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request: in the event of failure, try other IPs (#6761) (#6813)

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* request: in the event of failure, try other IPs (#6761)

In the case where a name has multiple A/AAAA records, we should
try subsequent records instead of immediately failing when we have a
failure on the first IP address.

This significantly improves delivery success when there are network
connectivity problems affecting only IPv4 or IPv6.

* fix method call style

* request_spec: adjust test case to use Addrinfo

* request: Request/open: move private addr check to within begin/rescue

* request_spec: add case to test failover, fix exception check

* Double Addrinfo.foreach so that it correctly yields instances
This commit is contained in:
Rey Tucker 2018-03-20 04:06:08 -04:00 committed by Eugen Rochko
parent ff6b8a6443
commit 36b5703796
2 changed files with 20 additions and 4 deletions
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13
app/lib/request.rb
View File

@ -94,9 +94,16 @@ class Request
class Socket < TCPSocket
class << self
def open(host, *args)
address = IPSocket.getaddress(host)
raise Mastodon::HostValidationError if PrivateAddressCheck.private_address? IPAddr.new(address)
super address, *args
outer_e = nil
Addrinfo.foreach(host, nil, nil, :SOCK_STREAM) do |address|
begin
raise Mastodon::HostValidationError if PrivateAddressCheck.private_address? IPAddr.new(address.ip_address)
return super address.ip_address, *args
rescue => e
outer_e = e
end
end
raise outer_e if outer_e
end
alias new open

11
spec/lib/request_spec.rb
View File

@ -48,6 +48,13 @@ describe Request do
expect(a_request(:get, 'http://example.com')).to have_been_made.once
end
it 'executes a HTTP request when the first address is private' do
allow(Addrinfo).to receive(:foreach).with('example.com', nil, nil, :SOCK_STREAM)
.and_yield(Addrinfo.new(["AF_INET", 0, "example.com", "0.0.0.0"], :PF_INET, :SOCK_STREAM))
.and_yield(Addrinfo.new(["AF_INET6", 0, "example.com", "2001:4860:4860::8844"], :PF_INET6, :SOCK_STREAM))
expect(a_request(:get, 'http://example.com')).to have_been_made.once
end
it 'sets headers' do
expect(a_request(:get, 'http://example.com').with(headers: subject.headers)).to have_been_made
end
@ -61,7 +68,9 @@ describe Request do
end
it 'raises Mastodon::ValidationError' do
allow(IPSocket).to receive(:getaddress).with('example.com').and_return('0.0.0.0')
allow(Addrinfo).to receive(:foreach).with('example.com', nil, nil, :SOCK_STREAM)
.and_yield(Addrinfo.new(["AF_INET", 0, "example.com", "0.0.0.0"], :PF_INET, :SOCK_STREAM))
.and_yield(Addrinfo.new(["AF_INET6", 0, "example.com", "2001:db8::face"], :PF_INET6, :SOCK_STREAM))
expect{ subject.perform }.to raise_error Mastodon::ValidationError
end
end