mirror of https://github.com/dapr/quickstarts.git
139 lines
4.8 KiB
Markdown
139 lines
4.8 KiB
Markdown
# Service Invocation
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In this quickstart, you'll create a checkout service and an order processor service to demonstrate how to use the service invocation API. The checkout service uses Dapr's http proxying capability to invoke a method on the order processing service.
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Visit [this](https://docs.dapr.io/developing-applications/building-blocks/service-invocation/) link for more information about Dapr and service invocation.
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This quickstart includes one checkout service:
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- Python client service `checkout`
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And one order processor service:
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- Python order-processor service `order-processor`
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## Run all apps with multi-app run template file:
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This section shows how to run both applications at once using [multi-app run template files](https://docs.dapr.io/developing-applications/local-development/multi-app-dapr-run/multi-app-overview/) with `dapr run -f .`. This enables to you test the interactions between multiple applications.
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1. Open a new terminal window and install dependencies for `order-processor` and `checkout` apps:
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<!-- STEP
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name: Install Node dependencies for order-processor and checkout
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-->
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```bash
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cd ./order-processor
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pip3 install -r requirements.txt
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cd ../checkout
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pip3 install -r requirements.txt
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cd ..
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```
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<!-- END_STEP -->
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2. Run the multi app run template:
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<!-- STEP
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name: Run multi app run template
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expected_stdout_lines:
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- 'Validating config and starting app "order-processor"'
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- 'Started Dapr with app id "order-processor"'
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- 'Writing log files to directory'
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- 'Validating config and starting app "checkout"'
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- 'Started Dapr with app id "checkout"'
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- 'Writing log files to directory'
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expected_stderr_lines:
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output_match_mode: substring
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match_order: none
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background: true
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sleep: 15
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timeout_seconds: 30
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-->
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```bash
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dapr run -f .
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```
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The terminal console output should look similar to this:
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```text
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== APP - order-processor == Order received : {"orderId": 1}
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== APP - order-processor == 127.0.0.1 - - [DATE] "POST /orders HTTP/1.1" 200 -
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== APP - checkout == Order passed: {"orderId": 1}
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== APP - order-processor == Order received : {"orderId": 2}
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== APP - order-processor == 127.0.0.1 - - [DATE] "POST /orders HTTP/1.1" 200 -
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== APP - checkout == Order passed: {"orderId": 2}
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== APP - order-processor == Order received : {"orderId": 3}
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== APP - order-processor == 127.0.0.1 - - [DATE] "POST /orders HTTP/1.1" 200 -
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== APP - checkout == Order passed: {"orderId": 3}
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== APP - order-processor == Order received : {"orderId": 4}
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== APP - order-processor == 127.0.0.1 - - [DATE] "POST /orders HTTP/1.1" 200 -
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== APP - checkout == Order passed: {"orderId": 4}
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== APP - order-processor == Order received : {"orderId": 5}
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== APP - order-processor == 127.0.0.1 - - [DATE] "POST /orders HTTP/1.1" 200 -
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== APP - checkout == Order passed: {"orderId": 5}
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== APP - order-processor == Order received : {"orderId": 6}
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== APP - order-processor == 127.0.0.1 - - [DATE] "POST /orders HTTP/1.1" 200 -
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== APP - checkout == Order passed: {"orderId": 6}
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== APP - order-processor == Order received : {"orderId": 7}
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== APP - order-processor == 127.0.0.1 - - [DATE] "POST /orders HTTP/1.1" 200 -
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== APP - checkout == Order passed: {"orderId": 7}
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== APP - order-processor == Order received : {"orderId": 8}
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== APP - order-processor == 127.0.0.1 - - [DATE] "POST /orders HTTP/1.1" 200 -
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== APP - checkout == Order passed: {"orderId": 8}
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== APP - order-processor == Order received : {"orderId": 9}
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== APP - order-processor == 127.0.0.1 - - [DATE] "POST /orders HTTP/1.1" 200 -
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== APP - checkout == Order passed: {"orderId": 9}
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== APP - order-processor == Order received : {"orderId": 10}
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== APP - order-processor == 127.0.0.1 - - [DATE] "POST /orders HTTP/1.1" 200 -
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== APP - checkout == Order passed: {"orderId": 10}
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```
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3. Stop and clean up application processes
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```bash
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dapr stop -f .
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```
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<!-- END_STEP -->
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## Run a single app at a time with Dapr (Optional)
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An alternative to running all or multiple applications at once is to run single apps one-at-a-time using multiple `dapr run .. -- python3 app.py` commands. This next section covers how to do this.
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### Run Python order-processor with Dapr
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1. Install dependencies for `order-processor` app:
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```bash
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cd ./order-processor
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pip3 install -r requirements.txt
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```
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2. Run the Python order-processor app with Dapr:
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```bash
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dapr run --app-port 8001 --app-id order-processor --app-protocol http --dapr-http-port 3501 -- python3 app.py
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```
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### Run Python checkout with Dapr
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1. Open a new terminal window and install dependencies for `checkout` app:
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```bash
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cd ./checkout
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pip3 install -r requirements.txt
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```
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2. Run the Python checkout app with Dapr:
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```bash
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dapr run --app-id checkout --app-protocol http --dapr-http-port 3500 -- python3 app.py
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```
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### Stop and clean up application processes
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```bash
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dapr stop --app-id checkout
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dapr stop --app-id order-processor
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```
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