From fd9abd21662a2e019e1f1b08cb8bf276ac2ddad2 Mon Sep 17 00:00:00 2001 From: Boris Yonchev Date: Mon, 17 Jun 2019 23:34:54 +0300 Subject: [PATCH] Add formdata parser (#5749) --- internal/config/config.go | 13 ++ plugins/inputs/http_listener_v2/README.md | 15 +- .../http_listener_v2/http_listener_v2.go | 102 ++++++++--- .../http_listener_v2/http_listener_v2_test.go | 47 +++++ plugins/parsers/formdata/README.md | 76 ++++++++ plugins/parsers/formdata/parser.go | 130 +++++++++++++ plugins/parsers/formdata/parser_test.go | 172 ++++++++++++++++++ plugins/parsers/registry.go | 22 +++ 8 files changed, 551 insertions(+), 26 deletions(-) create mode 100644 plugins/parsers/formdata/README.md create mode 100644 plugins/parsers/formdata/parser.go create mode 100644 plugins/parsers/formdata/parser_test.go diff --git a/internal/config/config.go b/internal/config/config.go index ab50c7df8..0e4c6f23f 100644 --- a/internal/config/config.go +++ b/internal/config/config.go @@ -1726,6 +1726,18 @@ func getParserConfig(name string, tbl *ast.Table) (*parsers.Config, error) { } } + if node, ok := tbl.Fields["form_data_tag_keys"]; ok { + if kv, ok := node.(*ast.KeyValue); ok { + if ary, ok := kv.Value.(*ast.Array); ok { + for _, elem := range ary.Value { + if str, ok := elem.(*ast.String); ok { + c.FormDataTagKeys = append(c.FormDataTagKeys, str.Value) + } + } + } + } + } + c.MetricName = name delete(tbl.Fields, "data_format") @@ -1767,6 +1779,7 @@ func getParserConfig(name string, tbl *ast.Table) (*parsers.Config, error) { delete(tbl.Fields, "csv_timestamp_column") delete(tbl.Fields, "csv_timestamp_format") delete(tbl.Fields, "csv_trim_space") + delete(tbl.Fields, "form_data_tag_keys") return c, nil } diff --git a/plugins/inputs/http_listener_v2/README.md b/plugins/inputs/http_listener_v2/README.md index f5a853189..4829e044d 100644 --- a/plugins/inputs/http_listener_v2/README.md +++ b/plugins/inputs/http_listener_v2/README.md @@ -1,7 +1,7 @@ # HTTP Listener v2 Input Plugin HTTP Listener v2 is a service input plugin that listens for metrics sent via -HTTP. Metrics may be sent in any supported [data format][data_format]. +HTTP. Metrics may be sent in any supported [data format][data_format]. **Note:** The plugin previously known as `http_listener` has been renamed `influxdb_listener`. If you would like Telegraf to act as a proxy/relay for @@ -49,11 +49,17 @@ This is a sample configuration for the plugin. ## more about them here: ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md data_format = "influx" + + ## Part of the request to consume. + ## Available options are "body" and "query". + ## Note that the data source and data format are independent properties. + ## To consume standard query params and POST forms - use "formdata" as a data_format. + # data_source = "body" ``` ### Metrics: -Metrics are created from the request body and are dependant on the value of `data_format`. +Metrics are collected from the part of the request specified by the `data_source` param and are parsed depending on the value of `data_format`. ### Troubleshooting: @@ -67,5 +73,10 @@ curl -i -XPOST 'http://localhost:8080/telegraf' --data-binary 'cpu_load_short,ho curl -i -XPOST 'http://localhost:8080/telegraf' --data-binary '{"value1": 42, "value2": 42}' ``` +**Send query params** +``` +curl -i -XGET 'http://localhost:8080/telegraf?host=server01&value=0.42' +``` + [data_format]: /docs/DATA_FORMATS_INPUT.md [influxdb_listener]: /plugins/inputs/influxdb_listener/README.md diff --git a/plugins/inputs/http_listener_v2/http_listener_v2.go b/plugins/inputs/http_listener_v2/http_listener_v2.go index 3fd8989f9..44581f11b 100644 --- a/plugins/inputs/http_listener_v2/http_listener_v2.go +++ b/plugins/inputs/http_listener_v2/http_listener_v2.go @@ -8,6 +8,8 @@ import ( "log" "net" "net/http" + "net/url" + "strings" "sync" "time" @@ -23,16 +25,25 @@ import ( // 500 MB const defaultMaxBodySize = 500 * 1024 * 1024 +const ( + body = "body" + query = "query" +) + +// TimeFunc provides a timestamp for the metrics type TimeFunc func() time.Time +// HTTPListenerV2 is an input plugin that collects external metrics sent via HTTP type HTTPListenerV2 struct { ServiceAddress string Path string Methods []string - ReadTimeout internal.Duration - WriteTimeout internal.Duration - MaxBodySize internal.Size - Port int + DataSource string + + ReadTimeout internal.Duration + WriteTimeout internal.Duration + MaxBodySize internal.Size + Port int tlsint.ServerConfig @@ -86,6 +97,12 @@ const sampleConfig = ` ## more about them here: ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md data_format = "influx" + + ## Part of the request to consume. + ## Available options are "body" and "query". + ## Note that the data source and data format are independent properties. + ## To consume standard query params and POST forms - use "formdata" as a data_format. + # data_source = "body" ` func (h *HTTPListenerV2) SampleConfig() string { @@ -164,11 +181,13 @@ func (h *HTTPListenerV2) Stop() { } func (h *HTTPListenerV2) ServeHTTP(res http.ResponseWriter, req *http.Request) { - if req.URL.Path == h.Path { - h.AuthenticateIfSet(h.serveWrite, res, req) - } else { - h.AuthenticateIfSet(http.NotFound, res, req) + handler := h.serveWrite + + if req.URL.Path != h.Path { + handler = http.NotFound } + + h.authenticateIfSet(handler, res, req) } func (h *HTTPListenerV2) serveWrite(res http.ResponseWriter, req *http.Request) { @@ -191,23 +210,17 @@ func (h *HTTPListenerV2) serveWrite(res http.ResponseWriter, req *http.Request) return } - // Handle gzip request bodies - body := req.Body - if req.Header.Get("Content-Encoding") == "gzip" { - var err error - body, err = gzip.NewReader(req.Body) - if err != nil { - log.Println("D! " + err.Error()) - badRequest(res) - return - } - defer body.Close() + var bytes []byte + var ok bool + + switch strings.ToLower(h.DataSource) { + case query: + bytes, ok = h.collectQuery(res, req) + default: + bytes, ok = h.collectBody(res, req) } - body = http.MaxBytesReader(res, body, h.MaxBodySize.Size) - bytes, err := ioutil.ReadAll(body) - if err != nil { - tooLarge(res) + if !ok { return } @@ -217,12 +230,52 @@ func (h *HTTPListenerV2) serveWrite(res http.ResponseWriter, req *http.Request) badRequest(res) return } + for _, m := range metrics { h.acc.AddFields(m.Name(), m.Fields(), m.Tags(), m.Time()) } + res.WriteHeader(http.StatusNoContent) } +func (h *HTTPListenerV2) collectBody(res http.ResponseWriter, req *http.Request) ([]byte, bool) { + body := req.Body + + // Handle gzip request bodies + if req.Header.Get("Content-Encoding") == "gzip" { + var err error + body, err = gzip.NewReader(req.Body) + if err != nil { + log.Println("D! " + err.Error()) + badRequest(res) + return nil, false + } + defer body.Close() + } + + body = http.MaxBytesReader(res, body, h.MaxBodySize.Size) + bytes, err := ioutil.ReadAll(body) + if err != nil { + tooLarge(res) + return nil, false + } + + return bytes, true +} + +func (h *HTTPListenerV2) collectQuery(res http.ResponseWriter, req *http.Request) ([]byte, bool) { + rawQuery := req.URL.RawQuery + + query, err := url.QueryUnescape(rawQuery) + if err != nil { + log.Println("D! " + err.Error()) + badRequest(res) + return nil, false + } + + return []byte(query), true +} + func tooLarge(res http.ResponseWriter) { res.Header().Set("Content-Type", "application/json") res.WriteHeader(http.StatusRequestEntityTooLarge) @@ -246,7 +299,7 @@ func badRequest(res http.ResponseWriter) { res.Write([]byte(`{"error":"http: bad request"}`)) } -func (h *HTTPListenerV2) AuthenticateIfSet(handler http.HandlerFunc, res http.ResponseWriter, req *http.Request) { +func (h *HTTPListenerV2) authenticateIfSet(handler http.HandlerFunc, res http.ResponseWriter, req *http.Request) { if h.BasicUsername != "" && h.BasicPassword != "" { reqUsername, reqPassword, ok := req.BasicAuth() if !ok || @@ -269,6 +322,7 @@ func init() { TimeFunc: time.Now, Path: "/telegraf", Methods: []string{"POST", "PUT"}, + DataSource: body, } }) } diff --git a/plugins/inputs/http_listener_v2/http_listener_v2_test.go b/plugins/inputs/http_listener_v2/http_listener_v2_test.go index ab0c89f81..3b647905d 100644 --- a/plugins/inputs/http_listener_v2/http_listener_v2_test.go +++ b/plugins/inputs/http_listener_v2/http_listener_v2_test.go @@ -53,6 +53,7 @@ func newTestHTTPListenerV2() *HTTPListenerV2 { Parser: parser, TimeFunc: time.Now, MaxBodySize: internal.Size{Size: 70000}, + DataSource: "body", } return listener } @@ -377,5 +378,51 @@ func TestWriteHTTPEmpty(t *testing.T) { require.EqualValues(t, 204, resp.StatusCode) } +func TestWriteHTTPQueryParams(t *testing.T) { + parser, _ := parsers.NewFormDataParser("query_measurement", nil, []string{"tagKey"}) + listener := newTestHTTPListenerV2() + listener.DataSource = "query" + listener.Parser = parser + + acc := &testutil.Accumulator{} + require.NoError(t, listener.Start(acc)) + defer listener.Stop() + + resp, err := http.Post(createURL(listener, "http", "/write", "tagKey=tagValue&fieldKey=42"), "", bytes.NewBuffer([]byte(emptyMsg))) + require.NoError(t, err) + resp.Body.Close() + require.EqualValues(t, 204, resp.StatusCode) + + acc.Wait(1) + acc.AssertContainsTaggedFields(t, "query_measurement", + map[string]interface{}{"fieldKey": float64(42)}, + map[string]string{"tagKey": "tagValue"}, + ) +} + +func TestWriteHTTPFormData(t *testing.T) { + parser, _ := parsers.NewFormDataParser("query_measurement", nil, []string{"tagKey"}) + listener := newTestHTTPListenerV2() + listener.Parser = parser + + acc := &testutil.Accumulator{} + require.NoError(t, listener.Start(acc)) + defer listener.Stop() + + resp, err := http.PostForm(createURL(listener, "http", "/write", ""), url.Values{ + "tagKey": {"tagValue"}, + "fieldKey": {"42"}, + }) + require.NoError(t, err) + resp.Body.Close() + require.EqualValues(t, 204, resp.StatusCode) + + acc.Wait(1) + acc.AssertContainsTaggedFields(t, "query_measurement", + map[string]interface{}{"fieldKey": float64(42)}, + map[string]string{"tagKey": "tagValue"}, + ) +} + const hugeMetric = `super_long_metric,foo=bar 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` diff --git a/plugins/parsers/formdata/README.md b/plugins/parsers/formdata/README.md new file mode 100644 index 000000000..4d3c6af31 --- /dev/null +++ b/plugins/parsers/formdata/README.md @@ -0,0 +1,76 @@ +# FormData + +The FormData data format parses a [query string/x-www-form-urlencoded][query_string] data into metric fields. + +Common use case is to pair it with http listener input plugin to parse request body or query params. + +### Configuration + +```toml +[[inputs.http_listener_v2]] + ## Address and port to host HTTP listener on + service_address = ":8080" + + ## Part of the request to consume. + ## Available options are "body" and "query". + ## To consume standard query params or application/x-www-form-urlencoded body, + ## set the data_format option to "formdata". + data_source = "body" + + ## Data format to consume. + ## Each data format has its own unique set of configuration options, read + ## more about them here: + ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md + data_format = "formdata" + + ## Array of key names which should be collected as tags. + ## By default, keys with string value are ignored if not marked as tags. + form_data_tag_keys = ["tag1"] +``` + +### Examples + +#### Basic parsing +Config: +```toml +[[inputs.http_listener_v2]] + service_address = ":8080" + data_source = "query" + data_format = "formdata" + name_override = "mymetric" +``` + +Request: +```bash +curl -i -XGET 'http://localhost:8080/telegraf?field=0.42' +``` + +Output: +``` +mymetric field=0.42 +``` + +#### Tags and key filter + +Config: +```toml +[[inputs.http_listener_v2]] + service_address = ":8080" + data_source = "query" + data_format = "formdata" + name_override = "mymetric" + fielddrop = ["tag2", "field2"] + form_data_tag_keys = ["tag1"] +``` + +Request: +```bash +curl -i -XGET 'http://localhost:8080/telegraf?tag1=foo&tag2=bar&field1=42&field2=69' +``` + +Output: +``` +mymetric,tag1=foo field1=42 +``` + +[query_string]: https://en.wikipedia.org/wiki/Query_string diff --git a/plugins/parsers/formdata/parser.go b/plugins/parsers/formdata/parser.go new file mode 100644 index 000000000..0fc4c572b --- /dev/null +++ b/plugins/parsers/formdata/parser.go @@ -0,0 +1,130 @@ +package formdata + +import ( + "bytes" + "fmt" + "net/url" + "strconv" + "time" + + "github.com/influxdata/telegraf" + "github.com/influxdata/telegraf/metric" +) + +var ( + // ErrNoMetric is returned when no metric is found in input line + ErrNoMetric = fmt.Errorf("no metric in line") +) + +// Parser decodes "application/x-www-form-urlencoded" data into metrics +type Parser struct { + MetricName string + DefaultTags map[string]string + TagKeys []string + AllowedKeys []string +} + +// Parse converts a slice of bytes in "application/x-www-form-urlencoded" format into metrics +func (p Parser) Parse(buf []byte) ([]telegraf.Metric, error) { + buf = bytes.TrimSpace(buf) + if len(buf) == 0 { + return make([]telegraf.Metric, 0), nil + } + + values, err := url.ParseQuery(string(buf)) + + if err != nil { + return nil, err + } + + if len(p.AllowedKeys) > 0 { + values = p.filterAllowedKeys(values) + } + + tags := p.extractTags(values) + fields := p.parseFields(values) + + for key, value := range p.DefaultTags { + tags[key] = value + } + + metric, err := metric.New(p.MetricName, tags, fields, time.Now().UTC()) + + if err != nil { + return nil, err + } + + return []telegraf.Metric{metric}, nil +} + +// ParseLine delegates a single line of text to the Parse function +func (p Parser) ParseLine(line string) (telegraf.Metric, error) { + metrics, err := p.Parse([]byte(line)) + + if err != nil { + return nil, err + } + + if len(metrics) < 1 { + return nil, ErrNoMetric + } + + return metrics[0], nil +} + +// SetDefaultTags sets the default tags for every metric +func (p *Parser) SetDefaultTags(tags map[string]string) { + p.DefaultTags = tags +} + +func (p Parser) filterAllowedKeys(original url.Values) url.Values { + result := make(url.Values) + + for _, key := range p.AllowedKeys { + value, exists := original[key] + + if !exists { + continue + } + + result[key] = value + } + + return result +} + +func (p Parser) extractTags(values url.Values) map[string]string { + tags := make(map[string]string) + for _, key := range p.TagKeys { + value, exists := values[key] + + if !exists || len(key) == 0 { + continue + } + + tags[key] = value[0] + delete(values, key) + } + + return tags +} + +func (p Parser) parseFields(values url.Values) map[string]interface{} { + fields := make(map[string]interface{}) + + for key, value := range values { + if len(key) == 0 || len(value) == 0 { + continue + } + + field, err := strconv.ParseFloat(value[0], 64) + + if err != nil { + continue + } + + fields[key] = field + } + + return fields +} diff --git a/plugins/parsers/formdata/parser_test.go b/plugins/parsers/formdata/parser_test.go new file mode 100644 index 000000000..cd837a057 --- /dev/null +++ b/plugins/parsers/formdata/parser_test.go @@ -0,0 +1,172 @@ +package formdata + +import ( + "testing" + + "github.com/stretchr/testify/require" +) + +const ( + validFormData = "tag1=foo&tag2=bar&tag3=baz&field1=42&field2=69" + encodedFormData = "tag1=%24%24%24&field1=1e%2B3" + notEscapedProperlyFormData = "invalid=%Y5" + blankKeyFormData = "=42&field2=69" + emptyFormData = "" +) + +func TestParseValidFormData(t *testing.T) { + parser := Parser{ + MetricName: "formdata_test", + } + + metrics, err := parser.Parse([]byte(validFormData)) + require.NoError(t, err) + require.Len(t, metrics, 1) + require.Equal(t, "formdata_test", metrics[0].Name()) + require.Equal(t, map[string]string{}, metrics[0].Tags()) + require.Equal(t, map[string]interface{}{ + "field1": float64(42), + "field2": float64(69), + }, metrics[0].Fields()) +} + +func TestParseLineValidFormData(t *testing.T) { + parser := Parser{ + MetricName: "formdata_test", + } + + metric, err := parser.ParseLine(validFormData) + require.NoError(t, err) + require.Equal(t, "formdata_test", metric.Name()) + require.Equal(t, map[string]string{}, metric.Tags()) + require.Equal(t, map[string]interface{}{ + "field1": float64(42), + "field2": float64(69), + }, metric.Fields()) +} + +func TestParseValidFormDataWithTags(t *testing.T) { + parser := Parser{ + MetricName: "formdata_test", + TagKeys: []string{"tag1", "tag2"}, + } + + metrics, err := parser.Parse([]byte(validFormData)) + require.NoError(t, err) + require.Len(t, metrics, 1) + require.Equal(t, "formdata_test", metrics[0].Name()) + require.Equal(t, map[string]string{ + "tag1": "foo", + "tag2": "bar", + }, metrics[0].Tags()) + require.Equal(t, map[string]interface{}{ + "field1": float64(42), + "field2": float64(69), + }, metrics[0].Fields()) +} + +func TestParseValidFormDataDefaultTags(t *testing.T) { + parser := Parser{ + MetricName: "formdata_test", + TagKeys: []string{"tag1", "tag2"}, + DefaultTags: map[string]string{"tag4": "default"}, + } + + metrics, err := parser.Parse([]byte(validFormData)) + require.NoError(t, err) + require.Len(t, metrics, 1) + require.Equal(t, "formdata_test", metrics[0].Name()) + require.Equal(t, map[string]string{ + "tag1": "foo", + "tag2": "bar", + "tag4": "default", + }, metrics[0].Tags()) + require.Equal(t, map[string]interface{}{ + "field1": float64(42), + "field2": float64(69), + }, metrics[0].Fields()) +} + +func TestParseValidFormDataDefaultTagsOverride(t *testing.T) { + parser := Parser{ + MetricName: "formdata_test", + TagKeys: []string{"tag1", "tag2"}, + DefaultTags: map[string]string{"tag1": "default"}, + } + + metrics, err := parser.Parse([]byte(validFormData)) + require.NoError(t, err) + require.Len(t, metrics, 1) + require.Equal(t, "formdata_test", metrics[0].Name()) + require.Equal(t, map[string]string{ + "tag1": "default", + "tag2": "bar", + }, metrics[0].Tags()) + require.Equal(t, map[string]interface{}{ + "field1": float64(42), + "field2": float64(69), + }, metrics[0].Fields()) +} + +func TestParseEncodedFormData(t *testing.T) { + parser := Parser{ + MetricName: "formdata_test", + TagKeys: []string{"tag1"}, + } + + metrics, err := parser.Parse([]byte(encodedFormData)) + require.NoError(t, err) + require.Len(t, metrics, 1) + require.Equal(t, "formdata_test", metrics[0].Name()) + require.Equal(t, map[string]string{ + "tag1": "$$$", + }, metrics[0].Tags()) + require.Equal(t, map[string]interface{}{ + "field1": float64(1000), + }, metrics[0].Fields()) +} + +func TestParseInvalidFormDataError(t *testing.T) { + parser := Parser{ + MetricName: "formdata_test", + } + + metrics, err := parser.Parse([]byte(notEscapedProperlyFormData)) + require.Error(t, err) + require.Len(t, metrics, 0) +} + +func TestParseInvalidFormDataEmptyKey(t *testing.T) { + parser := Parser{ + MetricName: "formdata_test", + } + + // Empty key for field + metrics, err := parser.Parse([]byte(blankKeyFormData)) + require.NoError(t, err) + require.Len(t, metrics, 1) + require.Equal(t, map[string]string{}, metrics[0].Tags()) + require.Equal(t, map[string]interface{}{ + "field2": float64(69), + }, metrics[0].Fields()) + + // Empty key for tag + parser.TagKeys = []string{""} + metrics, err = parser.Parse([]byte(blankKeyFormData)) + require.NoError(t, err) + require.Len(t, metrics, 1) + require.Equal(t, map[string]string{}, metrics[0].Tags()) + require.Equal(t, map[string]interface{}{ + "field2": float64(69), + }, metrics[0].Fields()) +} + +func TestParseInvalidFormDataEmptyString(t *testing.T) { + parser := Parser{ + MetricName: "formdata_test", + } + + metrics, err := parser.Parse([]byte(emptyFormData)) + require.NoError(t, err) + require.Len(t, metrics, 0) +} diff --git a/plugins/parsers/registry.go b/plugins/parsers/registry.go index e6e15469f..3511a99d7 100644 --- a/plugins/parsers/registry.go +++ b/plugins/parsers/registry.go @@ -8,6 +8,7 @@ import ( "github.com/influxdata/telegraf/plugins/parsers/collectd" "github.com/influxdata/telegraf/plugins/parsers/csv" "github.com/influxdata/telegraf/plugins/parsers/dropwizard" + "github.com/influxdata/telegraf/plugins/parsers/formdata" "github.com/influxdata/telegraf/plugins/parsers/graphite" "github.com/influxdata/telegraf/plugins/parsers/grok" "github.com/influxdata/telegraf/plugins/parsers/influx" @@ -141,6 +142,9 @@ type Config struct { CSVTimestampColumn string `toml:"csv_timestamp_column"` CSVTimestampFormat string `toml:"csv_timestamp_format"` CSVTrimSpace bool `toml:"csv_trim_space"` + + // FormData configuration + FormDataTagKeys []string `toml:"form_data_tag_keys"` } // NewParser returns a Parser interface based on the given config. @@ -209,6 +213,12 @@ func NewParser(config *Config) (Parser, error) { config.DefaultTags) case "logfmt": parser, err = NewLogFmtParser(config.MetricName, config.DefaultTags) + case "formdata": + parser, err = NewFormDataParser( + config.MetricName, + config.DefaultTags, + config.FormDataTagKeys, + ) default: err = fmt.Errorf("Invalid data format: %s", config.DataFormat) } @@ -400,3 +410,15 @@ func NewLogFmtParser(metricName string, defaultTags map[string]string) (Parser, func NewWavefrontParser(defaultTags map[string]string) (Parser, error) { return wavefront.NewWavefrontParser(defaultTags), nil } + +func NewFormDataParser( + metricName string, + defaultTags map[string]string, + tagKeys []string, +) (Parser, error) { + return &formdata.Parser{ + MetricName: metricName, + DefaultTags: defaultTags, + TagKeys: tagKeys, + }, nil +}