/**
 * Copyright 2018, OpenCensus Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/// <reference types="node" />
import * as loggerTypes from '../../common/types';
import * as configTypes from '../config/types';
import { Propagation } from '../propagation/types';
import * as samplerTypes from '../sampler/types';
/** Default type for functions */
export declare type Func<T> = (...args: any[]) => T;
/** Maps a label to a string, number or boolean. */
export interface Attributes {
    [attributeKey: string]: string | number | boolean;
}
/**
 * The status of a Span by providing a standard CanonicalCode in conjunction
 * with an optional descriptive message.
 */
export interface Status {
    /** The canonical code of this message. */
    code: CanonicalCode;
    /** A developer-facing error message. */
    message?: string;
}
/** An enumeration of canonical status codes. */
export declare enum CanonicalCode {
    /**
     * Not an error; returned on success
     */
    OK = 0,
    /**
     * The operation was cancelled (typically by the caller).
     */
    CANCELLED = 1,
    /**
     * Unknown error.  An example of where this error may be returned is
     * if a status value received from another address space belongs to
     * an error-space that is not known in this address space.  Also
     * errors raised by APIs that do not return enough error information
     * may be converted to this error.
     */
    UNKNOWN = 2,
    /**
     * Client specified an invalid argument.  Note that this differs
     * from FAILED_PRECONDITION.  INVALID_ARGUMENT indicates arguments
     * that are problematic regardless of the state of the system
     * (e.g., a malformed file name).
     */
    INVALID_ARGUMENT = 3,
    /**
     * Deadline expired before operation could complete.  For operations
     * that change the state of the system, this error may be returned
     * even if the operation has completed successfully.  For example, a
     * successful response from a server could have been delayed long
     * enough for the deadline to expire.
     */
    DEADLINE_EXCEEDED = 4,
    /**
     * Some requested entity (e.g., file or directory) was not found.
     */
    NOT_FOUND = 5,
    /**
     * Some entity that we attempted to create (e.g., file or directory)
     * already exists.
     */
    ALREADY_EXISTS = 6,
    /**
     * The caller does not have permission to execute the specified
     * operation.  PERMISSION_DENIED must not be used for rejections
     * caused by exhausting some resource (use RESOURCE_EXHAUSTED
     * instead for those errors).  PERMISSION_DENIED must not be
     * used if the caller can not be identified (use UNAUTHENTICATED
     * instead for those errors).
     */
    PERMISSION_DENIED = 7,
    /**
     * Some resource has been exhausted, perhaps a per-user quota, or
     * perhaps the entire file system is out of space.
     */
    RESOURCE_EXHAUSTED = 8,
    /**
     * Operation was rejected because the system is not in a state
     * required for the operation's execution.  For example, directory
     * to be deleted may be non-empty, an rmdir operation is applied to
     * a non-directory, etc.
     *
     * A litmus test that may help a service implementor in deciding
     * between FAILED_PRECONDITION, ABORTED, and UNAVAILABLE:
     *
     *  - Use UNAVAILABLE if the client can retry just the failing call.
     *  - Use ABORTED if the client should retry at a higher-level
     *    (e.g., restarting a read-modify-write sequence).
     *  - Use FAILED_PRECONDITION if the client should not retry until
     *    the system state has been explicitly fixed.  E.g., if an "rmdir"
     *    fails because the directory is non-empty, FAILED_PRECONDITION
     *    should be returned since the client should not retry unless
     *    they have first fixed up the directory by deleting files from it.
     *  - Use FAILED_PRECONDITION if the client performs conditional
     *    REST Get/Update/Delete on a resource and the resource on the
     *    server does not match the condition. E.g., conflicting
     *    read-modify-write on the same resource.
     */
    FAILED_PRECONDITION = 9,
    /**
     * The operation was aborted, typically due to a concurrency issue
     * like sequencer check failures, transaction aborts, etc.
     *
     * See litmus test above for deciding between FAILED_PRECONDITION,
     * ABORTED, and UNAVAILABLE.
     */
    ABORTED = 10,
    /**
     * Operation was attempted past the valid range.  E.g., seeking or
     * reading past end of file.
     *
     * Unlike INVALID_ARGUMENT, this error indicates a problem that may
     * be fixed if the system state changes. For example, a 32-bit file
     * system will generate INVALID_ARGUMENT if asked to read at an
     * offset that is not in the range [0,2^32-1], but it will generate
     * OUT_OF_RANGE if asked to read from an offset past the current
     * file size.
     *
     * There is a fair bit of overlap between FAILED_PRECONDITION and
     * OUT_OF_RANGE.  We recommend using OUT_OF_RANGE (the more specific
     * error) when it applies so that callers who are iterating through
     * a space can easily look for an OUT_OF_RANGE error to detect when
     * they are done.
     */
    OUT_OF_RANGE = 11,
    /**
     * Operation is not implemented or not supported/enabled in this service.
     */
    UNIMPLEMENTED = 12,
    /**
     * Internal errors.  Means some invariants expected by underlying
     * system has been broken.  If you see one of these errors,
     * something is very broken.
     */
    INTERNAL = 13,
    /**
     * The service is currently unavailable.  This is a most likely a
     * transient condition and may be corrected by retrying with
     * a backoff.
     *
     * See litmus test above for deciding between FAILED_PRECONDITION,
     * ABORTED, and UNAVAILABLE.
     */
    UNAVAILABLE = 14,
    /**
     * Unrecoverable data loss or corruption.
     */
    DATA_LOSS = 15,
    /**
     * The request does not have valid authentication credentials for the
     * operation.
     */
    UNAUTHENTICATED = 16
}
/** A text annotation with a set of attributes. */
export interface Annotation {
    /** A user-supplied message describing the event. */
    description: string;
    /** A timestamp for the event event. */
    timestamp: number;
    /** A set of attributes on the annotation. */
    attributes: Attributes;
}
/** An event describing a message sent/received between Spans. */
export interface MessageEvent {
    /** A timestamp for the event. */
    timestamp: number;
    /** Indicates whether the message was sent or received. */
    type: MessageEventType;
    /**
     * An identifier for the MessageEvent's message that can be used to match
     * SENT and RECEIVED MessageEvents. Message event ids should start with 1 for
     * both sent and received messages and increment by 1 for each message
     * sent/received.
     */
    id: number;
    /** The number of uncompressed bytes sent or received. */
    uncompressedSize?: number;
    /**
     * The number of compressed bytes sent or received. If zero or
     * undefined, assumed to be the same size as uncompressed.
     */
    compressedSize?: number;
}
/**
 * A pointer from the current span to another span in the same trace or in a
 * different trace.
 */
export interface Link {
    /** The trace ID for a trace within a project. */
    traceId: string;
    /** The span ID for a span within a trace. */
    spanId: string;
    /** The relationship of the current span relative to the linked. */
    type: LinkType;
    /** A set of attributes on the link. */
    attributes: Attributes;
}
/** Defines the trace options */
export interface TraceOptions {
    /** Root span name */
    name: string;
    /** Trace context */
    spanContext?: SpanContext;
    /** Span kind */
    kind?: SpanKind;
    /** Determines the sampling rate. Ranges from 0.0 to 1.0 */
    samplingRate?: number;
}
/** Defines the span options */
export interface SpanOptions {
    /** Span name */
    name: string;
    /** Span kind */
    kind?: SpanKind;
    /** The new span's parent */
    childOf?: Span;
}
export declare type TraceState = string;
/** Defines the span context */
export interface SpanContext {
    /** Trace ID */
    traceId: string;
    /** Span ID */
    spanId: string;
    /** Options */
    options?: number;
    /** TraceState */
    traceState?: TraceState;
}
/** Defines an end span event listener */
export interface SpanEventListener {
    /** Happens when a span is started */
    onStartSpan(span: Span): void;
    /** Happens when a span is ended */
    onEndSpan(span: Span): void;
}
/** An event describing a message sent/received between Spans. */
export declare enum MessageEventType {
    /** Unknown event type. */
    UNSPECIFIED = 0,
    /** Indicates a sent message. */
    SENT = 1,
    /** Indicates a received message. */
    RECEIVED = 2
}
/**
 * Type of span. Can be used to specify additional relationships between spans
 * in addition to a parent/child relationship.
 */
export declare enum SpanKind {
    /** Unspecified */
    UNSPECIFIED = 0,
    /**
     * Indicates that the span covers server-side handling of an RPC or other
     * remote network request.
     */
    SERVER = 1,
    /**
     * Indicates that the span covers the client-side wrapper around an RPC or
     * other remote request.
     */
    CLIENT = 2
}
/**
 * Type of link. The relationship of the current span relative to the linked
 * span.
 */
export declare enum LinkType {
    /**
     * The relationship of the two spans is unknown, or known but other
     * than parent-child.
     */
    UNSPECIFIED = 0,
    /** The linked span is a child of the current span. */
    CHILD_LINKED_SPAN = 1,
    /** The linked span is a parent of the current span. */
    PARENT_LINKED_SPAN = 2
}
/** Interface for Span */
export interface Span {
    /** The Span ID of this span */
    readonly id: string;
    /** A tracer object, exposong the tracer makes it possible to create child
     * spans from the span instance like. span.tracer.startChildSpan()
     */
    tracer: TracerBase;
    /** If the parent span is in another process. */
    remoteParent: boolean;
    /** The span ID of this span's parent. If it's a root span, must be empty */
    parentSpanId: string;
    /** The resource name of the span */
    name: string;
    /** Kind of span. */
    kind: SpanKind;
    /** An object to log information to */
    logger: loggerTypes.Logger;
    /** A final status for this span */
    status: Status;
    /** A set of attributes, each in the format [KEY]:[VALUE] */
    attributes: Attributes;
    /** A text annotation with a set of attributes. */
    annotations: Annotation[];
    /** An event describing a message sent/received between Spans. */
    messageEvents: MessageEvent[];
    /** Pointers from the current span to another span */
    links: Link[];
    /** Recursively gets the descendant spans. */
    allDescendants(): Span[];
    /** The list of immediate child spans. */
    spans: Span[];
    /** The number of direct children */
    numberOfChildren: number;
    /** Trace id asscoiated with span. */
    readonly traceId: string;
    /** Trace state associated with span */
    readonly traceState?: TraceState;
    /** Indicates if span was started. */
    readonly started: boolean;
    /** Indicates if span was ended. */
    readonly ended: boolean;
    /**
     * Gives a timestap that indicates the span's start time in RFC3339 UTC
     * "Zulu" format.
     */
    readonly startTime: Date;
    /**
     * Gives a timestap that indicates the span's end time in RFC3339 UTC
     * "Zulu" format.
     */
    readonly endTime: Date;
    /**
     * Gives a timestap that indicates the span's duration in RFC3339 UTC
     * "Zulu" format.
     */
    readonly duration: number;
    /** Gives the TraceContext of the span. */
    readonly spanContext: SpanContext;
    /** Trace Parameters */
    activeTraceParams: configTypes.TraceParams;
    /** The number of dropped attributes. */
    droppedAttributesCount: number;
    /** The number of dropped links. */
    droppedLinksCount: number;
    /** The number of dropped annotations. */
    droppedAnnotationsCount: number;
    /** The number of dropped message events. */
    droppedMessageEventsCount: number;
    /**
     * Adds an atribute to the span.
     * @param key Describes the value added.
     * @param value The result of an operation.
     */
    addAttribute(key: string, value: string | number | boolean | object): void;
    /**
     * Adds an annotation to the span.
     * @param description Describes the event.
     * @param attributes A set of attributes on the annotation.
     * @param timestamp A timestamp for this event.
     */
    addAnnotation(description: string, attributes?: Attributes, timestamp?: number): void;
    /**
     * Adds a link to the span.
     * @param traceId The trace ID for a trace within a project.
     * @param spanId The span ID for a span within a trace.
     * @param type The relationship of the current span relative to the linked.
     * @param attributes A set of attributes on the link.
     */
    addLink(traceId: string, spanId: string, type: LinkType, attributes?: Attributes): void;
    /**
     * Adds a message event to the span.
     * @param type The type of message event.
     * @param id An identifier for the message event.
     * @param timestamp A timestamp for this event.
     * @param uncompressedSize The number of uncompressed bytes sent or received.
     * @param compressedSize The number of compressed bytes sent or received. If
     *     zero or undefined, assumed to be the same size as uncompressed.
     */
    addMessageEvent(type: MessageEventType, id: number, timestamp?: number, uncompressedSize?: number, compressedSize?: number): void;
    /**
     * Sets a status to the span.
     * @param code The canonical status code.
     * @param message optional A developer-facing error message.
     */
    setStatus(code: CanonicalCode, message?: string): void;
    /** Starts a span. */
    start(): void;
    /** Ends a span and all of its children, recursively. */
    end(): void;
    /** Forces to end a span. */
    truncate(): void;
    /** Starts a new Span instance as a child of this instance */
    startChildSpan(options?: SpanOptions): Span;
    /** Returns whether a span is root or not. */
    isRootSpan(): boolean;
}
/** Interface for TracerBase */
export interface TracerBase extends SpanEventListener {
    /** A sampler that will decide if the span will be sampled or not */
    sampler: samplerTypes.Sampler;
    /** A configuration for starting the tracer */
    logger: loggerTypes.Logger;
    /** A configuration object for trace parameters */
    activeTraceParams: configTypes.TraceParams;
    /** A propagation instance */
    readonly propagation: Propagation;
    /** Get the eventListeners from tracer instance */
    readonly eventListeners: SpanEventListener[];
    /** Get the active status from tracer instance */
    readonly active: boolean;
    /**
     * Start a tracer instance
     * @param config Configuration for tracer instace
     * @returns A tracer instance started
     */
    start(config: configTypes.TracerConfig): this;
    /** Stop the tracer instance */
    stop(): this;
    /**
     * Start a new RootSpan to currentRootSpan
     * @param options Options for tracer instance
     * @param fn Callback function
     * @returns The callback return
     */
    startRootSpan<T>(options: TraceOptions, fn: (root: Span) => T): T;
    /**
     * Register a OnEndSpanEventListener on the tracer instance
     * @param listener An OnEndSpanEventListener instance
     */
    registerSpanEventListener(listener: SpanEventListener): void;
    /**
     * Unregisters an end span event listener.
     * @param listener The listener to unregister.
     */
    unregisterSpanEventListener(listener: SpanEventListener): void;
    /**
     * Start a new Span instance to the currentRootSpan
     * @param [options] A TraceOptions object to start a root span.
     * @returns The new Span instance started
     */
    startChildSpan(options?: SpanOptions): Span;
    /** Sets the current root span. */
    setCurrentRootSpan(root: Span): void;
}
/** Interface for Tracer */
export interface Tracer extends TracerBase {
    /** Get and set the currentRootSpan to tracer instance */
    currentRootSpan: Span;
    /** Clear the currentRootSpan from tracer instance */
    clearCurrentTrace(): void;
    /**
     * Binds the trace context to the given function.
     * This is necessary in order to create child spans correctly in functions
     * that are called asynchronously (for example, in a network response
     * handler).
     * @param fn A function to which to bind the trace context.
     */
    wrap<T>(fn: Func<T>): Func<T>;
    /**
     * Binds the trace context to the given event emitter.
     * This is necessary in order to create child spans correctly in event
     * handlers.
     * @param emitter An event emitter whose handlers should have
     *     the trace context binded to them.
     */
    wrapEmitter(emitter: NodeJS.EventEmitter): void;
}