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Move jq subprocess code into cli package
Signed-off-by: Josh Dolitsky <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
| package cli | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/json" | ||
| "io" | ||
| "os" | ||
| "os/exec" | ||
|
|
||
| "github.com/hashicorp/hcl/v2/hclwrite" | ||
| "github.com/jdolitsky/tq/pkg/tq" | ||
| ) | ||
|
|
||
| // Query does the following: | ||
| // 1. Converts incoming Terraform bytes to JSON | ||
| // 2. Runs it through jq (via subprocess) to apply the query | ||
| // 3. Converts it back to Terraform (Note: if this fails, just return the JSON) | ||
| func Query(query string, in []byte) ([]byte, error) { | ||
| // Convert original input to JSON | ||
| tfFile, err := tq.ParseTerraform(in) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| jb, err := json.Marshal(tfFile) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| // Run jq directly, passing the parsed JSON as STDIN | ||
| cmd := exec.Command("jq", "-r", query) | ||
| var jqbuff bytes.Buffer | ||
| cmd.Stdout = &jqbuff | ||
| cmd.Stderr = os.Stderr | ||
| stdin, err := cmd.StdinPipe() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| if err := cmd.Start(); err != nil { | ||
| return nil, err | ||
| } | ||
| if _, err := io.WriteString(stdin, string(jb)); err != nil { | ||
| return nil, err | ||
| } | ||
| stdin.Close() | ||
| if err := cmd.Wait(); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| // Now attempt to convert it back to tf | ||
| jqb := jqbuff.Bytes() | ||
| file, err := tq.ParseJSON(jqb) | ||
| if err != nil { | ||
| // TODO: add option to fail here | ||
| // If there was some issue converting back to terraform, | ||
| // just print out the JSON (assume what the user wants here) | ||
| return jqb, nil | ||
| } | ||
| tfb := hclwrite.Format(file.Bytes()) | ||
| if tfb == nil { | ||
| // TODO: add option to fail here | ||
| // Like above, maybe we somehow passed conversion, but | ||
| // the result is empty. Return the jq raw output. | ||
| return jqb, nil | ||
| } | ||
|
|
||
| return tfb, nil | ||
| } |
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