I am porting a Grails 3.1 library for using some internal webservices to Grails 4.0. One of the services provides an image of a requested employee upon request. I am having difficulty implementing the (micronaut) HttpClient code to process the request - specifically to get a proper byte[] that is the returned image.
A simple curl command on the command line works with the service:
curl -D headers.txt -H 'Authorization:Basic <encodedKeyHere>' https:<serviceUrl> >> image.jpg
and the image is correct. The header.txt is:
HTTP/1.1 200
content-type: image/jpeg;charset=UTF-8
date: Tue, 27 Aug 2019 20:05:43 GMT
x-ratelimit-limit: 100
X-RateLimit-Limit: 100
X-RateLimit-Remaining: 99
x-ratelimit-remaining: 99
X-RateLimit-Reset: 38089
x-ratelimit-reset: 15719
Content-Length: 11918
Connection: keep-alive
The old library uses the groovyx.net.http.HTTPBuilder and simply does:
http.request(Method.GET, ContentType.BINARY) {
uri.path = photoUrlPath
uri.query = queryString
headers.'Authorization' = "Basic $encoded".toString()
response.success = { resp, inputstream ->
log.info "response status: ${resp.statusLine}"
return ['status':resp.status, 'body':inputstream.getBytes()]
}
response.failure = { resp ->
return ['status':resp.status,
'error':resp.statusLine.reasonPhrase,
body:resp.getEntity().getContent().getText()]
}
}
so returning the bytes from an inputStream. This works.
I've tried several things using the micronaut HttpClient, both with the low level API and with the declarative API.
A simple example with the declarative API:
@Get(value='${photo.ws.pathurl}', produces = MediaType.IMAGE_JPEG)
HttpResponse<byte[]> getPhoto(@Header ('Authorization') String authValue,
@QueryValue("emplId") String emplId)
And than in the Service:
HttpResponse<byte[]> resp = photoClient.getPhoto(getBasicAuth(),emplId)
def status = resp.status() // code == 200 --> worked
def bodyStrOne = resp.getBody() // nope: get Optional.empty
// Tried different getBody(class) -> Can't figure out where the byte[]s are
// For example can do:
def buf = resp.getBody(io.netty.buffer.ByteBuf).value // Why need .value?
def bytes = buf.readableBytes() // Returns 11918 --> the expected value
byte[] ans = new byte[buf.readableBytes()]
buf.readBytes(ans) // Throws exception: io.netty.util.IllegalReferenceCountException: refCnt: 0
This "works" but the returned String looses some encoding that I can't reverse:
// Client - use HttpResponse<String>
@Get(value='${photo.ws.pathurl}', produces = MediaType.IMAGE_JPEG)
HttpResponse<String> getPhoto(@Header ('Authorization') String authValue,
@QueryValue("emplId") String emplId)
// Service
HttpResponse<String> respOne = photoClient.getPhoto(getBasicAuth(),emplId)
def status = respOne.status() // code == 200 --> worked
def bodyStrOne = respOne.getBody(String.class) // <-- RETURNS DATA..just NOT an Image..or encoded or something
String str = bodyStrOne.value // get the String data
// But these bytes aren't correct
byte[] ans = str.getBytes() // NOT an image..close but not.
// str.getBytes(StandardCharsets.UTF_8) or any other charset doesn't work
Everything I've tried with the ByteBuf classes throws the io.netty.util.IllegalReferenceCountException: refCnt: 0 exception.
Any direction/help would be greatly appreciated.
Running:
Grails 4.0
JDK 1.8.0_221
Groovy 2.4.7
Windows 10
IntellJ 2019.2
