read database info from file

.gitignore

@@ -7,4 +7,5 @@ tmp/
 *~
 .*~
 ENV.database
+databaseInfo.json
 

DbService.cs

@@ -1,19 +1,65 @@
 #pragma warning disable 1591
 
 using System;
+using System.IO;
 using System.Collections.Generic;
 using System.Runtime.Serialization;
 using System.Threading.Tasks;
 using Microsoft.Extensions.Configuration;
 using MySqlConnector;
+using Newtonsoft.Json;
 
 // make sure to adjust the prefix with the PACKAGE_NAME from ENV
 using com.krohne.genericdatabaseapiservice.Models;
 
 // make sure to adjust the prefix with the PACKAGE_NAME from ENV
 namespace com.krohne.genericdatabaseapiservice.Services {
+    public class DbInfoObject {
+        public DbInfoObject(string host, string user, string password, string name) {
+            Host = host;
+            User = user;
+            Password = password;
+            Name = name;
+        }
+
+        public string Host { get; set; }
+        public string User { get; set; }
+        public string Password { get; set; }
+        public string Name { get; set; }
+    }
+
+    public interface IDbInfoService {
+        DbInfoObject GetInfoByTag(string tag);
+        string GetInfoStringByTag(string tag);
+    }
+
+    public class DbInfoService : IDbInfoService {
+        private readonly IConfiguration Configuration;
+        private Dictionary<string, DbInfoObject> DbInfos;
+
+        public DbInfoService(IConfiguration configuration) {
+            Configuration = configuration;
+            Console.WriteLine("Database Infofile: {0}", Configuration["Database:InfoFile"]);
+            DbInfos = JsonConvert.DeserializeObject<Dictionary<string, DbInfoObject>>(File.ReadAllText(Configuration["Database:InfoFile"]));
+        }
+
+        public DbInfoObject GetInfoByTag(string tag) {
+            return DbInfos[tag];
+        }
+
+        public string GetInfoStringByTag(string tag) {
+            return String.Format(
+                "Server={0};User ID={1};Password={2};Database={3}",
+                DbInfos[tag].Host,
+                DbInfos[tag].User,
+                DbInfos[tag].Password,
+                DbInfos[tag].Name);
+        }
+    }
+
+
     public interface IDbService {
-        Task<List<TOUT>> ReadBySelect<TIN, TOUT>(string selectStatement, bool justOne, TIN input);
+        Task<List<TOUT>> ReadBySelect<TIN, TOUT>(string databaseTag, string selectStatement, bool justOne, TIN input);
     } 
 
     public class DbServiceException : Exception {}
@@ -23,21 +69,18 @@ namespace com.krohne.genericdatabaseapiservice.Services {
 
     public class DbService : IDbService {
         private readonly IConfiguration Configuration;
-        private string databaseConnInfo;
+        private readonly IDbInfoService DbInfoService;
 
-        public DbService(IConfiguration configuration) {
+        public DbService(IConfiguration configuration, IDbInfoService dbInfoService) {
             Configuration = configuration;
-            databaseConnInfo = String.Format(
-                "Server={0};User ID={1};Password={2};Database={3}",
-                Configuration["Database:Host"],
-                Configuration["Database:User"],
-                Configuration["Database:Password"],
-                Configuration["Database:Name"]);
+            DbInfoService = dbInfoService;
         }
 
-        async public Task<List<TOUT>> ReadBySelect<TIN, TOUT>(string selectStatement, bool justOne, TIN input) {
+        async public Task<List<TOUT>> ReadBySelect<TIN, TOUT>(string databaseTag, string selectStatement, bool justOne, TIN input) {
             var itemList = new List<TOUT>();
 
+            var databaseConnInfo = DbInfoService.GetInfoStringByTag(databaseTag);
+
             Console.WriteLine("ConnInfo: {0}", databaseConnInfo);
             Console.WriteLine("Statement: {0}", selectStatement);
             

databaseInfo.json-example

@@ -0,0 +1,8 @@
+{
+    "pdb_el_reader1": {
+        "Host": "172.16.10.18",
+        "User": "apiservicetestdb",
+        "Password": "xxx",
+        "Name": "apiservicetestdb"
+    }
+}

generate.py

@@ -75,6 +75,7 @@ statementChecker = {
     'delete': re.compile('^delete', re.IGNORECASE),
     'post': re.compile('^insert', re.IGNORECASE)
 }
+databaseTagFinder = re.compile('DATABASETAGBEGIN (.*) DATABASETAGEND')
 
 operations = []
 for path in apiDefinition['paths'].values():
@@ -100,6 +101,9 @@ for path in apiDefinition['paths'].values():
                 statement = statementFinderResult.group(1)
                 if not statementChecker[method].match(statement):
                     raise Exception(f"Invalid statement {statement} for method {method}")
+            databaseTagFinderResult = databaseTagFinder.search(description)
+            if databaseTagFinderResult:
+                databaseTag = databaseTagFinderResult.group(1)
 
         bodyInputType = {} 
         if 'requestBody' in operation:
@@ -124,6 +128,7 @@ for path in apiDefinition['paths'].values():
             'allSelector': operation['operationId'].endswith('all'),
             'byIdSelector': operation['operationId'].endswith('byid'),
             'statement': statement,
+            'databaseTag': databaseTag,
             'bodyInputType': bodyInputType,
             'paramInputTypes': paramInputTypes
         })

generateAll.sh

@@ -90,7 +90,7 @@ if [ "$STAGE2" = "1" ]; then
   echo "patch DbService registering into generated startup code"
   sed -i output/src/$PACKAGE_NAME/Startup.cs \
       -e 's#\(using '$PACKAGE_NAME'.OpenApi;\)#\1\n\n// added by post-processor\nusing '$PACKAGE_NAME'.Services;\n#' \
-      -e 's#^\([[:space:]]*\)\(// Add framework services.\)#\1// added by post-processor\n\1services.AddTransient<IDbService, DbService>();\n\n\1\2#' \
+      -e 's#^\([[:space:]]*\)\(// Add framework services.\)#\1// added by post-processor\n\1services.AddSingleton<IDbInfoService, DbInfoService>();\n\1services.AddTransient<IDbService, DbService>();\n\n\1\2#' \
       -e 's#\(c.RoutePrefix = "\)openapi\(";\)#\1'$ROUTE_PREFIX'/api/doc\2#' \
       -e 's#\(c.SwaggerEndpoint("\)/openapi/2.0.0/openapi.json\(", "Generic Database API Service");\)#\1/'$ROUTE_PREFIX'/api/openapi/JSON\2#' \
       -e 's#\(c.RouteTemplate = "\)openapi/{documentName}/openapi.json\(";\)#\1'$ROUTE_PREFIX'/api/openapi/JSON\2#' \

openapi.yaml

@@ -26,6 +26,9 @@ paths:
       operationId: Regular.productionOrder
       summary: Returns productionOrder entries
       description:
+        DATABASETAGBEGIN
+          pdb_el_reader1
+        DATABASETAGEND
         STATEMENTBEGIN
           SELECT produktionsauftrag AS productionOrderNumber,
                  C_Nummer AS cgNumber,

regular.cs.tmpl

@@ -86,7 +86,8 @@ ${operation['func']}InputType, #slurp
               #else            
 Object, #slurp
 #end if 
-$operation['resultType']['csName']>("#slurp
+$operation['resultType']['csName']>(#slurp
+"$operation['databaseTag']", "#slurp
               #if not $operation['statement'] 
 SELECT #slurp
               #set $sep = ""