Service Discovery support for etcd v3 #663
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This adds a go-kit/kit/sd implementation for etcd/clientv3. All tests except the client_test were ported over. I have removed the client tests because they are more problematic with regards to etcd v3. The etcd maintainers switched to protobufs in v3 and placed those generated messages under internal/, which would cause issues trying to reference it (see https://golang.org/s/go14internal). This makes stubbing clientv3.KV more difficult without burying the implementation behind interfaces to remove the direct dependence on those internal packages. Features in use with v3: - Support for etcd/clientv3.Watcher - Support for etcd/clientv3.Lease (TTL) - Username/password support
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Very cool! I'll give this a review in the next day or two. Thanks! |
peterbourgon
requested changes
Feb 12, 2018
sd/etcdv3/client.go
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| // ErrNoValue indicates a client method needs a value but receives none. | ||
| ErrNoValue = errors.New("no value provided") | ||
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| ErrKeyNotFound = errors.New("requested key not found") |
sd/etcdv3/client.go
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| c.wcf() | ||
| } | ||
| return nil | ||
| } |
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Does this function need to return an error?
| @@ -0,0 +1 @@ | |||
| package etcdv3 | |||
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One or two sentences of doc comment would be appreciated!
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I copied and updated the doc comment from sd/etcd to sd/etcdv3 for consistency sake.
sd/etcdv3/registrar.go
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| // return | ||
| // } | ||
| // } | ||
| // } |
sd/etcdv3/registrar_test.go
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| func (tc *testClient) CancelWatch() {} | ||
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| func (tc *testClient) WatchPrefix(prefix string, ch chan struct{}) { | ||
| } |
sd/etcdv3/registrar_test.go
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| {errors.New("regError"), "key=testKey value=testValue err=regError\n"}, | ||
| // test case: registration successful | ||
| {nil, "key=testKey value=testValue action=register\n"}, | ||
| } |
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Can you define this in the test function rather than in the global scope?
sd/etcdv3/registrar_test.go
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| {errors.New("deregError"), "key=testKey value=testValue err=deregError\n"}, | ||
| // test case: deregistration successful | ||
| {nil, "key=testKey value=testValue action=deregister\n"}, | ||
| } |
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Can you define this in the test function rather than in the global scope?
- moved global structs inside of test functions since they are not used anywhere else - moved unused Err variable - removed error return type from close() - added doc comment
peterbourgon
approved these changes
Feb 15, 2018
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Thank you very much! |
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This adds a go-kit/kit/sd implementation for etcd/clientv3, which was requested in #505
All tests except the client_test were ported over which I had to remove because they are more problematic with regards to etcd v3. The etcd maintainers switched to protobufs in v3 and placed those generated messages under internal/, which would cause issues trying to reference it (see https://golang.org/s/go14internal), this makes stubbing clientv3.KV more difficult without burying the
implementation behind interfaces to remove the direct dependence on those internal packages.
Features in use with v3: