### Using the Example Provider

Source: https://github.com/libdns/libdns/blob/master/libdnstest/README.md

Instantiate and use the example provider, which implements all libdns interfaces using in-memory storage. This provider is useful for ensuring that the tests pass against a known-good implementation.

```go
import "github.com/libdns/libdns/libdnstest/example"

provider := example.New("example.com.")
records, err := provider.GetRecords(ctx, "example.com.")
```

--------------------------------

### SetRecords Usage Example

Source: https://github.com/libdns/libdns/blob/master/_autodocs/01-interfaces.md

Example demonstrating how to use SetRecords to ensure specific records exist for a zone.

```go
// Ensure only 192.0.2.1 is an A record for example.com
records := []libdns.Record{
    libdns.Address{
        Name: "@",
        TTL:  3600 * time.Second,
        IP:   netip.MustParseAddr("192.0.2.1"),
    },
}

set, err := provider.SetRecords(ctx, "example.com.", records)
if err != nil {
    log.Fatal(err)
}

// Any other A records for @ are now removed; TXT and other types unaffected
```

--------------------------------

### Create DNS records

Source: https://github.com/libdns/libdns/blob/master/_autodocs/08-quick-reference.md

Examples for initializing various DNS record structures supported by libdns.

```go
// Address (A or AAAA)
libdns.Address{
    Name: "www",
    TTL:  3600 * time.Second,
    IP:   netip.MustParseAddr("192.0.2.1"),
}

// CNAME
libdns.CNAME{
    Name:   "alias",
    TTL:    3600 * time.Second,
    Target: "www.example.com.",
}

// TXT
libdns.TXT{
    Name: "_acme-challenge",
    TTL:  300 * time.Second,
    Text: "validation-string",
}

// MX
libdns.MX{
    Name:       "@",
    TTL:        3600 * time.Second,
    Preference: 10,
    Target:     "mail.example.com.",
}

// NS
libdns.NS{
    Name:   "@",
    TTL:    3600 * time.Second,
    Target: "ns1.example.com.",
}

// SRV
libdns.SRV{
    Service:   "xmpp",
    Transport: "tcp",
    Name:      "@",
    TTL:       3600 * time.Second,
    Priority:  10,
    Weight:    20,
    Port:      5222,
    Target:    "chat.example.com.",
}

// CAA
libdns.CAA{
    Name:  "@",
    TTL:   3600 * time.Second,
    Flags: 0,
    Tag:   "issue",
    Value: "letsencrypt.org",
}

// ServiceBinding (HTTPS)
libdns.ServiceBinding{
    Name:     "@",
    TTL:      3600 * time.Second,
    Scheme:   "https",
    Priority: 1,
    Target:   "cdn.example.com.",
    Params: libdns.SvcParams{
        "alpn": {"h2", "h3"},
    },
}
```

--------------------------------

### ServiceBinding Port Configuration

Source: https://github.com/libdns/libdns/blob/master/_autodocs/07-special-cases.md

Examples showing how to configure ports via URLSchemePort, SvcParams, or both simultaneously.

```go
// https://example.com:2443/
// Client looks up: _2443._https.example.com.
sb := libdns.ServiceBinding{
    Scheme:        "https",
    URLSchemePort: 2443,  // Port in the URL
    Name:          "example.com.",
    Priority:      1,
    Target:        "cdn.example.com.",
}
// Name becomes: _2443._https.example.com.
```

```go
sb := libdns.ServiceBinding{
    Scheme:   "https",
    Name:     "example.com.",
    Priority: 1,
    Target:   "cdn.example.com.",
    Params: libdns.SvcParams{
        "port": {"8443"},  // Connect to 8443, not 443
    },
}
// This changes what port the client connects to
// But the URL may still use default or specified port
```

```go
// URL: https://example.com:8888/
// Client looks up: _8888._https.example.com.
// Then connects to port 9999
sb := libdns.ServiceBinding{
    Scheme:        "https",
    URLSchemePort: 8888,  // Port in URL (must match)
    Name:          "example.com.",
    Priority:      1,
    Target:        "cdn.example.com.",
    Params: libdns.SvcParams{
        "port": {"9999"},  // Connection port (if different from URLSchemePort)
    },
}
```

--------------------------------

### Basic Test Suite Setup

Source: https://github.com/libdns/libdns/blob/master/libdnstest/README.md

Initialize the test suite with a provider and a domain. Run all defined tests against the provider.

```go
import "github.com/libdns/libdns/libdnstest"

suite := libdnstest.NewTestSuite(provider, "example.com.")
suite.RunTests(t)
```

--------------------------------

### Create Address Records

Source: https://github.com/libdns/libdns/blob/master/_autodocs/02-record-types.md

Example of initializing a slice of Address records and appending them via a provider.

```go
import (
    "net/netip"
    "time"
    "github.com/libdns/libdns"
)

records := []libdns.Record{
    libdns.Address{
        Name: "www",
        TTL:  3600 * time.Second,
        IP:   netip.MustParseAddr("192.0.2.1"),
    },
    libdns.Address{
        Name: "api",
        TTL:  3600 * time.Second,
        IP:   netip.MustParseAddr("2001:db8::1"),
    },
}

created, _ := provider.AppendRecords(ctx, "example.com.", records)
```

--------------------------------

### Implement RecordGetter usage

Source: https://github.com/libdns/libdns/blob/master/_autodocs/01-interfaces.md

Example demonstrating how to retrieve and iterate over DNS records using the RecordGetter interface.

```go
import (
    "context"
    "github.com/libdns/libdns"
)

provider := yourProvider()
ctx := context.Background()

records, err := provider.GetRecords(ctx, "example.com.")
if err != nil {
    log.Fatal(err)
}

for _, record := range records {
    rr := record.RR()
    fmt.Printf("%s %d %s %s\n", rr.Name, rr.TTL, rr.Type, rr.Data)
}
```

--------------------------------

### Create TXT Records

Source: https://github.com/libdns/libdns/blob/master/_autodocs/02-record-types.md

Example of creating and appending TXT records using the libdns provider interface.

```go
records := []libdns.Record{
    libdns.TXT{
        Name: "v=spf1",
        TTL:  3600 * time.Second,
        Text: "v=spf1 include:_spf.example.com ~all",
    },
    libdns.TXT{
        Name: "_acme-challenge",
        TTL:  300 * time.Second,
        Text: "validation-token-here",
    },
}

created, _ := provider.AppendRecords(ctx, "example.com.", records)
```

--------------------------------

### Run Provider Tests

Source: https://github.com/libdns/libdns/blob/master/_autodocs/04-testing.md

Example of initializing a test suite and running tests, including wrapping a provider that lacks ZoneLister support.

```go
import (
    "testing"
    "github.com/libdns/libdns/libdnstest"
)

func TestMyProvider(t *testing.T) {
    provider := &MyProvider{}
    // If MyProvider doesn't implement ZoneLister, wrap it:
    wrappedProvider := libdnstest.WrapNoZoneLister(provider)
    
    suite := libdnstest.NewTestSuite(wrappedProvider, "example.com.")
    suite.RunTests(t)  // ZoneLister test will be skipped
}
```

--------------------------------

### Implement RecordAppender usage

Source: https://github.com/libdns/libdns/blob/master/_autodocs/01-interfaces.md

Example demonstrating how to append new records to a DNS zone using the RecordAppender interface.

```go
records := []libdns.Record{
    libdns.Address{
        Name: "www",
        TTL:  3600 * time.Second,
        IP:   netip.MustParseAddr("192.0.2.1"),
    },
    libdns.TXT{
        Name: "_acme-challenge",
        TTL:  300 * time.Second,
        Text: "validation-string",
    },
}

created, err := provider.AppendRecords(ctx, "example.com.", records)
if err != nil {
    log.Fatal(err)
}

for _, r := range created {
    fmt.Printf("Created: %s\n", r.RR().Name)
}
```

--------------------------------

### Implement CustomRecord for testing

Source: https://github.com/libdns/libdns/blob/master/_autodocs/04-testing.md

Example of defining a custom record type and configuring the test suite to use it.

```go
type CustomRecord struct {
    libdns.RR
    ProviderID string
}

func (c CustomRecord) RR() libdns.RR {
    return c.RR
}

suite := libdnstest.NewTestSuite(provider, "example.com.")
suite.AppendRecordFunc = func(record libdns.Record) libdns.Record {
    return CustomRecord{
        RR:         record.RR(),
        ProviderID: "custom-id",
    }
}
suite.RunTests(t)
```

--------------------------------

### Set MX Records

Source: https://github.com/libdns/libdns/blob/master/_autodocs/02-record-types.md

Example of creating a slice of MX records and applying them via a provider.

```go
records := []libdns.Record{
    libdns.MX{
        Name:       "@",
        TTL:        3600 * time.Second,
        Preference: 10,
        Target:     "mail1.example.com.",
    },
    libdns.MX{
        Name:       "@",
        TTL:        3600 * time.Second,
        Preference: 20,
        Target:     "mail2.example.com.",
    },
}

created, _ := provider.SetRecords(ctx, "example.com.", records)
```

--------------------------------

### AbsoluteName Usage Examples

Source: https://github.com/libdns/libdns/blob/master/_autodocs/03-utility-functions.md

Demonstrates how to convert relative names to FQDNs, including handling of the zone root and existing FQDNs.

```go
import "github.com/libdns/libdns"

fqdn := libdns.AbsoluteName("www", "example.com.")
// Returns: "www.example.com."

fqdn = libdns.AbsoluteName("@", "example.com")
// Returns: "example.com."

fqdn = libdns.AbsoluteName("", "example.com.")
// Returns: "example.com." (empty string treated as "@")

fqdn = libdns.AbsoluteName("sub.example.com.", "ignored.com.")
// Returns: "sub.example.com." (already FQDN, zone ignored)

fqdn = libdns.AbsoluteName("sub", "example.com")
// Returns: "sub.example.com." (zone trailing dot added automatically)
```

--------------------------------

### Invoke ListZones Method

Source: https://github.com/libdns/libdns/blob/master/_autodocs/01-interfaces.md

Example usage of the ListZones method to retrieve and iterate over available DNS zones.

```go
zones, err := provider.ListZones(ctx)
if err != nil {
    log.Fatal(err)
}

for _, zone := range zones {
    fmt.Println(zone.Name)
}
```

--------------------------------

### Relative Name Examples

Source: https://github.com/libdns/libdns/blob/master/_autodocs/09-architecture.md

Examples of relative DNS names used within libdns, where names are relative to the zone root.

```go
// Input/output: relative names
"www"              // Relative to zone
"@"                // Zone root
"_acme-challenge"  // Relative to zone
```

--------------------------------

### Invoke AttemptZoneCleanup

Source: https://github.com/libdns/libdns/blob/master/_autodocs/04-testing.md

Example of calling the cleanup method within a test suite.

```go
suite := libdnstest.NewTestSuite(provider, "example.com.")
if err := suite.AttemptZoneCleanup(); err != nil {
    t.Fatalf("Cleanup failed: %v", err)
}
```

--------------------------------

### Get All Records

Source: https://github.com/libdns/libdns/blob/master/_autodocs/08-quick-reference.md

Retrieves all records for a specified zone.

```go
records, err := provider.GetRecords(ctx, "example.com.")
```

--------------------------------

### RelativeName Usage Examples

Source: https://github.com/libdns/libdns/blob/master/_autodocs/03-utility-functions.md

Demonstrates how to convert FQDNs to relative names, handling trailing dots and zone root cases.

```go
import "github.com/libdns/libdns"

name := libdns.RelativeName("sub.example.com", "example.com.")
// Returns: "sub"

name = libdns.RelativeName("example.com.", "example.com.")
// Returns: "@"

name = libdns.RelativeName("example.net", "example.com.")
// Returns: "example.net" (cannot be expressed relative)

name = libdns.RelativeName("sub.example.com.", "example.com")
// Returns: "sub" (trailing dots handled liberally)
```

--------------------------------

### Delete DNS Records

Source: https://github.com/libdns/libdns/blob/master/_autodocs/01-interfaces.md

Examples showing how to delete specific records and how to use wildcard matching by leaving fields empty.

```go
// Delete a specific record
records := []libdns.Record{
    libdns.TXT{
        Name: "_acme-challenge",
        TTL:  300 * time.Second,
        Text: "validation-string",
    },
}

deleted, err := provider.DeleteRecords(ctx, "example.com.", records)
if err != nil {
    log.Fatal(err)
}

// Delete any TXT records for a name (TTL and Text unspecified)
records = []libdns.Record{
    libdns.TXT{
        Name: "old-record",
        TTL:  0,
        Text: "",
    },
}

deleted, err = provider.DeleteRecords(ctx, "example.com.", records)
```

--------------------------------

### Relative Record Name Examples

Source: https://github.com/libdns/libdns/blob/master/_autodocs/05-implementation-guide.md

Demonstrates the relative naming convention used by libdns for record inputs and outputs.

```text
// Input/output naming convention
"www"              // → www.example.com.
"@"                // → example.com.
"_acme-challenge"  // → _acme-challenge.example.com.
"sub.domain"       // → sub.domain.example.com.
```

--------------------------------

### Configure TestSuite Options

Source: https://github.com/libdns/libdns/blob/master/_autodocs/04-testing.md

Example of configuring test suite options such as skipping specific record types before execution.

```go
suite := libdnstest.NewTestSuite(provider, "test.example.com.")
suite.SkipRRTypes = map[string]bool{"SRV": true}
suite.RunTests(t)
```

--------------------------------

### Interact with DNS Records using libdns and Cloudflare Provider

Source: https://github.com/libdns/libdns/blob/master/README.md

This example demonstrates how to use the libdns library with a specific provider (Cloudflare) to list, create/update, and delete DNS records. Ensure you have the appropriate provider package imported and configured.

```go
import (
	"github.com/libdns/cloudflare"
	"github.com/libdns/libdns"
)

ctx := context.TODO()

zone := "example.com."

// configure the DNS provider (choose any from github.com/libdns)
provider := cloudflare.Provider{APIToken: "topsecret"}

// list records
recs, err := provider.GetRecords(ctx, zone)

// create records (AppendRecords is similar, with different semantics)
newRecs, err := provider.SetRecords(ctx, zone, []libdns.Record{
	libdns.Address{
		Name:  "@",
		Value: netip.MustParseAddr("1.2.3.4"),
	},
})

// delete records
deletedRecs, err := provider.DeleteRecords(ctx, zone, []libdns.Record{
	libdns.TXT{
		Name: "subdomain",
		Text: "txt value I want to delete"
	},
})

// no matter which provider you use, the code stays the same!
// (some providers have caveats; see their package documentation)

```

--------------------------------

### Create CNAME Record

Source: https://github.com/libdns/libdns/blob/master/_autodocs/02-record-types.md

Example of creating a CNAME record. Note that using CNAME with AppendRecords can be problematic if other records exist at the same name.

```go
record := libdns.CNAME{
    Name:   "alias",
    TTL:    3600 * time.Second,
    Target: "www.example.com.",
}

created, _ := provider.AppendRecords(ctx, "example.com.", []libdns.Record{record})
```

--------------------------------

### Document DNSSEC Record Behavior

Source: https://github.com/libdns/libdns/blob/master/_autodocs/05-implementation-guide.md

Example of documenting whether a provider includes DNSSEC records in GetRecords results.

```go
// Provider documentation
/*
MyProvider GetRecords behavior:
- Includes standard RRs (A, AAAA, CNAME, etc.)
- Excludes DNSSEC-related RRs (RRSIG, DNSKEY, DS)
- DNSSEC can be managed separately via provider-specific APIs
*/
```

--------------------------------

### Create SRV Record

Source: https://github.com/libdns/libdns/blob/master/_autodocs/02-record-types.md

Example of creating an SRV record. The Target field must include a trailing dot.

```go
record := libdns.SRV{
    Service:   "xmpp",
    Transport: "tcp",
    Name:      "@",
    TTL:       3600 * time.Second,
    Priority:  10,
    Weight:    20,
    Port:      5222,
    Target:    "chat.example.com.",
}

created, _ := provider.AppendRecords(ctx, "example.com.", []libdns.Record{record})
```

--------------------------------

### Handle RFC 9460 Escape Sequences

Source: https://github.com/libdns/libdns/blob/master/_autodocs/07-special-cases.md

Examples of valid and invalid escape sequences for SvcParams parsing.

```go
input := `key="value\\nescaped"`  // Literal backslash and 'n'
input2 := `key="value\052comma"`   // Escaped comma (octal 052 = comma)
input3 := `key="value\"quote"`     // Escaped quote
```

```go
// These will fail to parse
input1 := `key="unescaped)paren"`   // Illegal unescaped character
input2 := `key="incomplete\"`       // Incomplete escape sequence
input3 := `key="bad\256octal"`      // Octal value out of range
```

--------------------------------

### Respect context cancellation in providers

Source: https://github.com/libdns/libdns/blob/master/_autodocs/09-architecture.md

Providers must check for context cancellation before starting and during iterative operations to ensure responsiveness.

```go
func (p *Provider) AppendRecords(ctx context.Context, zone string, recs []Record) ([]Record, error) {
    // Check before starting
    select {
    case <-ctx.Done():
        return nil, ctx.Err()
    default:
    }
    
    for _, rec := range recs {
        // Check during iteration
        select {
        case <-ctx.Done():
            return nil, ctx.Err()
        default:
        }
        
        p.apiCreateRecord(ctx, zone, rec)
    }
    
    return recs, nil
}
```

--------------------------------

### Define NS Records

Source: https://github.com/libdns/libdns/blob/master/_autodocs/02-record-types.md

Example of defining a slice of NS records for a zone.

```go
records := []libdns.Record{
    libdns.NS{
        Name:   "@",
        TTL:    3600 * time.Second,
        Target: "ns1.example.com.",
    },
    libdns.NS{
        Name:   "@",
        TTL:    3600 * time.Second,
        Target: "ns2.example.com.",
    },
}
```

--------------------------------

### Initialize and Run Test Suite

Source: https://github.com/libdns/libdns/blob/master/_autodocs/08-quick-reference.md

Use the libdnstest suite to validate provider implementations. Wrap providers lacking ZoneLister functionality using WrapNoZoneLister.

```go
import "github.com/libdns/libdns/libdnstest"

// Create test suite
suite := libdnstest.NewTestSuite(provider, "example.com.")

// Configure
suite.Timeout = 60 * time.Second
suite.SkipRRTypes = map[string]bool{"SRV": true}
suite.ExpectEmptyZone = true

// Run all tests
suite.RunTests(t)

// For providers without ZoneLister
wrapped := libdnstest.WrapNoZoneLister(provider)
suite := libdnstest.NewTestSuite(wrapped, "example.com.")
```

--------------------------------

### Create ServiceBinding Record

Source: https://github.com/libdns/libdns/blob/master/_autodocs/02-record-types.md

Demonstrates initializing a ServiceBinding record with specific parameters and appending it via a provider.

```go
record := libdns.ServiceBinding{
    Name:     "@",
    TTL:      3600 * time.Second,
    Scheme:   "https",
    Priority: 1,
    Target:   "cdn.example.com.",
    Params: libdns.SvcParams{
        "alpn":     {"h2", "h3"},
        "ipv4hint": {"192.0.2.1", "192.0.2.2"},
        "ipv6hint": {"2001:db8::1"},
    },
}

created, _ := provider.AppendRecords(ctx, "example.com.", []libdns.Record{record})
```

--------------------------------

### Manage context for libdns operations

Source: https://github.com/libdns/libdns/blob/master/_autodocs/08-quick-reference.md

Demonstrates how to apply timeouts, cancellation, and deadlines to provider operations.

```go
// With timeout
ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
defer cancel()
records, _ := provider.GetRecords(ctx, zone)

// Cancellable
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
records, _ := provider.GetRecords(ctx, zone)

// With deadline
deadline := time.Now().Add(5 * time.Second)
ctx, cancel := context.WithDeadline(context.Background(), deadline)
defer cancel()
```

--------------------------------

### Initialize and Run TestSuite

Source: https://github.com/libdns/libdns/blob/master/_autodocs/04-testing.md

Standard implementation of a provider test function using NewTestSuite and RunTests.

```go
import (
    "testing"
    "github.com/libdns/libdns/libdnstest"
)

func TestMyProvider(t *testing.T) {
    provider := &MyProvider{...}
    suite := libdnstest.NewTestSuite(provider, "example.com.")
    suite.RunTests(t)
}
```

--------------------------------

### Implement context-aware operations

Source: https://github.com/libdns/libdns/blob/master/_autodocs/09-architecture.md

Demonstrates how to use context.Context to manage cancellation and deadlines for long-running operations.

```go
// Long-running operation can be cancelled
ctx, cancel := context.WithCancel(context.Background())
go func() {
    time.Sleep(5 * time.Second)
    cancel()  // Cancel after 5 seconds
}()

records, err := provider.GetRecords(ctx, zone)
```

--------------------------------

### Test Suite Initialization and Execution

Source: https://github.com/libdns/libdns/blob/master/_autodocs/00-index.md

Utilities for running provider tests within the libdnstest package.

```go
type TestSuite struct
func NewTestSuite(provider Provider, zone string) *TestSuite
func (ts *TestSuite) RunTests(t *testing.T)
func (ts *TestSuite) AttemptZoneCleanup() error
```

--------------------------------

### Extending libdns with new record types

Source: https://github.com/libdns/libdns/blob/master/_autodocs/09-architecture.md

Demonstrates how to implement a new record type while maintaining compatibility with existing interfaces.

```go
// Future DNS record type added
type TLSA struct {
    Name string
    TTL  time.Duration
    // ... fields
}

func (t TLSA) RR() RR { ... }

// Existing code still works:
record.RR()  // Still works
record.RR().Parse()  // Parses to new TLSA type
```

--------------------------------

### View project file organization

Source: https://github.com/libdns/libdns/blob/master/_autodocs/README.md

A directory structure overview of the libdns documentation files.

```text
00-index.md              Overview & navigation
01-interfaces.md         Core interfaces
02-record-types.md       DNS record types
03-utility-functions.md  Helper functions
04-testing.md           Testing framework
05-implementation-guide.md  Provider implementation
06-common-patterns.md    Usage examples
07-special-cases.md      Edge cases
08-quick-reference.md    Condensed reference
09-architecture.md       Design & architecture
README.md               This file
```

--------------------------------

### Go Provider Documentation Template

Source: https://github.com/libdns/libdns/blob/master/_autodocs/05-implementation-guide.md

A standard Go package documentation template for libdns providers, detailing usage, atomicity, DNSSEC, rate limiting, and concurrency.

```go
/*
Package mypackage implements the libdns interfaces for MyDNS provider.

# Usage

    provider := &Provider{
        APIKey: "your-api-key",
    }

    records, err := provider.GetRecords(ctx, "example.com.")

# Atomicity

SetRecords operations are atomic; if an error occurs, the zone is unchanged.

# DNSSEC

GetRecords does not include DNSSEC-related records. These can be managed
via the provider's web interface.

# Rate Limiting

The provider implements automatic retry with exponential backoff for 429
and 5xx errors. Retries are limited to 3 attempts.

# Concurrency

All methods are safe for concurrent use.
*/
package mypackage
```

--------------------------------

### AttemptZoneCleanup()

Source: https://github.com/libdns/libdns/blob/master/_autodocs/04-testing.md

Deletes all test records (names starting with 'test-') from the zone. This method is called automatically before tests and can be invoked manually.

```APIDOC
## AttemptZoneCleanup()

### Description
Deletes all test records (names starting with "test-") from the zone. This method is called automatically before tests and can be invoked manually.

### Signature
`func (ts *TestSuite) AttemptZoneCleanup() error`

### Returns
- **error** (error) - Non-nil if cleanup fails.

### Cleanup Rules
- Deletes records with names starting with "test-".
- For SRV/SVCB records, strips up to two `_xxx.` prefixes before checking name.
- Respects SkipRRTypes configuration.
- Returns nil if no test records found.
```

--------------------------------

### Module Structure Overview

Source: https://github.com/libdns/libdns/blob/master/_autodocs/00-index.md

Visual representation of the libdns repository layout.

```text
github.com/libdns/libdns/
├── libdns.go          # Core interfaces and utilities
├── record.go          # Record interface and RR type
├── rrtypes.go         # Specific record types (Address, CNAME, etc.)
├── libdnstest/
│   └── libdnstest.go  # Testing utilities
└── go.mod             # Module declaration (Go 1.23+)
```

--------------------------------

### Implement Custom Provider

Source: https://github.com/libdns/libdns/blob/master/_autodocs/00-index.md

Define a struct and implement the required interface methods to create a custom DNS provider. Ensure all necessary record manipulation methods are defined.

```go
type MyProvider struct {
    apiKey string
}

func (p *MyProvider) GetRecords(ctx context.Context, zone string) ([]libdns.Record, error) {
    // Call API, convert to libdns types
    return records, nil
}

// Implement AppendRecords, SetRecords, DeleteRecords, optionally ListZones
```

--------------------------------

### Import libdnstest

Source: https://github.com/libdns/libdns/blob/master/_autodocs/04-testing.md

Import the libdnstest package to access testing utilities.

```go
import "github.com/libdns/libdns/libdnstest"
```

--------------------------------

### Construct SRV Record Names

Source: https://github.com/libdns/libdns/blob/master/_autodocs/05-implementation-guide.md

Demonstrates the mapping between libdns.SRV struct fields and the resulting absolute DNS name format.

```go
// Input: libdns.SRV
srv := libdns.SRV{
    Service:   "xmpp",
    Transport: "tcp",
    Name:      "example.com.",
    Priority:  10,
    Weight:    20,
    Port:      5222,
    Target:    "chat.example.com.",
}

// Converted to absolute name:
// _xmpp._tcp.example.com.

// When parsing from provider, extract components:
// _xmpp._tcp.example.com. →
//   Service: "xmpp" (underscore removed)
//   Transport: "tcp" (underscore removed)
//   Name: "example.com."
```

--------------------------------

### Convert DNS Names

Source: https://github.com/libdns/libdns/blob/master/_autodocs/06-common-patterns.md

Demonstrates converting between relative and absolute DNS names, including handling of zone roots.

```go
func nameConversionExamples(zone string) {
    // Convert to absolute names for external systems
    rel := "www"
    abs := libdns.AbsoluteName(rel, zone)
    fmt.Printf("Relative '%s' → Absolute '%s'\n", rel, abs)
    
    // Convert from absolute back to relative
    back := libdns.RelativeName(abs, zone)
    fmt.Printf("Absolute '%s' → Relative '%s'\n", abs, back)
    
    // Zone root handling
    root := libdns.AbsoluteName("@", zone)
    fmt.Printf("Zone root: %s\n", root)
    
    // Empty string equals "@"
    also_root := libdns.AbsoluteName("", zone)
    fmt.Printf("Empty string as root: %s\n", also_root)
}
```

--------------------------------

### Project File Organization

Source: https://github.com/libdns/libdns/blob/master/_autodocs/MANIFEST.md

Displays the directory structure of the generated documentation output.

```text
/workspace/home/output/
├── 00-index.md                    (Start here)
├── 01-interfaces.md               (Core API)
├── 02-record-types.md             (Record types)
├── 03-utility-functions.md        (Helpers)
├── 04-testing.md                  (Test framework)
├── 05-implementation-guide.md     (Provider implementation)
├── 06-common-patterns.md          (Usage patterns)
├── 07-special-cases.md            (Edge cases)
├── 08-quick-reference.md          (Quick lookup)
├── 09-architecture.md             (Design & philosophy)
├── README.md                      (Overview)
├── COMPLETION_SUMMARY.txt         (Project report)
└── MANIFEST.md                    (This file)
```

--------------------------------

### Initialize and Validate a libdns Provider

Source: https://github.com/libdns/libdns/blob/master/_autodocs/06-common-patterns.md

Initializes a provider using an environment variable and performs a connection test with a timeout. Ensure the DNS_API_TOKEN environment variable is set before calling this function.

```go
func initializeProvider() (libdns.RecordGetter, error) {
    apiToken := os.Getenv("DNS_API_TOKEN")
    if apiToken == "" {
        return nil, fmt.Errorf("DNS_API_TOKEN environment variable not set")
    }
    
    provider := &mydns.Provider{
        APIToken: apiToken,
    }
    
    // Test connection
    ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
    defer cancel()
    
    if _, err := provider.GetRecords(ctx, "example.com."); err != nil {
        return nil, fmt.Errorf("failed to connect to DNS provider: %w", err)
    }
    
    return provider, nil
}
```

--------------------------------

### Implement a Custom DNS Provider

Source: https://github.com/libdns/libdns/blob/master/_autodocs/00-index.md

Boilerplate for creating a new provider by implementing the required interfaces.

```go
import "github.com/libdns/libdns"

type MyProvider struct {
    // Your provider fields
}

func (p *MyProvider) GetRecords(ctx context.Context, zone string) ([]libdns.Record, error) {
    // Implementation
}

// Implement other interfaces as needed
```

--------------------------------

### Define Alias and Non-Alias ServiceBinding Records

Source: https://github.com/libdns/libdns/blob/master/_autodocs/07-special-cases.md

Demonstrates the structural difference between Alias mode (Priority 0) and standard ServiceBinding records.

```go
// Alias record (like CNAME but allowed at zone root)
sb := libdns.ServiceBinding{
    Scheme:   "https",
    Name:     "@",        // Allowed at zone root!
    Priority: 0,          // Indicates Alias mode
    Target:   "example.com.",  // Points to another name
    Params:   libdns.SvcParams{},  // Must be empty in Alias mode
}

// Non-alias record
sb2 := libdns.ServiceBinding{
    Scheme:   "https",
    Name:     "api",
    Priority: 1,          // Non-zero = not Alias mode
    Target:   "cdn.example.com.",
    Params:   libdns.SvcParams{"alpn": {"h2", "h3"}},
}
```

--------------------------------

### Parse Methods for Records and Parameters

Source: https://github.com/libdns/libdns/blob/master/_autodocs/00-index.md

Methods for parsing resource records and service parameters.

```go
func (r RR) RR() RR
func (r RR) Parse() (Record, error)
func (params SvcParams) String() string
func ParseSvcParams(input string) (SvcParams, error)
```

--------------------------------

### Manage SvcParams

Source: https://github.com/libdns/libdns/blob/master/_autodocs/08-quick-reference.md

Create, serialize, and parse SvcParams for DNS service records.

```go
// Create params
params := libdns.SvcParams{
    "alpn":     {"h2", "h3"},
    "ipv4hint": {"192.0.2.1"},
}

// Serialize
formatted := params.String()
// Output: "alpn=h2,h3 ipv4hint=192.0.2.1"

// Parse
parsed, _ := libdns.ParseSvcParams(formatted)
```

--------------------------------

### Run Provider Tests

Source: https://github.com/libdns/libdns/blob/master/_autodocs/00-index.md

Utilize the libdnstest suite to validate provider implementations.

```go
import "github.com/libdns/libdns/libdnstest"

suite := libdnstest.NewTestSuite(myProvider, "test.example.com.")
suite.RunTests(t)
```

--------------------------------

### Parse ServiceBinding Name Fields in Go

Source: https://github.com/libdns/libdns/blob/master/_autodocs/03-utility-functions.md

Demonstrates how ServiceBinding records are structured after parsing port and scheme prefixes from the name field.

```go
// Parsed from: _443._https.api.example.com
sb := libdns.ServiceBinding{
    Name: "api.example.com.",
    URLSchemePort: 443,
    Scheme: "https",
    Priority: 1,
    Target: "cdn.example.com.",
}

// Parsed from: _dns.recursive.example.com
sb = libdns.ServiceBinding{
    Name: "recursive.example.com.",
    Scheme: "dns",
    Priority: 1,
    Target: "ns.example.com.",
}
```

--------------------------------

### List DNS zones with ZoneLister

Source: https://github.com/libdns/libdns/blob/master/_autodocs/00-index.md

Use this optional interface to retrieve a list of available DNS zones.

```go
ListZones(ctx context.Context) ([]Zone, error)
```

--------------------------------

### Create CAA Records

Source: https://github.com/libdns/libdns/blob/master/_autodocs/02-record-types.md

Demonstrates initializing a slice of CAA records and appending them using a provider.

```go
records := []libdns.Record{
    libdns.CAA{
        Name:  "@",
        TTL:   3600 * time.Second,
        Flags: 0,
        Tag:   "issue",
        Value: "letsencrypt.org",
    },
    libdns.CAA{
        Name:  "@",
        TTL:   3600 * time.Second,
        Flags: 0,
        Tag:   "iodef",
        Value: "mailto:security@example.com",
    },
}

created, _ := provider.AppendRecords(ctx, "example.com.", records)
```

--------------------------------

### Create CNAME Record in Go

Source: https://github.com/libdns/libdns/blob/master/_autodocs/06-common-patterns.md

Creates a single CNAME record pointing a subdomain to a target host.

```go
func createCNAME(ctx context.Context, provider libdns.RecordSetter,
                 zone string, name string, target string) error {
    record := libdns.CNAME{
        Name:   name,
        TTL:    3600 * time.Second,
        Target: target,
    }
    
    _, err := provider.SetRecords(ctx, zone, []libdns.Record{record})
    return err
}
```

--------------------------------

### Provider Interfaces

Source: https://github.com/libdns/libdns/blob/master/_autodocs/00-index.md

Definitions for the core provider interfaces.

```go
type Provider interface // All 5 interfaces + ZoneLister
type RecordProvider interface // 4 record interfaces (no ZoneLister)
```

--------------------------------

### Implement Context with Timeout

Source: https://github.com/libdns/libdns/blob/master/_autodocs/06-common-patterns.md

Wrap provider operations with a context timeout to prevent hanging requests.

```go
func operationWithTimeout(provider libdns.RecordGetter, zone string,
                          timeout time.Duration) ([]libdns.Record, error) {
    ctx, cancel := context.WithTimeout(context.Background(), timeout)
    defer cancel()
    
    return provider.GetRecords(ctx, zone)
}

// Usage:
records, err := operationWithTimeout(provider, "example.com.", 10*time.Second)
if err != nil {
    log.Printf("Operation timed out or failed: %v", err)
}
```

--------------------------------

### Implement a DNS provider

Source: https://github.com/libdns/libdns/blob/master/_autodocs/README.md

Define a struct that implements the required interface methods, such as GetRecords, to integrate a new DNS provider.

```go
type MyProvider struct { /* ... */ }

func (p *MyProvider) GetRecords(ctx context.Context, zone string) ([]libdns.Record, error) {
    // Implementation
}
```

--------------------------------

### Test a real DNS provider with libdnstest

Source: https://github.com/libdns/libdns/blob/master/_autodocs/04-testing.md

Uses a dedicated test zone and requires environment variables for API authentication. Ensure tests run sequentially and clean up records after execution.

```go
func TestCloudflareProvider(t *testing.T) {
    if testing.Short() {
        t.Skip("Skipping integration test")
    }

    provider := &cloudflare.Provider{
        APIToken: os.Getenv("CLOUDFLARE_API_TOKEN"),
    }

    suite := libdnstest.NewTestSuite(provider, "test.example.com.")
    suite.ExpectEmptyZone = true
    suite.RunTests(t)
}
```

--------------------------------

### RunTests

Source: https://github.com/libdns/libdns/blob/master/_autodocs/04-testing.md

Executes the full suite of tests against the configured provider.

```APIDOC
## RunTests(t *testing.T)

### Description
Executes all tests against the provider sequentially. It validates interfaces including ListZones, GetRecords, AppendRecords, SetRecords, and DeleteRecords.

### Parameters
- **t** (*testing.T) - Required - The standard Go testing context.
```

--------------------------------

### Record Deletion Methods

Source: https://github.com/libdns/libdns/blob/master/_autodocs/07-special-cases.md

Demonstrates the difference between using generic RR types and structured, type-safe address types for record deletion.

```go
// Using RR (generic)
deleteRec := libdns.RR{
    Name: "test",
    Type: "A",
    TTL:  0,     // Wildcard
    Data: "",    // Wildcard
}

// Using structured type (type-safe)
deleteAddr := libdns.Address{
    Name: "test",
    TTL:  0,
    IP:   netip.Addr{},  // Zero value; some treat as wildcard
}
```

--------------------------------

### DNSSEC Provider Implementation Notes

Source: https://github.com/libdns/libdns/blob/master/_autodocs/07-special-cases.md

Providers handle DNSSEC records inconsistently; always consult specific provider documentation for support details.

```go
// A provider might:
// 1. Never include DNSSEC in GetRecords
// 2. Always include DNSSEC in GetRecords
// 3. Include DNSSEC in GetRecords but not support setting it

// The decision for SetRecords is independent:
// - Some providers reject DNSSEC records in SetRecords
// - Some providers silently ignore them
// - Some manage DNSSEC separately

// Always check provider documentation
```

--------------------------------

### Set HTTPS Service Binding Records in Go

Source: https://github.com/libdns/libdns/blob/master/_autodocs/06-common-patterns.md

Configures HTTPS service binding records with specific parameters like ALPN and IP hints.

```go
func setupHTTPSRecords(ctx context.Context, provider libdns.RecordSetter,
                       zone string) error {
    records := []libdns.Record{
        libdns.ServiceBinding{
            Name:     "@",
            TTL:      3600 * time.Second,
            Scheme:   "https",
            Priority: 1,
            Target:   "cdn.example.com.",
            Params: libdns.SvcParams{
                "alpn":     {"h2", "h3"},
                "ipv4hint": {"192.0.2.1", "192.0.2.2"},
                "ipv6hint": {"2001:db8::1"},
            },
        },
    }
    
    _, err := provider.SetRecords(ctx, zone, records)
    return err
}
```

--------------------------------

### NewTestSuite

Source: https://github.com/libdns/libdns/blob/master/_autodocs/04-testing.md

Creates a new test suite instance for a specific libdns provider and zone.

```APIDOC
## NewTestSuite(provider Provider, zone string) *TestSuite

### Description
Initializes a new test suite for a libdns provider. The suite is configured with a default timeout of 30 seconds.

### Parameters
- **provider** (Provider) - Required - Implementation of all libdns interfaces to test.
- **zone** (string) - Required - Test zone name with trailing dot (e.g., "example.com.").

### Returns
- **suite** (*TestSuite) - Configured test suite instance.
```

--------------------------------

### CNAME AppendRecords Usage

Source: https://github.com/libdns/libdns/blob/master/_autodocs/07-special-cases.md

Compares the problematic use of AppendRecords with CNAMEs against the recommended SetRecords approach.

```go
// ✗ Not recommended with AppendRecords
// If no "www" exists: creates CNAME (works like SetRecords)
// If "www" exists with other records: fails or leaves zone invalid
records := []libdns.Record{
    libdns.CNAME{Name: "www", Target: "example.com."},
}
_, err := provider.AppendRecords(ctx, zone, records)
```

```go
// ✓ Correct approach
records := []libdns.Record{
    libdns.CNAME{Name: "www", Target: "example.com."},
}
_, err := provider.SetRecords(ctx, zone, records)
// All other records at "www" are removed before CNAME is set
```

--------------------------------

### Test an in-memory provider with libdnstest

Source: https://github.com/libdns/libdns/blob/master/_autodocs/04-testing.md

Suitable for parallel execution as it lacks external dependencies and rate limits.

```go
func TestMemoryProvider(t *testing.T) {
    provider := memory.NewProvider()  // In-memory provider
    suite := libdnstest.NewTestSuite(provider, "example.com.")
    suite.ExpectEmptyZone = true
    suite.RunTests(t)
}
```

--------------------------------

### Provider Name Conversion

Source: https://github.com/libdns/libdns/blob/master/_autodocs/09-architecture.md

Demonstrates how a provider implementation converts relative names to absolute names before interacting with an external API.

```go
// Inside provider implementation
func (p *Provider) AppendRecords(ctx context.Context, zone string, recs []Record) ([]Record, error) {
    for _, rec := range recs {
        rr := rec.RR()
        // Convert relative to absolute for API
        absoluteName := libdns.AbsoluteName(rr.Name, zone)
        // Call provider API with absolute name
        p.apiCreateRecord(ctx, absoluteName, rr.Type, rr.Data)
    }
}
```

--------------------------------

### Enable ExpectEmptyZone

Source: https://github.com/libdns/libdns/blob/master/_autodocs/04-testing.md

Configures the suite to verify that only default records remain in the zone after tests finish.

```go
suite.ExpectEmptyZone = true
```

--------------------------------

### Create SRV Records in Go

Source: https://github.com/libdns/libdns/blob/master/_autodocs/06-common-patterns.md

Demonstrates appending an SRV record for a service using the RecordAppender interface.

```go
func createSRVRecord(ctx context.Context, provider libdns.RecordAppender,
                     zone string) error {
    record := libdns.SRV{
        Service:   "xmpp",
        Transport: "tcp",
        Name:      "@",
        TTL:       3600 * time.Second,
        Priority:  10,
        Weight:    20,
        Port:      5222,
        Target:    "chat.example.com.",
    }
    
    _, err := provider.AppendRecords(ctx, zone, []libdns.Record{record})
    return err
}
```

--------------------------------

### Import libdns packages

Source: https://github.com/libdns/libdns/blob/master/_autodocs/08-quick-reference.md

Required imports for utilizing the libdns library and testing utilities.

```go
import (
    "github.com/libdns/libdns"
    "github.com/libdns/libdns/libdnstest"
)
```

--------------------------------

### Set Email Security Records in Go

Source: https://github.com/libdns/libdns/blob/master/_autodocs/06-common-patterns.md

Configures SPF, DMARC, and DKIM TXT records for a domain using the libdns.RecordSetter interface.

```go
func setupEmailRecords(ctx context.Context, provider libdns.RecordSetter,
                       zone string) error {
    records := []libdns.Record{
        libdns.TXT{
            Name: "@",
            TTL:  3600 * time.Second,
            Text: "v=spf1 include:_spf.google.com ~all",
        },
        libdns.TXT{
            Name: "_dmarc",
            TTL:  3600 * time.Second,
            Text: "v=DMARC1; p=quarantine; rua=mailto:dmarc@example.com",
        },
        libdns.TXT{
            Name: "default._domainkey",
            TTL:  3600 * time.Second,
            Text: "v=DKIM1; k=rsa; p=MIGfMA0BgkqhkiG...",
        },
    }
    
    _, err := provider.SetRecords(ctx, zone, records)
    return err
}
```

--------------------------------

### Define Interface Segregation

Source: https://github.com/libdns/libdns/blob/master/_autodocs/09-architecture.md

Demonstrates the use of small, focused interfaces to allow providers to implement only the operations they support.

```go
// ✓ libdns approach: Small, focused interfaces
type RecordGetter interface {
    GetRecords(ctx context.Context, zone string) ([]Record, error)
}
```

--------------------------------

### Implement SetRecords logic

Source: https://github.com/libdns/libdns/blob/master/_autodocs/09-architecture.md

Provides a reference implementation for the SetRecords method, ensuring only input records exist for specific name/type pairs.

```go
func SetRecords(ctx context.Context, zone string, recs []Record) ([]Record, error) {
    // 1. Identify input (name, type) pairs
    inputPairs := extractPairs(recs)
    
    // 2. Get existing records
    existing, _ := GetRecords(ctx, zone)
    
    // 3. Find records to delete
    toDelete := findRecordsMatching(existing, inputPairs)
    
    // 4. Delete old, append new (atomic if possible)
    DeleteRecords(ctx, zone, toDelete)
    return AppendRecords(ctx, zone, recs)
}
```

--------------------------------

### Implement Context Cancellation in Provider Methods

Source: https://github.com/libdns/libdns/blob/master/_autodocs/05-implementation-guide.md

Ensure methods honor context cancellation by checking ctx.Done() before and between operations.

```go
func (p *MyProvider) GetRecords(ctx context.Context, zone string) ([]libdns.Record, error) {
    // Check context before making API calls
    select {
    case <-ctx.Done():
        return nil, ctx.Err()
    default:
    }
    
    // Perform operation
    // Check context between operations
    select {
    case <-ctx.Done():
        return nil, ctx.Err()
    default:
    }
    
    return records, nil
}
```

--------------------------------

### Set MX Records in Go

Source: https://github.com/libdns/libdns/blob/master/_autodocs/06-common-patterns.md

Configures multiple MX records with different preferences for mail routing.

```go
func setupMXRecords(ctx context.Context, provider libdns.RecordSetter,
                    zone string) error {
    records := []libdns.Record{
        libdns.MX{
            Name:       "@",
            TTL:        3600 * time.Second,
            Preference: 10,
            Target:     "mail.example.com.",
        },
        libdns.MX{
            Name:       "@",
            TTL:        3600 * time.Second,
            Preference: 20,
            Target:     "mail2.example.com.",
        },
    }
    
    _, err := provider.SetRecords(ctx, zone, records)
    return err
}
```

--------------------------------

### Name Conversion

Source: https://github.com/libdns/libdns/blob/master/_autodocs/08-quick-reference.md

Utilities for converting between relative and absolute domain names.

```go
// Relative to Absolute
absolute := libdns.AbsoluteName("www", "example.com.")
// Returns: "www.example.com."

// Absolute to Relative
relative := libdns.RelativeName("www.example.com.", "example.com.")
// Returns: "www"

// Zone root
root := libdns.AbsoluteName("@", "example.com.")
// Returns: "example.com."
```

--------------------------------

### Construct ServiceBinding Record Names

Source: https://github.com/libdns/libdns/blob/master/_autodocs/05-implementation-guide.md

Shows how Scheme and URLSchemePort fields influence the generated record name for ServiceBinding records.

```go
// HTTPS record (default scheme)
sb := libdns.ServiceBinding{
    Scheme:        "https",
    URLSchemePort: 0,  // Not needed for default port
    Name:          "example.com.",
    Priority:      1,
    Target:        "cdn.example.com.",
}

// Converts to: example.com. (no prefix for default HTTPS)

// HTTPS on non-default port
sb = libdns.ServiceBinding{
    Scheme:        "https",
    URLSchemePort: 2443,
    Name:          "example.com.",
    Priority:      1,
    Target:        "cdn.example.com.",
}

// Converts to: _2443._https.example.com.

// SVCB record with scheme
sb = libdns.ServiceBinding{
    Scheme:   "dns",
    Name:     "example.com.",
    Priority: 1,
    Target:   "dns.example.com.",
}

// Converts to: _dns.example.com.
```

--------------------------------

### Implement provider-specific error handling

Source: https://github.com/libdns/libdns/blob/master/_autodocs/05-implementation-guide.md

Provide descriptive errors for API-specific failures such as missing zones or rate limiting.

```go
func (p *MyProvider) AppendRecords(ctx context.Context, zone string, recs []libdns.Record) ([]libdns.Record, error) {
    // Check if zone exists
    if exists, err := p.apiZoneExists(ctx, zone); err != nil {
        return nil, fmt.Errorf("failed to verify zone: %w", err)
    } else if !exists {
        return nil, fmt.Errorf("zone %q not found in account", zone)
    }
    
    // Check API rate limits
    if limited, retryAfter := p.apiIsRateLimited(); limited {
        return nil, fmt.Errorf("rate limited; retry after %v", retryAfter)
    }
    
    // ... rest of implementation
}
```

--------------------------------

### Retrieve DNS records as an application developer

Source: https://github.com/libdns/libdns/blob/master/_autodocs/README.md

Use the GetRecords method to fetch DNS records for a specific zone. Ensure the provider is initialized before calling this method.

```go
import "github.com/libdns/libdns"

provider := yourDNSProvider()
records, err := provider.GetRecords(ctx, "example.com.")
```

--------------------------------

### Serialize SvcParams

Source: https://github.com/libdns/libdns/blob/master/_autodocs/02-record-types.md

Converts SvcParams into zone presentation format.

```go
params := libdns.SvcParams{
    "alpn":     {"h2", "h3"},
    "ipv4hint": {"192.0.2.1"},
}

formatted := params.String()
// Output: alpn=h2,h3 ipv4hint=192.0.2.1
```

--------------------------------

### TestSuite Definition

Source: https://github.com/libdns/libdns/blob/master/_autodocs/04-testing.md

Structure definition and constructor for the libdns provider test suite.

```go
type TestSuite struct {
    provider Provider
    zone string
    Timeout time.Duration
    AppendRecordFunc func(record libdns.Record) libdns.Record
    SkipRRTypes map[string]bool
    ExpectEmptyZone bool
}

func NewTestSuite(provider Provider, zone string) *TestSuite
func (ts *TestSuite) RunTests(t *testing.T)
```