Merge "Refactor for more efficient job handling"
[nonrtric.git] / dmaap-mediator-producer / main.go
1 // -
2 //   ========================LICENSE_START=================================
3 //   O-RAN-SC
4 //   %%
5 //   Copyright (C) 2021: Nordix Foundation
6 //   %%
7 //   Licensed under the Apache License, Version 2.0 (the "License");
8 //   you may not use this file except in compliance with the License.
9 //   You may obtain a copy of the License at
10 //
11 //        http://www.apache.org/licenses/LICENSE-2.0
12 //
13 //   Unless required by applicable law or agreed to in writing, software
14 //   distributed under the License is distributed on an "AS IS" BASIS,
15 //   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 //   See the License for the specific language governing permissions and
17 //   limitations under the License.
18 //   ========================LICENSE_END===================================
19 //
20
21 package main
22
23 import (
24         "crypto/tls"
25         "fmt"
26         "net/http"
27         "time"
28
29         "github.com/hashicorp/go-retryablehttp"
30         log "github.com/sirupsen/logrus"
31         "oransc.org/nonrtric/dmaapmediatorproducer/internal/config"
32         "oransc.org/nonrtric/dmaapmediatorproducer/internal/jobs"
33         "oransc.org/nonrtric/dmaapmediatorproducer/internal/restclient"
34         "oransc.org/nonrtric/dmaapmediatorproducer/internal/server"
35 )
36
37 var configuration *config.Config
38
39 func init() {
40         configuration = config.New()
41 }
42
43 func main() {
44         log.SetLevel(configuration.LogLevel)
45         log.Debug("Initializing DMaaP Mediator Producer")
46         if err := validateConfiguration(configuration); err != nil {
47                 log.Fatalf("Stopping producer due to error: %v", err)
48         }
49         callbackAddress := fmt.Sprintf("%v:%v", configuration.InfoProducerHost, configuration.InfoProducerPort)
50
51         var retryClient restclient.HTTPClient
52         if cert, err := createClientCertificate(); err == nil {
53                 retryClient = createRetryClient(cert)
54         } else {
55                 log.Fatalf("Stopping producer due to error: %v", err)
56         }
57
58         jobsManager := jobs.NewJobsManagerImpl("configs/type_config.json", retryClient, configuration.DMaaPMRAddress, &http.Client{
59                 Timeout: time.Second * 5,
60         })
61         if err := registerTypesAndProducer(jobsManager, configuration.InfoCoordinatorAddress, callbackAddress, retryClient); err != nil {
62                 log.Fatalf("Stopping producer due to: %v", err)
63         }
64         jobsManager.StartJobs()
65
66         log.Debug("Starting DMaaP Mediator Producer")
67         go func() {
68                 log.Debugf("Starting callback server at port %v", configuration.InfoProducerPort)
69                 r := server.NewRouter(jobsManager)
70                 log.Fatalf("Server stopped: %v", http.ListenAndServeTLS(fmt.Sprintf(":%v", configuration.InfoProducerPort), configuration.ProducerCertPath, configuration.ProducerKeyPath, r))
71         }()
72
73         keepProducerAlive()
74 }
75
76 func validateConfiguration(configuration *config.Config) error {
77         if configuration.InfoProducerHost == "" {
78                 return fmt.Errorf("missing INFO_PRODUCER_HOST")
79         }
80         if configuration.ProducerCertPath == "" || configuration.ProducerKeyPath == "" {
81                 return fmt.Errorf("missing PRODUCER_CERT and/or PRODUCER_KEY")
82         }
83         return nil
84 }
85
86 func createClientCertificate() (*tls.Certificate, error) {
87         if cert, err := tls.LoadX509KeyPair(configuration.ProducerCertPath, configuration.ProducerKeyPath); err == nil {
88                 return &cert, nil
89         } else {
90                 return nil, fmt.Errorf("cannot create x509 keypair from cert file %s and key file %s due to: %v", configuration.ProducerCertPath, configuration.ProducerKeyPath, err)
91         }
92 }
93
94 func createRetryClient(cert *tls.Certificate) *http.Client {
95         rawRetryClient := retryablehttp.NewClient()
96         rawRetryClient.RetryWaitMax = time.Minute
97         rawRetryClient.RetryMax = int(^uint(0) >> 1)
98         rawRetryClient.HTTPClient.Transport = &http.Transport{
99                 TLSClientConfig: &tls.Config{
100                         Certificates: []tls.Certificate{
101                                 *cert,
102                         },
103                         InsecureSkipVerify: true,
104                 },
105         }
106
107         return rawRetryClient.StandardClient()
108 }
109
110 func registerTypesAndProducer(jobHandler jobs.JobTypesManager, infoCoordinatorAddress string, callbackAddress string, client restclient.HTTPClient) error {
111         registrator := config.NewRegistratorImpl(infoCoordinatorAddress, client)
112         if types, err := jobHandler.LoadTypesFromConfiguration(); err == nil {
113                 if regErr := registrator.RegisterTypes(types); regErr != nil {
114                         return fmt.Errorf("unable to register all types due to: %v", regErr)
115                 }
116         } else {
117                 return fmt.Errorf("unable to get types to register due to: %v", err)
118         }
119         producer := config.ProducerRegistrationInfo{
120                 InfoProducerSupervisionCallbackUrl: callbackAddress + server.StatusPath,
121                 SupportedInfoTypes:                 jobHandler.GetSupportedTypes(),
122                 InfoJobCallbackUrl:                 callbackAddress + server.AddJobPath,
123         }
124         if err := registrator.RegisterProducer("DMaaP_Mediator_Producer", &producer); err != nil {
125                 return fmt.Errorf("unable to register producer due to: %v", err)
126         }
127         return nil
128 }
129
130 func keepProducerAlive() {
131         forever := make(chan int)
132         <-forever
133 }