Migrate reconciler

Makefile

@@ -12,7 +12,7 @@ GOLINES_CMD=go run github.com/segmentio/golines
 GOVERALLS_CMD=go run github.com/mattn/goveralls
 
 GO_PACKAGES=./asserter/... ./fetcher/... ./types/... ./client/... ./server/... \
- ./parser/... ./syncer/...
+ ./parser/... ./syncer/... ./reconciler/...
 GO_FOLDERS=$(shell echo ${GO_PACKAGES} | sed -e "s/\.\///g" | sed -e "s/\/\.\.\.//g")
 TEST_SCRIPT=go test -v ${GO_PACKAGES}
 LINT_SETTINGS=golint,misspell,gocyclo,gocritic,whitespace,goconst,gocognit,bodyclose,unconvert,lll,unparam

fetcher/README.md

@@ -31,4 +31,3 @@ fetcher := fetcher.New(ctx, serverURL, fetcher.WithBlockConcurrency(10))
 ## More Examples
 Check out the [examples](/examples) to see how easy
 it is to connect to a Rosetta server.
-

reconciler/README.md

@@ -0,0 +1,36 @@
+# Reconciler
+
+[![GoDoc](https://img.shields.io/badge/go.dev-reference-007d9c?logo=go&logoColor=white&style=shield)](https://pkg.go.dev/github.com/coinbase/rosetta-sdk-go/reconciler?tab=doc)
+
+The Reconciler package is used to ensure that balance changes derived from
+parsing Rosetta blocks are equivalent to the balance changes computed by the
+node. If you want to see an example of how to use this package, take
+a look at [rosetta-cli](https://github.com/coinbase/rosetta-cli).
+
+## Features
+* Customizable `Helper` and `Handler` to define your own logic for retrieving
+calculated balance changes and handling successful/unsuccessful comparisons
+* Perform balance lookup at either historical blocks or the current block (if
+historical balance query is not supported)
+* Provide a list of accounts to compare at each block (for quick and easy
+debugging)
+
+## Installation
+
+```shell
+go get github.com/coinbase/rosetta-sdk-go/reconciler
+```
+
+## Reconciliation Strategies
+### Active Addresses
+The reconciler checks that the balance of an account computed by
+its operations is equal to the balance of the account according
+to the node. If this balance is not identical, the reconciler will
+error.
+
+### Inactive Addresses
+The reconciler randomly checks the balances of accounts that aren't
+involved in any transactions. The balances of accounts could change
+on the blockchain node without being included in an operation
+returned by the Rosetta Node API. Recall that all balance-changing
+operations must be returned by the Rosetta Node API.