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fix unix line endings

This commit is contained in:
Henrik Hautakoski 2026-02-19 10:37:42 +01:00
parent b53e0bb9c7
commit c955b3ee3c
24 changed files with 1044 additions and 1044 deletions

4
.gitignore vendored
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@ -1,2 +1,2 @@
config.yml
build/
config.yml
build/

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@ -1,22 +1,22 @@
image: golang:1.23
stages:
- test
- build
unit-test:
stage: test
script:
- go test -v ./...
compile:
stage: build
script:
- mkdir -p build
- GOOS=linux GOARCH=amd64 go build -o build/dnsupdater-linux-amd64 cmd/dnsupdater/main.go
- GOOS=linux GOARCH=mips GOMIPS=softfloat go build -o build/dnsupdater-linux-mips cmd/dnsupdater/main.go
- GOOS=linux GOARCH=mipsle GOMIPS=softfloat go build -o build/dnsupdater-linux-mipsle cmd/dnsupdater/main.go
artifacts:
paths:
- build
image: golang:1.23
stages:
- test
- build
unit-test:
stage: test
script:
- go test -v ./...
compile:
stage: build
script:
- mkdir -p build
- GOOS=linux GOARCH=amd64 go build -o build/dnsupdater-linux-amd64 cmd/dnsupdater/main.go
- GOOS=linux GOARCH=mips GOMIPS=softfloat go build -o build/dnsupdater-linux-mips cmd/dnsupdater/main.go
- GOOS=linux GOARCH=mipsle GOMIPS=softfloat go build -o build/dnsupdater-linux-mipsle cmd/dnsupdater/main.go
artifacts:
paths:
- build

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@ -1,12 +1,12 @@
GO=go
VERSION=$(shell git describe --always --tags --dirty --match="v*")
GOLDFLAGS=-v -s -w -X main.version="$(VERSION)"
GOBUILDFLAGS=-v -p $(shell nproc) -ldflags="$(GOLDFLAGS)"
.PHONY: build test
build :
$(GO) build $(GOBUILDFLAGS) -o build/dnsupdater cmd/dnsupdater/main.go
test :
$(GO) test -v ./...
GO=go
VERSION=$(shell git describe --always --tags --dirty --match="v*")
GOLDFLAGS=-v -s -w -X main.version="$(VERSION)"
GOBUILDFLAGS=-v -p $(shell nproc) -ldflags="$(GOLDFLAGS)"
.PHONY: build test
build :
$(GO) build $(GOBUILDFLAGS) -o build/dnsupdater cmd/dnsupdater/main.go
test :
$(GO) test -v ./...

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@ -1,59 +1,59 @@
package app
import (
"context"
"fmt"
"net"
"time"
dnsservice "dnsupdater/dns/service"
"dnsupdater/ip"
"dnsupdater/ip/resolver"
)
// WAN_IFACE Name for the virtual WAN interface
const WAN_IFACE = "wan"
type App struct {
cache *ip.Cache
cacheDefaultCallback ip.CacheDefaultCallback
// DNS service manager
DnsServiceMgr *dnsservice.Manager
}
func makeCacheCallback(service resolver.Service) ip.CacheDefaultCallback {
return func(name string) (net.IP, error) {
if name == WAN_IFACE {
ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
defer cancel()
return service.Lookup(ctx)
}
return ip.GetInterfaceIP(name)
}
}
func NewApp(config *Config) (*App, error) {
dnsServiceMgr := dnsservice.NewManager()
err := dnsServiceMgr.RegisterFromConfig(config.Providers)
if err != nil {
return nil, err
}
ipService := resolver.Get(config.Services.IPLookup)
if ipService == nil {
return nil, fmt.Errorf("failed to load lookup service: %s", config.Services.IPLookup)
}
return &App{
DnsServiceMgr: dnsServiceMgr,
cache: ip.NewCache(),
cacheDefaultCallback: makeCacheCallback(ipService),
}, nil
}
func (a App) GetIP(iface_name string) (net.IP, error) {
return a.cache.GetWithDefault(iface_name, a.cacheDefaultCallback)
}
package app
import (
"context"
"fmt"
"net"
"time"
dnsservice "dnsupdater/dns/service"
"dnsupdater/ip"
"dnsupdater/ip/resolver"
)
// WAN_IFACE Name for the virtual WAN interface
const WAN_IFACE = "wan"
type App struct {
cache *ip.Cache
cacheDefaultCallback ip.CacheDefaultCallback
// DNS service manager
DnsServiceMgr *dnsservice.Manager
}
func makeCacheCallback(service resolver.Service) ip.CacheDefaultCallback {
return func(name string) (net.IP, error) {
if name == WAN_IFACE {
ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
defer cancel()
return service.Lookup(ctx)
}
return ip.GetInterfaceIP(name)
}
}
func NewApp(config *Config) (*App, error) {
dnsServiceMgr := dnsservice.NewManager()
err := dnsServiceMgr.RegisterFromConfig(config.Providers)
if err != nil {
return nil, err
}
ipService := resolver.Get(config.Services.IPLookup)
if ipService == nil {
return nil, fmt.Errorf("failed to load lookup service: %s", config.Services.IPLookup)
}
return &App{
DnsServiceMgr: dnsServiceMgr,
cache: ip.NewCache(),
cacheDefaultCallback: makeCacheCallback(ipService),
}, nil
}
func (a App) GetIP(iface_name string) (net.IP, error) {
return a.cache.GetWithDefault(iface_name, a.cacheDefaultCallback)
}

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@ -1,46 +1,46 @@
package app
import (
"os"
"gopkg.in/yaml.v3"
)
type (
DomainRecords map[string]string
Domain map[string]DomainRecords
)
type DigitalOceanService struct {
Token string `yaml:"token"`
Domains map[string]DomainRecords `yaml:"domains"`
}
type Providers struct {
Token string `yaml:"token"`
Domains map[string]DomainRecords `yaml:"domains"`
}
type Services struct {
IPLookup string `yaml:"IPLookup"`
}
type Config struct {
Services Services `yaml:"services"`
Providers map[string]map[string]any
Updates map[string]Domain
}
func LoadConfig(filename string) (*Config, error) {
cfg := Config{
Services: Services{
IPLookup: "ipecho",
},
}
data, err := os.ReadFile(filename)
if err == nil {
err = yaml.Unmarshal(data, &cfg)
}
return &cfg, err
}
package app
import (
"os"
"gopkg.in/yaml.v3"
)
type (
DomainRecords map[string]string
Domain map[string]DomainRecords
)
type DigitalOceanService struct {
Token string `yaml:"token"`
Domains map[string]DomainRecords `yaml:"domains"`
}
type Providers struct {
Token string `yaml:"token"`
Domains map[string]DomainRecords `yaml:"domains"`
}
type Services struct {
IPLookup string `yaml:"IPLookup"`
}
type Config struct {
Services Services `yaml:"services"`
Providers map[string]map[string]any
Updates map[string]Domain
}
func LoadConfig(filename string) (*Config, error) {
cfg := Config{
Services: Services{
IPLookup: "ipecho",
},
}
data, err := os.ReadFile(filename)
if err == nil {
err = yaml.Unmarshal(data, &cfg)
}
return &cfg, err
}

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@ -1,84 +1,84 @@
package main
import (
"flag"
"fmt"
"os"
"time"
App "dnsupdater/app"
"github.com/rs/zerolog"
"github.com/rs/zerolog/log"
)
var version string = "(unknown)"
func main() {
configFile := flag.String("config", "./config.yml", "configuration file")
versionFlag := flag.Bool("v", false, "Prints the version")
flag.Parse()
if *versionFlag {
fmt.Println(version)
os.Exit(0)
}
log.Logger = log.Output(zerolog.ConsoleWriter{
Out: os.Stderr,
TimeFormat: time.RFC3339,
})
config, err := App.LoadConfig(*configFile)
if err != nil {
log.Fatal().Err(err).Str("file", *configFile).Msg("Failed to load config")
}
app, err := App.NewApp(config)
if err != nil {
log.Fatal().Err(err).Msg("Failed to initialize application")
}
for service_name, domains := range config.Updates {
// Get DNS Service
dnsService := app.DnsServiceMgr.Get(service_name)
if dnsService == nil {
log.Warn().Str("service", service_name).Msg("Invalid DNS service")
continue
}
log.Info().Str("service", service_name).Msg("Begin update for service")
updater := App.NewUpdater(dnsService)
for domain, records := range domains {
for name, data := range records {
logger := log.With().
Str("service", service_name).
Str("domain", domain).
Str("record", name).
Str("interface", data).
Logger()
ip, err := app.GetIP(data)
if err != nil {
logger.Error().Err(err).Msg("Failed to fetch ip")
continue
}
logger = logger.With().IPAddr("ip", ip).Logger()
err = updater.Update(domain, name, ip)
if err != nil {
logger.Error().Err(err).Msg("Failed to update record")
} else {
logger.Info().Msg("Record updated")
}
}
}
}
}
package main
import (
"flag"
"fmt"
"os"
"time"
App "dnsupdater/app"
"github.com/rs/zerolog"
"github.com/rs/zerolog/log"
)
var version string = "(unknown)"
func main() {
configFile := flag.String("config", "./config.yml", "configuration file")
versionFlag := flag.Bool("v", false, "Prints the version")
flag.Parse()
if *versionFlag {
fmt.Println(version)
os.Exit(0)
}
log.Logger = log.Output(zerolog.ConsoleWriter{
Out: os.Stderr,
TimeFormat: time.RFC3339,
})
config, err := App.LoadConfig(*configFile)
if err != nil {
log.Fatal().Err(err).Str("file", *configFile).Msg("Failed to load config")
}
app, err := App.NewApp(config)
if err != nil {
log.Fatal().Err(err).Msg("Failed to initialize application")
}
for service_name, domains := range config.Updates {
// Get DNS Service
dnsService := app.DnsServiceMgr.Get(service_name)
if dnsService == nil {
log.Warn().Str("service", service_name).Msg("Invalid DNS service")
continue
}
log.Info().Str("service", service_name).Msg("Begin update for service")
updater := App.NewUpdater(dnsService)
for domain, records := range domains {
for name, data := range records {
logger := log.With().
Str("service", service_name).
Str("domain", domain).
Str("record", name).
Str("interface", data).
Logger()
ip, err := app.GetIP(data)
if err != nil {
logger.Error().Err(err).Msg("Failed to fetch ip")
continue
}
logger = logger.With().IPAddr("ip", ip).Logger()
err = updater.Update(domain, name, ip)
if err != nil {
logger.Error().Err(err).Msg("Failed to update record")
} else {
logger.Info().Msg("Record updated")
}
}
}
}
}

View file

@ -1,26 +1,26 @@
services:
IPLookup: ipecho
providers:
digitalocean:
token: xxxx
vultr:
token: xxxx
updates:
digitalocean:
domain1.com:
www: wan
box: 10.140.14.2
domain2.com:
www: wan
mail: wan
static: 84.24.254.21
vultr:
example1.com:
www: wan
example2.com:
www: wan
ftp: 88.212.99.90
services:
IPLookup: ipecho
providers:
digitalocean:
token: xxxx
vultr:
token: xxxx
updates:
digitalocean:
domain1.com:
www: wan
box: 10.140.14.2
domain2.com:
www: wan
mail: wan
static: 84.24.254.21
vultr:
example1.com:
www: wan
example2.com:
www: wan
ftp: 88.212.99.90

View file

@ -1,109 +1,109 @@
package digitalocean
import (
"context"
"errors"
"testing"
"github.com/digitalocean/godo"
"github.com/stretchr/testify/assert"
)
type mock struct {
t *testing.T
records_by_type map[string][]godo.DomainRecord
edit_record_request *godo.DomainRecordEditRequest
edit_record_error error
}
func (m mock) List(context.Context, *godo.ListOptions) ([]godo.Domain, *godo.Response, error) {
m.t.Error("List called when it should not have been")
return nil, nil, nil
}
func (m mock) Get(context.Context, string) (*godo.Domain, *godo.Response, error) {
m.t.Error("Get called when it should not have been")
return nil, nil, nil
}
func (m mock) Create(context.Context, *godo.DomainCreateRequest) (*godo.Domain, *godo.Response, error) {
m.t.Error("Create called when it should not have been")
return nil, nil, nil
}
func (m mock) Delete(context.Context, string) (*godo.Response, error) {
m.t.Error("Delete called when it should not have been")
return nil, nil
}
func (m mock) Records(context.Context, string, *godo.ListOptions) ([]godo.DomainRecord, *godo.Response, error) {
m.t.Error("Records called when it should not have been")
return nil, nil, nil
}
func (m mock) RecordsByType(_ context.Context, name string, t string, opt *godo.ListOptions) ([]godo.DomainRecord, *godo.Response, error) {
var err error
// Only care about "A" records
assert.Equal(m.t, "A", t)
r, ok := m.records_by_type[name]
if !ok {
err = errors.New("Record not found")
}
return r, nil, err
}
func (m mock) RecordsByName(context.Context, string, string, *godo.ListOptions) ([]godo.DomainRecord, *godo.Response, error) {
m.t.Error("RecordsByName called when it should not have been")
return nil, nil, nil
}
func (m mock) RecordsByTypeAndName(context.Context, string, string, string, *godo.ListOptions) ([]godo.DomainRecord, *godo.Response, error) {
m.t.Error("RecordsByTypeAndName called when it should not have been")
return nil, nil, nil
}
func (m mock) Record(context.Context, string, int) (*godo.DomainRecord, *godo.Response, error) {
m.t.Error("Record called when it should not have been")
return nil, nil, nil
}
func (m mock) DeleteRecord(context.Context, string, int) (*godo.Response, error) {
m.t.Error("DeleteRecord called when it should not have been")
return nil, nil
}
func (m mock) EditRecord(_ context.Context, domain string, id int, req *godo.DomainRecordEditRequest) (*godo.DomainRecord, *godo.Response, error) {
if m.edit_record_request == nil {
m.t.Error("EditRecord called with empty request")
}
if m.edit_record_error != nil {
return nil, nil, m.edit_record_error
}
assert.Equal(m.t, m.edit_record_request, req)
record := godo.DomainRecord{
ID: id,
Type: req.Type,
Name: req.Name,
Data: req.Data,
Priority: req.Priority,
Port: req.Port,
TTL: req.TTL,
Weight: req.Weight,
Flags: req.Flags,
Tag: req.Tag,
}
return &record, nil, nil
}
func (m mock) CreateRecord(context.Context, string, *godo.DomainRecordEditRequest) (*godo.DomainRecord, *godo.Response, error) {
m.t.Error("CreateRecord called when it should not have been")
return nil, nil, nil
}
package digitalocean
import (
"context"
"errors"
"testing"
"github.com/digitalocean/godo"
"github.com/stretchr/testify/assert"
)
type mock struct {
t *testing.T
records_by_type map[string][]godo.DomainRecord
edit_record_request *godo.DomainRecordEditRequest
edit_record_error error
}
func (m mock) List(context.Context, *godo.ListOptions) ([]godo.Domain, *godo.Response, error) {
m.t.Error("List called when it should not have been")
return nil, nil, nil
}
func (m mock) Get(context.Context, string) (*godo.Domain, *godo.Response, error) {
m.t.Error("Get called when it should not have been")
return nil, nil, nil
}
func (m mock) Create(context.Context, *godo.DomainCreateRequest) (*godo.Domain, *godo.Response, error) {
m.t.Error("Create called when it should not have been")
return nil, nil, nil
}
func (m mock) Delete(context.Context, string) (*godo.Response, error) {
m.t.Error("Delete called when it should not have been")
return nil, nil
}
func (m mock) Records(context.Context, string, *godo.ListOptions) ([]godo.DomainRecord, *godo.Response, error) {
m.t.Error("Records called when it should not have been")
return nil, nil, nil
}
func (m mock) RecordsByType(_ context.Context, name string, t string, opt *godo.ListOptions) ([]godo.DomainRecord, *godo.Response, error) {
var err error
// Only care about "A" records
assert.Equal(m.t, "A", t)
r, ok := m.records_by_type[name]
if !ok {
err = errors.New("Record not found")
}
return r, nil, err
}
func (m mock) RecordsByName(context.Context, string, string, *godo.ListOptions) ([]godo.DomainRecord, *godo.Response, error) {
m.t.Error("RecordsByName called when it should not have been")
return nil, nil, nil
}
func (m mock) RecordsByTypeAndName(context.Context, string, string, string, *godo.ListOptions) ([]godo.DomainRecord, *godo.Response, error) {
m.t.Error("RecordsByTypeAndName called when it should not have been")
return nil, nil, nil
}
func (m mock) Record(context.Context, string, int) (*godo.DomainRecord, *godo.Response, error) {
m.t.Error("Record called when it should not have been")
return nil, nil, nil
}
func (m mock) DeleteRecord(context.Context, string, int) (*godo.Response, error) {
m.t.Error("DeleteRecord called when it should not have been")
return nil, nil
}
func (m mock) EditRecord(_ context.Context, domain string, id int, req *godo.DomainRecordEditRequest) (*godo.DomainRecord, *godo.Response, error) {
if m.edit_record_request == nil {
m.t.Error("EditRecord called with empty request")
}
if m.edit_record_error != nil {
return nil, nil, m.edit_record_error
}
assert.Equal(m.t, m.edit_record_request, req)
record := godo.DomainRecord{
ID: id,
Type: req.Type,
Name: req.Name,
Data: req.Data,
Priority: req.Priority,
Port: req.Port,
TTL: req.TTL,
Weight: req.Weight,
Flags: req.Flags,
Tag: req.Tag,
}
return &record, nil, nil
}
func (m mock) CreateRecord(context.Context, string, *godo.DomainRecordEditRequest) (*godo.DomainRecord, *godo.Response, error) {
m.t.Error("CreateRecord called when it should not have been")
return nil, nil, nil
}

View file

@ -1,67 +1,67 @@
package digitalocean
import (
"context"
"errors"
"net"
"strconv"
"dnsupdater/dns"
"github.com/digitalocean/godo"
)
type Service struct {
api godo.DomainsService
}
func New(token string) Service {
return Service{
api: godo.NewFromToken(token).Domains,
}
}
func Factory(args map[string]any) (any, error) {
t, ok := args["token"]
if !ok {
return nil, errors.New("did not find token")
}
token, ok := t.(string)
if !ok {
return nil, errors.New("token must be a string")
}
return New(token), nil
}
func (d Service) List(domain_name string) (dns.RecordList, error) {
fetchedRecords, _, err := d.api.RecordsByType(context.Background(), domain_name, "A", &godo.ListOptions{
PerPage: 50,
})
if err != nil {
return nil, err
}
records := dns.RecordList{}
for _, rec := range fetchedRecords {
records.Add(dns.Record{
Id: strconv.Itoa(rec.ID),
Name: rec.Name,
Ip: net.ParseIP(rec.Data),
})
}
return records, nil
}
func (d Service) Update(domain, recordID, ip string) error {
id, err := strconv.Atoi(recordID)
if err != nil {
return err
}
_, _, err = d.api.EditRecord(context.Background(), domain, id, &godo.DomainRecordEditRequest{
Data: ip,
})
return err
}
package digitalocean
import (
"context"
"errors"
"net"
"strconv"
"dnsupdater/dns"
"github.com/digitalocean/godo"
)
type Service struct {
api godo.DomainsService
}
func New(token string) Service {
return Service{
api: godo.NewFromToken(token).Domains,
}
}
func Factory(args map[string]any) (any, error) {
t, ok := args["token"]
if !ok {
return nil, errors.New("did not find token")
}
token, ok := t.(string)
if !ok {
return nil, errors.New("token must be a string")
}
return New(token), nil
}
func (d Service) List(domain_name string) (dns.RecordList, error) {
fetchedRecords, _, err := d.api.RecordsByType(context.Background(), domain_name, "A", &godo.ListOptions{
PerPage: 50,
})
if err != nil {
return nil, err
}
records := dns.RecordList{}
for _, rec := range fetchedRecords {
records.Add(dns.Record{
Id: strconv.Itoa(rec.ID),
Name: rec.Name,
Ip: net.ParseIP(rec.Data),
})
}
return records, nil
}
func (d Service) Update(domain, recordID, ip string) error {
id, err := strconv.Atoi(recordID)
if err != nil {
return err
}
_, _, err = d.api.EditRecord(context.Background(), domain, id, &godo.DomainRecordEditRequest{
Data: ip,
})
return err
}

View file

@ -1,49 +1,49 @@
package service
import (
"fmt"
"dnsupdater/dns/service/digitalocean"
"dnsupdater/dns/service/vultr"
)
var factories = map[string]Factory{
"digitalocean": digitalocean.Factory,
"vultr": vultr.Factory,
}
type Manager struct {
services map[string]Service
}
func NewManager() *Manager {
return &Manager{
services: make(map[string]Service),
}
}
func (m Manager) Get(name string) Service {
if service, ok := m.services[name]; ok {
return service
}
return nil
}
func (m Manager) RegisterFromConfig(providers map[string]map[string]any) error {
for name, args := range providers {
if factory, ok := factories[name]; ok {
provider, err := factory(args)
if err != nil {
return fmt.Errorf("could not create provider '%s': %v", name, err)
}
m.Register(name, provider.(Service))
}
}
return nil
}
func (m Manager) Register(name string, provider Service) {
m.services[name] = provider
}
package service
import (
"fmt"
"dnsupdater/dns/service/digitalocean"
"dnsupdater/dns/service/vultr"
)
var factories = map[string]Factory{
"digitalocean": digitalocean.Factory,
"vultr": vultr.Factory,
}
type Manager struct {
services map[string]Service
}
func NewManager() *Manager {
return &Manager{
services: make(map[string]Service),
}
}
func (m Manager) Get(name string) Service {
if service, ok := m.services[name]; ok {
return service
}
return nil
}
func (m Manager) RegisterFromConfig(providers map[string]map[string]any) error {
for name, args := range providers {
if factory, ok := factories[name]; ok {
provider, err := factory(args)
if err != nil {
return fmt.Errorf("could not create provider '%s': %v", name, err)
}
m.Register(name, provider.(Service))
}
}
return nil
}
func (m Manager) Register(name string, provider Service) {
m.services[name] = provider
}

View file

@ -1,10 +1,10 @@
package service
import "dnsupdater/dns"
type Service interface {
List(domain string) (dns.RecordList, error)
Update(domain, recordID, ip string) error
}
type Factory func(map[string]any) (any, error)
package service
import "dnsupdater/dns"
type Service interface {
List(domain string) (dns.RecordList, error)
Update(domain, recordID, ip string) error
}
type Factory func(map[string]any) (any, error)

View file

@ -1,27 +1,27 @@
package http
import (
"context"
"fmt"
"net/http"
)
// Perform a HTTP Get request.
func Get(ctx context.Context, url string, headers http.Header) (*http.Response, error) {
req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
if err != nil {
return nil, err
}
req.Header = headers
resp, err := http.DefaultClient.Do(req)
if err != nil {
return nil, err
}
if resp.StatusCode >= 400 {
return nil, fmt.Errorf("HTTP Response: %s", resp.Status)
}
return resp, nil
}
package http
import (
"context"
"fmt"
"net/http"
)
// Perform a HTTP Get request.
func Get(ctx context.Context, url string, headers http.Header) (*http.Response, error) {
req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
if err != nil {
return nil, err
}
req.Header = headers
resp, err := http.DefaultClient.Do(req)
if err != nil {
return nil, err
}
if resp.StatusCode >= 400 {
return nil, fmt.Errorf("HTTP Response: %s", resp.Status)
}
return resp, nil
}

View file

@ -1,43 +1,43 @@
package ip
import (
"errors"
"net"
)
type CacheDefaultCallback func(name string) (net.IP, error)
type Cache struct {
items map[string]net.IP
}
func NewCache() *Cache {
return &Cache{
items: make(map[string]net.IP),
}
}
func (c Cache) Get(name string) (net.IP, error) {
// Return cached entry.
if cached, ok := c.items[name]; ok {
return cached, nil
}
return nil, errors.New("key did not exist")
}
func (c Cache) GetWithDefault(name string, callback CacheDefaultCallback) (net.IP, error) {
// Return cached entry.
if cached, ok := c.items[name]; ok {
return cached, nil
}
ip, err := callback(name)
if err == nil {
c.Set(name, ip)
}
return ip, err
}
func (c *Cache) Set(name string, ip net.IP) {
c.items[name] = ip
}
package ip
import (
"errors"
"net"
)
type CacheDefaultCallback func(name string) (net.IP, error)
type Cache struct {
items map[string]net.IP
}
func NewCache() *Cache {
return &Cache{
items: make(map[string]net.IP),
}
}
func (c Cache) Get(name string) (net.IP, error) {
// Return cached entry.
if cached, ok := c.items[name]; ok {
return cached, nil
}
return nil, errors.New("key did not exist")
}
func (c Cache) GetWithDefault(name string, callback CacheDefaultCallback) (net.IP, error) {
// Return cached entry.
if cached, ok := c.items[name]; ok {
return cached, nil
}
ip, err := callback(name)
if err == nil {
c.Set(name, ip)
}
return ip, err
}
func (c *Cache) Set(name string, ip net.IP) {
c.items[name] = ip
}

View file

@ -1,76 +1,76 @@
package ip
import (
"errors"
"net"
"reflect"
"testing"
"github.com/stretchr/testify/assert"
)
func defaultCallback(t *testing.T, expected_name string, ip net.IP, err error) CacheDefaultCallback {
return func(name string) (net.IP, error) {
assert.Equal(t, expected_name, name)
return ip, err
}
}
func dontCallDefaultCallback(t *testing.T) CacheDefaultCallback {
return func(name string) (net.IP, error) {
t.Error("Should not have been called")
return nil, nil
}
}
func TestCache_Get(t *testing.T) {
tests := []struct {
name string
c *Cache
iface string
want net.IP
wantErr bool
}{
{"Exists in cache", &Cache{items: map[string]net.IP{"eth0": net.IPv4(10, 4, 0, 1)}}, "eth0", net.IPv4(10, 4, 0, 1), false},
{"Did not exist in cache", &Cache{items: map[string]net.IP{}}, "eth0", nil, true},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got, err := tt.c.Get(tt.iface)
if (err != nil) != tt.wantErr {
t.Errorf("Cache.Get() error = %v, wantErr %v", err, tt.wantErr)
return
}
if !reflect.DeepEqual(got, tt.want) {
t.Errorf("Cache.Get() = %v, want %v", got, tt.want)
}
})
}
}
func TestCache_GetWithDefault(t *testing.T) {
tests := []struct {
name string
c *Cache
def CacheDefaultCallback
iface string
want net.IP
wantErr bool
}{
{"Exists in cache", &Cache{items: map[string]net.IP{"eth0": net.IPv4(10, 4, 0, 1)}}, dontCallDefaultCallback(t), "eth0", net.IPv4(10, 4, 0, 1), false},
{"Did not exists in cache", NewCache(), defaultCallback(t, "eth1", net.IPv4(192, 172, 44, 25), nil), "eth1", net.IPv4(192, 172, 44, 25), false},
{"Callback returns error", NewCache(), defaultCallback(t, "eth1", nil, errors.New("some error")), "eth1", nil, true},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got, err := tt.c.GetWithDefault(tt.iface, tt.def)
if (err != nil) != tt.wantErr {
t.Errorf("Cache.Get() error = %v, wantErr %v", err, tt.wantErr)
return
}
if !reflect.DeepEqual(got, tt.want) {
t.Errorf("Cache.Get() = %v, want %v", got, tt.want)
}
})
}
}
package ip
import (
"errors"
"net"
"reflect"
"testing"
"github.com/stretchr/testify/assert"
)
func defaultCallback(t *testing.T, expected_name string, ip net.IP, err error) CacheDefaultCallback {
return func(name string) (net.IP, error) {
assert.Equal(t, expected_name, name)
return ip, err
}
}
func dontCallDefaultCallback(t *testing.T) CacheDefaultCallback {
return func(name string) (net.IP, error) {
t.Error("Should not have been called")
return nil, nil
}
}
func TestCache_Get(t *testing.T) {
tests := []struct {
name string
c *Cache
iface string
want net.IP
wantErr bool
}{
{"Exists in cache", &Cache{items: map[string]net.IP{"eth0": net.IPv4(10, 4, 0, 1)}}, "eth0", net.IPv4(10, 4, 0, 1), false},
{"Did not exist in cache", &Cache{items: map[string]net.IP{}}, "eth0", nil, true},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got, err := tt.c.Get(tt.iface)
if (err != nil) != tt.wantErr {
t.Errorf("Cache.Get() error = %v, wantErr %v", err, tt.wantErr)
return
}
if !reflect.DeepEqual(got, tt.want) {
t.Errorf("Cache.Get() = %v, want %v", got, tt.want)
}
})
}
}
func TestCache_GetWithDefault(t *testing.T) {
tests := []struct {
name string
c *Cache
def CacheDefaultCallback
iface string
want net.IP
wantErr bool
}{
{"Exists in cache", &Cache{items: map[string]net.IP{"eth0": net.IPv4(10, 4, 0, 1)}}, dontCallDefaultCallback(t), "eth0", net.IPv4(10, 4, 0, 1), false},
{"Did not exists in cache", NewCache(), defaultCallback(t, "eth1", net.IPv4(192, 172, 44, 25), nil), "eth1", net.IPv4(192, 172, 44, 25), false},
{"Callback returns error", NewCache(), defaultCallback(t, "eth1", nil, errors.New("some error")), "eth1", nil, true},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got, err := tt.c.GetWithDefault(tt.iface, tt.def)
if (err != nil) != tt.wantErr {
t.Errorf("Cache.Get() error = %v, wantErr %v", err, tt.wantErr)
return
}
if !reflect.DeepEqual(got, tt.want) {
t.Errorf("Cache.Get() = %v, want %v", got, tt.want)
}
})
}
}

View file

@ -1,46 +1,46 @@
package ip
import (
"errors"
"net"
)
func GetInterfaceIP(iface_name string) (net.IP, error) {
ip := net.IP{}
iface, err := net.InterfaceByName(iface_name)
if err != nil {
return ip, err
}
addrs, err := iface.Addrs()
if err != nil {
return ip, err
}
return GetPublicIp(addrs)
}
func GetPublicIp(list []net.Addr) (net.IP, error) {
for _, addr := range list {
ip, err := AddrToIP(addr)
if err == nil && !ip.IsPrivate() {
return ip, nil
}
}
return nil, errors.New("no public ip found on interface")
}
func AddrToIP(addr net.Addr) (net.IP, error) {
switch v := addr.(type) {
case *net.IPNet:
return v.IP, nil
case *net.IPAddr:
return v.IP, nil
case *net.UDPAddr:
return v.IP, nil
case *net.TCPAddr:
return v.IP, nil
}
return nil, errors.New("could not find ip")
}
package ip
import (
"errors"
"net"
)
func GetInterfaceIP(iface_name string) (net.IP, error) {
ip := net.IP{}
iface, err := net.InterfaceByName(iface_name)
if err != nil {
return ip, err
}
addrs, err := iface.Addrs()
if err != nil {
return ip, err
}
return GetPublicIp(addrs)
}
func GetPublicIp(list []net.Addr) (net.IP, error) {
for _, addr := range list {
ip, err := AddrToIP(addr)
if err == nil && !ip.IsPrivate() {
return ip, nil
}
}
return nil, errors.New("no public ip found on interface")
}
func AddrToIP(addr net.Addr) (net.IP, error) {
switch v := addr.(type) {
case *net.IPNet:
return v.IP, nil
case *net.IPAddr:
return v.IP, nil
case *net.UDPAddr:
return v.IP, nil
case *net.TCPAddr:
return v.IP, nil
}
return nil, errors.New("could not find ip")
}

View file

@ -1,69 +1,69 @@
package ip
import (
"net"
"reflect"
"testing"
)
func TestGetPublicIp(t *testing.T) {
tests := []struct {
name string
list []string
want string
wantErr bool
}{
{"empty", []string{}, "", true},
{"find", []string{"99.140.96.132"}, "99.140.96.132", false},
{"findfirst", []string{"23.114.115.197", "251.78.128.148"}, "23.114.115.197", false},
{"dontfindprivate", []string{"192.168.0.22", "88.12.32.44"}, "88.12.32.44", false},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
list := []net.Addr{}
for _, item := range tt.list {
list = append(list, &net.IPAddr{IP: net.ParseIP(item)})
}
want := net.ParseIP(tt.want)
got, err := GetPublicIp(list)
if (err != nil) != tt.wantErr {
t.Errorf("GetPublicIp() error = %v, wantErr %v", err, tt.wantErr)
return
}
if !reflect.DeepEqual(got, want) {
t.Errorf("GetPublicIp() = %v, want %v", got, want)
}
})
}
}
func TestAddrToIP(t *testing.T) {
tests := []struct {
name string
addr net.Addr
want net.IP
wantErr bool
}{
{"IPNet", &net.IPNet{IP: net.IPv4(177, 171, 44, 1)}, net.IPv4(177, 171, 44, 1), false},
{"IPAddr", &net.IPAddr{IP: net.IPv4(240, 23, 119, 171)}, net.IPv4(240, 23, 119, 171), false},
{"TCPAddr", &net.TCPAddr{IP: net.IPv4(139, 231, 35, 221)}, net.IPv4(139, 231, 35, 221), false},
{"UDPAddr", &net.UDPAddr{IP: net.IPv4(167, 147, 140, 119)}, net.IPv4(167, 147, 140, 119), false},
{"UnixAddr", &net.UnixAddr{}, nil, true},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got, err := AddrToIP(tt.addr)
if (err != nil) != tt.wantErr {
t.Errorf("AddrToIP() error = %v, wantErr %v", err, tt.wantErr)
return
}
if !reflect.DeepEqual(got, tt.want) {
t.Errorf("AddrToIP() = %v, want %v", got, tt.want)
}
})
}
}
package ip
import (
"net"
"reflect"
"testing"
)
func TestGetPublicIp(t *testing.T) {
tests := []struct {
name string
list []string
want string
wantErr bool
}{
{"empty", []string{}, "", true},
{"find", []string{"99.140.96.132"}, "99.140.96.132", false},
{"findfirst", []string{"23.114.115.197", "251.78.128.148"}, "23.114.115.197", false},
{"dontfindprivate", []string{"192.168.0.22", "88.12.32.44"}, "88.12.32.44", false},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
list := []net.Addr{}
for _, item := range tt.list {
list = append(list, &net.IPAddr{IP: net.ParseIP(item)})
}
want := net.ParseIP(tt.want)
got, err := GetPublicIp(list)
if (err != nil) != tt.wantErr {
t.Errorf("GetPublicIp() error = %v, wantErr %v", err, tt.wantErr)
return
}
if !reflect.DeepEqual(got, want) {
t.Errorf("GetPublicIp() = %v, want %v", got, want)
}
})
}
}
func TestAddrToIP(t *testing.T) {
tests := []struct {
name string
addr net.Addr
want net.IP
wantErr bool
}{
{"IPNet", &net.IPNet{IP: net.IPv4(177, 171, 44, 1)}, net.IPv4(177, 171, 44, 1), false},
{"IPAddr", &net.IPAddr{IP: net.IPv4(240, 23, 119, 171)}, net.IPv4(240, 23, 119, 171), false},
{"TCPAddr", &net.TCPAddr{IP: net.IPv4(139, 231, 35, 221)}, net.IPv4(139, 231, 35, 221), false},
{"UDPAddr", &net.UDPAddr{IP: net.IPv4(167, 147, 140, 119)}, net.IPv4(167, 147, 140, 119), false},
{"UnixAddr", &net.UnixAddr{}, nil, true},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got, err := AddrToIP(tt.addr)
if (err != nil) != tt.wantErr {
t.Errorf("AddrToIP() error = %v, wantErr %v", err, tt.wantErr)
return
}
if !reflect.DeepEqual(got, tt.want) {
t.Errorf("AddrToIP() = %v, want %v", got, tt.want)
}
})
}
}

View file

@ -1,15 +1,15 @@
package internal
import "net"
func ParseIP(s string) (net.IP, error) {
var err error = nil
ip := net.ParseIP(s)
if ip == nil {
err = &net.ParseError{
Type: "IP address",
Text: s,
}
}
return ip, err
}
package internal
import "net"
func ParseIP(s string) (net.IP, error) {
var err error = nil
ip := net.ParseIP(s)
if ip == nil {
err = &net.ParseError{
Type: "IP address",
Text: s,
}
}
return ip, err
}

View file

@ -1,35 +1,35 @@
package internal
import (
"net"
"reflect"
"testing"
)
func TestParseIP(t *testing.T) {
tests := []struct {
name string
input string
want net.IP
wantErr bool
}{
{"localhost", "127.0.0.1", net.IPv4(127, 0, 0, 1), false},
{"Private#1", "10.4.0.11", net.IPv4(10, 4, 0, 11), false},
{"Private#2", "192.168.1.12", net.IPv4(192, 168, 1, 12), false},
{"Public#1", "82.249.10.254", net.IPv4(82, 249, 10, 254), false},
{"Public#2", "57.167.50.222", net.IPv4(57, 167, 50, 222), false},
{"Invalid", "xx", nil, true},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got, err := ParseIP(tt.input)
if (err != nil) != tt.wantErr {
t.Errorf("ParseIP() error = %v, wantErr %v", err, tt.wantErr)
return
}
if !reflect.DeepEqual(got, tt.want) {
t.Errorf("ParseIP() = %v, want %v", got, tt.want)
}
})
}
}
package internal
import (
"net"
"reflect"
"testing"
)
func TestParseIP(t *testing.T) {
tests := []struct {
name string
input string
want net.IP
wantErr bool
}{
{"localhost", "127.0.0.1", net.IPv4(127, 0, 0, 1), false},
{"Private#1", "10.4.0.11", net.IPv4(10, 4, 0, 11), false},
{"Private#2", "192.168.1.12", net.IPv4(192, 168, 1, 12), false},
{"Public#1", "82.249.10.254", net.IPv4(82, 249, 10, 254), false},
{"Public#2", "57.167.50.222", net.IPv4(57, 167, 50, 222), false},
{"Invalid", "xx", nil, true},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got, err := ParseIP(tt.input)
if (err != nil) != tt.wantErr {
t.Errorf("ParseIP() error = %v, wantErr %v", err, tt.wantErr)
return
}
if !reflect.DeepEqual(got, tt.want) {
t.Errorf("ParseIP() = %v, want %v", got, tt.want)
}
})
}
}

View file

@ -1,16 +1,16 @@
package decoder
import (
"encoding/json"
"io"
)
func Jsonip(r io.Reader) (string, error) {
var v struct {
Ip string `json:"ip"`
Location string `json:"geo-ip"`
Help string `json:"API Help"`
}
err := json.NewDecoder(r).Decode(&v)
return v.Ip, err
}
package decoder
import (
"encoding/json"
"io"
)
func Jsonip(r io.Reader) (string, error) {
var v struct {
Ip string `json:"ip"`
Location string `json:"geo-ip"`
Help string `json:"API Help"`
}
err := json.NewDecoder(r).Decode(&v)
return v.Ip, err
}

View file

@ -1,42 +1,42 @@
package http
import (
"context"
"io"
"net"
"net/http"
httputils "dnsupdater/http"
"dnsupdater/ip/internal"
"dnsupdater/ip/resolver/decoder"
)
type Decoder func(io.Reader) (string, error)
type Service struct {
ServiceName string
Url string
Headers http.Header
Decoder Decoder
}
func (s Service) Name() string {
return s.ServiceName
}
func (s Service) Lookup(ctx context.Context) (net.IP, error) {
resp, err := httputils.Get(ctx, s.Url, s.Headers)
if err != nil {
return nil, err
}
if s.Decoder == nil {
s.Decoder = decoder.Text
}
body, err := s.Decoder(resp.Body)
if err != nil && err != io.EOF {
return nil, err
}
return internal.ParseIP(string(body))
}
package http
import (
"context"
"io"
"net"
"net/http"
httputils "dnsupdater/http"
"dnsupdater/ip/internal"
"dnsupdater/ip/resolver/decoder"
)
type Decoder func(io.Reader) (string, error)
type Service struct {
ServiceName string
Url string
Headers http.Header
Decoder Decoder
}
func (s Service) Name() string {
return s.ServiceName
}
func (s Service) Lookup(ctx context.Context) (net.IP, error) {
resp, err := httputils.Get(ctx, s.Url, s.Headers)
if err != nil {
return nil, err
}
if s.Decoder == nil {
s.Decoder = decoder.Text
}
body, err := s.Decoder(resp.Body)
if err != nil && err != io.EOF {
return nil, err
}
return internal.ParseIP(string(body))
}

View file

@ -1,85 +1,85 @@
package http
import (
"context"
"net"
"net/http"
"net/http/httptest"
"testing"
"github.com/stretchr/testify/assert"
)
func TestService_Name(t *testing.T) {
s := Service{ServiceName: "my_service"}
assert.Equal(t, "my_service", s.Name())
}
func TestService_Lookup(t *testing.T) {
server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
_, err := w.Write([]byte("255.240.85.2"))
assert.NoError(t, err)
}))
defer server.Close()
s := Service{Url: server.URL}
ip, err := s.Lookup(context.Background())
assert.NoError(t, err)
assert.Equal(t, net.IPv4(255, 240, 85, 2), ip)
}
func TestService_Lookup_WithHeaders(t *testing.T) {
server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
assert.Equal(t, "application/json", r.Header.Get("Content-Type"))
_, err := w.Write([]byte("125.74.233.13"))
assert.NoError(t, err)
}))
defer server.Close()
s := Service{
Url: server.URL,
Headers: http.Header{
"Content-Type": []string{"application/json"},
},
}
ip, err := s.Lookup(context.Background())
assert.NoError(t, err)
assert.Equal(t, net.IPv4(125, 74, 233, 13), ip)
}
func TestService_Lookup_HTTPError(t *testing.T) {
server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(404)
}))
defer server.Close()
s := Service{
Url: server.URL,
}
ip, err := s.Lookup(context.Background())
assert.EqualError(t, err, "HTTP Response: 404 Not Found")
assert.Nil(t, ip)
}
func TestService_Lookup_ParseError(t *testing.T) {
server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
_, err := w.Write([]byte("random_string"))
assert.NoError(t, err)
}))
defer server.Close()
s := Service{
Url: server.URL,
}
ip, err := s.Lookup(context.Background())
assert.EqualError(t, err, "invalid IP address: random_string")
assert.Nil(t, ip)
}
package http
import (
"context"
"net"
"net/http"
"net/http/httptest"
"testing"
"github.com/stretchr/testify/assert"
)
func TestService_Name(t *testing.T) {
s := Service{ServiceName: "my_service"}
assert.Equal(t, "my_service", s.Name())
}
func TestService_Lookup(t *testing.T) {
server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
_, err := w.Write([]byte("255.240.85.2"))
assert.NoError(t, err)
}))
defer server.Close()
s := Service{Url: server.URL}
ip, err := s.Lookup(context.Background())
assert.NoError(t, err)
assert.Equal(t, net.IPv4(255, 240, 85, 2), ip)
}
func TestService_Lookup_WithHeaders(t *testing.T) {
server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
assert.Equal(t, "application/json", r.Header.Get("Content-Type"))
_, err := w.Write([]byte("125.74.233.13"))
assert.NoError(t, err)
}))
defer server.Close()
s := Service{
Url: server.URL,
Headers: http.Header{
"Content-Type": []string{"application/json"},
},
}
ip, err := s.Lookup(context.Background())
assert.NoError(t, err)
assert.Equal(t, net.IPv4(125, 74, 233, 13), ip)
}
func TestService_Lookup_HTTPError(t *testing.T) {
server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(404)
}))
defer server.Close()
s := Service{
Url: server.URL,
}
ip, err := s.Lookup(context.Background())
assert.EqualError(t, err, "HTTP Response: 404 Not Found")
assert.Nil(t, ip)
}
func TestService_Lookup_ParseError(t *testing.T) {
server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
_, err := w.Write([]byte("random_string"))
assert.NoError(t, err)
}))
defer server.Close()
s := Service{
Url: server.URL,
}
ip, err := s.Lookup(context.Background())
assert.EqualError(t, err, "invalid IP address: random_string")
assert.Nil(t, ip)
}

View file

@ -1,70 +1,70 @@
package resolver
import (
"net/http"
"dnsupdater/ip/resolver/decoder"
httpres "dnsupdater/ip/resolver/http"
)
var services []Service
func Provide(service Service) {
services = append(services, service)
}
func Get(name string) Service {
for _, service := range services {
if service.Name() == name {
return service
}
}
return nil
}
func init() {
Provide(&httpres.Service{
ServiceName: "jsonip",
Url: "https://jsonip.com",
Decoder: decoder.Jsonip,
})
Provide(&httpres.Service{
ServiceName: "ifconfig.me",
Url: "https://ifconfig.me/ip",
})
Provide(&httpres.Service{
ServiceName: "ip.me",
Url: "https://ip.me",
Headers: http.Header{
"User-Agent": []string{"curl"},
},
})
Provide(&httpres.Service{
ServiceName: "ipecho",
Url: "http://ipecho.net/plain",
})
Provide(&httpres.Service{
ServiceName: "icanhazip",
Url: "https://icanhazip.com",
})
Provide(&httpres.Service{
ServiceName: "ipify",
Url: "https://api.ipify.org",
})
Provide(&httpres.Service{
ServiceName: "myip",
Url: "https://api.myip.com",
Decoder: decoder.MyIP,
})
Provide(&httpres.Service{
ServiceName: "my-ip",
Url: "https://api.my-ip.io/v2/ip.txt",
})
}
package resolver
import (
"net/http"
"dnsupdater/ip/resolver/decoder"
httpres "dnsupdater/ip/resolver/http"
)
var services []Service
func Provide(service Service) {
services = append(services, service)
}
func Get(name string) Service {
for _, service := range services {
if service.Name() == name {
return service
}
}
return nil
}
func init() {
Provide(&httpres.Service{
ServiceName: "jsonip",
Url: "https://jsonip.com",
Decoder: decoder.Jsonip,
})
Provide(&httpres.Service{
ServiceName: "ifconfig.me",
Url: "https://ifconfig.me/ip",
})
Provide(&httpres.Service{
ServiceName: "ip.me",
Url: "https://ip.me",
Headers: http.Header{
"User-Agent": []string{"curl"},
},
})
Provide(&httpres.Service{
ServiceName: "ipecho",
Url: "http://ipecho.net/plain",
})
Provide(&httpres.Service{
ServiceName: "icanhazip",
Url: "https://icanhazip.com",
})
Provide(&httpres.Service{
ServiceName: "ipify",
Url: "https://api.ipify.org",
})
Provide(&httpres.Service{
ServiceName: "myip",
Url: "https://api.myip.com",
Decoder: decoder.MyIP,
})
Provide(&httpres.Service{
ServiceName: "my-ip",
Url: "https://api.my-ip.io/v2/ip.txt",
})
}

View file

@ -1,19 +1,19 @@
package mock
import (
"context"
"net"
)
type Service struct {
IP net.IP
Error error
}
func (s Service) Name() string {
return "mock"
}
func (s Service) Lookup(ctx context.Context) (net.IP, error) {
return s.IP, s.Error
}
package mock
import (
"context"
"net"
)
type Service struct {
IP net.IP
Error error
}
func (s Service) Name() string {
return "mock"
}
func (s Service) Lookup(ctx context.Context) (net.IP, error) {
return s.IP, s.Error
}

View file

@ -1,15 +1,15 @@
package resolver
import (
"context"
"net"
)
// Interface that IP Lookup Services must implement.
type Service interface {
// Get the name of the serivce
Name() string
// Lookup the public ip.
Lookup(ctx context.Context) (net.IP, error)
}
package resolver
import (
"context"
"net"
)
// Interface that IP Lookup Services must implement.
type Service interface {
// Get the name of the serivce
Name() string
// Lookup the public ip.
Lookup(ctx context.Context) (net.IP, error)
}