Module: Ocular::DSL::Etcd

Included in:
RunContext, Event::DefinitionProxy
Defined in:
lib/ocular/dsl/etcd.rb

Constant Summary collapse

@@__etcd_instance = 
nil

Instance Method Summary collapse

Instance Method Details

#etcd ⇒ Object 



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# File 'lib/ocular/dsl/etcd.rb', line 12

def etcd()
    if @@__etcd_instance
        return @@__etcd_instance
    end


    datasources = ::Ocular::Settings::get(:datasources)
    if !datasources
        raise "No etcd client settings"
    end
    settings = datasources[:etcd] || {}
    @@__etcd_instance = ::Etcd.client(
        host: (settings[:host] || "localhost"),
        port: (settings[:port] || 2379),
        user_name: (settings[:user_name] || nil),
        password: (settings[:password] || nil),
        )

    return @@__etcd_instance
end

#locked?(key) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ocular/dsl/etcd.rb', line 81

def locked?(key)
    client = etcd()
    begin
        ret = client.get("/ocular/locks/#{key}")
        if ret.node and ret.node.expiration == nil
            warn("Key #{key} has been locked permanently with value '#{ret.node.value}'!")
        end
        return ret.node.value # Key is locked
    rescue ::Etcd::KeyNotFound => e
        return nil
    end
end

#ttl_lock(key, ttl: 10) ⇒ Object 



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# File 'lib/ocular/dsl/etcd.rb', line 33

def ttl_lock(key, ttl:10)
    id = @run_id
    if !id
        id = Process.pid.to_s
        Socket.ip_address_list.each do |addr|
            next if addr.ip_address == "127.0.0.1"
            next if addr.ip_address.start_with?("::1")
            next if addr.ip_address.start_with?("fe80::1")
            id += "-" + addr.ip_address
        end
    end

    client = etcd()

    current_lock = locked?(key)

    if current_lock != id and current_lock != nil
        return nil # Somebody else has lock, can't lock by ourself
    end

    if current_lock == id and current_lock != nil
        begin
            client.test_and_set("/ocular/locks/#{key}", value: id, prevValue: id, ttl: ttl)
            return id
        rescue ::Etcd::NodeExist => e
            return nil
        end

    else
        begin
            client.create("/ocular/locks/#{key}", value: id, ttl: ttl)
            return id
        rescue ::Etcd::NodeExist => e
            return nil
        end
    end
end

#unlock(key) ⇒ Object 



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# File 'lib/ocular/dsl/etcd.rb', line 71

def unlock(key)
    client = etcd()
    begin
        client.delete("/ocular/locks/#{key}")
    rescue ::Etcd::KeyNotFound

    end
    return true
end