Feature #13677: Add more details to error "Name or service not known (SocketError)" - Ruby - Ruby Issue Tracking System

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Feature #13677

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Add more details to error "Name or service not known (SocketError)"

Added by dsbonev (Dimitar Bonev) almost 8 years ago. Updated about 6 years ago.

Status:

Feedback

Assignee:

Target version:

[ruby-core:81759]

Description

ruby version: ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-linux]

ruby script:

require 'socket'
TCPSocket.new 'nonexistent.example.com', 80

Result: getaddrinfo: Name or service not known (SocketError)

Expected: getaddrinfo: Name or service not known for nonexistent.example.com (SocketError)

Why:
This will make it easier to resolve errors of this kind by just looking at the logged messages. It is common for production and non-production (development, test) code to connect to different hosts which can produce errors due to wrong configuration.
This change will make the ruby stdlib code more consistent as other methods already provide useful error information. Some examples:

host = 'nonexistent.example.com'; port = 80
Resolv.getaddress host # => Resolv::ResolvError: no address for nonexistent.example.com
Socket.getservbyname host # => SocketError: no such service nonexistent.example.com/tcp
Net::HTTP.get Struct.new(:hostname, :port, :scheme).new(host, port, 'http') # => SocketError: Failed to open TCP connection to nonexistent.example.com:80 (getaddrinfo: Name or service not known)

If this issue will be resolved, please add any useful information to the error message in addition to the host.

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#1 [ruby-core:81762]

Updated by shevegen (Robert A. Heiler) almost 8 years ago

In general I agree that error messages should be as useful as possible.

(By the way, I think if you indent ruby code here in the bug tracker with four space tokens
on the left side aka ' ', colouring will be enabled. Would make it easier for others to
read it... let me try it).

host = 'nonexistent.example.com'; port = 80
Resolv.getaddress host # => Resolv::ResolvError: no address for nonexistent.example.com
Socket.getservbyname host # => SocketError: no such service nonexistent.example.com/tcp
Net::HTTP.get Struct.new(:hostname, :port, :scheme).new(host, port, 'http') # => SocketError: Failed to open TCP connection to nonexistent.example.com:80 (getaddrinfo: Name or service not known)

Edit: Oops not quite ... only indents to the left side as blockquote or so...

    host = 'nonexistent.example.com'; port = 80
    Resolv.getaddress host # => Resolv::ResolvError: no address for nonexistent.example.com
    Socket.getservbyname host # => SocketError: no such service nonexistent.example.com/tcp
    Net::HTTP.get Struct.new(:hostname, :port, :scheme).new(host, port, 'http') # => SocketError: Failed to open TCP connection to nonexistent.example.com:80 (getaddrinfo: Name or service not known)