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[THREESCALE-2540] Fix issues with uppercase upstreams. #1044

Merged
merged 3 commits into from
May 27, 2019
Merged

[THREESCALE-2540] Fix issues with uppercase upstreams. #1044

merged 3 commits into from
May 27, 2019
+66 −3

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eloycoto
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If the proxy API backend is in uppercase it'll not work correctly and
Apicast exists with an execpetion [0]. This commit transform api_backend
always to lowercase string, so the system will not break even if
receives a uppercase string.

[0] Exception

2019/05/21 05:59:30 [error] 1037#1037: *3 lua entry thread aborted: runtime error: /home/centos/gateway/src/apicast/policy/apicast/apicast.lua:101: missing upstream
stack traceback:
coroutine 0:
        [C]: in function 'assert'
        /home/centos/gateway/src/apicast/policy/apicast/apicast.lua:101: in function </home/centos/gateway/src/apicast/policy/apicast/apicast.lua:100>
        /home/centos/gateway/src/apicast/policy_chain.lua:190: in function </home/centos/gateway/src/apicast/policy_chain.lua:187>
        /home/centos/gateway/src/apicast/policy_chain.lua:190: in function 'content'
        content_by_lua(lua_JOJems:485):1: in function <content_by_lua(lua_JOJems:485):1> while sending to client, client: 127.0.0.1, server: _, request: "GET /some-path?user_key=4e5944f11f575fd50bd6624c8d441f13 HTTP/1.1", host: "localhost:8080"

Fix THREESCALE-2540

Signed-off-by: Eloy Coto [email protected]

@eloycoto eloycoto requested a review from a team as a code owner May 21, 2019 06:18
@eloycoto eloycoto added this to the 3.6 milestone May 21, 2019
@eloycoto eloycoto force-pushed the THREESCALE-2540 branch 4 times, most recently from 1ff991f to 15dfaaa Compare May 21, 2019 12:24
eloycoto
eloycoto commented May 21, 2019
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gateway/src/apicast/policy/apicast/apicast.lua
@@ -98,6 +102,11 @@ function _M:access(context)
end

function _M:content(context)
if not context[self].upstream then
ngx.log(ngx.WARN, "Upstream server not found for this request")
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I'm not sure here, but I think that something like this need to be in place, but I'm not sure.

  ngx.status = 504
  ngx.print('')
  return exit()

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Why is this if needed? Shouldn't we treat this case like we did up until now with the assert below?

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The thing is if you have 3 services and one is not correctly set, APICast will die and other services will be affected.

With this solution, the current service will not work but others will be not affected at all.

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I think that we need a test case showing that apicast no longer crashes in that case.

mikz
mikz reviewed May 22, 2019
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gateway/src/apicast/policy/apicast/apicast.lua Outdated
context[self].upstream = p.get_upstream(service)
context[self].upstream, err = p.get_upstream(service)
if err then
ngx.log(ngx.WARN, "Backend api for the service=", service.id, " is invalid, error:", err)
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Usually, the logs start with a lower case letter, also it is more common to use : rather than =

Also, it is not really "backend api", but rather "upstream"

eloycoto added 3 commits May 27, 2019 11:48
@eloycoto
THREESCALE-2540 [Dependencies] Bump lua-resty-url to 0.3.5-1
56e70de 
Signed-off-by: Eloy Coto <[email protected]>
@eloycoto
Upstream: Log errors in case of invalid upstream.
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670d80c 
In case of a invalid upstream url log a warning error, and don't kill
all process.

Signed-off-by: Eloy Coto <[email protected]>
@eloycoto
[Test]: Validate that uppercase upstream works correctly
732d22f 
Integration test to validate that a upstream with uppercase do not crash
and works correctly.

Signed-off-by: Eloy Coto <[email protected]>
@eloycoto eloycoto requested review from davidor and mikz May 27, 2019 10:09
mikz
mikz approved these changes May 27, 2019
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Excellent 👍

@davidor davidor merged commit ee32f84 into 3scale:master May 27, 2019
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