From dfbe231a51bea200b45cd84d0c014223c6009fdd Mon Sep 17 00:00:00 2001
From: Luke Swithenbank <lswithenbank@freelancer.com>
Date: Thu, 31 Mar 2016 18:33:28 +1100
Subject: [PATCH] add http_response plugin

---
 plugins/inputs/http_response/README.md        | 36 +++++++
 plugins/inputs/http_response/http_response.go | 95 +++++++++++++++++++
 2 files changed, 131 insertions(+)
 create mode 100644 plugins/inputs/http_response/README.md
 create mode 100644 plugins/inputs/http_response/http_response.go

diff --git a/plugins/inputs/http_response/README.md b/plugins/inputs/http_response/README.md
new file mode 100644
index 000000000..13da76097
--- /dev/null
+++ b/plugins/inputs/http_response/README.md
@@ -0,0 +1,36 @@
+# Example Input Plugin
+
+This input plugin will test HTTP/HTTPS connections.
+
+### Configuration:
+
+```
+# List of UDP/TCP connections you want to check
+[[inputs.http_response]]
+  # Server address (default http://localhost)
+  address = "http://github.com:80"
+  # Set http response timeout (default 1.0)
+  response_timeout = 1.0
+  # HTTP Method (default "GET")
+  method = "GET"
+```
+
+### Measurements & Fields:
+
+- http_response
+    - response_time (float, seconds)
+    - http_response_code (int) #The code received
+
+### Tags:
+
+- All measurements have the following tags:
+    - server
+    - port
+    - protocol
+
+### Example Output:
+
+```
+$ ./telegraf -config telegraf.conf -input-filter http_response -test
+http_response,server=http://192.168.2.2:2000,method=GET response_time=0.18070360500000002,http_response_code=200 1454785464182527094
+```
diff --git a/plugins/inputs/http_response/http_response.go b/plugins/inputs/http_response/http_response.go
new file mode 100644
index 000000000..e19c698a8
--- /dev/null
+++ b/plugins/inputs/http_response/http_response.go
@@ -0,0 +1,95 @@
+package http_response
+
+import (
+	"errors"
+	"net/http"
+	"net/url"
+	"time"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/plugins/inputs"
+)
+
+// HttpResponses struct
+type HttpResponse struct {
+	Address         string
+	Method          string
+	ResponseTimeout int
+}
+
+func (_ *HttpResponse) Description() string {
+	return "HTTP/HTTPS request given an address a method and a timeout"
+}
+
+var sampleConfig = `
+  ## Server address (default http://localhost)
+  address = "http://github.com:80"
+  ## Set response_timeout (default 1 seconds)
+  response_timeout = 1
+  ## HTTP Method
+  method = "GET"
+`
+
+func (_ *HttpResponse) SampleConfig() string {
+	return sampleConfig
+}
+
+func (h *HttpResponse) HttpGather() (map[string]interface{}, error) {
+	// Prepare fields
+	fields := make(map[string]interface{})
+
+	client := &http.Client{
+		Timeout: time.Second * time.Duration(h.ResponseTimeout),
+	}
+	request, err := http.NewRequest(h.Method, h.Address, nil)
+	if err != nil {
+		return nil, err
+	}
+	// Start Timer
+	start := time.Now()
+	resp, err := client.Do(request)
+	if err != nil {
+		return nil, err
+	}
+	fields["response_time"] = time.Since(start).Seconds()
+	fields["http_response_code"] = resp.StatusCode
+	return fields, nil
+}
+
+func (c *HttpResponse) Gather(acc telegraf.Accumulator) error {
+	// Set default values
+	if c.ResponseTimeout < 1 {
+		c.ResponseTimeout = 1
+	}
+	// Check send and expected string
+	if c.Method == "" {
+		c.Method = "GET"
+	}
+	if c.Address == "" {
+		c.Address = "http://localhost"
+	}
+	addr, err := url.Parse(c.Address)
+	if err != nil {
+		return err
+	}
+	if addr.Scheme != "http" && addr.Scheme != "https" {
+		return errors.New("Only http and https are supported")
+	}
+	// Prepare data
+	tags := map[string]string{"server": c.Address, "method": c.Method}
+	var fields map[string]interface{}
+	// Gather data
+	fields, err = c.HttpGather()
+	if err != nil {
+		return err
+	}
+	// Add metrics
+	acc.AddFields("http_response", fields, tags)
+	return nil
+}
+
+func init() {
+	inputs.Add("http_response", func() telegraf.Input {
+		return &HttpResponse{}
+	})
+}