Merge pull request #1226 from Links2004/httpClient

HTTP client move stream buffer the heap

libraries/ESP8266HTTPClient/examples/ReuseConnection/ReuseConnection.ino

@@ -60,7 +60,6 @@ void loop() {
         }
 
         http.end();
-
     }
 
     delay(1000);

libraries/ESP8266HTTPClient/src/ESP8266HTTPClient.cpp

@@ -30,7 +30,6 @@
 
 #include "ESP8266HTTPClient.h"
 
-
 /**
  * constractor
  */
@@ -335,8 +334,7 @@ int HTTPClient::sendRequest(const char * type, Stream * stream, size_t size) {
         return HTTPC_ERROR_SEND_HEADER_FAILED;
     }
 
-    // create buffer for read
+    size_t buff_size = HTTP_TCP_BUFFER_SIZE;
-    uint8_t buff[1460] = { 0 };
 
     int len = size;
     int bytesWritten = 0;
@@ -345,6 +343,16 @@ int HTTPClient::sendRequest(const char * type, Stream * stream, size_t size) {
         len = -1;
     }
 
+    // if possible create smaller buffer then HTTP_TCP_BUFFER_SIZE
+    if((len > 0) && (len < HTTP_TCP_BUFFER_SIZE)) {
+        buff_size = len;
+    }
+
+    // create buffer for read
+    uint8_t * buff = (uint8_t *) malloc(buff_size);
+
+
+    if(buff) {
         // read all data from stream and send it to server
         while(connected() && stream->available() && (len > 0 || len == -1)) {
 
@@ -352,7 +360,7 @@ int HTTPClient::sendRequest(const char * type, Stream * stream, size_t size) {
             size_t s = stream->available();
 
             if(s) {
-            int c = stream->readBytes(buff, ((s > sizeof(buff)) ? sizeof(buff) : s));
+                int c = stream->readBytes(buff, ((s > buff_size) ? buff_size : s));
 
                 // write it to Stream
                 bytesWritten += _tcp->write((const uint8_t *) buff, c);
@@ -367,6 +375,8 @@ int HTTPClient::sendRequest(const char * type, Stream * stream, size_t size) {
             }
         }
 
+        free(buff);
+
         if(size && (int) size != bytesWritten) {
             DEBUG_HTTPCLIENT("[HTTP-Client][sendRequest] Stream payload bytesWritten %d and size %d mismatch!.\n", bytesWritten, _size);
             DEBUG_HTTPCLIENT("[HTTP-Client][sendRequest] ERROR SEND PAYLOAD FAILED!");
@@ -375,6 +385,11 @@ int HTTPClient::sendRequest(const char * type, Stream * stream, size_t size) {
             DEBUG_HTTPCLIENT("[HTTP-Client][sendRequest] Stream payload written: %d\n", bytesWritten);
         }
 
+    } else {
+        DEBUG_HTTPCLIENT("[HTTP-Client][writeToStream] too less ram! need " HTTP_TCP_BUFFER_SIZE);
+        return HTTPC_ERROR_TOO_LESS_RAM;
+    }
+
     // handle Server Response (Header)
     return handleHeaderResponse();
 }
@@ -434,9 +449,17 @@ int HTTPClient::writeToStream(Stream * stream) {
     int len = _size;
     int bytesWritten = 0;
 
-    // create buffer for read
+    size_t buff_size = HTTP_TCP_BUFFER_SIZE;
-    uint8_t buff[1460] = { 0 };
 
+    // if possible create smaller buffer then HTTP_TCP_BUFFER_SIZE
+    if((len > 0) && (len < HTTP_TCP_BUFFER_SIZE)) {
+        buff_size = len;
+    }
+
+    // create buffer for read
+    uint8_t * buff = (uint8_t *) malloc(buff_size);
+
+    if(buff) {
         // read all data from server
         while(connected() && (len > 0 || len == -1)) {
 
@@ -444,7 +467,7 @@ int HTTPClient::writeToStream(Stream * stream) {
             size_t size = _tcp->available();
 
             if(size) {
-            int c = _tcp->readBytes(buff, ((size > sizeof(buff)) ? sizeof(buff) : size));
+                int c = _tcp->readBytes(buff, ((size > buff_size) ? buff_size : size));
 
                 // write it to Stream
                 bytesWritten += stream->write(buff, c);
@@ -459,12 +482,19 @@ int HTTPClient::writeToStream(Stream * stream) {
             }
         }
 
+        free(buff);
+
         DEBUG_HTTPCLIENT("[HTTP-Client][writeToStream] connection closed or file end (written: %d).\n", bytesWritten);
 
         if(_size && _size != bytesWritten) {
             DEBUG_HTTPCLIENT("[HTTP-Client][writeToStream] bytesWritten %d and size %d mismatch!.\n", bytesWritten, _size);
         }
 
+    } else {
+        DEBUG_HTTPCLIENT("[HTTP-Client][writeToStream] too less ram! need " HTTP_TCP_BUFFER_SIZE);
+        return HTTPC_ERROR_TOO_LESS_RAM;
+    }
+
     end();
     return bytesWritten;
 }
@@ -509,12 +539,13 @@ String HTTPClient::errorToString(int error) {
             return String("no stream");
         case HTTPC_ERROR_NO_HTTP_SERVER:
             return String("no HTTP server");
+        case HTTPC_ERROR_TOO_LESS_RAM:
+            return String("too less ram");
         default:
             return String();
     }
 }
 
-
 /**
  * adds Header to the request
  * @param name

libraries/ESP8266HTTPClient/src/ESP8266HTTPClient.h

@@ -41,6 +41,10 @@
 #define HTTPC_ERROR_CONNECTION_LOST     (-5)
 #define HTTPC_ERROR_NO_STREAM           (-6)
 #define HTTPC_ERROR_NO_HTTP_SERVER      (-7)
+#define HTTPC_ERROR_TOO_LESS_RAM        (-8)
+
+/// size for the stream handling
+#define HTTP_TCP_BUFFER_SIZE (1460)
 
 /// HTTP codes see RFC7231
 typedef enum {