Access azure storage options via REST APIs.
This package handles all the encryption and formatting required to provide easy access to azure storage options via REST APIs in a flutter project. The package currently provides functions to query and upload data to Azure blobs, tables and queues.
dependencies:
azstore: ^latest_versionimport 'package:azstore/azstore.dart';Get your connection string from the azure portal after simply creating a storage account (you can follow the walkthrough in the section Creating Azure Storage Account)
Azure blob allows storage of unstructured data in containers.
Typical use cases are shown below.
Future<void> testUploadImage() async {
File testFile =File('C:/Users/HP/Pictures/fdblack.png');
Uint8List bytes = testFile.readAsBytesSync();
var storage = AzureStorage.parse('your connection string');
try {
await storage.putBlob('/azpics/fdblack.png',
bodyBytes: bytes,//Text can be uploaded to 'blob' in which case body parameter is specified instead of 'bodyBytes'
contentType: 'image/png',
);
}catch(e){
print('exception: $e');
}
}Delete blob operations can also be performed as shown.
Future<void> testDeleteBlob() async {
var storage = AzureStorage.parse('your connection string');
try {
await storage.deleteBlob('/azpics/fdblack.png');
print('done deleting');
}catch(e){
print('exception: $e');
}
}Also explore the appendBlock, createContainer and deleteContainer functions.
The Azure Table service offers structured NoSQL storage in the form of tables.
Tables can be managed using the createTable,deleteTable and getTables functions.
Table nodes/rows can be controlled using other functions such as upsertTableRow,putTableRow,getTableRow and deleteTableRow.
The following snippets show the use of some table access functions. Also refer to the Azure Tables docs for allowed data types to insert in a table row. The code documentation provides further help.
Use upsertTableRow when updating or adding new table row and putTableRow to replace or add a new row.
Future<void> testUpload2Table() async {
var storage = AzureStorage.parse('your connection string');
try {
var myPartitionKey='partition_key';
var myRowKey='237';
Map<String, dynamic> rowMap={"Address":"Santa Clara",
"Age":23,
"AmountDue":200.23,
"[email protected]":"Edm.Guid",
"CustomerCode":"c9da6455-213d-42c9-9a79-3e9149a57833",
"[email protected]":"Edm.DateTime",
"CustomerSince":"2008-07-10T00:00:00",
"IsActive":false,
"[email protected]":"Edm.Int64",
"NumberOfOrders":"255",
"PartitionKey":"$myPartitionKey",
"RowKey":"$myRowKey"
};
await storage.upsertTableRow(
tableName: 'profiles',
rowKey:myRowKey,
bodyMap: rowMap
);
}catch(e){
print('tables upsert exception: $e');
}
}
Specific Table rows can be retrieved using getTableRow function as shown below. Filters can also be used to retrieve a list of table rows by using the filterTableRows function specifying the filter logic in the filter parameter.
Future<void> testGetTableRow() async {
var storage = AzureStorage.parse('your connection string');
try {
var myPartitionKey='partition_key';
var myRowKey='unique_row_id';
String result=await storage.getTableRow(
tableName: 'profiles',
partitionKey:myPartitionKey,
rowKey:myRowKey,
fields: ['Address','CustomerSince']
);
print('result: $result');
}catch(e){
print('tables get exception: $e');
}
}
Future<void> testFilterTable() async {
var storage = AzureStorage.parse('your connection string');
List<dynamic> result=await storage.filterTableRows(tableName: 'profiles',
filter: 'Age%20lt%2024',
fields: ['Age','CustomerSince'],
top:30
);
print('\nFilter results');
for(var res in result){
print(res);
}
}Table rows can also be deleted.
Future<void> testDeleteTableRow() async {
try {
var storage = AzureStorage.parse('your connection string');
await storage.deleteTableRow(tableName: 'profiles', partitionKey: 'fgtdssdas', rowKey: '232');
}catch(e){
print('delete exception: $e');
}
}Azure Queue Storage allows you store large numbers of messages. Queues in your storage account can easily be managed using createQueue, deleteQueue, getQList and getQData functions.
Future<void> testCreateQ() async {
try{
var storage = AzureStorage.parse('your connection string');
await storage.createQueue('myqueue');
}catch(e){
print('create queue error: $e');
}
}
Future<void> testGetQData() async {
var storage = AzureStorage.parse('your connection string');
try {
String qName='myqueue';
Map<String, String> result = await storage.getQData(qName);
print('showing $qName data:\n');
for (var res in result.entries) {
print('${res.key}: ${res.value}');
}
}catch(e){
print('get queue data error: $e');
}
}
Future<void> testGetQList() async {
try{
var storage = AzureStorage.parse('your connection string');
List<String> result=await storage.getQList();
print('showing queue list\n');
for(String res in result){
print(res);
}
}catch(e){
print('get queue list error: $e');
}
}
Future<void> testDeleteQ() async {
try{
var storage = AzureStorage.parse('your connection string');
await storage.deleteQueue('myqueue');
}catch(e){
print('delete queue error: $e');
}
}
To insert and access messages in a queue, the functions putQMessage, getQmessages,peekQmessage,clearQmessages and delQmessages can be used as shown below.
Future<void> testPutMessage() async {
var storage = AzureStorage.parse('your connection string');
try {
await storage.putQMessage(qName:'ttable', message: 'testing queue updates');
}catch(e){
print('get data error: ${e.statusCode} ${e.message}');
}
}
Future<void> testGetQMessages() async {
var storage = AzureStorage.parse('your connection string');
print('working on results...');
try {
List<AzureQMessage> result = await storage.getQmessages(qName: 'ttable',
numOfmessages: 10
);
print('showing get results');
for (var res in result) {
print('message ${res}');
}
}catch (e){
print('Q get messages exception $e');
}
}
Future<void> testPeekQMessages() async {
var storage = AzureStorage.parse('your connection string');
try {
List<AzureQMessage> result = await storage.peekQmessages(qName: 'ttable');
print('showing peek results');
for (var res in result) {
print('message ${res.messageText}');
}
}catch (e){
print('Q peek messages exception $e');
}
}
Future<void> testClearQMessage() async {
var storage = AzureStorage.parse('your connection string');
try {
await storage.clearQmessages('ttable');
}catch(e){
print('clear QM error: ${e.statusCode} ${e.message}');
}
}
Future<void> testDeleteMessage() async {
var storage = AzureStorage.parse('your connection string');
try {
await storage.delQmessage(qName: 'ttable',
messageId: '27bc633b-4de0-42bf-bea6-0860bd410f4e',
popReceipt: 'AgAAAAMAAAAAAAAAX3e0UwAg1wE='
);
}catch(e){
print('delete QM error: $e');
}
}The package provides internal documentation and required function parameters to ease working with functions. Also refer to the Azure official documentation for details on queue operations and message lifecycle.
createContainer: Create new blob container.deleteContainer: Delete blob container.putBlob: Put/update blob value.appendBlock: Add block to blob.deleteBlob: Delete blob.
createTable: Create azure table.deleteTable: Delete azure table.getTables: Get tables in storage account.upsertTableRow: Update/insert new table row/node.putTableRow: Insert/replace new table row/node.getTableRow: Get table row/node values.filterTableRows: Search through rows with specified filter.deleteTableRow: Delete table node/row.
createQueue: Create new queue.getQData: Get properties of a queue.deleteQueue: Delete queue from storage account.getQList: Get list of all queues.putQMessage: Insert message to queue.getQmessages: Get a list of queue message objects while changing visibilty.peekQmessages: Get a list of queue message objects without changing visibility.delQmessage: Delete queue message.updateQmessage: Update queue message.clearQmessages: Delete all queue messages.
You would need an azure storage account to complete this walk through.
Navigate to your azure portal and create a resource by clicking the create a resourse button then select storage accounts or simply click the storage accounts button if it appears on your home page.
Enter details for your new storage account and then Review + create . Also feel free to explore options in the other tabs (Networking, Data Protection, Advanced and Tags) for more control over your storage account. (Review process may take a few seconds).
Complete account creation by clicking the Create button after review is complete.
Go to resource after deployment is complete.
.
In the resource page, navigate to the Access keys tab and show keys. The show keys button exposes your access keys and connection string which is all you need to use this flutter package.