APIs for building secure & reliable microservices
Dapr allows you to build state-of-the-art apps in half the time and never worry about missing a deadline or delivering insecure & unreliable code.
Get started
Dapr allows you to build state-of-the-art apps in half the time and never worry about missing a deadline or delivering insecure & unreliable code.
Get started
Diagrid is trusted by:
Author workflows in code to automate complex business processes that are stateful, durable, and long-running.
Automatic handling of failures and errors
Support for task chaining, fan-out/fan-in, monitor and external system interaction
Workflow state can be stored in your database
public class MoneyTransferWorkflow : Workflow<MoneyTransferParams, bool>
{
public override async Task<bool> RunAsync(WorkflowContext context, MoneyTransferParams input)
{
// withdraw money from account
await context.CallActivityAsync(nameof(WithdrawActivity), new WithdrawParams(input.fromAccount, input.amount));
try
{
// deposit money in target account
await context.CallActivityAsync(nameof(DepositActivity), new DepositParams(input.toAccount, input.amount));
}
catch (System.Exception)
{
// in case of error deposit back the money in the original account
await context.CallActivityAsync(nameof(DepositActivity), new DepositParams(input.fromAccount, input.amount));
}
return true;
}
}def money_transfer_workflow(ctx: DaprWorkflowContext, input: MoneyTransferParams):
# withdraw money from account
yield ctx.call_activity(withdraw, input=WithdrawParams(input.fromAccount, input.amount))
try:
# deposit money in target account
yield ctx.call_activity(deposit, input=DepositParams(input.toAccount, input.amount))
except Exception as e:
# in case of error deposit back the money in the original account
yield ctx.call_activity(deposit, input=DepositParams(input.fromAccount, input.amount))const moneyTransferWorkflow = async function*(ctx, input) {
// withdraw money from account
yield ctx.callActivity(withdrawActivity, { account: input.fromAccount, amount: input.amount });
try {
// deposit money in target account
yield ctx.callActivity(depositActivity, { account: input.toAccount, amount: input.amount });
} catch (error) {
// in case of error deposit back the money in the original account
yield ctx.callActivity(depositActivity, { account: input.fromAccount, amount: input.amount });
}
}
public class MoneyTransferWorkflow extends Workflow {
@Override
public WorkflowStub create() {
return ctx -> {
MoneyTransferParams input = ctx.getInput(MoneyTransferParams.class);
// withdraw money from account
ctx.callActivity(WithdrawActivity.class.getName(), new WithdrawParams(input.fromAccount, input.amount)).await();
try {
// deposit money in target account
ctx.callActivity(DepositActivity.class.getName(), new DepositParams(input.toAccount, input.amount)).await();
} catch (Exception e) {
// in case of error deposit back the money in the original account
ctx.callActivity(DepositActivity.class.getName(), new DepositParams(input.fromAccount, input.amount)).await();
}
};
}
}func MoneyTransferWorkflow(ctx *workflow.WorkflowContext) (any, error) {
var input MoneyTransferParams
if err := ctx.GetInput(&input); err != nil {
return nil, err
}
// withdraw money from account
if err := ctx.CallActivity(Withdraw, workflow.ActivityInput(WithdrawParams{
Account: input.FromAccount,
Amount: input.Amount,
})).Await(nil); err != nil {
return nil, err
}
// deposit money in target account
if err := ctx.CallActivity(Deposit, workflow.ActivityInput(DepositParams{
Account: input.ToAccount,
Amount: input.Amount,
})).Await(nil); err != nil {
// in case of error deposit back the money in the original account
return nil, ctx.CallActivity(Deposit, workflow.ActivityInput(DepositParams{
Account: input.FromAccount,
Amount: input.Amount,
})).Await(nil)
}
return nil, nil
}
Create event-driven apps that scale to millions of events/sec. Integrates with dozens of message brokers.
Configurable push/pull eventing
At-least-once guaranteed message delivery
Automatic CloudEvents support
Bulk message delivery
using Dapr.Client;
var client = new DaprClientBuilder().Build();
// Publish message
await client.PublishEventAsync(“my-pubsub”, "my-topic", “my-message”);from dapr.clients import DaprClient;
with DaprClient() as d:
result = d.publish_event(
pubsub_name = "my-pubsub",
topic_name = 'orders',
data = `{ "orderId": 1 }`,
data_content_type = 'application/json')import { DaprClient, CommunicationProtocolEnum } from "@dapr/dapr";
(async () => {
const client = new DaprClient({ communicationProtocol: CommunicationProtocolEnum.HTTP });
await client.pubsub.publish("my-pubsub", "orders", {"orderId":"1"});
})()import io.dapr.client.DaprClient;
import io.dapr.client.DaprClientBuilder;
import io.dapr.client.domain.Metadata;
import static java.util.Collections.singletonMap;
DaprClient client = new DaprClientBuilder().build()
client.publishEvent("pubsub", "orders", "{\"orderId\":\"1\"}", singletonMap(Metadata.TTL_IN_SECONDS, "600")).block();
package main
import (
"context"
"fmt"
dapr "github.com/dapr/go-sdk/client"
)
func main() {
client, err := dapr.NewClient()
if err != nil {
panic(fmt.Errorf("error creating connection to catalyst: %w", err))
}
defer client.Close()
if err := client.PublishEvent(context.TODO(), "pubsub", "{topic-name}",
[]byte(`{"key":"value"}`)); err != nil {
panic(fmt.Errorf("error publishing event: %w", err))
}
}
Connect apps running on any cloud platform and across any region.
Zero networking configuration
Service discovery
End-to-end mTLS & authorization
using Dapr.Client;
var client = new DaprClientBuilder().Build();
var httpClient = DaprClient.CreateInvokeHttpClient(“my-target-app”);
httpClient.DefaultRequestHeaders.Add("dapr-api-token", “my-api-token”);
var response = await httpClient.PostAsync("/target-method", "{\"data\":\"my-data\"}");from dapr.clients import DaprClient;
headers = { 'dapr-app-id': ‘my-target-app’, 'content-type': 'application/json'}
result = requests.post(
url = '/orders',
data =‘{
\"data\":\"my-data\"}’,
headers = headers)import axios from "axios";
async function main() {
// Adding app id as part of the header
let axiosConfig = {
headers: {
"dapr-app-id": "order-processor"
}
};
const order = { orderId: 1 };
const res = await axios.post(`/orders`, order , axiosConfig);
}
main().catch(e => console.error(e))private static final HttpClient httpClient = HttpClient.newBuilder()
.version(HttpClient.Version.HTTP_2)
.connectTimeout(Duration.ofSeconds(10))
.build();
private static final String DAPR_HTTP_PORT = System.getenv().getOrDefault("DAPR_HTTP_PORT", "3500");
public static void main(String[] args) throws InterruptedException, IOException {
String dapr_url = "http://localhost:" + DAPR_HTTP_PORT + "/orders";
int orderId = 1;
JSONObject obj = new JSONObject();
obj.put("orderId", orderId);
HttpRequest request = HttpRequest.newBuilder()
.POST(HttpRequest.BodyPublishers.ofString(obj.toString()))
.uri(URI.create(dapr_url))
.header("Content-Type", "application/json")
.header("dapr-app-id", "order-processor")
.build();
HttpResponse<String> response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());
System.out.println("Order passed: "+ orderId);
TimeUnit.MILLISECONDS.sleep(1000);
}import (
"context"
"fmt"
"net/http"
dapr "github.com/dapr/go-sdk/client"
)
func main() {
client, err := dapr.NewClient()
if err != nil {
panic(fmt.Errorf("error creating connection to catalyst: %w", err))
}
defer client.Close()
order := `{"orderId":` + strconv.Itoa(i) + "}"
req, err := http.NewRequest("POST", "/orders", strings.NewReader(order))
if err != nil {
panic()
}
req.Header.Add("dapr-app-id", "order-processor")
response, err := client.Do(req)
if err != nil {
panic()
}
Create CRUD applications with key/value state. Integrates with dozens of databases.
Data isolation for multi-tenancy
Configurable concurrency (first-write-wins, last-write-wins)
Configurable consistency (strong, eventual)
Caching support with TTL
using Dapr.Client;
var client = new DaprClientBuilder().Build();
await client.SaveStateAsync(“my-database”, “1”, “myvalue”);from dapr.clients import DaprClient
with DaprClient() as d:
order = {'orderId': "1", "name": "lightsaber (real)"}
client.save_state("my-database", "1", str(order))
import { CommunicationProtocolEnum, DaprClient } from "@dapr/dapr"
const order = { orderId: "1" }
const state = [
{
key: order.orderId,
value: order,
options: {
consistency: "strong",
concurrency: "first-write-wins"
}
}
]
const client = new DaprClient({ communicationProtocol: CommunicationProtocolEnum.HTTP });
await client.state.save("my-database", state)import io.dapr.client.DaprClient;
import io.dapr.client.DaprClientBuilder;
DaprClient client = new DaprClientBuilder().build();
Order order = new Order();
order.setOrderId(orderId);
client.saveState("my-database", String.valueOf(orderId), order).block();package main
import (
"context"
"fmt"
dapr "github.com/dapr/go-sdk/client"
)
func main() {
client, err := dapr.NewClient()
if err != nil {
panic()
}
defer client.Close()
if err := err := client.SaveState(context.Background(), "my-database, "order", []byte("value), nil); err != nil {
panic()
}
}
Interact with external systems via triggers and outgoing calls.
Integrations with dozens of third party services
Authenticate calls to/from external systems
using Dapr.Client;
var client = new DaprClientBuilder().Build();
await client.InvokeBindingAsync(“my-binding”, “create”, “my-data”);from dapr.clients import DaprClient
with DaprClient() as d:
resp = d.invoke_binding(
binding_name="my-binding",
operation="create", data="100")import { DaprClient, CommunicationProtocolEnum } from "@dapr/dapr";
(async () => {
const client = new DaprClient({ communicationProtocol: CommunicationProtocolEnum.HTTP });
await client.binding.send("my-binding", "create", 100);
})()import io.dapr.client.DaprClient;
import io.dapr.client.DaprClientBuilder;
DaprClient client = new DaprClientBuilder().build()
client.invokeBinding("my-binding", "create", "100").block();package main
import (
"context"
"fmt"
dapr "github.com/dapr/go-sdk/client"
)
func main() {
client, err := dapr.NewClient()
if err != nil {
panic(fmt.Errorf("error creating connection to catalyst: %w", err))
}
defer client.Close()
err = client.InvokeOutputBinding(context.TODO(),
&dapr.InvokeBindingRequest{
Name: "my-binding",
Operation: "create",
Data: []byte(`100`),
})
if err != nil {
panic(err)
}
}
Author workflows in code to automate complex business processes that are stateful, durable, and long-running.
Automatic handling of failures and errors
Support for task chaining, fan-out/fan-in, monitor and external system interaction
Workflow state can be stored in your database
{
public override async Task<OrderResult> RunAsync(WorkflowContext context, OrderPayload order)
{
string orderId = context.InstanceId;
// Notify the user that an order has come through
await context.CallActivityAsync(
nameof(NotifyActivity),
new Notification($"Received order {orderId} for {order.Quantity} {order.Name} at ${order.TotalCost}"));
string requestId = context.InstanceId;
// Determine if there is enough of the item available for purchase by checking the inventory
InventoryResult result = await context.CallActivityAsync<InventoryResult>(
nameof(ReserveInventoryActivity),
new InventoryRequest(RequestId: orderId, order.Name, order.Quantity));
// If there is insufficient inventory, fail and let the user know
if (!result.Success)
{
// End the workflow here since we don't have sufficient inventory
await context.CallActivityAsync(
nameof(NotifyActivity),
new Notification($"Insufficient inventory for {order.Name}"));
return new OrderResult(Processed: false);
}
// There is enough inventory available so the user can purchase the item(s). Process their payment
await context.CallActivityAsync(
nameof(ProcessPaymentActivity),
new PaymentRequest(RequestId: orderId, order.Name, order.Quantity, order.TotalCost));
try
{
// There is enough inventory available so the user can purchase the item(s). Process their payment
await context.CallActivityAsync(
nameof(UpdateInventoryActivity),
new PaymentRequest(RequestId: orderId, order.Name, order.Quantity, order.TotalCost));
}
catch (TaskFailedException)
{
// Let them know their payment was processed
await context.CallActivityAsync(
nameof(NotifyActivity),
new Notification($"Order {orderId} Failed! You are now getting a refund"));
return new OrderResult(Processed: false);
}
// Let them know their payment was processed
await context.CallActivityAsync(
nameof(NotifyActivity),
new Notification($"Order {orderId} has completed!"));
// End the workflow with a success result
return new OrderResult(Processed: true);
}
}def main(self):
item_name = "lightsaber"
order_quantity = 100
total_cost = int(order_quantity) * baseInventory[item_name].per_item_cost
order = OrderPayload(item_name=item_name, quantity=int(order_quantity), total_cost=total_cost)
print(f'Starting order workflow, purchasing {order_quantity} of {item_name}', flush=True)
start_resp = daprClient.start_workflow(workflow_component=workflow_component,
workflow_name=workflow_name,
input=order)
_id = start_resp.instance_id
def prompt_for_approval(daprClient: DaprClient):
daprClient.raise_workflow_event(instance_id=_id, workflow_component=workflow_component,
event_name="manager_approval", event_data={'approval': True})
approval_seeked = False
start_time = datetime.now()
while True:
time_delta = datetime.now() - start_time
state = daprClient.get_workflow(instance_id=_id, workflow_component=workflow_component)
if not state:
print("Workflow not found!") # not expected
elif state.runtime_status == "Completed" or\
state.runtime_status == "Failed" or\
state.runtime_status == "Terminated":
print(f'Workflow completed! Result: {state.runtime_status}', flush=True)
break
if time_delta.total_seconds() >= 10:
state = daprClient.get_workflow(instance_id=_id, workflow_component=workflow_component)
if total_cost > 50000 and (
state.runtime_status != "Completed" or
state.runtime_status != "Failed" or
state.runtime_status != "Terminated"
) and not approval_seeked:
approval_seeked = True
threading.Thread(target=prompt_for_approval(daprClient), daemon=True).start()
print("Purchase of item is ", state.runtime_status, flush=True)
def restock_inventory(self, daprClient: DaprClient, baseInventory):
for key, item in baseInventory.items():
print(f'item: {item}')
item_str = f'{{"name": "{item.item_name}", "quantity": {item.quantity},\
"per_item_cost": {item.per_item_cost}}}'
daprClient.save_state(store_name, key, item_str)export const orderProcessingWorkflow: TWorkflow = async function* (ctx: WorkflowContext, orderPayLoad: OrderPayload): any {
const orderId = ctx.getWorkflowInstanceId();
console.log(`Processing order ${orderId}...`);
const orderNotification: OrderNotification = {
message: `Received order ${orderId} for ${orderPayLoad.quantity} ${orderPayLoad.itemName} at a total cost of ${orderPayLoad.totalCost}`,
};
yield ctx.callActivity(notifyActivity, orderNotification);
const inventoryRequest = new InventoryRequest(orderId, orderPayLoad.itemName, orderPayLoad.quantity);
const inventoryResult = yield ctx.callActivity(reserveInventoryActivity, inventoryRequest);
if (!inventoryResult.success) {
const orderNotification: OrderNotification = {
message: `Insufficient inventory for order ${orderId}`,
};
yield ctx.callActivity(notifyActivity, orderNotification);
return;
}
if (orderPayLoad.totalCost > 5000) {
const approvalResult = yield ctx.callActivity(requestApprovalActivity, orderPayLoad);
if (!approvalResult) {
const orderNotification: OrderNotification = {
message: `Order ${orderId} approval denied`,
};
yield ctx.callActivity(notifyActivity, orderNotification);
return;
}
}
const orderPaymentRequest = new OrderPaymentRequest(orderId, orderPayLoad.itemName, orderPayLoad.totalCost, orderPayLoad.quantity);
const paymentResult = yield ctx.callActivity(processPaymentActivity, orderPaymentRequest);
if (!paymentResult) {
const orderNotification: OrderNotification = {
message: `Payment for order ${orderId} failed`,
};
yield ctx.callActivity(notifyActivity, orderNotification);
return;
}
const updatedResult = yield ctx.callActivity(updateInventoryActivity, inventoryRequest);
if (!updatedResult.success) {
const orderNotification: OrderNotification = {
message: `Failed to update inventory for order ${orderId}`,
};
yield ctx.callActivity(notifyActivity, orderNotification);
return;
}
const orderCompletedNotification: OrderNotification = {
message: `order ${orderId} processed successfully!`,
};
yield ctx.callActivity(notifyActivity, orderCompletedNotification);
console.log(`Order ${orderId} processed successfully!`);
}public WorkflowStub create() {
return ctx -> {
Logger logger = ctx.getLogger();
String orderId = ctx.getInstanceId();
logger.info("Starting Workflow: " + ctx.getName());
logger.info("Instance ID(order ID): " + orderId);
logger.info("Current Orchestration Time: " + ctx.getCurrentInstant());
OrderPayload order = ctx.getInput(OrderPayload.class);
logger.info("Received Order: " + order.toString());
OrderResult orderResult = new OrderResult();
orderResult.setProcessed(false);
// Notify the user that an order has come through
Notification notification = new Notification();
notification.setMessage("Received Order: " + order.toString());
ctx.callActivity(NotifyActivity.class.getName(), notification).await();
// Determine if there is enough of the item available for purchase by checking
// the inventory
InventoryRequest inventoryRequest = new InventoryRequest();
inventoryRequest.setRequestId(orderId);
inventoryRequest.setItemName(order.getItemName());
inventoryRequest.setQuantity(order.getQuantity());
InventoryResult inventoryResult = ctx.callActivity(ReserveInventoryActivity.class.getName(),
inventoryRequest, InventoryResult.class).await();
// If there is insufficient inventory, fail and let the user know
if (!inventoryResult.isSuccess()) {
notification.setMessage("Insufficient inventory for order : " + order.getItemName());
ctx.callActivity(NotifyActivity.class.getName(), notification).await();
ctx.complete(orderResult);
return;
}
// Require orders over a certain threshold to be approved
if (order.getTotalCost() > 5000) {
ApprovalResult approvalResult = ctx.callActivity(RequestApprovalActivity.class.getName(),
order, ApprovalResult.class).await();
if (approvalResult != ApprovalResult.Approved) {
notification.setMessage("Order " + order.getItemName() + " was not approved.");
ctx.callActivity(NotifyActivity.class.getName(), notification).await();
ctx.complete(orderResult);
return;
}
}
// There is enough inventory available so the user can purchase the item(s).
// Process their payment
PaymentRequest paymentRequest = new PaymentRequest();
paymentRequest.setRequestId(orderId);
paymentRequest.setItemBeingPurchased(order.getItemName());
paymentRequest.setQuantity(order.getQuantity());
paymentRequest.setAmount(order.getTotalCost());
boolean isOK = ctx.callActivity(ProcessPaymentActivity.class.getName(),
paymentRequest, boolean.class).await();
if (!isOK) {
notification.setMessage("Payment failed for order : " + orderId);
ctx.callActivity(NotifyActivity.class.getName(), notification).await();
ctx.complete(orderResult);
return;
}
inventoryResult = ctx.callActivity(UpdateInventoryActivity.class.getName(),
inventoryRequest, InventoryResult.class).await();
if (!inventoryResult.isSuccess()) {
notification.setMessage("Order failed to update inventory! : " + orderId);
ctx.callActivity(NotifyActivity.class.getName(), notification).await();
ctx.complete(orderResult);
return;
}
// Let user know their order was processed
notification.setMessage("Order completed! : " + orderId);
ctx.callActivity(NotifyActivity.class.getName(), notification).await();
// Complete the workflow with order result is processed
orderResult.setProcessed(true);
ctx.complete(orderResult);
};
}func OrderProcessingWorkflow(ctx *workflow.WorkflowContext) (any, error) {
orderID := ctx.InstanceID()
var orderPayload OrderPayload
if err := ctx.GetInput(&orderPayload); err != nil {
return nil, err
}
err := ctx.CallActivity(NotifyActivity, workflow.ActivityInput(Notification{
Message: fmt.Sprintf("Received order %s for %d %s - $%d", orderID, orderPayload.Quantity, orderPayload.ItemName, orderPayload.TotalCost),
})).Await(nil)
if err != nil {
return OrderResult{Processed: false}, err
}
var verifyInventoryResult InventoryResult
if err := ctx.CallActivity(VerifyInventoryActivity, workflow.ActivityInput(InventoryRequest{
RequestID: orderID,
ItemName: orderPayload.ItemName,
Quantity: orderPayload.Quantity,
})).Await(&verifyInventoryResult); err != nil {
return OrderResult{Processed: false}, err
}
if !verifyInventoryResult.Success {
notification := Notification{Message: fmt.Sprintf("Insufficient inventory for %s", orderPayload.ItemName)}
err := ctx.CallActivity(NotifyActivity, workflow.ActivityInput(notification)).Await(nil)
return OrderResult{Processed: false}, err
}
if orderPayload.TotalCost > 50000 {
var approvalRequired ApprovalRequired
if err := ctx.CallActivity(RequestApprovalActivity, workflow.ActivityInput(orderPayload)).Await(&approvalRequired); err != nil {
return OrderResult{Processed: false}, err
}
if err := ctx.WaitForExternalEvent("manager_approval", time.Second*200).Await(nil); err != nil {
return OrderResult{Processed: false}, err
}
// TODO: Confirm timeout flow - this will be in the form of an error.
if approvalRequired.Approval {
if err := ctx.CallActivity(NotifyActivity, workflow.ActivityInput(Notification{Message: fmt.Sprintf("Payment for order %s has been approved!", orderID)})).Await(nil); err != nil {
log.Printf("failed to notify of a successful order: %v\n", err)
}
} else {
if err := ctx.CallActivity(NotifyActivity, workflow.ActivityInput(Notification{Message: fmt.Sprintf("Payment for order %s has been rejected!", orderID)})).Await(nil); err != nil {
log.Printf("failed to notify of an unsuccessful order :%v\n", err)
}
return OrderResult{Processed: false}, err
}
}
err = ctx.CallActivity(ProcessPaymentActivity, workflow.ActivityInput(PaymentRequest{
RequestID: orderID,
ItemBeingPurchased: orderPayload.ItemName,
Amount: orderPayload.TotalCost,
Quantity: orderPayload.Quantity,
})).Await(nil)
if err != nil {
if err := ctx.CallActivity(NotifyActivity, workflow.ActivityInput(Notification{Message: fmt.Sprintf("Order %s failed!", orderID)})).Await(nil); err != nil {
log.Printf("failed to notify of a failed order: %v", err)
}
return OrderResult{Processed: false}, err
}
err = ctx.CallActivity(UpdateInventoryActivity, workflow.ActivityInput(PaymentRequest{
RequestID: orderID,
ItemBeingPurchased: orderPayload.ItemName,
Amount: orderPayload.TotalCost,
Quantity: orderPayload.Quantity,
})).Await(nil)
if err != nil {
if err := ctx.CallActivity(NotifyActivity, workflow.ActivityInput(Notification{Message: fmt.Sprintf("Order %s failed!", orderID)})).Await(nil); err != nil {
log.Printf("failed to notify of a failed order: %v", err)
}
return OrderResult{Processed: false}, err
}
if err := ctx.CallActivity(NotifyActivity, workflow.ActivityInput(Notification{Message: fmt.Sprintf("Order %s has completed!", orderID)})).Await(nil); err != nil {
log.Printf("failed to notify of a successful order: %v", err)
}
return OrderResult{Processed: true}, err
}Create event-driven apps that scale to millions of events/sec. Integrates with dozens of message brokers.
Configurable push/pull eventing
At-least-once guaranteed message delivery
Automatic CloudEvents support
Bulk message delivery
using Dapr.Client;
var client = new DaprClientBuilder().Build();
// Publish message
await client.PublishEventAsync(“my-pubsub”, "my-topic",
“my-message”);from dapr.clients import DaprClient;
with DaprClient() as d:
result = d.publish_event(
pubsub_name = "my-pubsub",
topic_name = 'orders',
data = `{ "orderId": 1 }`,
data_content_type = 'application/json')import { DaprClient } from "@dapr/dapr";
(async () => {
const client = new DaprClient();
await client.pubsub.publish("my-pubsub", "orders", {"orderId":"1"});
})()import io.dapr.client.DaprClient;
import io.dapr.client.DaprClientBuilder;
import io.dapr.client.domain.Metadata;
import static java.util.Collections.singletonMap;
DaprClient client = new DaprClientBuilder().build()
client.publishEvent("pubsub", "orders", "{\"orderId\":\"1\"}",
singletonMap(Metadata.TTL_IN_SECONDS, "600")).block();
package main
import (
"context"
"fmt"
dapr "github.com/dapr/go-sdk/client"
)
func main() {
client, err := dapr.NewClient()
if err != nil {
panic(fmt.Errorf("error creating connection to catalyst: %w", err))
}
defer client.Close()
if err := client.PublishEvent(context.TODO(), "pubsub", "{topic-name}",
[]byte(`{"key":"value"}`)); err != nil {
panic(fmt.Errorf("error publishing event: %w", err))
}
}Connect apps running on any cloud platform and across any region.
Zero networking configuration
Service discovery
End-to-end mTLS & authorization
using Dapr.Client;
var client = new DaprClientBuilder().Build();
var httpClient = DaprClient.CreateInvokeHttpClient(“order-processor”);
httpClient.DefaultRequestHeaders.Add("dapr-api-token", “my-api-token”);
var response = await httpClient.PostAsync("/orders", "{\"data\":\"my-data\"}");headers = { 'dapr-app-id': ‘orderprocessor’, 'content-type': 'application/json'}
result = requests.post(
url = '/orders',
data =‘{\"data\":\"my-data\"}’, headers = headers)import axios from "axios";
(async () => {
let axiosConfig = {
headers: {
"dapr-app-id": "order-processor"
}
};
const order = { orderId: 1 };
const res = await axios.post(`/orders`, order , axiosConfig);
})()private static final HttpClient httpClient = HttpClient.newBuilder()
.version(HttpClient.Version.HTTP_2)
.connectTimeout(Duration.ofSeconds(10))
.build();
public static void main(String[] args) throws InterruptedException, IOException {
int orderId = 1;
JSONObject obj = new JSONObject();
obj.put("orderId", orderId);
HttpRequest request = HttpRequest.newBuilder()
.POST(HttpRequest.BodyPublishers.ofString(obj.toString()))
.uri(URI.create(dapr_url))
.header("Content-Type", "application/json")
.header("dapr-app-id", "order-processor")
.build();
HttpResponse<String> response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());
System.out.println("Order passed: "+ orderId);
}package main
import (
"context"
"fmt"
"net/http"
dapr "github.com/dapr/go-sdk/client"
)
func main() {
client, err := dapr.NewClient()
if err != nil {
panic(err)
}
defer client.Close()
order := `{"orderId":` + strconv.Itoa(i) + "}"
req, err := http.NewRequest("POST", "/orders", strings.NewReader(order))
if err != nil {
panic()
}
req.Header.Add("dapr-app-id", "order-processor")
response, err := client.Do(req)
if err != nil {
panic()
}
}Create CRUD applications with key/value state. Integrates with dozens of databases.
Data isolation for multi-tenancy
Configurable concurrency (first-write-wins, last-write-wins)
Configurable consistency (strong, eventual)
Caching support with TTL
using Dapr.Client;
var client = new DaprClientBuilder().Build();
await client.SaveStateAsync(“my-database”, “1”, “myvalue”);from dapr.clients import DaprClient
with DaprClient() as d:
order = {'orderId': "1", "name": "lightsaber (real)"}
client.save_state("my-database", "1", str(order))import { DaprClient } from "@dapr/dapr"
const order = { orderId: "1" }
const state = [
{
key: order.orderId,
value: order,
options: {
consistency: "strong",
concurrency: "first-write-wins"
}
}
]
const client = new DaprClient();
await client.state.save("my-database", state)import io.dapr.client.DaprClient;
import io.dapr.client.DaprClientBuilder;
DaprClient client = new DaprClientBuilder().build();
Order order = new Order();
order.setOrderId(orderId);
client.saveState("my-database", String.valueOf(orderId), order).block();package main
import (
"context"
"fmt"
dapr "github.com/dapr/go-sdk/client"
)
func main() {
client, err := dapr.NewClient()
if err != nil {
panic()
}
defer client.Close()
if err := err := client.SaveState(context.Background(),
"my-database, "order", []byte("value), nil); err != nil {
panic()
}
}Interact with external systems via triggers and outgoing calls.
Integrations with dozens of third party services
Authenticate calls to/from external systems
using Dapr.Client;
var client = new DaprClientBuilder().Build();
await client.InvokeBindingAsync(“my-binding”, “create”, “my-data”);from dapr.clients import DaprClient
with DaprClient() as d:
resp = d.invoke_binding(
binding_name="my-binding",
operation="create", data="100")import { DaprClient } from "@dapr/dapr";
(async () => {
const client = new DaprClient();
await client.binding.send("my-binding", "create", 100);
})()import io.dapr.client.DaprClient;
import io.dapr.client.DaprClientBuilder;
DaprClient client = new DaprClientBuilder().build()
client.invokeBinding("my-binding", "create", "100").block();package main
import (
"context"
"fmt"
dapr "github.com/dapr/go-sdk/client"
)
func main() {
client, err := dapr.NewClient()
if err != nil {
panic(fmt.Errorf("error creating connection to catalyst: %w", err))
}
defer client.Close()
err = client.InvokeOutputBinding(context.TODO(),
&dapr.InvokeBindingRequest{
Name: "my-binding",
Operation: "create",
Data: []byte(`100`),
})
if err != nil {
panic(err)
}
}Dapr's component model decouples your code from your infrastructure giving you cloud & edge portability. For example with the pub/sub API you can change the message broker by swapping out a component file from RabbitMQ to Kafka or any other supported broker without changing your code.
Get started
Secure the calls between your applications along with secure messaging on any message broker
Specify which applications can access what infrastructure dependency and apply advanced access control and RBAC for your applications
Apply data isolation to your apps, preventing cross-lateral attacks and data breaches
Choose between constant and exponential retries and apply them to service to service calls as well as any interaction with your underlying infrastructure
Protect against outages by applying gated circuit breakers to allow your infrastructure to heal on its own
Easily terminate long running operations by applying timeouts to service to service calls and any interaction with your underlying infrastructure
Get deep insights to request latency, throughput, error rates, and resource utilization (CPU, memory)
Automatic tracing makes it easy to understand the end-to-end flow of requests across your applications. See real-time visualizations across code and infrastructure. with no code instrumentation.
Detailed trail of activities on your applications providing accountability, compliance with regulations and security monitoring.
Dapr provides developers with APIs that abstract away the complexity of common challenges when building distributed applications. By letting Dapr take care of the complex challenges such as service communication, pub/sub, state management, workflow and secret management, developers can focus on business value and keep code lean and portable.
Diagrid’s founders were also the creators of the open source Dapr project. Along with the rest of the Diagrid team, they continue to play an active part in leading and contributing to the project.
