// constructLine transforms tokens into a JSON-encodable structure;
// but only one line at a time, to be used at the top-level of
// a server block only (where the first token on each line is a
// directive) - not to be used at any other nesting level.
func constructLine(d parse.Dispenser) interface{} {
var args []interface{}
all := d.RemainingArgs()
for _, arg := range all {
args = append(args, arg)
}
d.Next()
if d.Val() == "{" {
args = append(args, constructBlock(d))
}
return args
}
// 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: "",
upstreamHeaders: make(http.Header),
downstreamHeaders: make(http.Header),
Hosts: nil,
Policy: &Random{},
FailTimeout: 10 * time.Second,
MaxFails: 1,
MaxConns: 0,
}
if !c.Args(&upstream.from) {
return upstreams, c.ArgErr()
}
to := c.RemainingArgs()
if len(to) == 0 {
return upstreams, c.ArgErr()
}
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, err := upstream.NewHost(host)
if err != nil {
return upstreams, err
}
upstream.Hosts[i] = uh
}
if upstream.HealthCheck.Path != "" {
go upstream.HealthCheckWorker(nil)
}
upstreams = append(upstreams, upstream)
}
return upstreams, nil
}
// constructBlock recursively processes tokens into a
// JSON-encodable structure.
func constructBlock(d parse.Dispenser) interface{} {
block := make(map[string]interface{})
for d.Next() {
if d.Val() == "}" {
break
}
dir := d.Val()
all := d.RemainingArgs()
var args []interface{}
for _, arg := range all {
args = append(args, arg)
}
if d.Val() == "{" {
args = append(args, constructBlock(d))
}
block[dir] = args
}
return block
}
// 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: "",
proxyHeaders: make(http.Header),
hiddenHeaders: make(http.Header),
Hosts: nil,
Policy: &Random{},
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 c.NextBlock() {
if err := parseBlock(&c, upstream); err != nil {
return upstreams, err
}
}
upstream.Hosts = make([]*UpstreamHost, len(to))
for i, host := range to {
if !strings.HasPrefix(host, "http") &&
!strings.HasPrefix(host, "unix:") {
host = "http://" + host
}
uh := &UpstreamHost{
Name: host,
Conns: 0,
Fails: 0,
FailTimeout: upstream.FailTimeout,
Unhealthy: false,
ExtraHeaders: upstream.proxyHeaders,
HiddenHeaders: upstream.hiddenHeaders,
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,
}
if baseURL, err := url.Parse(uh.Name); err == nil {
uh.ReverseProxy = NewSingleHostReverseProxy(baseURL, uh.WithoutPathPrefix)
if upstream.insecureSkipVerify {
uh.ReverseProxy.Transport = InsecureTransport
}
} else {
return upstreams, err
}
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()
}
u.HealthCheck.Path = c.Val()
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 "proxy_header":
var header, value string
if !c.Args(&header, &value) {
return c.ArgErr()
}
u.proxyHeaders.Add(header, value)
case "hide_header":
var header, value string
if !c.Args(&header, &value) {
return c.ArgErr()
}
u.hiddenHeaders.Add(header, value)
case "websocket":
u.proxyHeaders.Add("Connection", "{>Connection}")
u.proxyHeaders.Add("Upgrade", "{>Upgrade}")
case "without":
if !c.NextArg() {
return c.ArgErr()
}
u.WithoutPathPrefix = c.Val()
case "except":
ignoredPaths := c.RemainingArgs()
if len(ignoredPaths) == 0 {
return c.ArgErr()
}
u.IgnoredSubPaths = ignoredPaths
case "insecure_skip_verify":
u.insecureSkipVerify = true
default:
return c.Errf("unknown property '%s'", c.Val())
}
return nil
}