DRPC LogsOracle

It's a cache answering the question "how many logs will be in the request to the node".

LogsOracle consists of several components:

• liboracle: a kernel written in C
• liboracle.go: a Go library implemented through cgo
• LogsOracle.java: Java library implemented via JEP 424
• doracle: RPC webserver providing a custom methods for estimating log counts and indexer nodes.

System Requirements:

• 64-bit architecture, AVX2/3 will give a good performance boost;
• RAM >=16GB, latency is proportional to the amount of memory;
• SSD or NVMe >=128GB, do not recommend HDD;

C API

See liboracle.h

Go API

See liboracle.go

Java API

See LogsOracle.java

Doracle - RPC webserver

Run with docker:

docker build \
  --build-arg="UID=$(id -u)" --build-arg="GID=$(id -g)" \
  -t logs-oracle .

mkdir -p -m=0600 ~/.local/share/logs-oracle # dir for storage
docker run \
  -p 8000:8000 \
  --ulimit memlock=-1:-1 \
  -v ~/.local/share/logs-oracle:/home/nonroot/data \
  -e ORACLE_DATA_DIR="/home/nonroot/data" \
  -e ORACLE_NODE_ADDR="..." \
  logs-oracle

Options

Use environment variables for configuration:

ORACLE_ENV string (default "production")
  enironment tag, 'development' or 'production'

BIND_PORT int (default ":8000")
  port to RPC server

METRICS_PORT int (default ":8001")
  port to RPC server

ACCESS_LOG bool (default "false")
  enable access logs

DATA_DIR string
  dir for save data

RAM_LIMIT string (default "16GB")
  RAM limit for disk cache

NODE_RPC string
  ethereum json rpc endpoint url

NODE_WS string
  ethereum json ws endpoint url