Misleading Error about Invalid Hostname when port not included

[darkn3rd]

CONFIGURATION

Dgraph Version: v20.03.1
OS: Ubuntu 18.04.3 LTS

$ grep $(hostname -f) /etc/hosts 
127.0.1.1	ubuntu1804.localdomain
127.0.0.1 ubuntu1804.localdomain

STEPS TO REPRODUCE

curl -sSf https://get.dgraph.io | ACCEPT_LICENSE=y VERSION=v20.03.1 bash
dgraph zero --my="$(hostname -f):5080" --idx 1
dgraph alpha --my=$(hostname -f) --zero $(hostname -f):5080 -lru_mb 2048

EXPECTED RESULT

An error message about the port not existing, or default it to 7080.

ACTUAL RESULT

2020/05/02 00:38:02 ubuntu1804.localdomain is not valid address
github.com/dgraph-io/dgraph/x.AssertTruef
	/ext-go/1/src/github.com/dgraph-io/dgraph/x/error.go:101
github.com/dgraph-io/dgraph/worker.StartRaftNodes
	/ext-go/1/src/github.com/dgraph-io/dgraph/worker/groups.go:83
github.com/dgraph-io/dgraph/dgraph/cmd/alpha.run.func4
	/ext-go/1/src/github.com/dgraph-io/dgraph/dgraph/cmd/alpha/run.go:663
runtime.goexit
	/usr/local/go/src/runtime/asm_amd64.s:1373

[danielmai]

The default for the --my option is set to localhost:7080. We shouldn't try to be smart and fill in a default port if only that part is missing.

We can improve the error messaging for this. In this case, the port is wrong, so the error message should say that.

[SezalAgrawal]

@danielmai Can I pick this task?

[minhaj-shakeel]

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