You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: jaeger.go
    path of file: ./repos/gf/contrib/trace/jaeger
    
    the code of the file until where you have to start completion: // Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
//
// This Source Code Form is subject to the terms of the MIT License.
// If a copy of the MIT was not distributed with this file,
// You can obtain one at https://github.com/gogf/gf.

// Package jaeger provides OpenTelemetry provider using jaeger.
//
// Deprecated:
// Please use `github.com/gogf/gf/contrib/trace/otlphttp/v2` instead.
// As dependent package `go.opentelemetry.io/otel/exporters/jaeger` is deprecated in otel,
// this package will be never be maintained from goframe v2.6.0.
package jaeger

import (
	"strings"

	"go.opentelemetry.io/otel"
	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/exporters/jaeger"
	"go.opentelemetry.io/otel/sdk/resource"
	"go.opentelemetry.io/otel/sdk/trace"
	semconv "go.opentelemetry.io/otel/semconv/v1.4.0"

	"github.com/gogf/gf/v2/errors/gcode"
	"github.com/gogf/gf/v2/errors/gerror"
	"github.com/gogf/gf/v2/net/gipv4"
	"github.com/gogf/gf/v2/text/gregex"
)

const (
	tracerHostnameTagKey = "hostname"
)

// Init initializes and registers jaeger to global TracerProvider.
//
// The output parameter `flush` is used for waiting exported trace spans to be uploaded,
// which is useful if your program is ending, and you do not want to lose recent spans.
func Init(serviceName, endpoint string) (*trace.TracerProvider, error) {
	// Create the Jaeger exporter
	var endpointOption jaeger
    
func Init(serviceName, endpoint string) (*trace.TracerProvider, error) {
	// Create the Jaeger exporter
	var endpointOption jaeger.EndpointOption
	if strings.HasPrefix(endpoint, "http") {
		// HTTP.
		endpointOption = jaeger.WithCollectorEndpoint(jaeger.WithEndpoint(endpoint))
	} else {
		// UDP.
		match, err := gregex.MatchString(`(.+):(\d+)`, endpoint)
		if err != nil {
			return nil, err
		}
		if len(match) < 3 {
			return nil, gerror.NewCodef(
				gcode.CodeInvalidParameter, `invalid endpoint "%s"`, endpoint,
			)
		}
		var (
			host = match[1]
			port = match[2]
		)
		endpointOption = jaeger.WithAgentEndpoint(
			jaeger.WithAgentHost(host), jaeger.WithAgentPort(port),
		)
	}
	// Try retrieving host ip for tracing info.
	var (
		hostIp               = "NoHostIpFound"
		intranetIPArray, err = gipv4.GetIntranetIpArray()
	)
	if err != nil {
		return nil, err
	}
	if len(intranetIPArray) == 0 {
		if intranetIPArray, err = gipv4.GetIpArray(); err != nil {
			return nil, err
		}
	}
	if len(intranetIPArray) > 0 {
		hostIp = intranetIPArray[0]
	}

	exp, err := jaeger.New(endpointOption)
	if err != nil {
		return nil, err
	}
	tp := trace.NewTracerProvider(
		// Always be sure to batch in production.
		trace.WithBatcher(exp),
		// Record information about this application in a Resource.
		trace.WithResource(resource.NewWithAttributes(
			semconv.SchemaURL,
			semconv.ServiceNameKey.String(serviceName),
			semconv.HostNameKey.String(hostIp),
			attribute.String(tracerHostnameTagKey, hostIp),
		)),
	)
	// Register our TracerProvider as the global, so any imported
	// instrumentation in the future will default to using it.
	otel.SetTracerProvider(tp)
	return tp, nil
}