README
¶
net/rpc のサンプル
net/rpc パッケージは、RPCを扱う通信処理を処理しやすくするパッケージ。
内部のエンコードには encoding/gob が利用されているため、Goアプリ専用のRPC通信となる。
サクッと、RPC通信するプログラムを作成したい場合に便利。
実行
先に「ターミナル２」を起動しておき、その後に「ターミナル１」を実行。
ターミナル１
$ task
task: [run] ./app -server &
task: [run] sleep 1
task: [run] ./app -x 2071723 -y 5363222357
2071723 * 5363222357 = 11111111111111111
task: [run] sleep 1
task: [run] pkill app
ターミナル２
$ task watch
task: [watch] sudo tcpdump -i lo -n 'tcp port 8888' -S -X
tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
listening on lo, link-type EN10MB (Ethernet), snapshot length 262144 bytes
09:33:31.610400 IP 127.0.0.1.59218 > 127.0.0.1.8888: Flags [S], seq 2540744218, win 43690, options [mss 65495,sackOK,TS val 342965887 ecr 0,nop,wscale 7], length 0
0x0000: 4500 003c 8c51 4000 4006 b068 7f00 0001 E..<.Q@.@..h....
0x0010: 7f00 0001 e752 22b8 9770 ae1a 0000 0000 .....R"..p......
0x0020: a002 aaaa fe30 0000 0204 ffd7 0402 080a .....0..........
0x0030: 1471 3e7f 0000 0000 0103 0307 .q>.........
09:33:31.610412 IP 127.0.0.1.8888 > 127.0.0.1.59218: Flags [S.], seq 2746200011, ack 2540744219, win 43690, options [mss 65495,sackOK,TS val 342965887 ecr 342965887,nop,wscale 7], length 0
0x0000: 4500 003c 0000 4000 4006 3cba 7f00 0001 E..<..@.@.<.....
0x0010: 7f00 0001 22b8 e752 a3af afcb 9770 ae1b ...."..R.....p..
0x0020: a012 aaaa fe30 0000 0204 ffd7 0402 080a .....0..........
0x0030: 1471 3e7f 1471 3e7f 0103 0307 .q>..q>.....
09:33:31.610421 IP 127.0.0.1.59218 > 127.0.0.1.8888: Flags [.], ack 2746200012, win 342, options [nop,nop,TS val 342965887 ecr 342965887], length 0
0x0000: 4500 0034 8c52 4000 4006 b06f 7f00 0001 E..4.R@.@..o....
0x0010: 7f00 0001 e752 22b8 9770 ae1b a3af afcc .....R"..p......
0x0020: 8010 0156 fe28 0000 0101 080a 1471 3e7f ...V.(.......q>.
0x0030: 1471 3e7f .q>.
09:33:31.610557 IP 127.0.0.1.59218 > 127.0.0.1.8888: Flags [P.], seq 2540744219:2540744338, ack 2746200012, win 342, options [nop,nop,TS val 342965887 ecr 342965887], length 119
0x0000: 4500 00ab 8c53 4000 4006 aff7 7f00 0001 E....S@.@.......
0x0010: 7f00 0001 e752 22b8 9770 ae1b a3af afcc .....R"..p......
0x0020: 8018 0156 fe9f 0000 0101 080a 1471 3e7f ...V.........q>.
0x0030: 1471 3e7f 2e7f 0301 0107 5265 7175 6573 .q>.......Reques
0x0040: 7401 ff80 0001 0201 0d53 6572 7669 6365 t........Service
0x0050: 4d65 7468 6f64 010c 0001 0353 6571 0106 Method.....Seq..
0x0060: 0000 0015 ff80 0110 5365 7276 6963 652e ........Service.
0x0070: 4d75 6c74 6970 6c79 0021 ff81 0301 0107 Multiply.!......
0x0080: 5265 7175 6573 7401 ff82 0001 0201 0158 Request........X
0x0090: 0104 0001 0159 0104 0000 000f ff82 01fd .....Y..........
0x00a0: 3f39 5601 fb02 7f58 8eaa 00 ?9V....X...
09:33:31.610567 IP 127.0.0.1.8888 > 127.0.0.1.59218: Flags [.], ack 2540744338, win 341, options [nop,nop,TS val 342965887 ecr 342965887], length 0
0x0000: 4500 0034 c47a 4000 4006 7847 7f00 0001 E..4.z@.@.xG....
0x0010: 7f00 0001 22b8 e752 a3af afcc 9770 ae92 ...."..R.....p..
0x0020: 8010 0155 fe28 0000 0101 080a 1471 3e7f ...U.(.......q>.
0x0030: 1471 3e7f .q>.
09:33:31.610838 IP 127.0.0.1.8888 > 127.0.0.1.59218: Flags [P.], seq 2746200012:2746200139, ack 2540744338, win 342, options [nop,nop,TS val 342965888 ecr 342965887], length 127
0x0000: 4500 00b3 c47b 4000 4006 77c7 7f00 0001 E....{@.@.w.....
0x0010: 7f00 0001 22b8 e752 a3af afcc 9770 ae92 ...."..R.....p..
0x0020: 8018 0156 fea7 0000 0101 080a 1471 3e80 ...V.........q>.
0x0030: 1471 3e7f 397f 0301 0108 5265 7370 6f6e .q>.9.....Respon
0x0040: 7365 01ff 8000 0103 010d 5365 7276 6963 se........Servic
0x0050: 654d 6574 686f 6401 0c00 0103 5365 7101 eMethod.....Seq.
0x0060: 0600 0105 4572 726f 7201 0c00 0000 15ff ....Error.......
0x0070: 8001 1053 6572 7669 6365 2e4d 756c 7469 ...Service.Multi
0x0080: 706c 7900 21ff 8103 0101 0852 6573 706f ply.!......Respo
0x0090: 6e73 6501 ff82 0001 0101 0652 6573 756c nse........Resul
0x00a0: 7401 0400 0000 0cff 8201 f94e f2fe 4dac t..........N..M.
0x00b0: e38e 00 ...
09:33:31.610847 IP 127.0.0.1.59218 > 127.0.0.1.8888: Flags [.], ack 2746200139, win 342, options [nop,nop,TS val 342965888 ecr 342965888], length 0
0x0000: 4500 0034 8c54 4000 4006 b06d 7f00 0001 E..4.T@.@..m....
0x0010: 7f00 0001 e752 22b8 9770 ae92 a3af b04b .....R"..p.....K
0x0020: 8010 0156 fe28 0000 0101 080a 1471 3e80 ...V.(.......q>.
0x0030: 1471 3e80 .q>.
09:33:31.610967 IP 127.0.0.1.59218 > 127.0.0.1.8888: Flags [F.], seq 2540744338, ack 2746200139, win 342, options [nop,nop,TS val 342965888 ecr 342965888], length 0
0x0000: 4500 0034 8c55 4000 4006 b06c 7f00 0001 E..4.U@.@..l....
0x0010: 7f00 0001 e752 22b8 9770 ae92 a3af b04b .....R"..p.....K
0x0020: 8011 0156 fe28 0000 0101 080a 1471 3e80 ...V.(.......q>.
0x0030: 1471 3e80 .q>.
09:33:31.611026 IP 127.0.0.1.8888 > 127.0.0.1.59218: Flags [F.], seq 2746200139, ack 2540744339, win 342, options [nop,nop,TS val 342965888 ecr 342965888], length 0
0x0000: 4500 0034 c47c 4000 4006 7845 7f00 0001 E..4.|@.@.xE....
0x0010: 7f00 0001 22b8 e752 a3af b04b 9770 ae93 ...."..R...K.p..
0x0020: 8011 0156 fe28 0000 0101 080a 1471 3e80 ...V.(.......q>.
0x0030: 1471 3e80 .q>.
09:33:31.611052 IP 127.0.0.1.59218 > 127.0.0.1.8888: Flags [.], ack 2746200140, win 342, options [nop,nop,TS val 342965888 ecr 342965888], length 0
0x0000: 4500 0034 8c56 4000 4006 b06b 7f00 0001 E..4.V@.@..k....
0x0010: 7f00 0001 e752 22b8 9770 ae93 a3af b04c .....R"..p.....L
0x0020: 8010 0156 fe28 0000 0101 080a 1471 3e80 ...V.(.......q>.
0x0030: 1471 3e80 .q>.
^C
10 packets captured
20 packets received by filter
0 packets dropped by kernel
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