Category: General

Quality analysis of dapps: Just like cloud apps?

Looking into a possible post-cloud world, we see mentions of different computing paradigms, many of them based on decentralised structures to overcome scalability and user control limitations. Among them is blockchain-as-a-service (BCaaS or BaaS), mimicking the platform-as-a-service (PaaS) user experience for both application providers and consumers. In PaaS, providers first sign up and subscribe to the platform, then design and build their applications and deploy them to the platform where it is executing either permanently or upon incoming network requests or other event triggers. Additionally, developers may advertise their apps at technology-specific hubs such as AWS SAR or Helm Hub. Consumers then adhere to the application terms, which might require a sign-up at the provider site, before being able to invoke and make use of the application.

Continue reading

Cyclops 3.1.0 is here!

We are announcing the latest release of the open source Cyclops framework, as part of our ongoing work to advance metering and monetization across cloud platforms, bringing improvements and new capabilities:

  • Improved error-handling
  • More meaningful logs, now able to identify errors more effectively and provide more information on generated records
  • Rule checkpointing, with the ability to roll coin rules back using git versioning and re-create affected records
Continue reading

Serverless plumbing: Connecting a Nextcloud file store to Knative

In a previous post, we showed how it’s possible to trigger a Knative service when a database update occurs using the Debezium Kafka Connect plug-in connected to Knative; here, we continue this work by describing how we connected a Nextcloud file storage service to Knative, triggering a Knative service/function when a file is uploaded to Nextcloud.

Serverless Platform with Database and Filestore integration
Continue reading

Serverless Plumbing: Streaming MySQL Events to Knative Services

In previous blog posts – here and here – we showed  how to set up OpenWhisk and deploy a sample application on the platform. We also provided a comparison between the two open-source serverless platforms OpenWhisk and Knative in this blog post. In progressing this work, we shifted focus slightly to that other critical component of realistic serverless platforms, the services that they integrate with – so-called Backend-as-a-service – which are (arguably) more important. For this reason, in this blog post we look at how to integrate widely used databases with Knative and potentially OpenWhisk in future.

Our initial thoughts were to leverage database trigger mechanisms and write components which would listen to these events and publish them to a Kafka bus. Indeed, we started to write code that targeted PostgreSQL to do just that, but then we came across the Debezium project which essentially solves the same problem, albeit not in the same context, but with a much more mature codebase and support for multiple database systems. It didn’t make sense to reinvent the wheel so the objective then turned into how to best integrate Debezium with Knative.

Figure 1: Architecture diagram
Continue reading

EclipseCon’18 France – Recap

SPLab was present at EclipseCon’18 France which was held on June 13-14 2018 in Toulouse, home of the Airbus Corporation. The hands-on sessions, keynote talks, the demo booth, the people who attended the 2 -day event made it really worthwhile to attend.

Continue reading