actions

package
v0.1.2 Latest Latest
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 Go to latest Published: Nov 13, 2021 License: Apache-2.0 Imports: 36 Imported by: 0

Documentation

Overview

Package actions provides the infrastructure for defining and executing actions (code that is triggered in response to an client request) on horizon. At present it allows for defining actions that can respond using JSON or SSE.

Index

Constants

View Source 
const (
	// ParamCursor is a query string param name
	ParamCursor = "cursor"
	// ParamOrder is a query string param name
	ParamOrder = "order"
	// ParamLimit is a query string param name
	ParamLimit = "limit"
	// LastLedgerHeaderName is the header which is set on all endpoints
	LastLedgerHeaderName = "Latest-Ledger"
)

TODO: move these constants to urlparam.go as we should parse the params with http handlers in the upper level package.

Variables

View Source 
var DestinationAssetsOrDestinationAccountProblem = problem.P{
	Type:   "bad_request",
	Title:  "Bad Request",
	Status: http.StatusBadRequest,
	Detail: "The request requires either a list of destination assets or a destination account. " +
		"Both fields cannot be present.",
}

DestinationAssetsOrDestinationAccountProblem custom error where destination asserts or accounts are required

View Source 
var SourceAssetsOrSourceAccountProblem = problem.P{
	Type:   "bad_request",
	Title:  "Bad Request",
	Status: http.StatusBadRequest,
	Detail: "The request requires either a list of source assets or a source account. " +
		"Both fields cannot be present.",
}

SourceAssetsOrSourceAccountProblem custom error where source assets or account is required

Functions

func AccountInfo 

func AccountInfo(ctx context.Context, hq *history.Q, addr string) (*protocol.Account, error)

AccountInfo returns the information about an account identified by addr.

func FullURL 

func FullURL(ctx context.Context) *url.URL

FullURL returns a URL containing the information regarding the original request stored in the context.

func GetPageQuery 

func GetPageQuery(ledgerState *ledger.State, r *http.Request, opts ...Opt) (db2.PageQuery, error)

GetPageQuery is a helper that returns a new db.PageQuery struct initialized using the results from a call to GetPagingParams()

func GetTransactionID 

func GetTransactionID(r *http.Request, name string) (string, error)

GetTransactionID retireves a transaction identifier by attempting to decode an hex-encoded, 64-digit lowercase string at the provided name.

func SetLastLedgerHeader 

func SetLastLedgerHeader(w HeaderWriter, lastLedger uint32)

SetLastLedgerHeader sets the Latest-Ledger header

Types

type Account 

type Account protocol.Account

func (Account) Equals 

func (a Account) Equals(other StreamableObjectResponse) bool

type AccountByIDQuery 

type AccountByIDQuery struct {
	AccountID string `schema:"account_id" valid:"accountID,optional"`
}

AccountByIDQuery query struct for accounts/{account_id} end-point

type AccountDataQuery 

type AccountDataQuery struct {
	AccountID string `schema:"account_id" valid:"accountID"`
	Key       string `schema:"key" valid:"length(1|64)"`
}

AccountDataQuery query struct for account data end-point

type AccountOffersQuery 

type AccountOffersQuery struct {
	AccountID string `schema:"account_id" valid:"accountID,required"`
}

AccountOffersQuery query struct for offers end-point

type AccountsQuery 

type AccountsQuery struct {
	Signer      string `schema:"signer" valid:"accountID,optional"`
	Sponsor     string `schema:"sponsor" valid:"accountID,optional"`
	AssetFilter string `schema:"asset" valid:"asset,optional"`
}

AccountsQuery query struct for accounts end-point

func (AccountsQuery) Asset 

func (q AccountsQuery) Asset() *xdr.Asset

Asset returns an xdr.Asset representing the Asset we want to find the trustees by.

func (AccountsQuery) URITemplate 

func (q AccountsQuery) URITemplate() string

URITemplate returns a rfc6570 URI template the query struct

func (AccountsQuery) Validate 

func (q AccountsQuery) Validate() error

Validate runs custom validations.

type AssetStatsHandler 

type AssetStatsHandler struct {
	LedgerState *ledger.State
}

AssetStatsHandler is the action handler for the /asset endpoint

func (AssetStatsHandler) GetResourcePage 

func (handler AssetStatsHandler) GetResourcePage(
	w HeaderWriter,
	r *http.Request,
) ([]hal.Pageable, error)

GetResourcePage returns a page of offers.

type ClaimableBalanceQuery 

type ClaimableBalanceQuery struct {
	ID string `schema:"id" valid:"-"`
}

ClaimableBalanceQuery query struct for claimables_balances/id end-point

func (ClaimableBalanceQuery) Validate 

func (q ClaimableBalanceQuery) Validate() error

Validate validates the balance id

type ClaimableBalancesQuery 

type ClaimableBalancesQuery struct {
	AssetFilter    string `schema:"asset" valid:"asset,optional"`
	SponsorFilter  string `schema:"sponsor" valid:"accountID,optional"`
	ClaimantFilter string `schema:"claimant" valid:"accountID,optional"`
}

ClaimableBalancesQuery query struct for claimable_balances end-point

func (ClaimableBalancesQuery) URITemplate 

func (q ClaimableBalancesQuery) URITemplate() string

URITemplate returns a rfc6570 URI template the query struct

type CoreStateGetter 

type CoreStateGetter interface {
	GetCoreState() corestate.State
}

type EffectsQuery 

type EffectsQuery struct {
	AccountID   string `schema:"account_id" valid:"accountID,optional"`
	OperationID uint64 `schema:"op_id" valid:"-"`
	TxHash      string `schema:"tx_id" valid:"transactionHash,optional"`
	LedgerID    uint32 `schema:"ledger_id" valid:"-"`
}

EffectsQuery query struct for effects end-points

func (EffectsQuery) Validate 

func (qp EffectsQuery) Validate() error

Validate runs extra validations on query parameters

type FeeStatsHandler 

type FeeStatsHandler struct {
}

FeeStatsHandler is the action handler for the /fee_stats endpoint

func (FeeStatsHandler) GetResource 

func (handler FeeStatsHandler) GetResource(w HeaderWriter, r *http.Request) (interface{}, error)

GetResource fee stats resource

type FindFixedPathsHandler 

type FindFixedPathsHandler struct {
	MaxPathLength        uint
	MaxAssetsParamLength int
	SetLastLedgerHeader  bool
	PathFinder           paths.Finder
}

FindFixedPathsHandler is the http handler for the find fixed payment paths endpoint Fixed payment paths are payment paths where both the source and destination asset are fixed

func (FindFixedPathsHandler) GetResource 

func (handler FindFixedPathsHandler) GetResource(w HeaderWriter, r *http.Request) (interface{}, error)

GetResource returns a list of strict send paths

type FindFixedPathsQuery 

type FindFixedPathsQuery struct {
	DestinationAccount string `schema:"destination_account" valid:"accountID,optional"`
	DestinationAssets  string `schema:"destination_assets" valid:"-"`
	SourceAssetType    string `schema:"source_asset_type" valid:"assetType"`
	SourceAssetIssuer  string `schema:"source_asset_issuer" valid:"accountID,optional"`
	SourceAssetCode    string `schema:"source_asset_code" valid:"-"`
	SourceAmount       string `schema:"source_amount" valid:"amount"`
}

FindFixedPathsQuery query struct for paths/strict-send end-point

func (FindFixedPathsQuery) Amount 

func (q FindFixedPathsQuery) Amount() xdr.Int64

Amount returns source amount

func (FindFixedPathsQuery) Assets 

func (q FindFixedPathsQuery) Assets() ([]xdr.Asset, error)

Assets returns a list of xdr.Asset

func (FindFixedPathsQuery) SourceAsset 

func (q FindFixedPathsQuery) SourceAsset() xdr.Asset

SourceAsset returns an xdr.Asset

func (FindFixedPathsQuery) URITemplate 

func (q FindFixedPathsQuery) URITemplate() string

URITemplate returns a rfc6570 URI template for the query struct

func (FindFixedPathsQuery) Validate 

func (q FindFixedPathsQuery) Validate() error

Validate runs custom validations.

type FindPathsHandler 

type FindPathsHandler struct {
	StaleThreshold       uint
	MaxPathLength        uint
	SetLastLedgerHeader  bool
	MaxAssetsParamLength int
	PathFinder           paths.Finder
}

FindPathsHandler is the http handler for the find payment paths endpoint

func (FindPathsHandler) GetResource 

func (handler FindPathsHandler) GetResource(w HeaderWriter, r *http.Request) (interface{}, error)

GetResource finds a list of strict receive paths

type GetAccountByIDHandler 

type GetAccountByIDHandler struct{}

GetAccountByIDHandler is the action handler for the /accounts/{account_id} endpoint

func (GetAccountByIDHandler) GetResource 

func (handler GetAccountByIDHandler) GetResource(
	w HeaderWriter,
	r *http.Request,
) (StreamableObjectResponse, error)

type GetAccountDataHandler 

type GetAccountDataHandler struct{}

func (GetAccountDataHandler) GetResource 

func (handler GetAccountDataHandler) GetResource(w HeaderWriter, r *http.Request) (StreamableObjectResponse, error)

func (GetAccountDataHandler) WriteRawResponse 

func (handler GetAccountDataHandler) WriteRawResponse(w io.Writer, r *http.Request) error

type GetAccountOffersHandler 

type GetAccountOffersHandler struct {
	LedgerState *ledger.State
}

GetAccountOffersHandler is the action handler for the `/accounts/{account_id}/offers` endpoint when using experimental ingestion.

func (GetAccountOffersHandler) GetResourcePage 

func (handler GetAccountOffersHandler) GetResourcePage(
	w HeaderWriter,
	r *http.Request,
) ([]hal.Pageable, error)

GetResourcePage returns a page of offers for a given account.

type GetAccountsHandler 

type GetAccountsHandler struct {
	LedgerState *ledger.State
}

GetAccountsHandler is the action handler for the /accounts endpoint

func (GetAccountsHandler) GetResourcePage 

func (handler GetAccountsHandler) GetResourcePage(
	w HeaderWriter,
	r *http.Request,
) ([]hal.Pageable, error)

GetResourcePage returns a page containing the account records that have `signer` as a signer or have a trustline to the given asset.

type GetClaimableBalanceByIDHandler 

type GetClaimableBalanceByIDHandler struct{}

GetClaimableBalanceByIDHandler is the action handler for all end-points returning a claimable balance.

func (GetClaimableBalanceByIDHandler) GetResource 

func (handler GetClaimableBalanceByIDHandler) GetResource(w HeaderWriter, r *http.Request) (interface{}, error)

GetResource returns an claimable balance page.

type GetClaimableBalancesHandler 

type GetClaimableBalancesHandler struct {
	LedgerState *ledger.State
}

func (GetClaimableBalancesHandler) GetResourcePage 

func (handler GetClaimableBalancesHandler) GetResourcePage(
	w HeaderWriter,
	r *http.Request,
) ([]hal.Pageable, error)

GetResourcePage returns a page of claimable balances.

type GetEffectsHandler 

type GetEffectsHandler struct {
	LedgerState *ledger.State
}

func (GetEffectsHandler) GetResourcePage 

func (handler GetEffectsHandler) GetResourcePage(w HeaderWriter, r *http.Request) ([]hal.Pageable, error)

type GetLedgerByIDHandler 

type GetLedgerByIDHandler struct {
	LedgerState *ledger.State
}

func (GetLedgerByIDHandler) GetResource 

func (handler GetLedgerByIDHandler) GetResource(w HeaderWriter, r *http.Request) (interface{}, error)

type GetLedgersHandler 

type GetLedgersHandler struct {
	LedgerState *ledger.State
}

func (GetLedgersHandler) GetResourcePage 

func (handler GetLedgersHandler) GetResourcePage(w HeaderWriter, r *http.Request) ([]hal.Pageable, error)

type GetOfferByID 

type GetOfferByID struct{}

GetOfferByID is the action handler for the /offers/{id} endpoint

func (GetOfferByID) GetResource 

func (handler GetOfferByID) GetResource(w HeaderWriter, r *http.Request) (interface{}, error)

GetResource returns an offer by id.

type GetOffersHandler 

type GetOffersHandler struct {
	LedgerState *ledger.State
}

GetOffersHandler is the action handler for the /offers endpoint

func (GetOffersHandler) GetResourcePage 

func (handler GetOffersHandler) GetResourcePage(
	w HeaderWriter,
	r *http.Request,
) ([]hal.Pageable, error)

GetResourcePage returns a page of offers.

type GetOperationByIDHandler 

type GetOperationByIDHandler struct {
	LedgerState *ledger.State
}

GetOperationByIDHandler is the action handler for all end-points returning a list of operations.

func (GetOperationByIDHandler) GetResource 

func (handler GetOperationByIDHandler) GetResource(w HeaderWriter, r *http.Request) (interface{}, error)

GetResource returns an operation page.

type GetOperationsHandler 

type GetOperationsHandler struct {
	LedgerState  *ledger.State
	OnlyPayments bool
}

GetOperationsHandler is the action handler for all end-points returning a list of operations.

func (GetOperationsHandler) GetResourcePage 

func (handler GetOperationsHandler) GetResourcePage(w HeaderWriter, r *http.Request) ([]hal.Pageable, error)

GetResourcePage returns a page of operations.

type GetOrderbookHandler 

type GetOrderbookHandler struct {
}

GetOrderbookHandler is the action handler for the /order_book endpoint

func (GetOrderbookHandler) GetResource 

func (handler GetOrderbookHandler) GetResource(w HeaderWriter, r *http.Request) (StreamableObjectResponse, error)

GetResource implements the /order_book endpoint

type GetRootHandler 

type GetRootHandler struct {
	LedgerState *ledger.State
	CoreStateGetter
	NetworkPassphrase string
	FriendbotURL      *url.URL
	HorizonVersion    string
}

func (GetRootHandler) GetResource 

func (handler GetRootHandler) GetResource(w HeaderWriter, r *http.Request) (interface{}, error)

type GetTradeAggregationsHandler 

type GetTradeAggregationsHandler struct {
	LedgerState *ledger.State
}

GetTradeAggregationsHandler is the action handler for trade_aggregations

func (GetTradeAggregationsHandler) GetResource 

func (handler GetTradeAggregationsHandler) GetResource(w HeaderWriter, r *http.Request) (interface{}, error)

GetResourcePage returns a page of trade aggregations

type GetTradesHandler 

type GetTradesHandler struct {
	LedgerState *ledger.State
}

GetTradesHandler is the action handler for all end-points returning a list of trades.

func (GetTradesHandler) GetResourcePage 

func (handler GetTradesHandler) GetResourcePage(w HeaderWriter, r *http.Request) ([]hal.Pageable, error)

GetResourcePage returns a page of trades.

type GetTransactionByHashHandler 

type GetTransactionByHashHandler struct {
}

GetTransactionByHashHandler is the action handler for the end-point returning a transaction.

func (GetTransactionByHashHandler) GetResource 

func (handler GetTransactionByHashHandler) GetResource(w HeaderWriter, r *http.Request) (interface{}, error)

GetResource returns a transaction page.

type GetTransactionsHandler 

type GetTransactionsHandler struct {
	LedgerState *ledger.State
}

GetTransactionsHandler is the action handler for all end-points returning a list of transactions.

func (GetTransactionsHandler) GetResourcePage 

func (handler GetTransactionsHandler) GetResourcePage(w HeaderWriter, r *http.Request) ([]hal.Pageable, error)

GetResourcePage returns a page of transactions.

type HeaderWriter 

type HeaderWriter interface {
	Header() http.Header
}

HeaderWriter is an interface for setting HTTP response headers

type Joinable 

type Joinable struct {
	Join string `schema:"join" valid:"in(transactions)~Accepted values: transactions,optional"`
}

Joinable query struct for join query parameter

func (Joinable) IncludeTransactions 

func (qp Joinable) IncludeTransactions() bool

IncludeTransactions returns extra fields to include in the response

type LedgerByIDQuery 

type LedgerByIDQuery struct {
	LedgerID uint32 `schema:"ledger_id" valid:"-"`
}

LedgerByIDQuery query struct for the ledger/{id} endpoint

type OfferByIDQuery 

type OfferByIDQuery struct {
	OfferID uint64 `schema:"offer_id" valid:"-"`
}

AccountOffersQuery query struct for offers end-point

type OffersQuery 

type OffersQuery struct {
	SellingBuyingAssetQueryParams `valid:"-"`
	Seller                        string `schema:"seller" valid:"accountID,optional"`
	Sponsor                       string `schema:"sponsor" valid:"accountID,optional"`
}

OffersQuery query struct for offers end-point

func (OffersQuery) URITemplate 

func (q OffersQuery) URITemplate() string

URITemplate returns a rfc6570 URI template the query struct

func (OffersQuery) Validate 

func (q OffersQuery) Validate() error

Validate runs custom validations.

type OperationQuery 

type OperationQuery struct {
	LedgerState *ledger.State `valid:"-"`
	Joinable    `valid:"optional"`
	ID          uint64 `schema:"id" valid:"-"`
}

OperationQuery query struct for operation/id end-point

func (OperationQuery) Validate 

func (qp OperationQuery) Validate() error

Validate runs extra validations on query parameters

type OperationsQuery 

type OperationsQuery struct {
	Joinable                  `valid:"optional"`
	AccountID                 string `schema:"account_id" valid:"accountID,optional"`
	ClaimableBalanceID        string `schema:"claimable_balance_id" valid:"claimableBalanceID,optional"`
	TransactionHash           string `schema:"tx_id" valid:"transactionHash,optional"`
	IncludeFailedTransactions bool   `schema:"include_failed" valid:"-"`
	LedgerID                  uint32 `schema:"ledger_id" valid:"-"`
}

OperationsQuery query struct for operations end-points

func (OperationsQuery) Validate 

func (qp OperationsQuery) Validate() error

Validate runs extra validations on query parameters

type Opt 

type Opt int
const (
	// DisableCursorValidation disables cursor validation in GetPageQuery
	DisableCursorValidation Opt = iota
)

type OrderBookResponse 

type OrderBookResponse struct {
	protocol.OrderBookSummary
}

OrderBookResponse is the response for the /order_book endpoint OrderBookResponse implements StreamableObjectResponse

func (OrderBookResponse) Equals 

func (o OrderBookResponse) Equals(other StreamableObjectResponse) bool

Equals returns true if the OrderBookResponse is equal to `other`

type SellingBuyingAssetQueryParams 

type SellingBuyingAssetQueryParams struct {
	SellingAssetType   string `schema:"selling_asset_type" valid:"assetType,optional"`
	SellingAssetIssuer string `schema:"selling_asset_issuer" valid:"accountID,optional"`
	SellingAssetCode   string `schema:"selling_asset_code" valid:"-"`
	BuyingAssetType    string `schema:"buying_asset_type" valid:"assetType,optional"`
	BuyingAssetIssuer  string `schema:"buying_asset_issuer" valid:"accountID,optional"`
	BuyingAssetCode    string `schema:"buying_asset_code" valid:"-"`

	// allow selling and buying using an asset's canonical representation. We
	// are keeping the former selling_* and buying_* for backwards compatibility
	// but it should not be documented.
	SellingAsset string `schema:"selling" valid:"asset,optional"`
	BuyingAsset  string `schema:"buying" valid:"asset,optional"`
}

SellingBuyingAssetQueryParams query struct for end-points requiring a selling and buying asset

func (SellingBuyingAssetQueryParams) Buying 

func (q SellingBuyingAssetQueryParams) Buying() (*xdr.Asset, error)

Buying returns an *xdr.Asset representing the buying side of the offer.

func (SellingBuyingAssetQueryParams) Selling 

func (q SellingBuyingAssetQueryParams) Selling() (*xdr.Asset, error)

Selling returns an xdr.Asset representing the selling side of the offer.

func (SellingBuyingAssetQueryParams) Validate 

func (q SellingBuyingAssetQueryParams) Validate() error

Validate runs custom validations buying and selling

type StreamableObjectResponse 

type StreamableObjectResponse interface {
	Equals(other StreamableObjectResponse) bool
}

StreamableObjectResponse is an interface for objects returned by streamable object endpoints A streamable object endpoint is an SSE endpoint which returns a single JSON object response instead of a page of items.

type StrictReceivePathsQuery 

type StrictReceivePathsQuery struct {
	SourceAssets           string `schema:"source_assets" valid:"-"`
	SourceAccount          string `schema:"source_account" valid:"accountID,optional"`
	DestinationAccount     string `schema:"destination_account" valid:"accountID,optional"`
	DestinationAssetType   string `schema:"destination_asset_type" valid:"assetType"`
	DestinationAssetIssuer string `schema:"destination_asset_issuer" valid:"accountID,optional"`
	DestinationAssetCode   string `schema:"destination_asset_code" valid:"-"`
	DestinationAmount      string `schema:"destination_amount" valid:"amount"`
}

StrictReceivePathsQuery query struct for paths/strict-send end-point

func (StrictReceivePathsQuery) Amount 

func (q StrictReceivePathsQuery) Amount() xdr.Int64

Amount returns source amount

func (StrictReceivePathsQuery) Assets 

func (q StrictReceivePathsQuery) Assets() ([]xdr.Asset, error)

Assets returns a list of xdr.Asset

func (StrictReceivePathsQuery) DestinationAsset 

func (q StrictReceivePathsQuery) DestinationAsset() xdr.Asset

DestinationAsset returns an xdr.Asset

func (StrictReceivePathsQuery) URITemplate 

func (q StrictReceivePathsQuery) URITemplate() string

URITemplate returns a rfc6570 URI template for the query struct

func (StrictReceivePathsQuery) Validate 

func (q StrictReceivePathsQuery) Validate() error

Validate runs custom validations.

type SubmitTransactionHandler 

type SubmitTransactionHandler struct {
	Submitter         *txsub.System
	NetworkPassphrase string
	CoreStateGetter
}

func (SubmitTransactionHandler) GetResource 

func (handler SubmitTransactionHandler) GetResource(w HeaderWriter, r *http.Request) (interface{}, error)

type TradeAggregationsQuery 

type TradeAggregationsQuery struct {
	OffsetFilter           uint64      `schema:"offset" valid:"-"`
	StartTimeFilter        time.Millis `schema:"start_time" valid:"-"`
	EndTimeFilter          time.Millis `schema:"end_time" valid:"-"`
	ResolutionFilter       uint64      `schema:"resolution" valid:"-"`
	TradeAssetsQueryParams `valid:"optional"`
}

TradeAggregationsQuery query struct for trade_aggregations end-point

func (TradeAggregationsQuery) Validate 

func (q TradeAggregationsQuery) Validate() error

Validate runs validations on tradeAggregationsQuery

type TradeAssetsQueryParams 

type TradeAssetsQueryParams struct {
	BaseAssetType      string `schema:"base_asset_type" valid:"assetType,optional"`
	BaseAssetIssuer    string `schema:"base_asset_issuer" valid:"accountID,optional"`
	BaseAssetCode      string `schema:"base_asset_code" valid:"-"`
	CounterAssetType   string `schema:"counter_asset_type" valid:"assetType,optional"`
	CounterAssetIssuer string `schema:"counter_asset_issuer" valid:"accountID,optional"`
	CounterAssetCode   string `schema:"counter_asset_code" valid:"-"`
}

TradeAssetsQueryParams represents the base and counter assets on trade related end-points.

func (TradeAssetsQueryParams) Base 

func (q TradeAssetsQueryParams) Base() (*xdr.Asset, error)

Base returns an xdr.Asset representing the base side of the trade.

func (TradeAssetsQueryParams) Counter 

func (q TradeAssetsQueryParams) Counter() (*xdr.Asset, error)

Counter returns an *xdr.Asset representing the counter asset side of the trade.

type TradesQuery 

type TradesQuery struct {
	AccountID              string `schema:"account_id" valid:"accountID,optional"`
	OfferID                uint64 `schema:"offer_id" valid:"-"`
	TradeAssetsQueryParams `valid:"optional"`
}

TradesQuery query struct for trades end-points

func (TradesQuery) Validate 

func (q TradesQuery) Validate() error

Validate runs custom validations base and counter

type TransactionQuery 

type TransactionQuery struct {
	TransactionHash string `schema:"tx_id" valid:"transactionHash,optional"`
}

TransactionQuery query struct for transactions/id end-point

type TransactionsQuery 

type TransactionsQuery struct {
	AccountID                 string `schema:"account_id" valid:"accountID,optional"`
	ClaimableBalanceID        string `schema:"claimable_balance_id" valid:"claimableBalanceID,optional"`
	IncludeFailedTransactions bool   `schema:"include_failed" valid:"-"`
	LedgerID                  uint32 `schema:"ledger_id" valid:"-"`
}

TransactionsQuery query struct for transactions end-points

func (TransactionsQuery) Validate 

func (qp TransactionsQuery) Validate() error

Validate runs extra validations on query parameters

type Validateable 

type Validateable interface {
	Validate() error
}

Validateable allow structs to define their own custom validations.

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