Methods implemented in this differential can be used to send data to actual blob service instance.
1. Start blob service locally.
2. put the following code somewhere in CommCoreModule:
```
std::string holder = "test.holder.v0";
std::string hash = "test.hash.v0";
auto data = {
std::string(4000000, 'a'),
std::string(4000000, 'b'),
std::string(4000000, 'c'),
std::string(4000000, 'd'),
std::string(4000000, 'e'),
std::string(4000000, 'f'),
std::string(4000000, 'g'),
};
UploadBlobClient client;
client.startUploadBlocking(holder, hash);
for (auto &chunk : data) {
client.uploadChunkBlocking((std::uint8_t *)chunk.c_str(), chunk.length());
}
client.completeUploadBlocking();
```
3. Run `aws --endpoint-url=http://localhost:4566 s3 cp s3://commapp-blob/test.hash.v0 localfile`. Then `cat localfile | wc -c` and ensure the output is 28000000.