options

type Options struct {

	// HTTP and Proxy Configurations
	//
	// Hosts identifies the frontend hostnames this origin should handle (virtual hosting)
	Hosts []string `toml:"hosts"`
	// OriginType describes the type of origin (e.g., 'prometheus')
	OriginType string `toml:"origin_type"`
	// OriginURL provides the base upstream URL for all proxied requests to this origin.
	// it can be as simple as http://example.com or as complex as https://example.com:8443/path/prefix
	OriginURL string `toml:"origin_url"`
	// TimeoutSecs defines how long the HTTP request will wait for a response before timing out
	TimeoutSecs int64 `toml:"timeout_secs"`
	// KeepAliveTimeoutSecs defines how long an open keep-alive HTTP connection remains idle before closing
	KeepAliveTimeoutSecs int64 `toml:"keep_alive_timeout_secs"`
	// MaxIdleConns defines maximum number of open keep-alive connections to maintain
	MaxIdleConns int `toml:"max_idle_conns"`
	// CacheName provides the name of the configured cache where the origin client will store it's cache data
	CacheName string `toml:"cache_name"`
	// CacheKeyPrefix defines the cache key prefix the origin will use when writing objects to the cache
	CacheKeyPrefix string `toml:"cache_key_prefix"`
	// HealthCheckUpstreamPath provides the URL path for the upstream health check
	HealthCheckUpstreamPath string `toml:"health_check_upstream_path"`
	// HealthCheckVerb provides the HTTP verb to use when making an upstream health check
	HealthCheckVerb string `toml:"health_check_verb"`
	// HealthCheckQuery provides the HTTP query parameters to use when making an upstream health check
	HealthCheckQuery string `toml:"health_check_query"`
	// HealthCheckHeaders provides the HTTP Headers to apply when making an upstream health check
	HealthCheckHeaders map[string]string `toml:"health_check_headers"`
	// Object Proxy Cache and Delta Proxy Cache Configurations
	// TimeseriesRetentionFactor limits the maximum the number of chronological
	// timestamps worth of data to store in cache for each query
	TimeseriesRetentionFactor int `toml:"timeseries_retention_factor"`
	// TimeseriesEvictionMethodName specifies which methodology ("oldest", "lru") is used to identify
	//timeseries to evict from a full cache object
	TimeseriesEvictionMethodName string `toml:"timeseries_eviction_method"`
	// BackfillToleranceSecs prevents values with timestamps newer than the provided
	// number of seconds from being cached this allows propagation of upstream backfill operations
	// that modify recently-served data
	BackfillToleranceSecs int64 `toml:"backfill_tolerance_secs"`
	// PathList is a list of Path Options that control the behavior of the given paths when requested
	Paths map[string]*po.Options `toml:"paths"`
	// NegativeCacheName provides the name of the Negative Cache Config to be used by this Origin
	NegativeCacheName string `toml:"negative_cache_name"`
	// TimeseriesTTLSecs specifies the cache TTL of timeseries objects
	TimeseriesTTLSecs int `toml:"timeseries_ttl_secs"`
	// TimeseriesTTLSecs specifies the cache TTL of fast forward data
	FastForwardTTLSecs int `toml:"fastforward_ttl_secs"`
	// MaxTTLSecs specifies the maximum allowed TTL for any cache object
	MaxTTLSecs int `toml:"max_ttl_secs"`
	// RevalidationFactor specifies how many times to multiply the object freshness lifetime
	// by to calculate an absolute cache TTL
	RevalidationFactor float64 `toml:"revalidation_factor"`
	// MaxObjectSizeBytes specifies the max objectsize to be accepted for any given cache object
	MaxObjectSizeBytes int `toml:"max_object_size_bytes"`
	// CompressableTypeList specifies the HTTP Object Content Types that will be compressed internally
	// when stored in the Trickster cache
	CompressableTypeList []string `toml:"compressable_types"`
	// TracingConfigName provides the name of the Tracing Config to be used by this Origin
	TracingConfigName string `toml:"tracing_name"`
	// RuleName provides the name of the rule config to be used by this origin.
	// This is only effective if the Origin Type is 'rule'
	RuleName string `toml:"rule_name"`
	// ReqRewriterName is the name of a configured Rewriter that will modify the request prior to
	// processing by the origin client
	ReqRewriterName string `toml:"req_rewriter_name"`

	// TLS is the TLS Configuration for the Frontend and Backend
	TLS *to.Options `toml:"tls"`

	// ForwardedHeaders indicates the class of 'Forwarded' header to attach to upstream requests
	ForwardedHeaders string `toml:"forwarded_headers"`

	// IsDefault indicates if this is the d.Default origin for any request not matching a configured route
	IsDefault bool `toml:"is_default"`
	// FastForwardDisable indicates whether the FastForward feature should be disabled for this origin
	FastForwardDisable bool `toml:"fast_forward_disable"`
	// PathRoutingDisabled, when true, will bypass /originName/path route registrations
	PathRoutingDisabled bool `toml:"path_routing_disabled"`
	// RequireTLS, when true, indicates this Origin Config's paths must only be registered with the TLS Router
	RequireTLS bool `toml:"require_tls"`
	// MultipartRangesDisabled, when true, indicates that if a downstream client requests multiple ranges
	// in a single request, Trickster will instead request and return a 200 OK with the full object body
	MultipartRangesDisabled bool `toml:"multipart_ranges_disabled"`
	// DearticulateUpstreamRanges, when true, indicates that when Trickster requests multiple ranges from
	// the origin, that they be requested as individual upstream requests instead of a single request that
	// expects a multipart response	// this optimizes Trickster to request as few bytes as possible when
	// fronting origins that only support single range requests
	DearticulateUpstreamRanges bool `toml:"dearticulate_upstream_ranges"`

	// Synthesized Configurations
	// These configurations are parsed versions of those defined above, and are what Trickster uses internally
	//
	// Name is the Name of the origin, taken from the Key in the Origins map[string]*OriginConfig
	Name string `toml:"-"`
	// Router is a mux.Router containing this origin's Path Routes; it is set during route registration
	Router *mux.Router `toml:"-"`
	// Timeout is the time.Duration representation of TimeoutSecs
	Timeout time.Duration `toml:"-"`
	// BackfillTolerance is the time.Duration representation of BackfillToleranceSecs
	BackfillTolerance time.Duration `toml:"-"`
	// ValueRetention is the time.Duration representation of ValueRetentionSecs
	ValueRetention time.Duration `toml:"-"`
	// Scheme is the layer 7 protocol indicator (e.g. 'http'), derived from OriginURL
	Scheme string `toml:"-"`
	// Host is the upstream hostname/IP[:port] the origin client will connect to when fetching uncached data,
	// derived from OriginURL
	Host string `toml:"-"`
	// PathPrefix provides any prefix added to the front of the requested path when constructing the upstream
	// request url, derived from OriginURL
	PathPrefix string `toml:"-"`
	// NegativeCache provides a map for the negative cache, with TTLs converted to time.Durations
	NegativeCache map[int]time.Duration `toml:"-"`
	// TimeseriesRetention when subtracted from time.Now() represents the oldest allowable timestamp in a
	// timeseries when EvictionMethod is 'oldest'
	TimeseriesRetention time.Duration `toml:"-"`
	// TimeseriesEvictionMethod is the parsed value of TimeseriesEvictionMethodName
	TimeseriesEvictionMethod evictionmethods.TimeseriesEvictionMethod `toml:"-"`
	// TimeseriesTTL is the parsed value of TimeseriesTTLSecs
	TimeseriesTTL time.Duration `toml:"-"`
	// FastForwardTTL is the parsed value of FastForwardTTL
	FastForwardTTL time.Duration `toml:"-"`
	// FastForwardPath is the paths.Options to use for upstream Fast Forward Requests
	FastForwardPath *po.Options `toml:"-"`
	// MaxTTL is the parsed value of MaxTTLSecs
	MaxTTL time.Duration `toml:"-"`
	// HTTPClient is the Client used by trickster to communicate with this origin
	HTTPClient *http.Client `toml:"-"`
	// CompressableTypes is the map version of CompressableTypeList for fast lookup
	CompressableTypes map[string]bool `toml:"-"`
	// RuleOptions is the reference to the Rule Options as indicated by RuleName
	RuleOptions *rule.Options `toml:"-"`
	// ReqRewriter is the rewriter handler as indicated by RuleName
	ReqRewriter rewriter.RewriteInstructions
}