horizon

package
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Published: Dec 9, 2022 License: Apache-2.0, Apache-2.0 Imports: 46 Imported by: 0

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Constants

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const (
	// DatabaseURLFlagName is the command line flag for configuring the Horizon postgres URL
	DatabaseURLFlagName = "db-url"
	// StellarCoreDBURLFlagName is the command line flag for configuring the postgres Stellar Core URL
	StellarCoreDBURLFlagName = "stellar-core-db-url"
	// StellarCoreURLFlagName is the command line flag for configuring the URL fore Stellar Core HTTP endpoint
	StellarCoreURLFlagName = "stellar-core-url"
	// StellarCoreBinaryPathName is the command line flag for configuring the path to the stellar core binary
	StellarCoreBinaryPathName = "stellar-core-binary-path"

	// CaptiveCoreConfigPathName is the command line flag for configuring the path to the captive core configuration file
	CaptiveCoreConfigPathName = "captive-core-config-path"
	// captive-core-use-db is the command line flag for enabling captive core runtime to use an external db url connection rather than RAM for ledger states
	CaptiveCoreConfigUseDB = "captive-core-use-db"
)

Variables

This section is empty.

Functions

func ApplyFlags

func ApplyFlags(config *Config, flags support.ConfigOptions, options ApplyOptions) error

ApplyFlags applies the command line flags on the given Config instance

Types

type App

type App struct {
	// contains filtered or unexported fields
}

App represents the root of the state of a horizon instance.

func NewApp

func NewApp(config Config) (*App, error)

NewApp constructs an new App instance from the provided config.

func NewAppFromFlags

func NewAppFromFlags(config *Config, flags support.ConfigOptions) (*App, error)

NewAppFromFlags constructs a new Horizon App from the given command line flags

func (*App) Close

func (a *App) Close()

Close cancels the app. It does not close DB connections - use App.CloseDB().

func (*App) CloseDB

func (a *App) CloseDB()

CloseDB closes DB connections. When using during web server shut down make sure all requests are first properly finished to avoid "sql: database is closed" errors.

func (*App) Config

func (a *App) Config() Config

func (*App) DeleteUnretainedHistory

func (a *App) DeleteUnretainedHistory(ctx context.Context) error

DeleteUnretainedHistory forwards to the app's reaper. See `reap.DeleteUnretainedHistory` for details

func (*App) GetCoreState

func (a *App) GetCoreState() corestate.State

func (*App) HistoryQ

func (a *App) HistoryQ() *history.Q

HistoryQ returns a helper object for performing sql queries against the history portion of horizon's database.

func (*App) HorizonSession

func (a *App) HorizonSession() db.SessionInterface

HorizonSession returns a new session that loads data from the horizon database.

func (*App) Paths

func (a *App) Paths() paths.Finder

Paths returns the paths.Finder instance used by horizon

func (*App) Serve

func (a *App) Serve() error

Serve starts the horizon web server, binding it to a socket, setting up the shutdown signals.

func (*App) Tick

func (a *App) Tick(ctx context.Context) error

Tick triggers horizon to update all of it's background processes such as transaction submission, metrics, ingestion and reaping.

func (*App) UpdateCoreLedgerState

func (a *App) UpdateCoreLedgerState(ctx context.Context)

UpdateCoreLedgerState triggers a refresh of Stellar-Core ledger state. This is done separately from Horizon ledger state update to prevent issues in case Stellar-Core query timeout.

func (*App) UpdateFeeStatsState

func (a *App) UpdateFeeStatsState(ctx context.Context)

UpdateFeeStatsState triggers a refresh of several operation fee metrics.

func (*App) UpdateHorizonLedgerState

func (a *App) UpdateHorizonLedgerState(ctx context.Context)

UpdateHorizonLedgerState triggers a refresh of Horizon ledger state. This is done separately from Core ledger state update to prevent issues in case Stellar-Core query timeout.

func (*App) UpdateStellarCoreInfo

func (a *App) UpdateStellarCoreInfo(ctx context.Context) error

UpdateStellarCoreInfo updates the value of CoreVersion, CurrentProtocolVersion, and CoreSupportedProtocolVersion from the Stellar core API.

Warning: This method should only return an error if it is fatal. See usage in `App.Tick`

type ApplyOptions

type ApplyOptions struct {
	AlwaysIngest             bool
	RequireCaptiveCoreConfig bool
}

type Config

type Config struct {
	DatabaseURL        string
	RoDatabaseURL      string
	HistoryArchiveURLs []string
	Port               uint
	AdminPort          uint

	EnableCaptiveCoreIngestion  bool
	EnableIngestionFiltering    bool
	UsingDefaultPubnetConfig    bool
	CaptiveCoreBinaryPath       string
	RemoteCaptiveCoreURL        string
	CaptiveCoreConfigPath       string
	CaptiveCoreTomlParams       ledgerbackend.CaptiveCoreTomlParams
	CaptiveCoreToml             *ledgerbackend.CaptiveCoreToml
	CaptiveCoreStoragePath      string
	CaptiveCoreReuseStoragePath bool
	CaptiveCoreConfigUseDB      bool

	StellarCoreDatabaseURL string
	StellarCoreURL         string

	// MaxDBConnections has a priority over all 4 values below.
	MaxDBConnections            int
	HorizonDBMaxOpenConnections int
	HorizonDBMaxIdleConnections int

	SSEUpdateFrequency time.Duration
	ConnectionTimeout  time.Duration
	RateQuota          *throttled.RateQuota
	FriendbotURL       *url.URL
	LogLevel           logrus.Level
	LogFile            string

	// MaxPathLength is the maximum length of the path returned by `/paths` endpoint.
	MaxPathLength uint
	// MaxAssetsPerPathRequest is the maximum number of assets considered for `/paths/strict-send` and `/paths/strict-recieve`
	MaxAssetsPerPathRequest int
	// DisablePoolPathFinding configures horizon to run path finding without including liquidity pools
	// in the path finding search.
	DisablePoolPathFinding bool
	// DisablePathFinding configures horizon without the path finding endpoint.
	DisablePathFinding bool
	// MaxPathFindingRequests is the maximum number of path finding requests horizon will allow
	// in a 1-second period. A value of 0 disables the limit.
	MaxPathFindingRequests uint

	NetworkPassphrase string
	SentryDSN         string
	LogglyToken       string
	LogglyTag         string
	// TLSCert is a path to a certificate file to use for horizon's TLS config
	TLSCert string
	// TLSKey is the path to a private key file to use for horizon's TLS config
	TLSKey string
	// Ingest toggles whether this horizon instance should run the data ingestion subsystem.
	Ingest bool
	// CursorName is the cursor used for ingesting from stellar-core.
	// Setting multiple cursors in different Horizon instances allows multiple
	// Horizons to ingest from the same stellar-core instance without cursor
	// collisions.
	CursorName string
	// HistoryRetentionCount represents the minimum number of ledgers worth of
	// history data to retain in the horizon database. For the purposes of
	// determining a "retention duration", each ledger roughly corresponds to 10
	// seconds of real time.
	HistoryRetentionCount uint
	// StaleThreshold represents the number of ledgers a history database may be
	// out-of-date by before horizon begins to respond with an error to history
	// requests.
	StaleThreshold uint
	// SkipCursorUpdate causes the ingestor to skip reporting the "last imported
	// ledger" state to stellar-core.
	SkipCursorUpdate bool
	// IngestDisableStateVerification disables state verification
	// `System.verifyState()` when set to `true`.
	IngestDisableStateVerification bool
	// IngestEnableExtendedLogLedgerStats enables extended ledger stats in
	// logging.
	IngestEnableExtendedLogLedgerStats bool
	// ApplyMigrations will apply pending migrations to the horizon database
	// before starting the horizon service
	ApplyMigrations bool
	// CheckpointFrequency establishes how many ledgers exist between checkpoints
	CheckpointFrequency uint32
	// BehindCloudflare determines if Horizon instance is behind Cloudflare. In
	// such case http.Request.RemoteAddr will be replaced with Cloudflare header.
	BehindCloudflare bool
	// BehindAWSLoadBalancer determines if Horizon instance is behind AWS load
	// balances like ELB or ALB. In such case http.Request.RemoteAddr will be
	// replaced with the last IP in X-Forwarded-For header.
	BehindAWSLoadBalancer bool
	// RoundingSlippageFilter excludes trades from /trade_aggregations with rounding slippage >x bps
	RoundingSlippageFilter int
}

Config is the configuration for horizon. It gets populated by the app's main function and is provided to NewApp.

func Flags

func Flags() (*Config, support.ConfigOptions)

Flags returns a Config instance and a list of commandline flags which modify the Config instance

Directories

Path Synopsis
Package actions provides the infrastructure for defining and executing actions (code that is triggered in response to an client request) on horizon.
Package actions provides the infrastructure for defining and executing actions (code that is triggered in response to an client request) on horizon.
Package assets is a simple helper package to help convert to/from xdr.AssetType values
Package assets is a simple helper package to help convert to/from xdr.AssetType values
Package codes is a helper package to help convert to transaction and operation result codes to strings used in horizon.
Package codes is a helper package to help convert to transaction and operation result codes to strings used in horizon.
db2
Package db2 is the replacement for db.
Package db2 is the replacement for db.
history
Package history contains database record definitions useable for reading rows from a the history portion of horizon's database
Package history contains database record definitions useable for reading rows from a the history portion of horizon's database
Package hchi provides functions to support embedded and retrieving a request id from a go context tree
Package hchi provides functions to support embedded and retrieving a request id from a go context tree
Package ingest contains the new ingestion system for horizon.
Package ingest contains the new ingestion system for horizon.
verify
Package verify provides helpers used for verifying if the ingested data is correct.
Package verify provides helpers used for verifying if the ingested data is correct.
Package ledger provides useful utilities concerning ledgers within stellar, specifically as a central location to store a cached snapshot of the state of both horizon's and stellar-core's views of the ledger.
Package ledger provides useful utilities concerning ledgers within stellar, specifically as a central location to store a cached snapshot of the state of both horizon's and stellar-core's views of the ledger.
Package operationfeestats provides useful utilities concerning operation fee stats within stellar,specifically as a central location to store a cached snapshot of the state of network per operation fees and surge pricing.
Package operationfeestats provides useful utilities concerning operation fee stats within stellar,specifically as a central location to store a cached snapshot of the state of network per operation fees and surge pricing.
Package paths provides utilities and facilities for payment paths as needed by horizon.
Package paths provides utilities and facilities for payment paths as needed by horizon.
Package reap contains the history reaping subsystem for horizon.
Package reap contains the history reaping subsystem for horizon.
sse
This package contains the Server Sent Events implementation used by horizon.
This package contains the Server Sent Events implementation used by horizon.
Package simplepath provides an implementation of paths.
Package simplepath provides an implementation of paths.
Package test contains simple test helpers that should not have any dependencies on horizon's packages.
Package test contains simple test helpers that should not have any dependencies on horizon's packages.
db
Package db provides helpers to connect to test databases.
Package db provides helpers to connect to test databases.
transactions
Package transactions offers common infrastructure for testing Transactions
Package transactions offers common infrastructure for testing Transactions
Package txsub provides the machinery that horizon uses to submit transactions to the stellar network and track their progress.
Package txsub provides the machinery that horizon uses to submit transactions to the stellar network and track their progress.
sequence
Package sequence providers helpers to manage sequence numbers on behalf of horizon clients.
Package sequence providers helpers to manage sequence numbers on behalf of horizon clients.
Package utf8 contains utilities for working with utf8 data.
Package utf8 contains utilities for working with utf8 data.

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