Repository: onflow/flow-cli (go)

Issue:
Misleading Error Message On Deployment Error
### Issue To Be Solved

I was trying to deploy a contract to testnet using `flow project deploy --network=testnet`. However, I accidentally omitted the "testnet" field in my JSON structure.

I.e. the deployments section of my `flow.json` looked like:

```json
"deployments": {
    "example-account": ["ExampleContract"]
}
```
instead of:

```json
"deployments": {
    "testnet": {
        "example-account": ["ExampleContract"]
    }
}
```

However, when I ran `flow project deploy --network=testnet` I received the error:

![](https://cdn.discordapp.com/attachments/621847426201944074/882491160042561546/Screen_Shot_2021-09-01_at_1.04.32_AM.png)

However, I did have a `flow.json` in the root of my project, and so of course running `flow init` fails.

### (Optional): Suggest A Solution

This was totally my fault, the JSON that I had in my `flow.json`, while valid JSON structurally, did not contain all of the requirements that Flow CLI required. However, I think that the error message here is lacking a bit as this took a while for me to find what was going on.

I would suggest a more specific error message if Flow CLI parses the JSON for a certain attribute and does not find it, that should likely be reported, instead of reporting that the entire config file is missing.



Pull request:
Fix Config Syntax Error Handling
Closes #377 

## Description
This PR fixes loader error handling for wrong config syntax. The error was wrongly passed.

______

For contributor use:

- [x] Targeted PR against `master` branch
- [x] Linked to Github issue with discussion and accepted design OR link to spec that describes this work
- [x] Code follows the [standards mentioned here](https://github.com/onflow/flow-cli/blob/master/CONTRIBUTING.md#styleguides)
- [x] Updated relevant documentation
- [x] Re-reviewed `Files changed` in the Github PR explorer
- [x] Added appropriate labels


Patch:
diff --git a/go.mod b/go.mod
index fcede435..8ac10231 100644
--- a/go.mod
+++ b/go.mod
@@ -2,15 +2,13 @@ module github.com/onflow/flow-cli
 
 go 1.13
 
-replace github.com/onflow/cadence/languageserver => github.com/bjartek/cadence/languageserver v0.9.5-0.20210804215405-0397187261d5
-
 require (
 	github.com/a8m/envsubst v1.2.0
 	github.com/gosuri/uilive v0.0.4
 	github.com/joho/godotenv v1.3.0
 	github.com/manifoldco/promptui v0.8.0
 	github.com/onflow/cadence v0.18.1-0.20210621144040-64e6b6fb2337
-	github.com/onflow/cadence/languageserver v0.18.2
+	github.com/onflow/cadence/languageserver v0.18.3-0.20210922170423-869cc8faab9b
 	github.com/onflow/flow-core-contracts/lib/go/templates v0.6.0
 	github.com/onflow/flow-emulator v0.22.0
 	github.com/onflow/flow-go v0.18.4
diff --git a/go.sum b/go.sum
index 7380a8d3..f4bf306c 100644
--- a/go.sum
+++ b/go.sum
@@ -225,6 +225,7 @@ github.com/fatih/color v1.3.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5Kwzbycv
 github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
 github.com/fjl/memsize v0.0.0-20180418122429-ca190fb6ffbc/go.mod h1:VvhXpOYNQvB+uIk2RvXzuaQtkQJzzIx6lSBe1xv7hi0=
 github.com/flynn/go-shlex v0.0.0-20150515145356-3f9db97f8568/go.mod h1:xEzjJPgXI435gkrCt3MPfRiAkVrwSbHsst4LCFVfpJc=
+github.com/flynn/noise v0.0.0-20180327030543-2492fe189ae6/go.mod h1:1i71OnUq3iUe1ma7Lr6yG6/rjvM3emb6yoL7xLFzcVQ=
 github.com/flynn/noise v1.0.0/go.mod h1:xbMo+0i6+IGbYdJhF31t2eR1BIU0CYc12+BNAKwUTag=
 github.com/fogleman/gg v1.2.1-0.20190220221249-0403632d5b90/go.mod h1:R/bRT+9gY/C5z7JzPU0zXsXHKM4/ayA+zqcVNZzPa1k=
 github.com/francoispqt/gojay v1.2.13/go.mod h1:ehT5mTG4ua4581f1++1WLG0vPdaA9HaiDsoyrBGkyDY=
@@ -517,11 +518,13 @@ github.com/libp2p/go-libp2p v0.6.1/go.mod h1:CTFnWXogryAHjXAKEbOf1OWY+VeAP3lDMZk
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 github.com/libp2p/go-libp2p-autonat v0.1.1/go.mod h1:OXqkeGOY2xJVWKAGV2inNF5aKN/djNA3fdpCWloIudE=
 github.com/libp2p/go-libp2p-autonat v0.2.0/go.mod h1:DX+9teU4pEEoZUqR1PiMlqliONQdNbfzE1C718tcViI=
 github.com/libp2p/go-libp2p-autonat v0.2.1/go.mod h1:MWtAhV5Ko1l6QBsHQNSuM6b1sRkXrpk0/LqCr+vCVxI=
 github.com/libp2p/go-libp2p-autonat v0.2.2/go.mod h1:HsM62HkqZmHR2k1xgX34WuWDzk/nBwNHoeyyT4IWV6A=
+github.com/libp2p/go-libp2p-autonat v0.4.0/go.mod h1:YxaJlpr81FhdOv3W3BTconZPfhaYivRdf53g+S2wobk=
 github.com/libp2p/go-libp2p-autonat v0.4.2/go.mod h1:YxaJlpr81FhdOv3W3BTconZPfhaYivRdf53g+S2wobk=
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@@ -564,6 +567,7 @@ github.com/libp2p/go-libp2p-mplex v0.4.1/go.mod h1:cmy+3GfqfM1PceHTLL7zQzAAYaryD
 github.com/libp2p/go-libp2p-nat v0.0.5/go.mod h1:1qubaE5bTZMJE+E/uu2URroMbzdubFz1ChgiN79yKPE=
 github.com/libp2p/go-libp2p-nat v0.0.6/go.mod h1:iV59LVhB3IkFvS6S6sauVTSOrNEANnINbI/fkaLimiw=
 github.com/libp2p/go-libp2p-netutil v0.1.0/go.mod h1:3Qv/aDqtMLTUyQeundkKsA+YCThNdbQD54k3TqjpbFU=
+github.com/libp2p/go-libp2p-noise v0.1.1/go.mod h1:QDFLdKX7nluB7DEnlVPbz7xlLHdwHFA9HiohJRr3vwM=
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 github.com/libp2p/go-libp2p-peer v0.2.0/go.mod h1:RCffaCvUyW2CJmG2gAWVqwePwW7JMgxjsHm7+J5kjWY=
 github.com/libp2p/go-libp2p-peerstore v0.1.0/go.mod h1:2CeHkQsr8svp4fZ+Oi9ykN1HBb6u0MOvdJ7YIsmcwtY=
@@ -586,6 +590,7 @@ github.com/libp2p/go-libp2p-swarm v0.2.3/go.mod h1:P2VO/EpxRyDxtChXz/VPVXyTnszHv
 github.com/libp2p/go-libp2p-swarm v0.2.8/go.mod h1:JQKMGSth4SMqonruY0a8yjlPVIkb0mdNSwckW7OYziM=
 github.com/libp2p/go-libp2p-swarm v0.3.0/go.mod h1:hdv95GWCTmzkgeJpP+GK/9D9puJegb7H57B5hWQR5Kk=
 github.com/libp2p/go-libp2p-swarm v0.3.1/go.mod h1:hdv95GWCTmzkgeJpP+GK/9D9puJegb7H57B5hWQR5Kk=
+github.com/libp2p/go-libp2p-swarm v0.4.0/go.mod h1:XVFcO52VoLoo0eitSxNQWYq4D6sydGOweTOAjJNraCw=
 github.com/libp2p/go-libp2p-swarm v0.5.0/go.mod h1:sU9i6BoHE0Ve5SKz3y9WfKrh8dUat6JknzUehFx8xW4=
 github.com/libp2p/go-libp2p-testing v0.0.2/go.mod h1:gvchhf3FQOtBdr+eFUABet5a4MBLK8jM3V4Zghvmi+E=
 github.com/libp2p/go-libp2p-testing v0.0.3/go.mod h1:gvchhf3FQOtBdr+eFUABet5a4MBLK8jM3V4Zghvmi+E=
@@ -599,6 +604,7 @@ github.com/libp2p/go-libp2p-tls v0.1.3/go.mod h1:wZfuewxOndz5RTnCAxFliGjvYSDA40s
 github.com/libp2p/go-libp2p-transport-upgrader v0.1.1/go.mod h1:IEtA6or8JUbsV07qPW4r01GnTenLW4oi3lOPbUMGJJA=
 github.com/libp2p/go-libp2p-transport-upgrader v0.2.0/go.mod h1:mQcrHj4asu6ArfSoMuyojOdjx73Q47cYD7s5+gZOlns=
 github.com/libp2p/go-libp2p-transport-upgrader v0.3.0/go.mod h1:i+SKzbRnvXdVbU3D1dwydnTmKRPXiAR/fyvi1dXuL4o=
+github.com/libp2p/go-libp2p-transport-upgrader v0.4.0/go.mod h1:J4ko0ObtZSmgn5BX5AmegP+dK3CSnU2lMCKsSq/EY0s=
 github.com/libp2p/go-libp2p-transport-upgrader v0.4.2/go.mod h1:NR8ne1VwfreD5VIWIU62Agt/J18ekORFU/j1i2y8zvk=
 github.com/libp2p/go-libp2p-yamux v0.2.0/go.mod h1:Db2gU+XfLpm6E4rG5uGCFX6uXA8MEXOxFcRoXUODaK8=
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@@ -607,6 +613,7 @@ github.com/libp2p/go-libp2p-yamux v0.2.7/go.mod h1:X28ENrBMU/nm4I3Nx4sZ4dgjZ6VhL
 github.com/libp2p/go-libp2p-yamux v0.2.8/go.mod h1:/t6tDqeuZf0INZMTgd0WxIRbtK2EzI2h7HbFm9eAKI4=
 github.com/libp2p/go-libp2p-yamux v0.4.0/go.mod h1:+DWDjtFMzoAwYLVkNZftoucn7PelNoy5nm3tZ3/Zw30=
 github.com/libp2p/go-libp2p-yamux v0.5.0/go.mod h1:AyR8k5EzyM2QN9Bbdg6X1SkVVuqLwTGf0L4DFq9g6po=
+github.com/libp2p/go-libp2p-yamux v0.5.1/go.mod h1:dowuvDu8CRWmr0iqySMiSxK+W0iL5cMVO9S94Y6gkv4=
 github.com/libp2p/go-libp2p-yamux v0.5.4/go.mod h1:tfrXbyaTqqSU654GTvK3ocnSZL3BuHoeTSqhcel1wsE=
 github.com/libp2p/go-maddr-filter v0.0.4/go.mod h1:6eT12kSQMA9x2pvFQa+xesMKUBlj9VImZbj3B9FBH/Q=
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@@ -654,6 +661,7 @@ github.com/libp2p/go-yamux v1.3.5/go.mod h1:FGTiPvoV/3DVdgWpX+tM0OW3tsM+W5bSE3gZ
 github.com/libp2p/go-yamux v1.3.7/go.mod h1:fr7aVgmdNGJK+N1g+b6DW6VxzbRCjCOejR/hkmpooHE=
 github.com/libp2p/go-yamux v1.4.0/go.mod h1:fr7aVgmdNGJK+N1g+b6DW6VxzbRCjCOejR/hkmpooHE=
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+github.com/libp2p/go-yamux/v2 v2.0.0/go.mod h1:NVWira5+sVUIU6tu1JWvaRn1dRnG+cawOJiflsAM+7U=
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@@ -709,6 +717,7 @@ github.com/microcosm-cc/bluemonday v1.0.1/go.mod h1:hsXNsILzKxV+sX77C5b8FSuKF00v
 github.com/miekg/dns v1.0.14/go.mod h1:W1PPwlIAgtquWBMBEV9nkV9Cazfe8ScdGz/Lj7v3Nrg=
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@@ -800,12 +809,25 @@ github.com/oklog/ulid v1.3.1/go.mod h1:CirwcVhetQ6Lv90oh/F+FBtV6XMibvdAFo93nm5qn
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@@ -813,11 +835,14 @@ github.com/onflow/flow-core-contracts/lib/go/templates v0.6.0 h1:2v10ZSCE4e3TyeD
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+github.com/onflow/flow-go v0.17.1/go.mod h1:j8zCo01+2pJL00qpOnwdOqU7spTgOLHFRUp9gsamyNA=
 github.com/onflow/flow-go v0.18.0/go.mod h1:cQpvFoqth9PR7tarWDa36R/dDOqUK5QYfeYzCdXPLII=
 github.com/onflow/flow-go v0.18.2-canary/go.mod h1:mGzTPbzG1YrckrFQfjCw6NzfflP1o3TjRxI9LRWZbpc=
 github.com/onflow/flow-go v0.18.4 h1:2VHCT+e8oo5jrAYyYLdHga6in8FcbXd6tqiQjg9YPz0=
@@ -989,6 +1014,7 @@ github.com/spf13/cast v1.3.0/go.mod h1:Qx5cxh0v+4UWYiBimWS+eyWzqEqokIECu5etghLkU
 github.com/spf13/cobra v0.0.3/go.mod h1:1l0Ry5zgKvJasoi3XT1TypsSe7PqH0Sj9dhYf7v3XqQ=
 github.com/spf13/cobra v0.0.5/go.mod h1:3K3wKZymM7VvHMDS9+Akkh4K60UwM26emMESw8tLCHU=
 github.com/spf13/cobra v0.0.6/go.mod h1:/6GTrnGXV9HjY+aR4k0oJ5tcvakLuG6EuKReYlHNrgE=
+github.com/spf13/cobra v0.0.7/go.mod h1:/6GTrnGXV9HjY+aR4k0oJ5tcvakLuG6EuKReYlHNrgE=
 github.com/spf13/cobra v1.1.3 h1:xghbfqPkxzxP3C/f3n5DdpAbdKLj4ZE4BWQI362l53M=
 github.com/spf13/cobra v1.1.3/go.mod h1:pGADOWyqRD/YMrPZigI/zbliZ2wVD/23d+is3pSWzOo=
 github.com/spf13/jwalterweatherman v1.0.0 h1:XHEdyB+EcvlqZamSM4ZOMGlc93t6AcsBEu9Gc1vn7yk=
@@ -1119,6 +1145,7 @@ golang.org/x/crypto v0.0.0-20200115085410-6d4e4cb37c7d/go.mod h1:LzIPMQfyMNhhGPh
 golang.org/x/crypto v0.0.0-20200117160349-530e935923ad/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20200221231518-2aa609cf4a9d/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20200311171314-f7b00557c8c4/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
+golang.org/x/crypto v0.0.0-20200423211502-4bdfaf469ed5/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20200510223506-06a226fb4e37/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20200602180216-279210d13fed/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
diff --git a/pkg/flowkit/config/json/config.go b/pkg/flowkit/config/json/config.go
index d190e913..2f4a093e 100644
--- a/pkg/flowkit/config/json/config.go
+++ b/pkg/flowkit/config/json/config.go
@@ -20,6 +20,7 @@ package json
 
 import (
 	"encoding/json"
+	"fmt"
 
 	"github.com/onflow/flow-cli/pkg/flowkit/config"
 )
@@ -129,9 +130,8 @@ func (p *Parser) Deserialize(raw []byte) (*config.Config, error) {
 
 	var jsonConf jsonConfig
 	err := json.Unmarshal(raw, &jsonConf)
-
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("configuration syntax error: %w", err)
 	}
 
 	return jsonConf.transformToConfig()
diff --git a/pkg/flowkit/config/loader.go b/pkg/flowkit/config/loader.go
index 1fe48621..569e40ef 100644
--- a/pkg/flowkit/config/loader.go
+++ b/pkg/flowkit/config/loader.go
@@ -106,7 +106,7 @@ func (l *Loader) Save(conf *Config, path string) error {
 	return nil
 }
 
-func (l *Loader) LoadConfig(confPath string) (*Config, error) {
+func (l *Loader) loadConfig(confPath string) (*Config, error) {
 	raw, err := l.loadFile(confPath)
 
 	if err != nil {
@@ -130,12 +130,15 @@ func (l *Loader) Load(paths []string) (*Config, error) {
 	// special case for default configs
 	// try to load local config and only if not found try to load global config
 	if IsDefaultPath(paths) {
-		conf, err := l.LoadConfig(DefaultPath)
-		if err == nil {
+		conf, err := l.loadConfig(DefaultPath)
+		if err == nil { // if we could load it then process it
 			return l.postprocess(conf)
 		}
+		if !errors.Is(err, ErrDoesNotExist) {
+			return nil, err
+		}
 
-		conf, err = l.LoadConfig(GlobalPath())
+		conf, err = l.loadConfig(GlobalPath())
 		if err != nil {
 			return nil, ErrDoesNotExist
 		} else {
@@ -145,7 +148,7 @@ func (l *Loader) Load(paths []string) (*Config, error) {
 
 	var baseConf *Config
 	for _, confPath := range paths {
-		conf, err := l.LoadConfig(confPath)
+		conf, err := l.loadConfig(confPath)
 		if err != nil {
 			return nil, err
 		}
diff --git a/pkg/flowkit/state.go b/pkg/flowkit/state.go
index bbf232b2..7adc4a96 100644
--- a/pkg/flowkit/state.go
+++ b/pkg/flowkit/state.go
@@ -19,7 +19,6 @@
 package flowkit
 
 import (
-	"errors"
 	"fmt"
 	"os"
 	"path"
@@ -244,12 +243,7 @@ func Load(configFilePaths []string, readerWriter ReaderWriter) (*State, error) {
 	// here we add all available parsers (more to add yaml etc...)
 	confLoader.AddConfigParser(json.NewParser())
 	conf, err := confLoader.Load(configFilePaths)
-
 	if err != nil {
-		if errors.Is(err, config.ErrDoesNotExist) {
-			return nil, err
-		}
-
 		return nil, err
 	}
 


Test patch:
diff --git a/pkg/flowkit/config/loader_test.go b/pkg/flowkit/config/loader_test.go
index 21e9b104..15d9a0b8 100644
--- a/pkg/flowkit/config/loader_test.go
+++ b/pkg/flowkit/config/loader_test.go
@@ -148,6 +148,39 @@ func Test_PreferLocalJson(t *testing.T) {
 	)
 }
 
+func Test_MissingConfiguration(t *testing.T) {
+	composer := config.NewLoader(afero.Afero{Fs: mockFS})
+	composer.AddConfigParser(json.NewParser())
+
+	conf, err := composer.Load([]string{"flow.json"})
+
+	assert.Nil(t, conf)
+	assert.EqualError(t, err, "missing configuration")
+}
+
+func Test_ConfigurationWrongFormat(t *testing.T) {
+	b := []byte(`{
+		"deployments": {
+			"emulator-account": {
+				"address": "f8d6e0586b0a20c7",
+				"key": "21c5dfdeb0ff03a7a73ef39788563b62c89adea67bbb21ab95e5f710bd1d40b7"
+			}
+		}
+	}`)
+
+	mockFS := afero.NewMemMapFs()
+	err := afero.WriteFile(mockFS, "flow.json", b, 0644)
+
+	assert.NoError(t, err)
+
+	composer := config.NewLoader(afero.Afero{Fs: mockFS})
+	composer.AddConfigParser(json.NewParser())
+
+	conf, err := composer.Load(config.DefaultPaths())
+	assert.EqualError(t, err, "configuration syntax error: json: cannot unmarshal string into Go struct field jsonConfig.deployments of type []json.deployment")
+	assert.Nil(t, conf)
+}
+
 func Test_ComposeJSON(t *testing.T) {
 	b := []byte(`{
 		"accounts": {