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feat: Add L7 HTTP reverse proxy mode to HAProxy

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Extend HAProxy config generation to support L7 HTTP routes alongside
existing L4 SNI passthrough routes. This enables Wild Works services
to be reverse-proxied with TLS termination by Central while Wild Cloud
k8s instances continue using L4 SNI passthrough.

- Add HTTPRoute type: domain, backend address, optional health path
- Add GenerateWithOpts for full config options (HTTP routes, wildcard cert)
- L4 SNI frontend routes known Cloud domains to k8s LBs; unknown SNIs
  fall through to L7 TLS-termination frontend for Host-based routing
- L7 frontend terminates TLS with wildcard cert, routes by Host header
- Health check support via HAProxy httpchk
- Backward compatible: existing Generate() works unchanged
- 3 new tests (L7-only, mixed L4+L7, backward compat)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Paul Payne
2026-07-08 23:39:30 +00:00
parent 6b58ebb692
commit c47689c3f2
2 changed files with 195 additions and 13 deletions
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112
internal/haproxy/config.go
View File

@@ -27,6 +27,15 @@ type CustomRoute struct {
Backend string // e.g. "192.168.8.10:22"
}
// HTTPRoute represents an L7 HTTP reverse proxy route (for Wild Works services).
// Central terminates TLS using a wildcard certificate and proxies by Host header.
type HTTPRoute struct {
Name string // e.g. "my-api"
Domain string // e.g. "my-api.payne.io"
Backend string // e.g. "192.168.8.60:9001"
HealthPath string // e.g. "/health" (optional, for active health checks)
}
const defaultConfigPath = "/etc/haproxy/haproxy.cfg"
const defaultSocketPath = "/var/run/haproxy/admin.sock"
@@ -54,11 +63,32 @@ func (m *Manager) GetConfigPath() string {
return m.configPath
}
// GenerateOpts holds optional parameters for HAProxy config generation.
type GenerateOpts struct {
CentralDomain string // if set, central's own domain is SNI-routed to local TLS frontend
HTTPRoutes []HTTPRoute // L7 HTTP reverse proxy routes (TLS terminated by Central)
WildcardCert string // path to wildcard cert PEM for L7 TLS termination
}
// Generate creates a complete HAProxy configuration from instance routes, custom routes,
// and an optional central domain. Uses L4 TCP mode with SNI inspection for HTTPS —
// TLS terminates at each k8s cluster's traefik (or nginx for central).
// centralDomain, if non-empty, is routed via SNI to local nginx:443 before instance ACLs.
// and optional config. Uses L4 TCP mode with SNI inspection for HTTPS —
// TLS terminates at each k8s cluster's traefik. HTTP routes add an L7 frontend
// where Central terminates TLS with a wildcard cert and reverse-proxies by Host header.
func (m *Manager) Generate(instances []InstanceRoute, custom []CustomRoute, centralDomain ...string) string {
return m.GenerateWithOpts(instances, custom, GenerateOpts{
CentralDomain: firstOrEmpty(centralDomain),
})
}
func firstOrEmpty(s []string) string {
if len(s) > 0 {
return s[0]
}
return ""
}
// GenerateWithOpts creates a complete HAProxy configuration with full options.
func (m *Manager) GenerateWithOpts(instances []InstanceRoute, custom []CustomRoute, opts GenerateOpts) string {
var sb strings.Builder
sb.WriteString(`# Wild Cloud HAProxy Configuration
@@ -96,7 +126,9 @@ frontend http_in
`)
if len(instances) > 0 {
hasL4Routes := len(instances) > 0 || opts.CentralDomain != "" || len(opts.HTTPRoutes) > 0
if hasL4Routes {
sb.WriteString("# HTTPS: SNI-based L4 routing (TLS passes through to k8s traefik)\n")
sb.WriteString("frontend https_in\n")
sb.WriteString(" bind *:443\n")
@@ -105,17 +137,16 @@ frontend http_in
sb.WriteString(" tcp-request content accept if { req_ssl_hello_type 1 }\n")
sb.WriteString("\n")
// Central domain: SNI routes to local TLS-terminating frontend before instance wildcards
if len(centralDomain) > 0 && centralDomain[0] != "" {
fmt.Fprintf(&sb, " acl is_central req_ssl_sni -m str %s\n", centralDomain[0])
// Central domain: SNI routes to local TLS-terminating frontend
if opts.CentralDomain != "" {
fmt.Fprintf(&sb, " acl is_central req_ssl_sni -m str %s\n", opts.CentralDomain)
sb.WriteString(" use_backend be_central_tls if is_central\n")
sb.WriteString("\n")
}
// Instance routes: L4 SNI passthrough to k8s load balancers
for _, inst := range instances {
aclName := "is_" + sanitizeName(inst.Name)
// Two ACL lines with the same name combine with OR:
// match subdomain (*.cloud.payne.io) and exact domain (cloud.payne.io)
fmt.Fprintf(&sb, " acl %s req_ssl_sni -m end .%s\n", aclName, inst.Domain)
fmt.Fprintf(&sb, " acl %s req_ssl_sni -m str %s\n", aclName, inst.Domain)
for _, extra := range inst.ExtraDomains {
@@ -126,19 +157,34 @@ frontend http_in
sb.WriteString("\n")
}
// HTTP route SNI ACLs: route to L7 TLS-termination frontend
if len(opts.HTTPRoutes) > 0 {
for _, route := range opts.HTTPRoutes {
aclName := "is_l7_" + sanitizeName(route.Name)
fmt.Fprintf(&sb, " acl %s req_ssl_sni -m str %s\n", aclName, route.Domain)
}
sb.WriteString(" acl is_l7 req_ssl_sni -m found\n")
sb.WriteString(" use_backend be_l7_termination if is_l7\n")
sb.WriteString("\n")
}
// Fallback: any remaining SNI goes to L7 termination (if we have HTTP routes)
if len(opts.HTTPRoutes) > 0 {
sb.WriteString(" default_backend be_l7_termination\n")
}
sb.WriteString("\n")
// Central: TCP passthrough to local TLS-terminating frontend
if len(centralDomain) > 0 && centralDomain[0] != "" {
// Central TLS-terminating backend and frontend
if opts.CentralDomain != "" {
sb.WriteString("backend be_central_tls\n")
sb.WriteString(" mode tcp\n")
sb.WriteString(" server s0 127.0.0.1:4443\n")
sb.WriteString("\n")
// TLS-terminating frontend for central domain → proxy to Go API
sb.WriteString("# Wild Central: TLS termination for management UI\n")
sb.WriteString("frontend central_https\n")
fmt.Fprintf(&sb, " bind 127.0.0.1:4443 ssl crt /etc/haproxy/certs/%s.pem\n", centralDomain[0])
fmt.Fprintf(&sb, " bind 127.0.0.1:4443 ssl crt /etc/haproxy/certs/%s.pem\n", opts.CentralDomain)
sb.WriteString(" mode http\n")
sb.WriteString(" default_backend be_central_http\n")
sb.WriteString("\n")
@@ -148,6 +194,7 @@ frontend http_in
sb.WriteString("\n")
}
// Instance L4 backends
for _, inst := range instances {
fmt.Fprintf(&sb, "backend be_https_%s\n", sanitizeName(inst.Name))
sb.WriteString(" mode tcp\n")
@@ -155,6 +202,45 @@ frontend http_in
fmt.Fprintf(&sb, " server s0 %s:443 check\n", inst.BackendIP)
sb.WriteString("\n")
}
// L7 TLS termination backend + frontend (for HTTP routes)
if len(opts.HTTPRoutes) > 0 {
certPath := opts.WildcardCert
if certPath == "" {
certPath = "/etc/haproxy/certs/wildcard.pem"
}
sb.WriteString("backend be_l7_termination\n")
sb.WriteString(" mode tcp\n")
sb.WriteString(" server s0 127.0.0.1:8443\n")
sb.WriteString("\n")
sb.WriteString("# L7 HTTP frontend: TLS termination + Host-based routing\n")
sb.WriteString("frontend l7_https\n")
fmt.Fprintf(&sb, " bind 127.0.0.1:8443 ssl crt %s\n", certPath)
sb.WriteString(" mode http\n")
sb.WriteString("\n")
for _, route := range opts.HTTPRoutes {
aclName := "host_" + sanitizeName(route.Name)
fmt.Fprintf(&sb, " acl %s hdr(host) -i %s\n", aclName, route.Domain)
fmt.Fprintf(&sb, " use_backend be_l7_%s if %s\n", sanitizeName(route.Name), aclName)
}
sb.WriteString("\n")
// L7 backends
for _, route := range opts.HTTPRoutes {
fmt.Fprintf(&sb, "backend be_l7_%s\n", sanitizeName(route.Name))
sb.WriteString(" mode http\n")
if route.HealthPath != "" {
fmt.Fprintf(&sb, " option httpchk GET %s\n", route.HealthPath)
fmt.Fprintf(&sb, " server s0 %s check\n", route.Backend)
} else {
fmt.Fprintf(&sb, " server s0 %s\n", route.Backend)
}
sb.WriteString("\n")
}
}
}
for _, route := range custom {