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/rfid endpoint - Serve with chunked response #280

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merged 8 commits into from
Dec 29, 2023
Merged

/rfid endpoint - Serve with chunked response #280

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3e2b0f6
rfid chunked response
tueddy Dec 12, 2023
788d4ff
fixes
tueddy Dec 13, 2023
0d9c7b3
make clang check happy
tueddy Dec 13, 2023
b080121
endpoint /rfid returns tag details (as before)
tueddy Dec 14, 2023
86fa4f4
clang
tueddy Dec 14, 2023
871df02
fix error: inconsistent types 'int' and 'unsigned int' deduced for la…
tueddy Dec 14, 2023
403d2e5
nvsIndex is size_t
tueddy Dec 29, 2023
9c3b512
ids->ids-only
tueddy Dec 29, 2023
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104 changes: 82 additions & 22 deletions src/Web.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -457,6 +457,7 @@ void webserverStart(void) {

// RFID
wServer.on("/rfid", HTTP_GET, handleGetRFIDRequest);
wServer.addRewrite(new OneParamRewrite("/rfid/ids-only", "/rfid?ids-only=true"));
wServer.addHandler(new AsyncCallbackJsonWebHandler("/rfid", handlePostRFIDRequest));
wServer.addRewrite(new OneParamRewrite("/rfid/{id}", "/rfid?id={id}"));
wServer.on("/rfid", HTTP_DELETE, handleDeleteRFIDRequest);
Expand Down Expand Up @@ -1685,34 +1686,93 @@ bool DumpNvsToJSONCallback(const char *key, void *data) {
return tagIdToJSON(key, obj);
}

// callback for writing a NVS entry to list
bool DumpNvsToArrayCallback(const char *key, void *data) {
std::vector<String> *keys = (std::vector<String> *) data;
keys->push_back(key);
return true;
}

static String tagIdToJsonStr(const char *key, const bool nameOnly) {
if (nameOnly) {
return "\"" + String(key) + "\"";
} else {
StaticJsonDocument<512> doc;
JsonObject entry = doc.createNestedObject(key);
if (!tagIdToJSON(key, entry)) {
return "";
}
String serializedJsonString;
serializeJson(entry, serializedJsonString);
return serializedJsonString;
}
}

// Handles rfid-assignments requests (GET)
// /rfid returns an array of tag-ids and details. Optional GET param "id" to list only a single assignment.
// /rfid/ids-only returns an array of tag-id keys
static void handleGetRFIDRequest(AsyncWebServerRequest *request) {

String tagId = "";

if (request->hasParam("id")) {
tagId = request->getParam("id")->value();
}
if (tagId == "") {
// return all RFID assignments
AsyncJsonResponse *response = new AsyncJsonResponse(true, 8192);
JsonArray Arr = response->getRoot();
if (listNVSKeys("rfidTags", &Arr, DumpNvsToJSONCallback)) {
response->setLength();
request->send(response);
} else {
request->send(500, "error reading entries from NVS");
}
} else {
if (gPrefsRfid.isKey(tagId.c_str())) {
// return single RFID assignment
AsyncJsonResponse *response = new AsyncJsonResponse(false);
JsonObject obj = response->getRoot();
tagIdToJSON(tagId, obj);
response->setLength();
request->send(response);
} else {
// RFID assignment not found
request->send(404);
}

if ((tagId != "") && gPrefsRfid.isKey(tagId.c_str())) {
// return single RFID entry
String json = tagIdToJsonStr(tagId.c_str(), true);
request->send(200, "application/json", json);
return;
}
// get tag details or just an array of id's
bool idsOnly = request->hasParam("ids-only");

std::vector<String> nvsKeys {};
static size_t nvsIndex;
nvsKeys.clear();
// Dumps all RFID-keys from NVS into key array
listNVSKeys("rfidTags", &nvsKeys, DumpNvsToArrayCallback);
if (nvsKeys.size() == 0) {
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Would not need this special handling for size == 0 if in the chunked response there was no special handling for the first tag.

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Writing the first tag there is no comma in JSON, it is starting with the second entry.
That's is the reason to handle the special case size==0 here and not even start a chunked response.

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Not starting the chunked response in the first place is probably a good idea.

// no entries
request->send(200, "application/json", "[]");
return;
}
// construct chunked repsonse
nvsIndex = 0;
AsyncWebServerResponse *response = request->beginChunkedResponse("application/json",
[nvsKeys = std::move(nvsKeys), idsOnly](uint8_t *buffer, size_t maxLen, size_t index) -> size_t {
maxLen = maxLen >> 1; // some sort of bug with actual size available, reduce the len
size_t len = 0;
String json;

if (nvsIndex == 0) {
// start, write first tag
json = tagIdToJsonStr(nvsKeys[nvsIndex].c_str(), idsOnly);
if (json.length() >= maxLen) {
Log_Println("/rfid: Buffer too small", LOGLEVEL_ERROR);
return len;
}
len += snprintf(((char *) buffer), maxLen - len, "[%s", json.c_str());
nvsIndex++;
}
while (nvsIndex < nvsKeys.size()) {
// write tags as long we have enough room
json = tagIdToJsonStr(nvsKeys[nvsIndex].c_str(), idsOnly);
if ((len + json.length()) >= maxLen) {
break;
}
len += snprintf(((char *) buffer + len), maxLen - len, ",%s", json.c_str());
nvsIndex++;
}
if (nvsIndex == nvsKeys.size()) {
// finish
len += snprintf(((char *) buffer + len), maxLen - len, "]");
nvsIndex++;
}
return len;
});
request->send(response);
}

static void handlePostRFIDRequest(AsyncWebServerRequest *request, JsonVariant &json) {
Expand Down