Ejemplo n.º 1
0
// NewStaticUpstreams parses the configuration input and sets up
// static upstreams for the proxy middleware.
func NewStaticUpstreams(c parse.Dispenser) ([]Upstream, error) {
	var upstreams []Upstream
	for c.Next() {
		upstream := &staticUpstream{
			from:        "",
			Hosts:       nil,
			Policy:      &Random{},
			Spray:       nil,
			FailTimeout: 10 * time.Second,
			MaxFails:    1,
		}

		if !c.Args(&upstream.from) {
			return upstreams, c.ArgErr()
		}
		to := c.RemainingArgs()
		if len(to) == 0 {
			return upstreams, c.ArgErr()
		}
		for _, host := range to {
			h, _, err := net.SplitHostPort(host)
			if err != nil {
				h = host
			}
			if x := net.ParseIP(h); x == nil {
				return upstreams, fmt.Errorf("not an IP address: `%s'", h)
			}
		}

		for c.NextBlock() {
			if err := parseBlock(&c, upstream); err != nil {
				return upstreams, err
			}
		}

		upstream.Hosts = make([]*UpstreamHost, len(to))
		for i, host := range to {
			uh := &UpstreamHost{
				Name:        defaultHostPort(host),
				Conns:       0,
				Fails:       0,
				FailTimeout: upstream.FailTimeout,
				Unhealthy:   false,
				CheckDown: func(upstream *staticUpstream) UpstreamHostDownFunc {
					return func(uh *UpstreamHost) bool {
						if uh.Unhealthy {
							return true
						}
						if uh.Fails >= upstream.MaxFails &&
							upstream.MaxFails != 0 {
							return true
						}
						return false
					}
				}(upstream),
				WithoutPathPrefix: upstream.WithoutPathPrefix,
			}
			upstream.Hosts[i] = uh
		}

		if upstream.HealthCheck.Path != "" {
			go upstream.HealthCheckWorker(nil)
		}
		upstreams = append(upstreams, upstream)
	}
	return upstreams, nil
}
Ejemplo n.º 2
0
func parseBlock(c *parse.Dispenser, u *staticUpstream) error {
	switch c.Val() {
	case "policy":
		if !c.NextArg() {
			return c.ArgErr()
		}
		policyCreateFunc, ok := supportedPolicies[c.Val()]
		if !ok {
			return c.ArgErr()
		}
		u.Policy = policyCreateFunc()
	case "fail_timeout":
		if !c.NextArg() {
			return c.ArgErr()
		}
		dur, err := time.ParseDuration(c.Val())
		if err != nil {
			return err
		}
		u.FailTimeout = dur
	case "max_fails":
		if !c.NextArg() {
			return c.ArgErr()
		}
		n, err := strconv.Atoi(c.Val())
		if err != nil {
			return err
		}
		u.MaxFails = int32(n)
	case "health_check":
		if !c.NextArg() {
			return c.ArgErr()
		}
		var err error
		u.HealthCheck.Path, u.HealthCheck.Port, err = net.SplitHostPort(c.Val())
		if err != nil {
			return err
		}
		u.HealthCheck.Interval = 30 * time.Second
		if c.NextArg() {
			dur, err := time.ParseDuration(c.Val())
			if err != nil {
				return err
			}
			u.HealthCheck.Interval = dur
		}
	case "without":
		if !c.NextArg() {
			return c.ArgErr()
		}
		u.WithoutPathPrefix = c.Val()
	case "except":
		ignoredDomains := c.RemainingArgs()
		if len(ignoredDomains) == 0 {
			return c.ArgErr()
		}
		for i := 0; i < len(ignoredDomains); i++ {
			ignoredDomains[i] = strings.ToLower(dns.Fqdn(ignoredDomains[i]))
		}
		u.IgnoredSubDomains = ignoredDomains
	case "spray":
		u.Spray = &Spray{}

	default:
		return c.Errf("unknown property '%s'", c.Val())
	}
	return nil
}