Calling Get_result_blocking Immediately After Starting Container Result In Container Not Found Error

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Introduction

When working with containers, it's essential to understand the sequence of operations to avoid potential issues. In this article, we'll explore a specific scenario where calling get_result_blocking() immediately after start_blocking() results in a "container not found" error. We'll delve into the underlying function, wait_container_response(), and discuss possible reasons for this behavior.

The Issue

The problem arises when get_result_blocking() is called right after start_blocking(). This sequence of operations leads to a "container not found" error, which is inconsistent and can be frustrating to debug. The underlying function, wait_container_response(), is unable to find the container despite it being started.

Possible Reasons

There are a few possible reasons for this behavior:

  • Time for container to start: It's possible that the container takes time to start, and by the time wait_container_response() is called, the container is not yet available. This could be due to the overhead of starting a container or the complexity of the container's initialization process.
  • Inconsistent behavior: The issue seems to be more pronounced when running cargo test compared to individual test runs. This inconsistency could be due to various factors, such as caching, environment variables, or dependencies.
  • Repeated runs: Interestingly, repeated runs after the first run seem to solve the issue. This could be due to caching or some other mechanism that resolves the issue after the first attempt.

Analyzing the Logs

Let's take a closer look at the logs from a failed action:

Warning: Docker container wait error
Warning: Docker container wait error
test fail_at_start ... ok
test command_parse ... FAILED
Error: Docker responded with status code 404: No such container: unhealthy-pies
stack backtrace:

As we can see, the logs contain a warning about a Docker container wait error, followed by a main error indicating that the container was not found. The error message mentions a status code of 404, which is a "Not Found" error.

Full Failed Action Logs

For a more detailed analysis, you can refer to the full failed action logs on GitHub:

https://github.com/walkerlab/orcapod/actions/runs/14921920603/job/41918758357

Conclusion

In conclusion, calling get_result_blocking() immediately after start_blocking() results in a "container not found" error due to the underlying function wait_container_response() being unable to find the container. Possible reasons for this behavior include the time it takes for the container to start, inconsistent behavior, and repeated runs. To resolve this issue, we may need to rethink our approach or use a different wait mechanism to wait for the container's completion.

Recommendations

Based on our analysis, here are some recommendations to resolve this issue:

  • Introduce a delay: Consider introducing a delay between start_blocking() and get_result_blocking() to allow the container to start.
  • Use a different wait mechanism: Explore alternative wait mechanisms, such as wait_container_reponse(), to wait for the's completion.
  • Improve logging: Enhance logging to provide more detailed information about the container's status and any errors that occur.

Introduction

In our previous article, we explored the issue of calling get_result_blocking() immediately after start_blocking() resulting in a "container not found" error. We discussed possible reasons for this behavior and provided recommendations to resolve the issue. In this article, we'll answer some frequently asked questions (FAQs) related to this topic.

Q: What is the underlying function that causes the "container not found" error?

A: The underlying function that causes the "container not found" error is wait_container_response(). This function is unable to find the container despite it being started.

Q: Why does the issue occur when running cargo test compared to individual test runs?

A: The issue seems to be more pronounced when running cargo test compared to individual test runs. This inconsistency could be due to various factors, such as caching, environment variables, or dependencies.

Q: Why does repeated runs after the first run seem to solve the issue?

A: Repeated runs after the first run seem to solve the issue due to caching or some other mechanism that resolves the issue after the first attempt.

Q: How can I introduce a delay between start_blocking() and get_result_blocking()?

A: You can introduce a delay between start_blocking() and get_result_blocking() using a library like std::thread::sleep() or std::chrono::duration. For example:

use std::thread;
use std::time::Duration;

// Start the container
start_blocking();

// Introduce a delay of 1 second
thread::sleep(Duration::from_secs(1));

// Get the result
get_result_blocking();

Q: What are some alternative wait mechanisms I can use to wait for the container's completion?

A: Some alternative wait mechanisms you can use to wait for the container's completion include:

  • wait_container_reponse(): This function is similar to wait_container_response() but may have different behavior or options.
  • wait_container_status(): This function waits for the container to reach a specific status, such as "running" or "exited".
  • wait_container_event(): This function waits for a specific event to occur, such as the container being started or stopped.

Q: How can I improve logging to provide more detailed information about the container's status and any errors that occur?

A: You can improve logging by using a logging library like log or env_logger. For example:

use log::{info, error};

// Start the container
start_blocking();

// Log a message indicating that the container is starting
info!("Container is starting");

// Get the result
let result = get_result_blocking();

// Log a message indicating that the container has completed
info!("Container has completed");

// Log any errors that occur
if let Err(err) = result {
    error!("Error occurred: {}", err);
}

Conclusion

In conclusion, calling get_result_blocking() immediately after start_blocking() results in a "container not found" error due to the underlying function wait_container_response() being unable to find the container. By introducing a delay, using alternative wait mechanisms, and improving logging, we can resolve this issue and improve the reliability and consistency of our container-based operations.