(front) Autocomplete search on dashboard with Datalist

Create Elasticsearch service to search suggestions

Send to page when choose a suggestion - bad way
It's impossible to use Object with datalist
So it's impossible to distinguish an album from an artist if they have
the same name

dashboard/src/app/app.module.ts

@@ -1,6 +1,7 @@
 import { NgModule } from '@angular/core';
 import { BrowserModule } from '@angular/platform-browser';
 import { HttpClientModule } from '@angular/common/http';
+import { FormsModule } from '@angular/forms'; // <-- NgModel lives here
 
 import { AppComponent } from './app.component';
 import { DashboardComponent } from './dashboard/dashboard.component';
@@ -26,6 +27,7 @@ import { AlbumsComponent } from './albums/albums.component';
   imports: [
     BrowserModule,
     HttpClientModule,
+    FormsModule,
     AppRoutingModule
   ],
   declarations: [

dashboard/src/app/dashboard/dashboard.component.html

@@ -77,6 +77,25 @@
     </div>
 </div>
 
+<form class="navbar-form">
+    <div class="form-group" style="display:inline;">
+        <div class="input-group" style="display:table;">
+            <span class="input-group-addon" style="width:1%;">
+                <span class="glyphicon glyphicon-search"></span>
+            </span>
+            <input class="form-control" type="text" name="search" placeholder="Search Here" autocomplete="off" autofocus="autofocus"
+                id="searchSuggest"
+                list="dynmicUserIds"
+                [(ngModel)]="searchTerm"
+                (keyup)="onSearchChange()"
+                (change)="onSearchSelected($event)">
+                <datalist id="dynmicUserIds">
+                   <option *ngFor="let item of suggested" [value]="item.name" [label]="item.type" [id]="item">{{item}}</option>
+                </datalist>
+        </div>
+    </div>
+</form>
+
 <div class="col-md-12">
     <table class="table table-striped">
         <thead>

dashboard/src/app/dashboard/dashboard.component.ts

@@ -1,10 +1,12 @@
 import { Component, OnInit } from '@angular/core';
+import { Router } from '@angular/router';
 
 import { ElsService } from './../els.service';
 import { Song } from './../model/song';
 import { Bucket } from './../model/bucket';
 import { Album } from './../model/album';
 import { Artist } from './../model/artist';
+import { Suggested } from '../model/suggested';
 
 @Component({
   selector: 'app-dashboard',
@@ -30,7 +32,10 @@ export class DashboardComponent implements OnInit {
   lastAddedAlbums: Bucket[] = [];
   albumArtists = [];
 
-  constructor(private elsService: ElsService) { }
+  searchTerm = ''
+  suggested : Suggested[] = []
+
+  constructor(private elsService: ElsService, private route: Router) { }
 
   ngOnInit(): void {
     this.elsService.getTime().then(result => {
@@ -113,4 +118,19 @@ export class DashboardComponent implements OnInit {
       }
     });
   }
+
+  onSearchChange() {
+    this.elsService.getSuggest(this.searchTerm).subscribe(result => this.suggested = result);
+  }
+
+  onSearchSelected($event) {
+    let selected = $event.target.value
+    // FIXME Not possible to get good element (just value)
+    // Need to use a plugin to do this correctly
+    this.suggested.forEach(element => {
+      if (element.name == selected) {
+        this.route.navigate(['/' + element.type + '/' + element.name])
+      }
+    });
+  }
 }

dashboard/src/app/els.service.ts

@@ -8,6 +8,7 @@ import { Song } from './model/song';
 import { Album } from './model/album';
 import { Artist } from './model/artist';
 import { Bucket } from './model/bucket';
+import { Suggested } from './model/suggested';
 
 @Injectable()
 export class ElsService {
@@ -15,6 +16,7 @@ export class ElsService {
   public static readonly SONG_INDEX_NAME = '/itunes-songs';
   public static readonly ARTIST_INDEX_NAME = '/itunes-artists';
   public static readonly ALBUM_INDEX_NAME = '/itunes-albums';
+  public static readonly SUGGEST_INDEX_NAME = '/itunes-suggest';
 
   protected static readonly ACTION_SEARCH = '/_search';
   protected static readonly ACTION_COUNT = '/_count';
@@ -381,6 +383,34 @@ export class ElsService {
     );
   }
 
+  getSuggest(text: string): Observable<Suggested[]> {
+    console.log('search sugget: ' + text);
+    return this.http
+    .post<any>(this.elsUrl + ElsService.SUGGEST_INDEX_NAME + ElsService.ACTION_SEARCH,
+          JSON.stringify({
+            '_source': ['album', 'artist'],
+            'suggest': {
+                'album-suggest': {
+                    'prefix': text,
+                    'completion': {
+                        'field': 'album_suggest'
+                    }
+                },
+                'artist-suggest': {
+                    'prefix': text,
+                    'completion': {
+                        'field': 'artist_suggest'
+                    }
+                }
+            }
+        }), {headers: this.headers})
+    .pipe(
+      map(res => this.responseSuggesterToSuggested(res, 'album-suggest', 'artist-suggest')),
+      catchError(error => this.handleError(error, 'getSuggest(' + text + ')'))
+    );
+
+  }
+
   /** Process a result to return just one result.
    * Used to get an album or an artist.
    * Take a name to put in console output if no result or more than one result.
@@ -462,6 +492,20 @@ export class ElsService {
     return result;
   }
 
+  protected responseSuggesterToSuggested(res: any, ...suggestName: string[]): Suggested[] {
+    const result: Array<Suggested> = []
+    suggestName.forEach(sname => {
+      res['suggest'][sname][0]['options'].forEach(option => {
+        let suggest = new Suggested()
+        // TODO If more than one key, raise exception
+        suggest.type = String(Object.keys(option['_source']))
+        suggest.name = option['_source'][suggest.type]
+        result.push(suggest)
+      });
+    });
+    return result;
+  }
+
   protected handleError(error: any, origin: string): Promise<any> {
     console.error('An error occurred!');
     console.error('Origin function: ', origin);

dashboard/src/app/model/suggested.ts

@@ -0,0 +1,8 @@
+export class Suggested {
+    name: string;
+    type: string;
+
+    public toString() : string {
+        return `${this.name} (${this.type})`;
+    }
+}

suggester.es

@@ -0,0 +1,137 @@
+DELETE itunes-suggest
+
+PUT /itunes-suggest
+{
+    "settings": {
+        "analysis": {
+            "filter": {
+                "french_stop": {
+                    "type": "stop",
+                    "stopwords": "_french_"
+                },
+                "english_stop": {
+                    "type": "stop",
+                    "stopwords": "_english_"
+                }
+            },
+            "analyzer": {
+                "names": {
+                    "tokenizer": "standard",
+                    "filter": [
+                        "lowercase",
+                        "asciifolding",
+                        "french_stop",
+                        "english_stop"
+                    ]
+                }
+            }
+        }
+    },
+    "mappings": {
+        "properties": {
+            "artist_suggest": {
+                "type": "completion",
+                "search_analyzer": "names"
+            },
+            "artist": {
+                "type": "keyword"
+            },
+            "album_suggest": {
+                "type": "completion",
+                "search_analyzer": "names"
+            },
+            "album": {
+                "type": "keyword"
+            }
+        }
+    }
+}
+
+// Also possible to specify analyze for ingesting => https://stackoverflow.com/questions/48304499/elasticsearch-completion-suggester-not-working-with-whitespace-analyzer
+
+// Problem with word EP, SP
+
+GET itunes-suggest/_analyze
+{
+    "analyzer": "names",
+    "text": "the servent"
+}
+
+GET itunes-suggest/_search
+
+POST itunes-suggest/_search
+{
+    "_source" : "artist",
+    "suggest": {
+        "name-suggest": {
+            "prefix": "sou",
+            "completion": {
+                "field": "artist_suggest"
+            }
+        }
+    }
+}
+
+POST itunes-suggest/_search
+{
+    "_source" : "album",
+    "suggest": {
+        "name-suggest": {
+            "prefix": "new",
+            "completion": {
+                "field": "album_suggest",
+                "size": 20
+            }
+        }
+    }
+}
+
+POST itunes-suggest/_search
+{
+    "_source": ["album", "artist"],
+    "suggest": {
+        "alb-suggest": {
+            "prefix": "sou",
+            "completion": {
+                "field": "album_suggest"
+            }
+        },
+        "ar-suggest": {
+            "prefix": "sou",
+            "completion": {
+                "field": "artist_suggest"
+            }
+        }
+    }
+}
+
+POST itunes-suggest/_search
+{
+    "_source": ["album", "artist"],
+    "suggest": {
+        "alb-suggest": {
+            "prefix": "Francois",
+            "completion": {
+                "field": "album_suggest"
+            }
+        },
+        "ar-suggest": {
+            "prefix": "Francois",
+            "completion": {
+                "field": "artist_suggest"
+            }
+        }
+    }
+}
+
+POST itunes-suggest/_search
+{
+    "suggest": {
+        "ar-suggest": {
+            "prefix": "Femme",
+            "completion": {
+                "field": "artist_suggest"
+            }
+        }
+    }
+}

suggester.py

@@ -0,0 +1,83 @@
+import requests
+import json
+import sys
+
+ELS_URL ='http://localhost:9200'
+INDEX = 'itunes-suggest'
+
+class NoGoodDataException(Exception):
+    def __init__(self, message):
+        super().__init__(message)
+
+def get_tokens(data: str) -> list:
+    if not data:
+        return []
+    query = {
+        "analyzer": "names",
+        "text" : data
+    }
+
+    url = '{}/{}/_analyze'.format(ELS_URL, INDEX)
+    r = requests.get(url, json=query)
+
+    if not 'tokens' in r.json():
+        print('ERROR: Not tokens in result')
+        print('Input: ' + str(data))
+        print('Request: ' + str(r.json()))
+        raise NoGoodDataException('Data is not correct to get tokens')
+    return [t['token'] for t in r.json()['tokens']]
+
+def post_document(name: str, input: list, field_name: str) -> bool:
+    suggest_name = field_name + '_suggest'
+    element = {
+        field_name: name,
+        suggest_name: input
+    }
+
+    # Filter empty keys
+    # element = {k: v for k, v in element.items() if v}
+
+    url = '{}/{}/_doc'.format(ELS_URL, INDEX)
+    resp = requests.post(url, json=element)
+    if resp.status_code != 201:
+        print('ELS Response KO')
+        print(resp.status_code)
+        print(resp.text)
+        return
+
+    el_id = resp.json()['_id']
+    # print('Post_element - Element created: ' + el_id)
+    return el_id
+
+def process_file(file_name: str, field_name: str) -> int:
+    print('Process file: ' + file_name)
+    with open(file_name, 'r') as o_file:
+            lines = o_file.readlines()
+
+    count = 0
+    i = 0
+    for line in lines:
+        i += 1
+        sys.stdout.write(str(int((i/len(lines))*100)) + '%')
+        sys.stdout.flush()
+        sys.stdout.write("\b" * (40+1)) # return to start of line, after '['
+        data = json.loads(line)
+        if "Artist" in data:
+            try :
+                input = get_tokens(data[field_name])
+                post_document(name=data[field_name], input=input, field_name=field_name.lower())
+                count += 1
+            except NoGoodDataException:
+                print('ERROR WITH DATA')
+                print(str(data))
+    print('File processed\n')
+
+    return count
+
+
+if __name__ == '__main__':
+    # Using readlines()
+    count = 0
+    count += process_file('/home/budd/workspace/iTunes/es-albums.json', 'Album')
+    count += process_file('/home/budd/workspace/iTunes/es-artists.json', 'Artist')
+    print('Created documents: ' + str(count))