问题描述
我一直在寻找利用NC是一个班轮为泊坞窗容器的最小REST Web服务器。例如:
I was looking for the minimum REST web server using nc to be a one-liner for a Docker container. For instance:
* http://localhost/echo/marcello: prints marcello
* http://localhost/date: prints the server's date
* http://localhost/...: others
我是用的netcat ,并创建了一个班轮REST服务器。有的头被丢失,但它正确处理HTTP GET和未执行的资源404。
I hacked the example given by @syme at "http://stackoverflow.com/a/24342101/433814" and created the one-liner REST server. Some headers are missing, but it correctly handles HTTP GET and 404 of non-implemented resources.
rm -f out ; mkfifo out ; trap "rm -f out" EXIT ; while true ; do cat out | nc -l 1500 > >(export REQUEST= ; while read line ; do line=$(echo "$line" | tr -d '[\r\n]') ; if echo "$line" | grep -qE '^GET /' ; then REQUEST=$(echo "$line" | cut -d ' ' -f2) ; elif [ "x$line" = x ] ; then HTTP_200="HTTP/1.1 200 OK" ; HTTP_LOCATION="Location:" ; HTTP_404="HTTP/1.1 404 Not Found" ; if echo $REQUEST | grep -qE '^/echo/' ; then printf "%s\n%s %s\n\n%s\n" "$HTTP_200" "$HTTP_LOCATION" $REQUEST ${REQUEST#"/echo/"} > out ; elif echo $REQUEST | grep -qE '^/date' ; then date > out ; elif echo $REQUEST | grep -qE '^/stats' ; then vmstat -S M > out ; elif echo $REQUEST | grep -qE '^/net' ; then ifconfig > out ; else printf "%s\n%s %s\n\n%s\n" "$HTTP_404" "$HTTP_LOCATION" $REQUEST "Resource $REQUEST NOT FOUND!" > out ; fi ; fi ; done) ; done
格式化版本位于
上面的API实现了以下内容:
The API above implements the following:
- /回声/ {名} 的
返回给定(名称)
$ curl -i http://localhost:1500/echo/marcello
HTTP/1.1 200 OK
Location: /echo/marcello
marcello
- /日期的
返回服务器的日期
$ curl -i http://localhost:1500/date
Sun Oct 19 14:12:27 PDT 2014
- /统计的
返回服务器的统计
$ curl -i http://localhost:1500/stats
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
r b swpd free buff cache si so bi bo in cs us sy id wa st
0 0 11 374 383 2198 0 0 6 22 33 8 2 2 97 0 0
- /净的
打印服务器的网络
$ curl -i http://localhost:1500/net
docker0 Link encap:Ethernet HWaddr 56:84:7a:fe:97:99
inet addr:172.17.42.1 Bcast:0.0.0.0 Mask:255.255.0.0
inet6 addr: fe80::5484:7aff:fefe:9799/64 Scope:Link
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:120694 errors:0 dropped:0 overruns:0 frame:0
TX packets:141757 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:272911625 (272.9 MB) TX bytes:289945068 (289.9 MB)
eth0 Link encap:Ethernet HWaddr 00:0c:29:1f:d3:b5
inet addr:192.168.248.206 Bcast:192.168.248.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe1f:d3b5/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2322493 errors:0 dropped:0 overruns:0 frame:0
TX packets:1098965 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2367412677 (2.3 GB) TX bytes:700548644 (700.5 MB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:151566 errors:0 dropped:0 overruns:0 frame:0
TX packets:151566 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:305833574 (305.8 MB) TX bytes:305833574 (305.8 MB)
- / ANYTHING /不/使用的
有关的任何服务器没有实现,它打印404消息。
For anything that the server does not implement, it prints the 404 message.
$ curl -i http://localhost:1500/wrong
HTTP/1.1 404 Not Found
Location: /wrong
Resource /wrong NOT FOUND!
下面是从上面的GIST格式化的解决方案。你可以把它保存为web.sh并运行:)
Here's the formatted solution from the GIST above. You can save it as "web.sh" and run :)
rm -f out
mkfifo out
trap "rm -f out" EXIT
while true
do
cat out | nc -l 1500 > >( # parse the netcat output, to build the answer redirected to the pipe "out".
export REQUEST=
while read line
do
line=$(echo "$line" | tr -d '[\r\n]')
if echo "$line" | grep -qE '^GET /' # if line starts with "GET /"
then
REQUEST=$(echo "$line" | cut -d ' ' -f2) # extract the request
elif [ "x$line" = x ] # empty line / end of request
then
HTTP_200="HTTP/1.1 200 OK"
HTTP_LOCATION="Location:"
HTTP_404="HTTP/1.1 404 Not Found"
# call a script here
# Note: REQUEST is exported, so the script can parse it (to answer 200/403/404 status code + content)
if echo $REQUEST | grep -qE '^/echo/'
then
printf "%s\n%s %s\n\n%s\n" "$HTTP_200" "$HTTP_LOCATION" $REQUEST ${REQUEST#"/echo/"} > out
elif echo $REQUEST | grep -qE '^/date'
then
date > out
elif echo $REQUEST | grep -qE '^/stats'
then
vmstat -S M > out
elif echo $REQUEST | grep -qE '^/net'
then
ifconfig > out
else
printf "%s\n%s %s\n\n%s\n" "$HTTP_404" "$HTTP_LOCATION" $REQUEST "Resource $REQUEST NOT FOUND!" > out
fi
fi
done
)
done
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