Initial commit of source.

datasource/decode_test.go

@@ -0,0 +1,69 @@
+/*
+Copyright (c) 2015, Hendrik van Wyk
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+this list of conditions and the following disclaimer in the documentation
+and/or other materials provided with the distribution.
+
+* Neither the name of invertergui nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+package datasource
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"reflect"
+	"testing"
+)
+
+var sampleJSON string = `{"outCurrent": 1.19,
+"leds": [0, 0, 0, 0, 1, 0, 0, 1],
+"batVoltage": 26.63,
+"inCurrent": 1.39,
+"outVoltage": 235.3,
+"inVoltage": 235.3,
+"inFreq": 51.3,
+"batCurrent": 0.0,
+"outFreq": 735.3}`
+
+func returnJson(resp http.ResponseWriter, req *http.Request) {
+	resp.Write([]byte(sampleJSON))
+}
+
+func TestFetchStatus(t *testing.T) {
+	//setup test server
+	testServer := httptest.NewServer(http.HandlerFunc(returnJson))
+
+	var status MultiplusStatus
+	source := NewJSONSource(testServer.URL)
+	err := source.GetData(&status)
+	if err != nil {
+		t.Errorf("Unmarshal gave: %v", err)
+	}
+	expected := MultiplusStatus{1.19, 1.39, 235.3, 235.3, 26.63, 0, 51.3, 735.3, []int{0, 0, 0, 0, 1, 0, 0, 1}}
+	if !reflect.DeepEqual(status, expected) {
+		t.Errorf("JSON string did not decode as expected.")
+	}
+	testServer.Close()
+}

datasource/jsondecode.go

@@ -0,0 +1,77 @@
+/*
+Copyright (c) 2015, Hendrik van Wyk
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+this list of conditions and the following disclaimer in the documentation
+and/or other materials provided with the distribution.
+
+* Neither the name of invertergui nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+package datasource
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+type DataSource interface {
+	GetData(*MultiplusStatus) error
+}
+
+type MultiplusStatus struct {
+	OutCurrent float64 `json:"outCurrent"`
+	InCurrent  float64 `json:"inCurrent"`
+	OutVoltage float64 `json:"outVoltage"`
+	InVoltage  float64 `json:"inVoltage"`
+	BatVoltage float64 `json:"batVoltage"`
+	BatCurrent float64 `json:"batCurrent"`
+	InFreq     float64 `json:"inFreq"`
+	OutFreq    float64 `json:"outFreq"`
+	Leds       []int   `json:"leds"`
+}
+
+type source struct {
+	url string
+}
+
+func NewJSONSource(url string) DataSource {
+	return &source{url: url}
+}
+
+func (s *source) GetData(status *MultiplusStatus) error {
+	resp, err := http.Get(s.url)
+	if err != nil {
+		return err
+	}
+	dec := json.NewDecoder(resp.Body)
+	err = dec.Decode(status)
+	if err != nil {
+		return err
+	}
+	err = resp.Body.Close()
+	if err != nil {
+		return err
+	}
+	return nil
+}