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set logger to intercept raw request and reply data #79

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set logger to intercept raw request and reply data #79

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13 changes: 13 additions & 0 deletions graphql.go
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@ import (
"context"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"

Expand All @@ -16,6 +17,7 @@ import (
type Client struct {
url string // GraphQL server URL.
httpClient *http.Client
logger io.Writer
}

// NewClient creates a GraphQL client targeting the specified GraphQL server URL.
Expand All @@ -30,6 +32,11 @@ func NewClient(url string, httpClient *http.Client) *Client {
}
}

// SetLogger set verbose logger
func (c *Client) SetLogger(l io.Writer) {
c.logger = l
}

// Query executes a single GraphQL query request,
// with a query derived from q, populating the response into it.
// q should be a pointer to struct that corresponds to the GraphQL schema.
Expand Down Expand Up @@ -65,6 +72,9 @@ func (c *Client) do(ctx context.Context, op operationType, v interface{}, variab
if err != nil {
return err
}
if c.logger != nil {
c.logger.Write(append([]byte("request:\n\t"), buf.Bytes()...))
}
resp, err := ctxhttp.Post(ctx, c.httpClient, c.url, "application/json", &buf)
if err != nil {
return err
Expand All @@ -85,6 +95,9 @@ func (c *Client) do(ctx context.Context, op operationType, v interface{}, variab
return err
}
if out.Data != nil {
if c.logger != nil {
c.logger.Write(append([]byte("reply:\n\t"), (*out.Data)...))
}
err := jsonutil.UnmarshalGraphQL(*out.Data, v)
if err != nil {
// TODO: Consider including response body in returned error, if deemed helpful.
Expand Down