// 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
}
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
}