(conn, index) 20 | } 21 | router.writeToManager("ACKS_RECEIVED") 22 | log.Printf("(ack client) checking neighbouring links done") 23 | } 24 | 25 | func (router *Router) sendAckRequest(conn net.Conn, index int) { 26 | writer := bufio.NewWriter(conn) 27 | writer.WriteString(fmt.Sprintf("%v\n", router.index)) 28 | writer.Flush() 29 | log.Printf("(ack client) send ack request to router #%v", index) 30 | } 31 | 32 | func (router *Router) getAckResponse(conn net.Conn, index int) { 33 | ackResponse, err := bufio.NewReader(conn).ReadString('\n') 34 | pnc(err) 35 | if ackResponse != "ack\n" { 36 | log.Fatal( 37 | fmt.Sprintf( 38 | "(ack client) router #%v by saying %v didn't ack", 39 | index, ackResponse)) 40 | } 41 | log.Printf("(ack client) received ack from router #%v", index) 42 | 43 | } 44 | 45 | func (router *Router) sendAcknowledgements() { 46 | log.Printf("(ack server) listening for other routers check started") 47 | for i := 0; i < len(router.neighbours); i++ { 48 | ackRequest := make([]byte, 100) 49 | n, addr, err := router.conn.ReadFrom(ackRequest[:]) 50 | pnc(err) 51 | router.conn.WriteTo([]byte("ack\n"), addr) 52 | log.Printf("(ack server) acknowledged router #%v", string(ackRequest[:n-1])) 53 | } 54 | } 55 | 56 | func (router *Router) waitNetworkReadiness() { 57 | str := router.readStringFromManager() 58 | if str != "NETWORK_READY" { 59 | log.Fatal("Manager didn't sent network ready") 60 | } else { 61 | log.Printf("Network is ready") 62 | } 63 | } 64 | -------------------------------------------------------------------------------- /router/dijkstra.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "container/heap" 5 | "log" 6 | "math" 7 | ) 8 | 9 | func (router *Router) calculateSPT() { 10 | pq := make(PriorityQueue, 0) 11 | mark := make([]bool, router.routersCount) 12 | prev := createSlice(router.routersCount, -1) 13 | shortestPathCost := createSlice(router.routersCount, math.MaxInt32) 14 | shortestPathCost[router.index] = 0 15 | router.initPQ(&pq) 16 | router.forwardingTable = make(map[int]int) 17 | router.forwardingTable[router.index] = -1 18 | for pq.Len() > 0 { 19 | pqItem := heap.Pop(&pq).(*PriorityQueueItem) 20 | for mark[pqItem.index] && pq.Len() > 0 { 21 | pqItem = heap.Pop(&pq).(*PriorityQueueItem) 22 | if !mark[pqItem.index] { 23 | break 24 | } 25 | } 26 | if mark[pqItem.index] { 27 | break 28 | } 29 | mark[pqItem.index] = true 30 | for _, edge := range router.netConns[pqItem.index] { 31 | if mark[edge.Dest] { 32 | continue 33 | } 34 | newCost := pqItem.dist + edge.Cost 35 | if newCost >= shortestPathCost[edge.Dest] { 36 | continue 37 | } 38 | shortestPathCost[edge.Dest] = newCost 39 | // push a new item to queue with path source -> pqItem.index -> edge.Dest 40 | heap.Push(&pq, &PriorityQueueItem{ 41 | dist: newCost, 42 | index: edge.Dest, 43 | }) 44 | // update forwarding table 45 | firstRouterInPath := router.forwardingTable[pqItem.index] 46 | if firstRouterInPath == -1 { 47 | firstRouterInPath = edge.Dest 48 | } 49 | router.forwardingTable[edge.Dest] = firstRouterInPath 50 | // update shortest path tree 51 | prev[edge.Dest] = pqItem.index 52 | } 53 | } 54 | log.Printf("Calculated forwarding table:\n\t%+v", router.forwardingTable) 55 | 56 | } 57 | 58 | func (router *Router) initPQ(pq *PriorityQueue) { 59 | heap.Init(pq) 60 | isNeighbour := make([]bool, router.routersCount) 61 | heap.Push(pq, &PriorityQueueItem{ 62 | dist: 0, 63 | index: router.index, 64 | }) 65 | for _, edge := range router.netConns[router.index] { 66 | heap.Push(pq, &PriorityQueueItem{ 67 | dist: edge.Cost, 68 | index: edge.Dest, 69 | }) 70 | isNeighbour[edge.Dest] = true 71 | } 72 | } 73 | -------------------------------------------------------------------------------- /router/go.mod: -------------------------------------------------------------------------------- 1 | module router 2 | 3 | go 1.16 4 | -------------------------------------------------------------------------------- /router/lsps.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "encoding/json" 5 | "log" 6 | ) 7 | 8 | type LSP struct { 9 | SenderIndex int 10 | SenderPort int 11 | 12 | PortMap map[int]int 13 | Neighbours []*Edge 14 | } 15 | 16 | func (router *Router) addToNetConns(index int, neighbours []*Edge) { 17 | // log.Printf("router[%v] has neighbours : ", index) 18 | // for _, v := range neighbours { 19 | // log.Printf(" %v", v.Dest) 20 | // } 21 | router.netConns[index] = neighbours 22 | } 23 | 24 | func (router *Router) receiveSingleLSP() *LSP { 25 | data := router.readUDPAsBytes() 26 | lsp := &LSP{} 27 | // log.Printf("received %v as lsp\n", strings.TrimSpace(string(data))) 28 | // pnc(json.Unmarshal([]byte(strings.TrimSpace(string(data))), lsp)) 29 | pnc(json.Unmarshal(data, lsp)) 30 | return lsp 31 | } 32 | 33 | func (router *Router) recieveLSPs() { 34 | 35 | log.Printf("(lsp server) listening to other routers LSPs started") 36 | remainingTables := router.routersCount - 1 37 | 38 | isTableReceived := make([]bool, router.routersCount) 39 | isTableReceived[router.index] = true 40 | 41 | for remainingTables > 0 { 42 | lsp := router.receiveSingleLSP() 43 | if !isTableReceived[lsp.SenderIndex] { 44 | log.Printf("(lsp server) recieved #%v LSP", lsp.SenderIndex) 45 | 46 | remainingTables-- 47 | isTableReceived[lsp.SenderIndex] = true 48 | 49 | router.addToNetConns(lsp.SenderIndex, lsp.Neighbours) 50 | router.broadcastLSP(lsp) 51 | } 52 | } 53 | log.Printf("(lsp server) receiving LSPs done") 54 | } 55 | 56 | func (router *Router) sendLSPTo(index int, lsp *LSP) { 57 | log.Printf("(lsp client) sending #%v LSP to router[%v]\n", lsp.SenderIndex, index) 58 | 59 | bytes, err := json.Marshal(lsp) 60 | pnc(err) 61 | router.writeUDPAsBytes(index, bytes) 62 | } 63 | 64 | func (router *Router) broadcastLSP(lsp *LSP) { 65 | log.Printf("(lsp client) broadcasting #%v LSP to neighbours", lsp.SenderIndex) 66 | for _, edge := range router.neighbours { 67 | router.sendLSPTo(edge.Dest, lsp) 68 | } 69 | //log.Printf("(lsp client) broadcast LSPs done") 70 | } 71 | 72 | func (router *Router) broadcastSelfLSP() { 73 | router.broadcastLSP(&LSP{ 74 | SenderIndex: router.index, 75 | SenderPort: router.port, 76 | 77 | PortMap: router.portMap, 78 | Neighbours: router.neighbours, 79 | }) 80 | } 81 | -------------------------------------------------------------------------------- /router/main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "log" 5 | "time" 6 | ) 7 | 8 | func main() { 9 | router := NewRouter() 10 | defer router.freeResources() 11 | 12 | router.StartUDPServer() 13 | 14 | router.connectToManager("localhost:8585") 15 | router.writeToManager(router.port) 16 | router.getIndexFromManager() 17 | 18 | router.InitLogger() 19 | 20 | router.readConnectivityTable() 21 | 22 | router.sendReadySignal() 23 | router.waitForNetworkSafety() 24 | 25 | router.getPortMap() 26 | 27 | go router.sendAcknowledgements() 28 | router.testNeighbouringLinks() 29 | router.waitNetworkReadiness() 30 | 31 | router.initalCombinedTables() 32 | go router.broadcastSelfLSP() 33 | router.recieveLSPs() 34 | 35 | router.calculateSPT() 36 | 37 | go router.forwardPacketsFromManager() 38 | go router.forwardPacketsFromOtherRouters() 39 | 40 | <-router.managerPacketsDone 41 | log.Printf("test packets from manager done") 42 | 43 | time.Sleep(3 * time.Second) 44 | log.Printf("done\n") 45 | } 46 | -------------------------------------------------------------------------------- /router/manager.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "bufio" 5 | "encoding/json" 6 | "errors" 7 | "fmt" 8 | "io" 9 | "log" 10 | "net" 11 | "strconv" 12 | "strings" 13 | ) 14 | 15 | func (router *Router) connectToManager(add string) { 16 | connection, err := net.Dial("tcp", "localhost:8585") 17 | pnc(err) 18 | router.managerConnection = connection.(*net.TCPConn) 19 | router.managerReader = bufio.NewReader(router.managerConnection) 20 | router.managerWriter = bufio.NewWriter(router.managerConnection) 21 | } 22 | 23 | func (router *Router) writeToManager(data interface{}) { 24 | router.managerWriter.WriteString(fmt.Sprintf("%v\n", data)) 25 | pnc(router.managerWriter.Flush()) 26 | } 27 | 28 | func (router *Router) readStringFromManager() string { 29 | str, err := router.managerReader.ReadString('\n') 30 | if errors.Is(err, io.EOF) { 31 | return "QUIT" 32 | } 33 | pnc(err) 34 | return strings.TrimSpace(str) 35 | } 36 | 37 | func (router *Router) readBytesFromManager() []byte { 38 | rawMessage, err := router.managerReader.ReadBytes('\n') 39 | pnc(err) 40 | return rawMessage[:len(rawMessage)-1] 41 | } 42 | 43 | func (router *Router) readIntFromManager() int { 44 | num, err := strconv.Atoi(router.readStringFromManager()) 45 | pnc(err) 46 | return num 47 | } 48 | 49 | func (router *Router) getIndexFromManager() { 50 | router.index = router.readIntFromManager() 51 | } 52 | 53 | func (router *Router) readConnectivityTable() { 54 | log.Printf("reading connectivity table") 55 | 56 | router.routersCount = router.readIntFromManager() 57 | rawMessage := router.readBytesFromManager() 58 | pnc(json.Unmarshal(rawMessage, &router.neighbours)) 59 | for _, edge := range router.neighbours { 60 | log.Printf(" {Dest: %+v, Cost: %v}\n", edge.Dest, edge.Cost) 61 | } 62 | } 63 | 64 | func (router *Router) sendReadySignal() { 65 | router.writeToManager("READY") 66 | log.Printf("I am ready") 67 | } 68 | 69 | func (router *Router) waitForNetworkSafety() { 70 | message := router.readStringFromManager() 71 | if message != "safe" { 72 | log.Fatal("We are not safe") 73 | } 74 | log.Printf("We are all safe") 75 | } 76 | 77 | func (router *Router) getPortMap() { 78 | rawMessage := router.readBytesFromManager() 79 | pnc(json.Unmarshal(rawMessage, &router.portMap)) 80 | } 81 | -------------------------------------------------------------------------------- /router/packet.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "fmt" 5 | "log" 6 | "strings" 7 | ) 8 | 9 | type Packet struct { 10 | From int 11 | To int 12 | CostToNow int 13 | 14 | Data string 15 | } 16 | 17 | type RawPacket string 18 | 19 | func parsePacket(rawPacketNotrim RawPacket) *Packet { 20 | rawPacket := strings.TrimSpace(string(rawPacketNotrim)) 21 | packet := &Packet{} 22 | _, err := fmt.Sscanf(rawPacket, "%d %d %d %s", 23 | &packet.From, &packet.To, &packet.CostToNow, &packet.Data) 24 | pnc(err) 25 | return packet 26 | } 27 | 28 | func (packet *Packet) serialize() []byte { 29 | return []byte(fmt.Sprintf("%d %d %d %s", 30 | packet.From, packet.To, packet.CostToNow, packet.Data)) 31 | } 32 | 33 | func (router *Router) writePacketTo(nextHop int, packet *Packet) { 34 | router.writeUDPAsBytes(nextHop, packet.serialize()) 35 | } 36 | 37 | func (router *Router) updatePacket(nextHop int, packet *Packet) { 38 | for _, v := range router.neighbours { 39 | if v.Dest == nextHop { 40 | packet.CostToNow += v.Cost 41 | packet.Data = fmt.Sprintf("%s:%d", packet.Data, nextHop) 42 | return 43 | } 44 | } 45 | log.Fatalf("cannot find next hop cost (%v) for packet (%+v)", nextHop, packet) 46 | } 47 | 48 | func (router *Router) sendPacket(rawPacket RawPacket) { 49 | 50 | packet := parsePacket(rawPacket) 51 | if packet.To == router.index { 52 | log.Printf("Receive packet from #%v with cost %v. [%v]", packet.From, packet.CostToNow, packet.Data) 53 | } else { 54 | nextHop, ok := router.forwardingTable[packet.To] 55 | if !ok { 56 | log.Printf("problem forwarding packet (%v) from router #%v to %v\n", 57 | rawPacket, packet.From, packet.To) 58 | } else { 59 | 60 | log.Printf("forwarding [%v] to nextHop router #%v\n", rawPacket, nextHop) 61 | router.updatePacket(nextHop, packet) 62 | router.writePacketTo(nextHop, packet) 63 | } 64 | } 65 | } 66 | 67 | // determine packets in udp buffer 68 | // they are from previous broadcasting 69 | func (packet RawPacket) isBad() bool { 70 | return packet[0] == '{' 71 | } 72 | -------------------------------------------------------------------------------- /router/priority_queue.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | type PriorityQueue []*PriorityQueueItem 4 | 5 | type PriorityQueueItem struct { 6 | dist int 7 | index int 8 | } 9 | 10 | func (pq PriorityQueue) Len() int { return len(pq) } 11 | 12 | func (pq PriorityQueue) Less(i, j int) bool { 13 | return pq[i].dist < pq[j].dist 14 | } 15 | 16 | func (pq *PriorityQueue) Pop() interface{} { 17 | old := *pq 18 | n := len(old) 19 | item := old[n-1] 20 | *pq = old[0 : n-1] 21 | return item 22 | } 23 | 24 | func (pq *PriorityQueue) Push(x interface{}) { 25 | item := x.(*PriorityQueueItem) 26 | *pq = append(*pq, item) 27 | } 28 | 29 | func (pq PriorityQueue) Swap(i, j int) { 30 | pq[i], pq[j] = pq[j], pq[i] 31 | } 32 | -------------------------------------------------------------------------------- /router/router.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "bufio" 5 | "net" 6 | "os" 7 | ) 8 | 9 | type Router struct { 10 | conn *net.UDPConn 11 | connReader *bufio.Reader 12 | connWriter *bufio.Writer 13 | 14 | port int 15 | index int 16 | logFile *os.File 17 | 18 | routersCount int 19 | neighbours []*Edge 20 | netConns [][]*Edge 21 | forwardingTable map[int]int 22 | shortestPathTree []*Edge 23 | 24 | portMap map[int]int 25 | 26 | managerConnection *net.TCPConn 27 | managerWriter *bufio.Writer 28 | managerReader *bufio.Reader 29 | 30 | forwardingChannel chan string 31 | managerPacketsDone chan struct{} 32 | } 33 | 34 | type Edge struct { 35 | Dest int 36 | Cost int 37 | } 38 | 39 | func NewRouter() *Router { 40 | return &Router{ 41 | managerPacketsDone: make(chan struct{}), 42 | } 43 | } 44 | 45 | func (router *Router) forwardPacketsFromManager() { 46 | for { 47 | data := router.readStringFromManager() 48 | if data == "QUIT" { 49 | close(router.managerPacketsDone) 50 | } else { 51 | rawPacket := RawPacket(data) 52 | router.sendPacket(rawPacket) 53 | } 54 | } 55 | } 56 | 57 | func (router *Router) forwardPacketsFromOtherRouters() { 58 | for { 59 | packet := RawPacket(router.readUDPAsBytes()) 60 | for packet.isBad() { 61 | packet = RawPacket(router.readUDPAsBytes()) 62 | } 63 | router.sendPacket(packet) 64 | } 65 | } 66 | -------------------------------------------------------------------------------- /router/utils.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "bufio" 5 | "fmt" 6 | "log" 7 | "net" 8 | "os" 9 | "runtime/debug" 10 | ) 11 | 12 | func pnc(err error) { 13 | if err != nil { 14 | log.Writer().Write(debug.Stack()) 15 | log.Fatal(err) 16 | } 17 | } 18 | 19 | func getSomeFreePort() int { 20 | listener, err := net.Listen("tcp", ":0") 21 | pnc(err) 22 | //fmt.Fprintf(os.Stderr, "using port: %+v\n", listener.Addr().(*net.TCPAddr)) 23 | pnc(listener.Close()) 24 | return listener.Addr().(*net.TCPAddr).Port 25 | } 26 | 27 | func (router *Router) InitLogger() { 28 | logFileAdd := fmt.Sprintf("../%v.log", router.index) 29 | logFile, err := os.OpenFile(logFileAdd, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666) 30 | pnc(err) 31 | 32 | router.logFile = logFile 33 | 34 | log.SetOutput(logFile) 35 | log.SetFlags(0) 36 | log.Printf("") 37 | log.SetPrefix(fmt.Sprintf("router #%v: ", router.index)) 38 | 39 | log.Printf("connected to manager, udp port: %v", router.port) 40 | 41 | } 42 | 43 | func (router *Router) freeResources() { 44 | if router.logFile != nil { 45 | router.logFile.Close() 46 | } 47 | if router.managerConnection != nil { 48 | router.managerConnection.Close() 49 | } 50 | if router.conn != nil { 51 | router.conn.Close() 52 | } 53 | } 54 | 55 | // open udp port as client 56 | func dialUDP(addr string) net.Conn { 57 | conn, err := net.Dial("udp", addr) 58 | pnc(err) 59 | return conn 60 | } 61 | 62 | func (router *Router) readUDPAsBytes() []byte { 63 | buff := make([]byte, 1024*1024) 64 | n, _, err := router.conn.ReadFromUDP(buff) 65 | pnc(err) 66 | return buff[:n] 67 | } 68 | 69 | // open an udp socket and send byte slice to specified router 70 | func (router *Router) writeUDPAsBytes(index int, data []byte) { 71 | port := router.portMap[index] 72 | conn := dialUDP(fmt.Sprintf("localhost:%v", port)) 73 | defer conn.Close() 74 | 75 | _, err := conn.Write(data) 76 | pnc(err) 77 | } 78 | 79 | // open a UDP server on desired port and start listening 80 | func (router *Router) StartUDPServer() { 81 | const MaxTries = 3 82 | var err error 83 | for failures := 0; failures < MaxTries; failures++ { 84 | port := getSomeFreePort() 85 | // log.Printf("getSomeFreePort() provided port number %v\n", port) 86 | if port == 0 { 87 | log.Fatal("system provided port number 0") 88 | continue 89 | } 90 | addr := fmt.Sprintf(":%d", port) 91 | conn, err := net.ListenPacket("udp", addr) 92 | if err == nil { 93 | router.conn = conn.(*net.UDPConn) 94 | router.connReader = bufio.NewReader(router.conn) 95 | router.connWriter = bufio.NewWriter(router.conn) 96 | router.port = port 97 | break 98 | } 99 | } 100 | pnc(err) 101 | } 102 | 103 | // we need another table near or primary table 104 | // for keep all connections in network, not just ours. 105 | // this function will initialize it from primary table 106 | func (router *Router) initalCombinedTables() { 107 | router.netConns = make([][]*Edge, router.routersCount) 108 | router.netConns[router.index] = router.neighbours 109 | } 110 | 111 | func createSlice(size int, defaultValue int) []int { 112 | slice := make([]int, size) 113 | for i := 0; i < size; i++ { 114 | slice[i] = defaultValue 115 | } 116 | return slice 117 | } 118 | -------------------------------------------------------------------------------- /run.sh: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env bash 2 | 3 | set -o errexit 4 | set -o nounset 5 | 6 | find . -type f -name "*.log" -delete 7 | find . -type f -name "*.spt" -delete 8 | 9 | clear 10 | ( 11 | cd router 12 | go build -race 13 | ) 14 | 15 | 16 | ( 17 | cd manager 18 | go run -race . || true 19 | #./manager || true 20 | ) 21 | 22 | cat ./*.log 23 | -------------------------------------------------------------------------------- /todo.pdf: 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