cloudfit-provider-gcp 0.1.0

GCP Compute Engine provider plugin for cloudfit-core

cloudfit-provider-gcp

GCP Compute Engine provider plugin for cloudfit-core.

Fetches machine types, pricing, and availability from the GCP Compute Engine API and normalizes them into MachineType objects that cloudfit-core understands.

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Installation

pip install cloudfit-provider-gcp

Requires Python 3.9+ and cloudfit-core>=0.1.0.

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Authentication

Uses Application Default Credentials. Set up once with:

gcloud auth application-default login

Or set the GOOGLE_APPLICATION_CREDENTIALS environment variable to a service account key path. In production (Cloud Run, GKE), credentials are picked up automatically from the instance metadata server — no configuration needed.

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Quick start

from cloudfit_provider_gcp import GCPProvider
from cloudfit import rank, WorkloadProfile

# initialize — no credentials needed if ADC is configured
provider = GCPProvider(project_id="your-gcp-project")

# fetch all machine types for a region
instances = provider.fetch_instances(region="us-central1")
print(f"fetched {len(instances)} machine types")

# plug directly into cloudfit-core
profile = WorkloadProfile(
    vcpu=60,
    ram_gb=224,
    workload="io-intensive",
    archetype="io",
    optimize_for="balanced",
)

results = rank(profile, instances)
for r in results[:3]:
    print(f"{r.instance.id:35s}  score={r.score:.2f}  ${r.instance.price_hr:.2f}/hr")

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Fetching multiple regions

from cloudfit_provider_gcp import GCPProvider

provider = GCPProvider(project_id="your-gcp-project")

regions = ["us-central1", "us-east1", "europe-west1", "asia-east1"]
all_instances = []
for region in regions:
    all_instances.extend(provider.fetch_instances(region=region))

print(f"total: {len(all_instances)} machine types across {len(regions)} regions")

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Examples

Runnable scripts are in examples/:

Script	Needs GCP credentials?	What it shows
recommend.py	yes (ADC)	live GCPProvider.fetch_instances() → cloudfit.rank()
recommend_offline.py	no	recorded fixture → normalize_machine_type() → cloudfit.rank()

Try the offline one first — it runs anywhere, no GCP account required:

python examples/recommend_offline.py

Ranking for 32 vCPU / 120 GB (optimize_for=balanced):

  ok  c3d-standard-60-lssd      score=0.96  $  2.87/hr  [active]
  ok  c2-standard-60            score=0.95  $  2.82/hr  [active]
  ok  n2-standard-32            score=0.82  $  1.53/hr  [active]
  --  a2-highgpu-1g             $  0.73/hr  [active]  ✗ RAM 85.0 GB < required 120.0 GB
  --  n1-standard-8             $  0.37/hr  [deprecated]  ✗ RAM 30.0 GB < required 120.0 GB
  --  f1-micro                  $  0.03/hr  [tombstoned]  ✗ RAM 0.6 GB < required 120.0 GB

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Pricing

Pricing is fetched from the GCP Cloud Billing Catalog API. Prices are on-demand (no committed-use or spot discount), reconstructed per instance from each family's vCPU and RAM SKU rates. If a family's SKUs can't be matched, price_hr falls back to 0.0 and the instance is still scored (its cost_score is just 0).

price_hr = provider.get_pricing("n2-standard-32", region="us-central1")
# → 1.5468

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Cron / scheduled refresh

For production use, run the fetcher on a daily schedule and write results to the cloudfit registry store (PostgreSQL). The recommended pattern is a Cloud Scheduler trigger invoking a Cloud Run Job.

from cloudfit_provider_gcp import GCPProvider
from cloudfit_provider_gcp.registry import write_to_registry

provider = GCPProvider(project_id="your-gcp-project")
instances = provider.fetch_instances_all_regions()
write_to_registry(instances, database_url=os.environ["DATABASE_URL"])

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Deprecation handling

When GCP marks a machine type as deprecated, the provider sets status="deprecated" on the MachineType. When a type is fully removed, it becomes status="tombstoned" — it is never deleted from the registry, so existing configs can warn instead of silently breaking.

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Repository structure

cloudfit-provider-gcp/
├── README.md
├── CONTRIBUTING.md
├── CITATION.cff
├── pyproject.toml
├── LICENSE
├── .gitignore
│
├── cloudfit_provider_gcp/
│   ├── __init__.py          # exports GCPProvider
│   ├── provider.py          # GCPProvider — implements Provider base class
│   ├── normalizer.py        # raw GCP API response → MachineType
│   ├── pricing.py           # Cloud Billing Catalog API → price_hr
│   ├── regions.py           # GCP region list + helpers
│   └── registry.py          # write normalized instances to PostgreSQL
│
├── examples/
│   ├── recommend.py         # live fetch → rank (needs GCP credentials)
│   └── recommend_offline.py # fixture → rank (no credentials needed)
│
└── tests/
    ├── test_normalizer.py   # unit tests — no API calls needed
    ├── test_regions.py
    └── fixtures/
        └── machine_type_response.json   # recorded GCP API response

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Related projects

• cloudfit-core — scoring engine
• cloudfit-provider-aws — AWS provider (coming soon)
• samplesheet-parser — Illumina SampleSheet parser

License

Apache 2.0 — see LICENSE.

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_{Author: Chaitanya Krishna Kasaraneni  ·  Google Scholar  ·  ORCID 0000-0001-5792-1095}