cmd/server: read env variables for data filepaths

Author: adamdecaf

README.md

@@ -15,6 +15,13 @@ Package `github.com/moov-io/fed` implements utility services for searching the U
 Go library
 github.com/moov-io/fed offers a Go based search for FEDACH and FEDWIRE Participants.
 
+### Configuration
+
+| Environmental Variable | Description | Default |
+|-----|-----|-----|
+| `FEDACH_DATA_PATH` | Filepath to FEDACH data file | `./data/FedACHdir.txt` |
+| `FEDWIRE_DATA_PATH` | Filepath to FedWIRE data file | `./data/fpddir.txt` |
+
 ## FedWire and FedACH data from the Federal Reserve Bank Services
 
 The data and formats in this repository represent a compilation of the **FedWire** and **FedACH** data from the [Federal Reserve Bank Services site](https://frbservices.org/).
@@ -35,7 +42,7 @@ The data and formats in this repository represent a compilation of the **FedWire
 
 (c) Federal Reserve Banks
 
-By accessing the [data](./data/) in this repository you agree to the [Federal Reserve Banks' Terms of Use](https://frbservices.org/terms/index.html) and the [E-Payments Routing Directory Terms of Use Agreement](https://www.frbservices.org/EPaymentsDirectory/agreement.html).  
+By accessing the [data](./data/) in this repository you agree to the [Federal Reserve Banks' Terms of Use](https://frbservices.org/terms/index.html) and the [E-Payments Routing Directory Terms of Use Agreement](https://www.frbservices.org/EPaymentsDirectory/agreement.html).
 
 ## Disclaimer
 

cmd/server/reader.go

@@ -7,14 +7,28 @@ import (
 	"github.com/moov-io/fed"
 )
 
+var (
+	fedACHDataFilepath  = os.Getenv("FEDACH_DATA_PATH")
+	fedWIREDataFilepath = os.Getenv("FEDWIRE_DATA_PATH")
+)
+
+func init() {
+	if fedACHDataFilepath == "" {
+		fedACHDataFilepath = "./data/FedACHdir.txt"
+	}
+	if fedWIREDataFilepath == "" {
+		fedWIREDataFilepath = "./data/fpddir.txt"
+	}
+}
+
 // readFEDACHData opens and reads FedACHdir.txt then runs ACHDictionary.Read() to
 // parse and define ACHDictionary properties
 func (s *searcher) readFEDACHData() error {
 	if s.logger != nil {
 		s.logger.Log("read", "Read of FED data")
 	}
 
-	f, err := os.Open("./data/FedACHdir.txt")
+	f, err := os.Open(fedACHDataFilepath)
 	if err != nil {
 		return fmt.Errorf("ERROR: opening FedACHdir.txt %v", err)
 	}
@@ -39,7 +53,7 @@ func (s *searcher) readFEDWIREData() error {
 		s.logger.Log("read", "Read of FED data")
 	}
 
-	f, err := os.Open("./data/fpddir.txt")
+	f, err := os.Open(fedWIREDataFilepath)
 	if err != nil {
 		return fmt.Errorf("ERROR: opening fpddir.txt %v", err)
 	}