Add Gophercon 2024 post (#446)

* feat(gophercon): Add Gophercon 2024 post

* feat(gophercon)- add documentation talk images add images alt and complete documentation talk part

* feat(gophercon): Add authors

* feat(gophercon): Add thumbnail

* feat(gophercon): Add a few words about TLA+

* feat(gophercon): add url

* feat(gophercon): compress images

* feat(gophercon): markdown formating for easier reviewing

* feat(gophercon): small fixes

* feat(gophercon)- add conclusion

* feat(build): Update Jekyll

* feat(gophercon): remove empty parts

* feat(gophercon): conclusion formating

* feat(gophercon): fixed list formating

* feat(gophercon): remove misplaced conclusion

---------

Co-authored-by: kelly-phan <[email protected]>
Co-authored-by: Nathan Boiron <[email protected]>

Gemfile.lock

@@ -11,41 +11,49 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.8.0)
-      public_suffix (>= 2.0.2, < 5.0)
+    addressable (2.8.7)
+      public_suffix (>= 2.0.2, < 7.0)
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+    ffi (1.17.0-aarch64-linux-gnu)
+    ffi (1.17.0-arm64-darwin)
+    ffi (1.17.0-x86_64-darwin)
+    ffi (1.17.0-x86_64-linux-gnu)
     forwardable-extended (2.6.0)
+    google-protobuf (3.25.3-aarch64-linux)
+    google-protobuf (3.25.3-arm64-darwin)
+    google-protobuf (3.25.3-x86_64-darwin)
+    google-protobuf (3.25.3-x86_64-linux)
     http_parser.rb (0.8.0)
-    i18n (1.10.0)
+    i18n (1.14.5)
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-    jekyll (4.2.2)
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       colorator (~> 1.0)
       em-websocket (~> 0.5)
       i18n (~> 1.0)
-      jekyll-sass-converter (~> 2.0)
+      jekyll-sass-converter (>= 2.0, < 4.0)
       jekyll-watch (~> 2.0)
-      kramdown (~> 2.3)
+      kramdown (~> 2.3, >= 2.3.1)
       kramdown-parser-gfm (~> 1.0)
       liquid (~> 4.0)
-      mercenary (~> 0.4.0)
+      mercenary (>= 0.3.6, < 0.5)
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-      rouge (~> 3.0)
+      rouge (>= 3.0, < 5.0)
       safe_yaml (~> 1.0)
-      terminal-table (~> 2.0)
+      terminal-table (>= 1.8, < 4.0)
+      webrick (~> 1.7)
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       jekyll (>= 3.7, < 5.0)
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     jekyll-redirect-from (0.16.0)
       jekyll (>= 3.3, < 5.0)
-    jekyll-sass-converter (2.2.0)
-      sassc (> 2.0.1, < 3.0)
+    jekyll-sass-converter (3.0.0)
+      sass-embedded (~> 1.54)
     jekyll-seo-tag (2.7.1)
       jekyll (>= 3.8, < 5.0)
     jekyll-twitter-plugin (2.1.0)
@@ -55,25 +63,33 @@ GEM
       rexml
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
-    liquid (4.0.3)
-    listen (3.7.1)
+    liquid (4.0.4)
+    listen (3.9.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.4.0)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
-    public_suffix (4.0.7)
-    rb-fsevent (0.11.1)
-    rb-inotify (0.10.1)
+    public_suffix (6.0.0)
+    rb-fsevent (0.11.2)
+    rb-inotify (0.11.1)
       ffi (~> 1.0)
-    rexml (3.2.5)
-    rouge (3.29.0)
+    rexml (3.3.2)
+      strscan
+    rouge (4.3.0)
     safe_yaml (1.0.5)
-    sassc (2.4.0)
-      ffi (~> 1.9)
-    terminal-table (2.0.0)
-      unicode-display_width (~> 1.1, >= 1.1.1)
-    unicode-display_width (1.8.0)
+    sass-embedded (1.69.5-aarch64-linux-gnu)
+      google-protobuf (~> 3.23)
+    sass-embedded (1.69.5-arm64-darwin)
+      google-protobuf (~> 3.23)
+    sass-embedded (1.69.5-x86_64-darwin)
+      google-protobuf (~> 3.23)
+    sass-embedded (1.69.5-x86_64-linux-gnu)
+      google-protobuf (~> 3.23)
+    strscan (3.1.0)
+    terminal-table (3.0.2)
+      unicode-display_width (>= 1.1.1, < 3)
+    unicode-display_width (2.5.0)
     webrick (1.7.0)
 
 PLATFORMS

_data/authors.yml

@@ -52,7 +52,7 @@ c_chaplin:
 c_cousin:
   name: Camille Cousin
 c_goffoy:
-  name: Cédric Goffoy  
+  name: Cédric Goffoy
 c_niel:
   name: Camille Niel
   url: https://www.camilleniel.com/
@@ -165,6 +165,8 @@ m_blanc:
   name: Maxime Blanc
   avatar: /images/avatar/m_blanc.jpeg
   url: https://maximeblanc.fr
+m_millet:
+  name: Morgan Millet
 m_mure:
   name: Mathieu Mure
   url: https://twitter.com/mathieumure
@@ -182,6 +184,9 @@ m_schneider:
   avatar: /images/avatar/m_schneider.png
 n_alscher:
   name: Nicolas Alscher
+n_boiron:
+  name: Nathan Boiron
+  url: https://mopolo.dev
 n_galais:
   name: Nicolas Galais
 n_saby:
@@ -264,6 +269,7 @@ t_falconnet:
   avatar: /images/avatar/t_falconnet.jpg
 t_geindre:
   name: Thierry Geindre
+  url: https://github.com/t-geindre/
 t_gianella:
   name: Théo Gianella
 t_jarrand:
@@ -282,6 +288,8 @@ v_gallissot:
 v_pelus:
   name: Valentin Pelus
   url: https://github.com/valentinpelus
+y_chauvel:
+  name: Yann Chauvel
 y_clauss:
   name: Yves Clauss
   avatar: /images/avatar/y_clauss.png

_posts/2024-07-18-gophercon-eu-berlin-2024.md

@@ -0,0 +1,235 @@
+---
+layout: post
+title: Bedrock GopherCon Berlin 2024
+description: The 2024 GopherCon Europe took place in Berlin. Four of us had the opportunity to take part in the event in-person while others could attend the talks virtually.
+author: [k_phan, m_millet, n_boiron, pa_bedu, t_geindre, y_chauvel]
+tags: [golang, opensource, community, conference, 2024]
+color: rgb(251,87,66)
+thumbnail: "/images/posts/2024-07-18-gophercon-eu-berlin-2024/thumbnail.png"
+---
+
+The 2024 GopherCon Europe took place in Berlin. Four of us had the opportunity to take part in the event in-person while
+others could attend the talks virtually.
+
+# Talks
+
+## The Business of Go - Cameron Balahan Go Product Manager
+
+Cameron Balahan, a Product Manager at the Golang Team, kicked off GopherCon 2024 with a compelling talk on the business
+side of Go. He shared insights into the strategic decisions that shape the development of the Go language, emphasizing
+the importance of balancing innovation with stability to meet the needs of both enterprise users and the broader
+developer community.
+
+![Business of Go, developpers stack in 2024](/images/posts/2024-07-18-gophercon-eu-berlin-2024/01-the-business-of-go-01.png)
+![Business of Go, growth in open source contribution leads to growth in adoption](/images/posts/2024-07-18-gophercon-eu-berlin-2024/02-the-business-of-go-02.png)
+
+## Memory Optimization - Diana Shevchenko
+
+Diana Shevchenko from Datadog delivered an enlightening session on memory management in Go, particularly focusing on how
+data on the heap is stored in chunks known as `mspans`. She highlighted the benefits of this approach, such as efficient
+memory access and CPU cache optimization, while also discussing potential pitfalls like logical grouping and code
+readability challenges.
+
+### Key Takeaways:
+ - **Benefits**: Efficient memory access, CPU cache optimization.
+ - **Challenges**: Logical grouping, code readability, versioning, and backward compatibility.
+
+## Domain Driven Design - Robert Laszcak
+
+Robert, a principal engineer, shared valuable insights on simplifying Go projects using Domain-Driven Design (DDD). He
+highlighted a recurring challenge: project complexity. Both accidental complexity, stemming from over-engineering, and
+essential complexity, inherent in each feature, were identified as major hurdles. Ignoring essential complexity often
+leads to increased accidental complexity, making projects cumbersome and prone to becoming legacy systems quickly.
+
+![DDD, don't need it yet ?](/images/posts/2024-07-18-gophercon-eu-berlin-2024/03-ddd-01.png)
+
+To illustrate the problem, the engineer introduced a fictional company, Bing Mate, which developed an API for issuing
+invoices and processing payments. Initially, the company delivered new features weekly. However, a year later, despite
+maintaining a healthy codebase, they struggled to implement similar features promptly, triggering concerns about their
+productivity.
+
+### The Initial Solution: Microservices and Kubernetes
+
+Bing Mate attempted to solve their issue by hiring more developers and transitioning from a monolithic application to a
+microservices architecture on Kubernetes. Despite achieving the ideal Kubernetes setup, they still faced slow software
+delivery. This led to a realization that the complexity of their microservices architecture might be the root cause.
+
+In this Fake company, Emily conducted an investigation. She discovered that Bing Mate had split their monolithic
+application by database tables, resulting in closely related services that increased complexity. The solution proposed
+was to merge these related services into a more cohesive microservice, or a "micro-monolith", reducing the need for
+extensive inter-service communication. To manage the complexity of this new service, Domain-Driven Design (DDD) was
+introduced.
+
+### Key DDD Patterns To Take Home
+
+1. Always Keep Valid State in Memory:
+The first pattern emphasizes maintaining valid state within the application. By encapsulating the state and ensuring
+that only valid data can be instantiated, the integrity of the application is preserved. This is achieved by using
+private properties and constructors that enforce validation rules, ensuring that no invalid state can exist in memory.
+
+2. Keep Domain Database-Agnostic:
+The second pattern involves separating domain logic from database logic. By using the repository pattern, interactions
+with the database are abstracted, allowing the domain logic to remain clean and focused on business rules. This
+separation not only makes the code more maintainable but also facilitates testing and potential database changes in the
+future.
+
+3. Reflect Business Logic in Code:
+The third pattern advocates for aligning code with business terminology. By using the same language and terms that
+business stakeholders use, the code becomes more readable and understandable for non-technical team members. This
+alignment enhances communication and ensures that the software accurately represents business requirements.
+
+### Conclusion
+
+While these patterns provide a solid starting point, they represent just a fraction of what DDD offers. Domain-Driven
+Design encompasses a wide array of techniques that address various aspects of software development, from architecture to
+requirement gathering. By integrating these patterns into their projects, developers can create more maintainable and
+scalable systems, ultimately leading to more efficient software delivery.
+
+![Github wild-workouts-go-ddd-example repository for DDD example application in GO](/images/posts/2024-07-18-gophercon-eu-berlin-2024/04-ddd-02.png)
+
+The engineer concluded the talk by emphasizing the importance of understanding and utilizing DDD, especially in complex
+projects. They also provided materials and resources for further learning, encouraging developers to explore and
+implement DDD in their own projects.
+
+## DB Connection Pool - Agniva De Sarker
+
+Agniva De Sarker of Mattermost delivered a detailed presentation on the intricacies of database connection pooling in Go.
+
+He emphasized the importance of using an efficient database schema for logical database operations and discussed the
+limitations of pgbouncer. Agniva highlighted that the ideal solution is a single pool serving multiple requests,
+although Mattermost itself is not designed to be multi-tenant.
+
+### Highlights
+
+ - **Key Concepts**: Efficient database schema, pgbouncer.
+ - **Project**: Mattermost's Perseus project was discontinued due to security concerns.
+ - **Resource**: [Mattermost Perseus Project](https://github.com/mattermost/perseus)
+
+Agniva's insights into database connection pooling underscored the importance of an efficiently designed database
+schema, which defines how data is logically organized within a relational database. This includes logical constraints
+such as table names, fields, data types, and the relationships between these entities, all crucial for optimal
+performance and scalability in Go applications.
+
+![DB connection pool, DB hierarchy](/images/posts/2024-07-18-gophercon-eu-berlin-2024/05-db-connection-pool-01.png)
+![DB connection pool, ideal scenario](/images/posts/2024-07-18-gophercon-eu-berlin-2024/06-db-connection-pool-02.png)
+![DB connection pool, github.com/mattermost/perseus](/images/posts/2024-07-18-gophercon-eu-berlin-2024/07-db-connection-pool-03.png)
+
+## AI Application in Go - Travis Cline
+
+Travis Cline introduced `LangChainGo`, a library designed to integrate Go with the generative AI ecosystem. This library
+simplifies writing LLM-based programs in Go, supporting various models like `ChatGPT`. Travis outlined current
+capabilities and future plans for LangChainGo, including core simplification, advanced agent support, and deeper
+integration with tools like `LangSmith`.
+
+### Capabilities
+
+ - Structured Output
+ - Tool Calling
+ - Vector Database (Sequoia)
+
+### Future Plans
+
+ - Core Simplification
+ - Documentation
+ - Advanced Agent Support
+ - Deeper Integration
+
+![Generative AI Ecosystem: Major Suppliers](/images/posts/2024-07-18-gophercon-eu-berlin-2024/08-ai-app-in-go-01.png)
+![Generative AI Ecosystem: Infrastructure Stack](/images/posts/2024-07-18-gophercon-eu-berlin-2024/09-ai-app-in-go-02.png)
+![LangchainGO: Using LangchainGo](/images/posts/2024-07-18-gophercon-eu-berlin-2024/10-ai-app-in-go-04.png)
+
+## Concurrent Go - Raghav Roy
+
+Raghav Roy introduced the `TLA+` specification language, a formal method for verifying distributed and concurrent systems.
+
+He demonstrated how TLA+ can be used to model and verify concurrent Go programs, ensuring that they are free from unexpected behaviors.
+
+![TLA+ Definition](/images/posts/2024-07-18-gophercon-eu-berlin-2024/11-concurrent-go-01.png)
+
+## Technical Docs - Hila Fish
+
+Hila Fish provided a comprehensive guide on creating effective technical documentation. She stressed the importance of
+various document types, including system design briefs, on-call runbooks, and project planning documents. Hila also
+discussed the benefits of thorough documentation, such as reducing work volume and enabling self-service, thereby
+increasing developer velocity.
+
+### Documentation Types
+
+ - System Logical Design/Brief
+ - On-Call Runbooks
+ - Code README
+ - Onboarding Docs
+ - Project Planning Docs
+ - Docs as Code
+ - Slack Pinned Messages
+ - Slack bot
+
+### General Guidelines
+
+ 1. **Know Your Audience**: Tailor documentation for internal maintainers or external users. Make sure people understand it
+ 2. **Decide/Abide by Documentation Type**: Use markdown for docs as code, integrate diagrams, and ensure CI/CD validations.
+
+![Your code is now no more self documented](/images/posts/2024-07-18-gophercon-eu-berlin-2024/18-documentation-01.png)
+
+Her tips aim to have a well-documented code and not a self-documented one. She recommends that we should not feel forced
+to write everything but at least documente whatever we can and keep it simple.
+
+Below are some of the suggested links shared to help us:
+1. [Go Official Style Guide](https://go.dev/blog/godoc)
+2. [Google Style Guide](https://google.github.io/styleguide/go/)
+3. [Technical Writing Tips](https://docs.google.com/document/u/0/d/1naq4pq0otqb78hkQ8enJBLd_yHqLeMC93fFJAnaK0Rc/mobilebasic) by Hila Fish
+
+## Frames & Pointers - Felix Geisendörfer
+
+Felix Geisendörfer's session focused on performance profiling and tracing tools in Go, including pprof, frame pointers,
+and various tracing utilities like Gotraceui and Traceutils. He demonstrated how these tools can help developers
+understand and optimize their Go applications.
+
+### Tools Highlighted
+
+ - pprof
+ - Frame Pointers
+ - Gotraceui
+ - Traceutils
+
+![Frames and pointer - tracing](/images/posts/2024-07-18-gophercon-eu-berlin-2024/13-frames-and-pointers-01.png)
+![Frames and pointer - Execution Tracer Data](/images/posts/2024-07-18-gophercon-eu-berlin-2024/14-frames-and-pointers-02.png)
+![Frames and pointer - Why is this a big deal?](/images/posts/2024-07-18-gophercon-eu-berlin-2024/15-frames-and-pointers-03.png)
+
+## Securing Containers - Zvonimir Pavlinovic
+
+Zvonimir Pavlinovic discussed container security, introducing `govulncheck`, a vulnerability scanning tool developed by
+the Go team. He presented data on vulnerability findings in containers and discussed the capabilities of `Scalibr`, a
+software composition analysis library that works across different types of binaries.
+
+### Key Points
+
+ - **Tool**: govulncheck
+ - **Vulnerability** Findings: Detected symbols in 54% of containers, mostly Go vulnerabilities.
+ - **Library**: Scalibr, supports various binary types.
+
+### Resources
+
+ - [govulncheck](https://go.dev/doc/security/vuln/)
+ - [Scalibr](https://github.com/google/osv-scalibr)
+
+## Anti Patterns - Rabieh Fashwall
+
+Rabieh proposes some good practices:
+
+- when using generics is relevant
+- that can be resumed in “don’t reinvent the wheel” i.e. use native go functions instead of homemade code can have
+  impact on performances. He shares simple examples and validates them with simple benchmarks.
+
+![Antipattern](/images/posts/2024-07-18-gophercon-eu-berlin-2024/16-anti-patterns-01.png)
+![Antipattern - Error Handling](/images/posts/2024-07-18-gophercon-eu-berlin-2024/17-anti-patterns-02.png)
+
+# Conclusion
+
+These two days were a great chance to meet people involved in the language's development and learn more about a wide
+range of topics related to the Go language. Because the event was so well-organized, we were able to exchange in general
+benevolence with a large number of GO users.
+
+Our only regret is the somewhat short duration of the talks, which occasionally prevented us from digging deeper into
+certain subjects and the lack of a Q&A period with the speakers at the conclusion of their presentation though you can
+still ask them questions all along the event.