Template dynamicAdvertisedListener, allow {{.brokerId}} for a dynamic…

Makefile

@@ -10,7 +10,7 @@ VERSION       ?= $(shell git describe --tags --always --dirty)
 GOPKGS         = $(shell go list ./... | grep -v /vendor/)
 BUILD_FLAGS   ?=
 LDFLAGS       ?= -X github.com/grepplabs/kafka-proxy/config.Version=$(VERSION) -w -s
-TAG           ?= "v0.4.0"
+TAG           ?= "v0.4.1"
 GOOS          ?= $(if $(TARGETOS),$(TARGETOS),linux)
 GOARCH        ?= $(if $(TARGETARCH),$(TARGETARCH),amd64)
 GOARM         ?= $(TARGETVARIANT)

README.md

@@ -48,11 +48,11 @@ As not every Kafka release adds new messages/versions which are relevant to the
 
    Linux
 
-        curl -Ls https://github.com/grepplabs/kafka-proxy/releases/download/v0.4.0/kafka-proxy-v0.4.0-linux-amd64.tar.gz | tar xz
+        curl -Ls https://github.com/grepplabs/kafka-proxy/releases/download/v0.4.1/kafka-proxy-v0.4.1-linux-amd64.tar.gz | tar xz
 
    macOS
 
-        curl -Ls https://github.com/grepplabs/kafka-proxy/releases/download/v0.4.0/kafka-proxy-v0.4.0-darwin-amd64.tar.gz | tar xz
+        curl -Ls https://github.com/grepplabs/kafka-proxy/releases/download/v0.4.1/kafka-proxy-v0.4.1-darwin-amd64.tar.gz | tar xz
 
 2. Move the binary in to your PATH.
 
@@ -70,7 +70,7 @@ Docker images are available on [Docker Hub](https://hub.docker.com/r/grepplabs/k
 
 You can launch a kafka-proxy container for trying it out with
 
-    docker run --rm -p 30001-30003:30001-30003 grepplabs/kafka-proxy:0.4.0 \
+    docker run --rm -p 30001-30003:30001-30003 grepplabs/kafka-proxy:0.4.1 \
               server \
             --bootstrap-server-mapping "localhost:19092,0.0.0.0:30001" \
             --bootstrap-server-mapping "localhost:29092,0.0.0.0:30002" \
@@ -89,7 +89,7 @@ Docker images with precompiled plugins located in `/opt/kafka-proxy/bin/` are ta
 
 You can launch a kafka-proxy container with auth-ldap plugin for trying it out with
 
-    docker run --rm -p 30001-30003:30001-30003 grepplabs/kafka-proxy:0.4.0-all \
+    docker run --rm -p 30001-30003:30001-30003 grepplabs/kafka-proxy:0.4.1-all \
                   server \
                 --bootstrap-server-mapping "localhost:19092,0.0.0.0:30001" \
                 --bootstrap-server-mapping "localhost:29092,0.0.0.0:30002" \
@@ -142,7 +142,7 @@ You can launch a kafka-proxy container with auth-ldap plugin for trying it out w
             --default-listener-ip string                           Default listener IP (default "0.0.0.0")
             --deterministic-listeners                              Enable deterministic listeners (listener port = min port + broker id).
             --dial-address-mapping stringArray                     Mapping of target broker address to new one (host:port,host:port). The mapping is performed during connection establishment
-            --dynamic-advertised-listener string                   Advertised address for dynamic listeners. If empty, default-listener-ip is used
+            --dynamic-advertised-listener string                   Advertised address for dynamic listeners. If left empty, default-listener-ip is used. Supports templating with {{.brokerId}} for dynamic hostnames and a fixed port if provided.
             --dynamic-listeners-disable                            Disable dynamic listeners.
             --dynamic-sequential-min-port int                      If set to non-zero, makes the dynamic listener use a sequential port starting with this value rather than a random port every time.
             --external-server-mapping stringArray                  Mapping of Kafka server address to external address (host:port,host:port). A listener for the external address is not started

cmd/kafka-proxy/server.go

@@ -87,7 +87,7 @@ func init() {
 func initFlags() {
 	// proxy
 	Server.Flags().StringVar(&c.Proxy.DefaultListenerIP, "default-listener-ip", "0.0.0.0", "Default listener IP")
-	Server.Flags().StringVar(&c.Proxy.DynamicAdvertisedListener, "dynamic-advertised-listener", "", "Advertised address for dynamic listeners. If empty, default-listener-ip is used")
+	Server.Flags().StringVar(&c.Proxy.DynamicAdvertisedListener, "dynamic-advertised-listener", "", "Advertised address for dynamic listeners. If left empty, default-listener-ip is used. Supports templating with {{.brokerId}} for dynamic hostnames and a fixed port if provided.")
 	Server.Flags().StringArrayVar(&bootstrapServersMapping, "bootstrap-server-mapping", []string{}, "Mapping of Kafka bootstrap server address to local address (host:port,host:port(,advhost:advport))")
 	Server.Flags().StringArrayVar(&externalServersMapping, "external-server-mapping", []string{}, "Mapping of Kafka server address to external address (host:port,host:port). A listener for the external address is not started")
 	Server.Flags().StringArrayVar(&dialAddressMapping, "dial-address-mapping", []string{}, "Mapping of target broker address to new one (host:port,host:port). The mapping is performed during connection establishment")

go.mod

@@ -6,6 +6,8 @@ require (
 	github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5
 	github.com/aws/aws-sdk-go-v2 v1.36.1
 	github.com/aws/aws-sdk-go-v2/config v1.29.6
+	github.com/aws/aws-sdk-go-v2/credentials v1.17.59
+	github.com/aws/aws-sdk-go-v2/service/sts v1.33.14
 	github.com/cenkalti/backoff v1.1.0
 	github.com/elazarl/goproxy v0.0.0-20230808193330-2592e75ae04a
 	github.com/elazarl/goproxy/ext v0.0.0-20190711103511-473e67f1d7d2
@@ -37,7 +39,6 @@ require (
 require (
 	cloud.google.com/go/compute/metadata v0.5.2 // indirect
 	github.com/Azure/go-ntlmssp v0.0.0-20200615164410-66371956d46c // indirect
-	github.com/aws/aws-sdk-go-v2/credentials v1.17.59 // indirect
 	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.28 // indirect
 	github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.32 // indirect
 	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.6.32 // indirect
@@ -46,7 +47,6 @@ require (
 	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.12.13 // indirect
 	github.com/aws/aws-sdk-go-v2/service/sso v1.24.15 // indirect
 	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.28.14 // indirect
-	github.com/aws/aws-sdk-go-v2/service/sts v1.33.14 // indirect
 	github.com/aws/smithy-go v1.22.2 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect

go.sum

@@ -14,54 +14,30 @@ github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk5
 github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
 github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5 h1:0CwZNZbxp69SHPdPJAN/hZIm0C4OItdklCFmMRWYpio=
 github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5/go.mod h1:wHh0iHkYZB8zMSxRWpUBQtwG5a7fFgvEO+odwuTv2gs=
-github.com/aws/aws-sdk-go-v2 v1.17.2 h1:r0yRZInwiPBNpQ4aDy/Ssh3ROWsGtKDwar2JS8Lm+N8=
-github.com/aws/aws-sdk-go-v2 v1.17.2/go.mod h1:uzbQtefpm44goOPmdKyAlXSNcwlRgF3ePWVW6EtJvvw=
 github.com/aws/aws-sdk-go-v2 v1.36.1 h1:iTDl5U6oAhkNPba0e1t1hrwAo02ZMqbrGq4k5JBWM5E=
 github.com/aws/aws-sdk-go-v2 v1.36.1/go.mod h1:5PMILGVKiW32oDzjj6RU52yrNrDPUHcbZQYr1sM7qmM=
-github.com/aws/aws-sdk-go-v2/config v1.18.4 h1:VZKhr3uAADXHStS/Gf9xSYVmmaluTUfkc0dcbPiDsKE=
-github.com/aws/aws-sdk-go-v2/config v1.18.4/go.mod h1:EZxMPLSdGAZ3eAmkqXfYbRppZJTzFTkv8VyEzJhKko4=
 github.com/aws/aws-sdk-go-v2/config v1.29.6 h1:fqgqEKK5HaZVWLQoLiC9Q+xDlSp+1LYidp6ybGE2OGg=
 github.com/aws/aws-sdk-go-v2/config v1.29.6/go.mod h1:Ft+WLODzDQmCTHDvqAH1JfC2xxbZ0MxpZAcJqmE1LTQ=
-github.com/aws/aws-sdk-go-v2/credentials v1.13.4 h1:nEbHIyJy7mCvQ/kzGG7VWHSBpRB4H6sJy3bWierWUtg=
-github.com/aws/aws-sdk-go-v2/credentials v1.13.4/go.mod h1:/Cj5w9LRsNTLSwexsohwDME32OzJ6U81Zs33zr2ZWOM=
 github.com/aws/aws-sdk-go-v2/credentials v1.17.59 h1:9btwmrt//Q6JcSdgJOLI98sdr5p7tssS9yAsGe8aKP4=
 github.com/aws/aws-sdk-go-v2/credentials v1.17.59/go.mod h1:NM8fM6ovI3zak23UISdWidyZuI1ghNe2xjzUZAyT+08=
-github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.12.20 h1:tpNOglTZ8kg9T38NpcGBxudqfUAwUzyUnLQ4XSd0CHE=
-github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.12.20/go.mod h1:d9xFpWd3qYwdIXM0fvu7deD08vvdRXyc/ueV+0SqaWE=
 github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.28 h1:KwsodFKVQTlI5EyhRSugALzsV6mG/SGrdjlMXSZSdso=
 github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.28/go.mod h1:EY3APf9MzygVhKuPXAc5H+MkGb8k/DOSQjWS0LgkKqI=
-github.com/aws/aws-sdk-go-v2/internal/configsources v1.1.26 h1:5WU31cY7m0tG+AiaXuXGoMzo2GBQ1IixtWa8Yywsgco=
-github.com/aws/aws-sdk-go-v2/internal/configsources v1.1.26/go.mod h1:2E0LdbJW6lbeU4uxjum99GZzI0ZjDpAb0CoSCM0oeEY=
 github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.32 h1:BjUcr3X3K0wZPGFg2bxOWW3VPN8rkE3/61zhP+IHviA=
 github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.32/go.mod h1:80+OGC/bgzzFFTUmcuwD0lb4YutwQeKLFpmt6hoWapU=
-github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.4.20 h1:WW0qSzDWoiWU2FS5DbKpxGilFVlCEJPwx4YtjdfI0Jw=
-github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.4.20/go.mod h1:/+6lSiby8TBFpTVXZgKiN/rCfkYXEGvhlM4zCgPpt7w=
 github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.6.32 h1:m1GeXHVMJsRsUAqG6HjZWx9dj7F5TR+cF1bjyfYyBd4=
 github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.6.32/go.mod h1:IitoQxGfaKdVLNg0hD8/DXmAqNy0H4K2H2Sf91ti8sI=
-github.com/aws/aws-sdk-go-v2/internal/ini v1.3.27 h1:N2eKFw2S+JWRCtTt0IhIX7uoGGQciD4p6ba+SJv4WEU=
-github.com/aws/aws-sdk-go-v2/internal/ini v1.3.27/go.mod h1:RdwFVc7PBYWY33fa2+8T1mSqQ7ZEK4ILpM0wfioDC3w=
 github.com/aws/aws-sdk-go-v2/internal/ini v1.8.2 h1:Pg9URiobXy85kgFev3og2CuOZ8JZUBENF+dcgWBaYNk=
 github.com/aws/aws-sdk-go-v2/internal/ini v1.8.2/go.mod h1:FbtygfRFze9usAadmnGJNc8KsP346kEe+y2/oyhGAGc=
 github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.12.2 h1:D4oz8/CzT9bAEYtVhSBmFj2dNOtaHOtMKc2vHBwYizA=
 github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.12.2/go.mod h1:Za3IHqTQ+yNcRHxu1OFucBh0ACZT4j4VQFF0BqpZcLY=
-github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.9.20 h1:jlgyHbkZQAgAc7VIxJDmtouH8eNjOk2REVAQfVhdaiQ=
-github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.9.20/go.mod h1:Xs52xaLBqDEKRcAfX/hgjmD3YQ7c/W+BEyfamlO/W2E=
 github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.12.13 h1:SYVGSFQHlchIcy6e7x12bsrxClCXSP5et8cqVhL8cuw=
 github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.12.13/go.mod h1:kizuDaLX37bG5WZaoxGPQR/LNFXpxp0vsUnqfkWXfNE=
-github.com/aws/aws-sdk-go-v2/service/sso v1.11.26 h1:ActQgdTNQej/RuUJjB9uxYVLDOvRGtUreXF8L3c8wyg=
-github.com/aws/aws-sdk-go-v2/service/sso v1.11.26/go.mod h1:uB9tV79ULEZUXc6Ob18A46KSQ0JDlrplPni9XW6Ot60=
 github.com/aws/aws-sdk-go-v2/service/sso v1.24.15 h1:/eE3DogBjYlvlbhd2ssWyeuovWunHLxfgw3s/OJa4GQ=
 github.com/aws/aws-sdk-go-v2/service/sso v1.24.15/go.mod h1:2PCJYpi7EKeA5SkStAmZlF6fi0uUABuhtF8ILHjGc3Y=
-github.com/aws/aws-sdk-go-v2/service/ssooidc v1.13.9 h1:wihKuqYUlA2T/Rx+yu2s6NDAns8B9DgnRooB1PVhY+Q=
-github.com/aws/aws-sdk-go-v2/service/ssooidc v1.13.9/go.mod h1:2E/3D/mB8/r2J7nK42daoKP/ooCwbf0q1PznNc+DZTU=
 github.com/aws/aws-sdk-go-v2/service/ssooidc v1.28.14 h1:M/zwXiL2iXUrHputuXgmO94TVNmcenPHxgLXLutodKE=
 github.com/aws/aws-sdk-go-v2/service/ssooidc v1.28.14/go.mod h1:RVwIw3y/IqxC2YEXSIkAzRDdEU1iRabDPaYjpGCbCGQ=
-github.com/aws/aws-sdk-go-v2/service/sts v1.17.6 h1:VQFOLQVL3BrKM/NLO/7FiS4vcp5bqK0mGMyk09xLoAY=
-github.com/aws/aws-sdk-go-v2/service/sts v1.17.6/go.mod h1:Az3OXXYGyfNwQNsK/31L4R75qFYnO641RZGAoV3uH1c=
 github.com/aws/aws-sdk-go-v2/service/sts v1.33.14 h1:TzeR06UCMUq+KA3bDkujxK1GVGy+G8qQN/QVYzGLkQE=
 github.com/aws/aws-sdk-go-v2/service/sts v1.33.14/go.mod h1:dspXf/oYWGWo6DEvj98wpaTeqt5+DMidZD0A9BYTizc=
-github.com/aws/smithy-go v1.13.5 h1:hgz0X/DX0dGqTYpGALqXJoRKRj5oQ7150i5FdTePzO8=
-github.com/aws/smithy-go v1.13.5/go.mod h1:Tg+OJXh4MB2R/uN61Ko2f6hTZwB/ZYGOtib8J3gBHzA=
 github.com/aws/smithy-go v1.22.2 h1:6D9hW43xKFrRx/tXXfAlIZc4JI+yQe6snnWcQyxSyLQ=
 github.com/aws/smithy-go v1.22.2/go.mod h1:irrKGvNn1InZwb2d7fkIRNucdfwR8R+Ts3wxYa/cJHg=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
@@ -148,7 +124,6 @@ github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
 github.com/google/go-cmp v0.5.3/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.5.8/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
@@ -197,8 +172,6 @@ github.com/jcmturner/rpc/v2 v2.0.3 h1:7FXXj8Ti1IaVFpSAziCZWNzbNuZmnvw/i6CqLNdWfZ
 github.com/jcmturner/rpc/v2 v2.0.3/go.mod h1:VUJYCIDm3PVOEHw8sgt091/20OJjskO/YJki3ELg/Hc=
 github.com/jhump/protoreflect v1.15.1 h1:HUMERORf3I3ZdX05WaQ6MIpd/NJ434hTp5YiKgfCL6c=
 github.com/jhump/protoreflect v1.15.1/go.mod h1:jD/2GMKKE6OqX8qTjhADU1e6DShO+gavG9e0Q693nKo=
-github.com/jmespath/go-jmespath v0.4.0/go.mod h1:T8mJZnbsbmF+m6zOOFylbeCJqk5+pHWvzYPziyZiYoo=
-github.com/jmespath/go-jmespath/internal/testify v1.5.1/go.mod h1:L3OGu8Wl2/fWfCI6z80xFu9LTZmf1ZRjMHUOPmWr69U=
 github.com/jpillora/backoff v1.0.0/go.mod h1:J/6gKK9jxlEcS3zixgDgUAsiuZ7yrSoa/FX5e0EB2j4=
 github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
 github.com/json-iterator/go v1.1.10/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
@@ -471,7 +444,6 @@ gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

proxy/proxy.go

@@ -1,11 +1,13 @@
 package proxy
 
 import (
+	"bytes"
 	"crypto/tls"
 	"fmt"
 	"net"
 	"strconv"
 	"sync"
+	"text/template"
 
 	"github.com/grepplabs/kafka-proxy/config"
 	"github.com/grepplabs/kafka-proxy/pkg/libs/util"
@@ -190,17 +192,57 @@ func (p *Listeners) ListenDynamicInstance(brokerAddress string, brokerId int32)
 	port := l.Addr().(*net.TCPAddr).Port
 	address := net.JoinHostPort(p.defaultListenerIP, fmt.Sprint(port))
 
-	dynamicAdvertisedListener := p.dynamicAdvertisedListener
-	if dynamicAdvertisedListener == "" {
-		dynamicAdvertisedListener = p.defaultListenerIP
+	dynamicAdvertisedHost, dynamicAdvertisedPort, err := p.getDynamicAdvertisedAddress(cfg.BrokerID, port)
+	if err != nil {
+		return "", 0, err
 	}
-	cfg.AdvertisedAddress = net.JoinHostPort(dynamicAdvertisedListener, fmt.Sprint(port))
+	cfg.AdvertisedAddress = net.JoinHostPort(dynamicAdvertisedHost, fmt.Sprint(dynamicAdvertisedPort))
 	cfg.ListenerAddress = address
 
 	p.brokerToListenerConfig[brokerAddress] = cfg
 	logrus.Infof("Dynamic listener %s for broker %s brokerId %d advertised as %s", cfg.ListenerAddress, cfg.GetBrokerAddress(), cfg.BrokerID, cfg.AdvertisedAddress)
 
-	return dynamicAdvertisedListener, int32(port), nil
+	return dynamicAdvertisedHost, int32(dynamicAdvertisedPort), nil
+}
+
+func (p *Listeners) getDynamicAdvertisedAddress(brokerID int32, port int) (string, int, error) {
+	dynamicAdvertisedListener := p.dynamicAdvertisedListener
+	if dynamicAdvertisedListener == "" {
+		return p.defaultListenerIP, port, nil
+	}
+	dynamicAdvertisedListener, err := p.templateDynamicAdvertisedAddress(brokerID)
+	if err != nil {
+		return "", 0, err
+	}
+	var (
+		dynamicAdvertisedHost = dynamicAdvertisedListener
+		dynamicAdvertisedPort = port
+	)
+	advHost, advPortStr, err := net.SplitHostPort(dynamicAdvertisedListener)
+	if err == nil {
+		if advPort, err := strconv.Atoi(advPortStr); err == nil {
+			dynamicAdvertisedHost = advHost
+			dynamicAdvertisedPort = advPort
+		}
+	}
+	return dynamicAdvertisedHost, dynamicAdvertisedPort, nil
+}
+
+func (p *Listeners) templateDynamicAdvertisedAddress(brokerID int32) (string, error) {
+	tmpl, err := template.New("dynamicAdvertisedHost").Option("missingkey=error").Parse(p.dynamicAdvertisedListener)
+	if err != nil {
+		return "", fmt.Errorf("failed to parse host template '%s': %w", p.dynamicAdvertisedListener, err)
+	}
+	var buf bytes.Buffer
+	data := map[string]any{
+		"brokerId": brokerID,
+		"brokerID": brokerID,
+	}
+	err = tmpl.Execute(&buf, data)
+	if err != nil {
+		return "", fmt.Errorf("failed to execute host template '%s': %w", p.dynamicAdvertisedListener, err)
+	}
+	return buf.String(), nil
 }
 
 func (p *Listeners) ListenInstances(cfgs []config.ListenerConfig) (<-chan Conn, error) {