@@ -2,19 +2,50 @@ package config
22
33import (
44 "crypto/ecdsa"
5+ "encoding/json"
56 "fantom-api-graphql/internal/types"
67 "flag"
78 "fmt"
89 "github.com/ethereum/go-ethereum/common"
910 "github.com/ethereum/go-ethereum/crypto"
1011 "github.com/mitchellh/mapstructure"
1112 "github.com/spf13/viper"
13+ "io/ioutil"
1214 "log"
15+ "os"
1316 "reflect"
1417)
1518
1619// Load provides a loaded configuration for Fantom API server.
1720func Load () (* Config , error ) {
21+ // Get the config reader
22+ cfg , err := readConfigFile ()
23+ if err != nil {
24+ return nil , err
25+ }
26+
27+ // prep the container and try to unmarshal
28+ // the config file into the config structure
29+ var config Config
30+ if err = cfg .Unmarshal (& config , setupConfigUnmarshaler ); err != nil {
31+ log .Println ("can not extract API server configuration" )
32+ log .Println (err .Error ())
33+ return nil , err
34+ }
35+
36+ // try to load the logo map file
37+ loadErc20LogMap (& config )
38+
39+ // return the final config
40+ return & config , nil
41+ }
42+
43+ // readConfigFile reads the config file and provides instance
44+ // of the loaded configuration.
45+ func readConfigFile () (* viper.Viper , error ) {
46+ // inform about tokens loading
47+ log .Printf ("loading app configuration" )
48+
1849 // Get the config reader
1950 cfg := reader ()
2051
@@ -23,27 +54,56 @@ func Load() (*Config, error) {
2354
2455 // Try to read the file
2556 if err := cfg .ReadInConfig (); err != nil {
26- if _ , ok := err .(viper.ConfigFileNotFoundError ); ok {
27- // Config file not found; ignore the error, we may not need the config file
28- log .Print ("configuration file not found, using default values" )
29- } else {
57+ // is this an error notifying missing config file?
58+ if _ , ok := err .(viper.ConfigFileNotFoundError ); ! ok {
3059 // Config file was found but another error was produced
3160 log .Printf ("can not read the server configuration" )
3261 return nil , err
3362 }
63+
64+ // Config file not found; ignore the error, we may not need the config file
65+ log .Print ("configuration file not found, using default values" )
3466 }
3567
36- // prep the container and try to unmarshal
37- // the config file into the config structure
38- var config Config
39- err := cfg .Unmarshal (& config , setupConfigUnmarshaler )
68+ return cfg , nil
69+ }
70+
71+ // loadErc20LogMap loads the map of ERC20 token logos.
72+ func loadErc20LogMap (cfg * Config ) {
73+ // is there any path at all?
74+ if cfg .TokenLogoFilePath == "" {
75+ log .Print ("ERC20 tokens map file path not available" )
76+ return
77+ }
78+
79+ // try to open the file
80+ f , err := os .Open (cfg .TokenLogoFilePath )
4081 if err != nil {
41- log .Println ("can not extract API server configuration" )
42- log .Println (err .Error ())
43- return nil , err
82+ log .Printf ("can not open ERC20 tokens map file; %s" , err .Error ())
83+ return
4484 }
4585
46- return & config , nil
86+ // make sure to close the file
87+ defer f .Close ()
88+
89+ // inform about tokens loading
90+ log .Printf ("loading ERC20 tokens from %s" , cfg .TokenLogoFilePath )
91+
92+ // read the whole file
93+ data , err := ioutil .ReadAll (f )
94+ if err != nil {
95+ log .Printf ("can not read ERC20 tokens map file; %s" , err .Error ())
96+ return
97+ }
98+
99+ // try to unmarshal the data
100+ if err := json .Unmarshal (data , & cfg .TokenLogo ); err != nil {
101+ log .Printf ("can not decode ERC20 tokens map file; %s" , err .Error ())
102+ return
103+ }
104+
105+ // inform about tokens
106+ log .Printf ("found %d ERC20 tokens" , len (cfg .TokenLogo ))
47107}
48108
49109// setupConfigUnmarshaler configures the Config loader to properly unmarshal
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