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6 changes: 6 additions & 0 deletions .dockerignore
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.git/
.github/
.idea
Dockerfile
proxy
README.md
31 changes: 31 additions & 0 deletions .gitignore
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# If you prefer the allow list template instead of the deny list, see community template:
# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
#
# Binaries for programs and plugins
*.exe
*.exe~
*.dll
*.so
*.dylib

# Test binary, built with `go test -c`
*.test

# Output of the go coverage tool, specifically when used with LiteIDE
*.out

# Dependency directories (remove the comment below to include it)
# vendor/

.idea

# Go workspace file
go.work

/proxy

# Ignore everything in config and logs directories except .gitkeep
/config/*
!/config/.gitkeep
/logs/*
!/logs/.gitkeep
13 changes: 13 additions & 0 deletions Dockerfile
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FROM golang:1.22.8 AS build

WORKDIR /code
COPY . .
RUN make build

FROM cgr.dev/chainguard/glibc-dynamic AS bluefin
COPY --from=build /code/proxy /bin/

VOLUME ["/data", "/config"]
WORKDIR /data
ENTRYPOINT ["/bin/proxy"]
CMD ["-config", "/config/config.yml"]
201 changes: 201 additions & 0 deletions LICENSE
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Apache License
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45 changes: 45 additions & 0 deletions Makefile
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# Determine root directory
ROOT_DIR=$(shell dirname $(realpath $(firstword $(MAKEFILE_LIST))))

# Gather all .go files for use in dependencies below
GO_FILES=$(shell find $(ROOT_DIR) -name '*.go')

# Gather list of expected binaries
BINARIES=$(shell cd $(ROOT_DIR)/cmd && ls -1 | grep -v ^common)

# Extract Go module name from go.mod
GOMODULE=$(shell grep ^module $(ROOT_DIR)/go.mod | awk '{ print $$2 }')

GO_LDFLAGS=-ldflags "-s -w"

.PHONY: build mod-tidy clean test

# Alias for building program binary
build: $(BINARIES)

mod-tidy:
# Needed to fetch new dependencies and add them to go.mod
go mod tidy

clean:
rm -f $(BINARIES)

format:
go fmt ./...

golines:
golines -w --ignore-generated --chain-split-dots --max-len=80 --reformat-tags .

test: mod-tidy
go test -v -race ./...

bench: mod-tidy
go test -v -bench=. ./...

# Build our program binaries
# Depends on GO_FILES to determine when rebuild is needed
$(BINARIES): mod-tidy $(GO_FILES)
CGO_ENABLED=0 go build \
$(GO_LDFLAGS) \
-o $(@) \
./cmd/$(@)
80 changes: 80 additions & 0 deletions README.md
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# EVM JSON RPC Cache

This program caches requests

## Caching Mechanism

1. **Cache Storage**: The server uses BigCache as the underlying cache storage mechanism, which is wrapped by the `gocache` library for easier management.

2. **Cache Key**: For each request, a unique cache key is generated based on the HTTP method and the full URL of the request.

3. **Caching Decision**: The `shouldCacheEndpoint` method determines whether a request should be cached and for how long, based on the Ethereum JSON-RPC method being called.

4. **Cached Response**: When a response is cached, it stores the entire HTTP response, including status code, headers, and body.

5. **Cache Hit**: If a cached response is found, it's immediately returned to the client without forwarding the request to the backend.

6. **Cache Miss**: If no cached response is found, the request is forwarded to the backend, and the response is then cached (if the method is cacheable).

7. **Confirmation-based Caching**: For transaction and block-related methods, the caching decision also considers the number of confirmations:
- Transaction data is cached only if the transaction has reached the required number of confirmations.
- Block data is cached for a long time if the block is considered finalized (has enough confirmations).

8. **Dynamic TTL**: Different cache TTLs (Time To Live) are set for different types of data:
- Confirmed transaction and finalized block data: 365 days (some long time)
- Gas price estimates: based on config

9. **Latest Block Tracking**: The server continuously tracks tip through wss to determine finality

# Setup


```bash
make
```

```bash
./proxy -config ./config.yml
```

## docker
```bash
docker compose up -d
```

# config

here is an example config

```yaml
server:
listenAddress: "0.0.0.0"
listenPort: 8080

backend:
url: "https://mainnet.infura.io/v3/API_KEY"

ws_backend:
url: "wss://mainnet.infura.io/ws/v3/API_KEY"

blockchain:
confirmations: 15
gasFeeTTL: 30s

logging:
level: "info"
logDirectory: "logs"
logFileName: "app.log"
maxLogFileSize: 100
maxBackups: 3
maxAge: 28

cache:
shards: 1024
lifeWindow: 10m
cleanWindow: 5m
maxEntriesInWindow: 600000
maxEntrySize: 500
verbose: false
hardMaxCacheSize: 8192
```
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