federation

Documentation

Overview

Package federation provides a pluggable handler that satisfies the DigitalBits federation protocol. Add an instance of `Handler` onto your router to allow a server to satisfy the protocol.

The central type in this package is the "Driver" interfaces. Implementing these interfaces allows a developer to plug in their own back end, whether it be a RDBMS, a KV store, or even just an in memory data structure.

A pre-baked implementation of `Driver` and `ReverseDriver` that provides simple access to SQL systems is included. See `SQLDriver` for more details.

Index

• type Driver
• type ErrorResponse
  • func (response ErrorResponse) Error() string
• type ForwardDriver
• type Handler
  • func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request)
• type Record
• type ReverseDriver
• type ReverseRecord
• type ReverseSQLDriver
  • func (drv *ReverseSQLDriver) LookupReverseRecord(accountid string) (*ReverseRecord, error)
• type SQLDriver
  • func (drv *SQLDriver) LookupRecord(name, domain string) (*Record, error)

Types

type Driver

type Driver interface {
	// LookupRecord is called when a handler receives a so-called "name"
	// federation request to lookup a `Record` using the provided digitalbits address.
	// An implementation should return a nil `*Record` value if the lookup
	// successfully executed but no result was found.
	LookupRecord(name string, domain string) (*Record, error)
}

Driver represents a data source against which federation queries can be executed.

type ErrorResponse

type ErrorResponse struct {
	StatusCode int    `json:"-"`
	Code       string `json:"code"`
	Message    string `json:"message"`
}

ErrorResponse represents the JSON response sent to a client when the request triggered an error. FederationDriver methods can return this as an error and it will be passed to end user.

func (ErrorResponse) Error

func (response ErrorResponse) Error() string

type ForwardDriver

type ForwardDriver interface {
	// Forward is called when a handler receives a so-called "forward"
	// federation request to lookup a `Record` using the provided data (ex. bank
	// account number).
	// An implementation should return a nil `*Record` value if the lookup
	// successfully executed but no result was found.
	LookupForwardingRecord(query url.Values) (*Record, error)
}

ForwardDriver represents a data source against which forward queries can be executed.

type Handler

type Handler struct {
	// Driver is the backend against which queries will be evaluated.
	Driver Driver
}

Handler represents an http handler that can service http requests that conform to the DigitalBits federation protocol. This handler should be added to your chosen mux at the path `/federation` (and for good measure `/federation/` if your middleware doesn't normalize trailing slashes).

func (*Handler) ServeHTTP

func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request)

type Record

type Record struct {
	AccountID string `db:"id"`
	MemoType  string `db:"memo_type"`
	Memo      string `db:"memo"`
}

Record represents the result from the database when performing a federation request.

type ReverseDriver

type ReverseDriver interface {
	// LookupReverseRecord is called when a handler receives a "reverse"
	// federation request to lookup a `ReverseRecord` using the provided strkey
	// encoded accountID. An implementation should return a nil `*ReverseRecord`
	// value if the lookup successfully executed but no result was found.
	LookupReverseRecord(accountID string) (*ReverseRecord, error)
}

ReverseDriver represents a data source against which federation queries can be executed.

type ReverseRecord

type ReverseRecord struct {
	Name   string `db:"name"`
	Domain string `db:"domain"`
}

ReverseRecord represents the result from performing a "Reverse federation" lookup, in which an Account ID is used to lookup an associated address.

type ReverseSQLDriver

type ReverseSQLDriver struct {
	SQLDriver

	// LookupReverseRecordQuery is a SQL query used for performing "reverse"
	// federation queries.  This query should accomodate a single parameter, using
	// "?" as the placeholder.  This provided parameter will be a strkey-encoded
	// digitalbits account id to lookup, such as
	// "GDOP3VI4UA5LS7AMLJI66RJUXEQ4HX46WUXTRTJGI5IKDLNWUBOW3FUK".
	LookupReverseRecordQuery string
}

ReverseSQLDriver provides a `ReverseDriver` implementation based upon a SQL Server. See `SQLDriver`, the forward only version, for more details.

func (*ReverseSQLDriver) LookupReverseRecord

func (drv *ReverseSQLDriver) LookupReverseRecord(
	accountid string,
) (*ReverseRecord, error)

LookupReverseRecord implements `ReverseDriver` by performing `drv.LookupReverseRecordQuery` against `drv.DB` using the provided parameter

type SQLDriver

type SQLDriver struct {
	// DB is the target database that federation queries will be executed against
	DB *sql.DB

	// Dialect is the type of database peer field `DB` is communicating with.  It
	// is equivalent to the `driverName` params used in a call to `sql.Open` from
	// the standard library.
	Dialect string

	// LookupRecordQuery is a SQL query used for performing "forward" federation
	// queries.  This query should accomodate one or two parameters, using "?" as
	// the placeholder.  This provided parameters will be a name and domain
	LookupRecordQuery string
	// contains filtered or unexported fields
}

SQLDriver represents an implementation of `Driver` that provides a simple way to incorporate a SQL-backed federation handler into an application. Note: this type is not designed for dynamic configuration changes. Once a method is called on the struct the public fields of this struct should be considered frozen.

func (*SQLDriver) LookupRecord

func (drv *SQLDriver) LookupRecord(name, domain string) (*Record, error)

LookupRecord implements `Driver` by performing `drv.LookupRecordQuery` against `drv.DB` using the provided parameters