我有客戶與 API 交互的日志文件。我想解析這些日志并將結果提供給結構映射，以便我可以將數據組織成有用的信息。例如，我想響應以下查詢：“顯示每個用戶每天的請求總數”。我已經創建了一個看起來足夠的結構來保存數據。但是，當我嘗試運行該程序時，出現錯誤：invalid operation: dates[fields[1]] (type *Dates does not support indexing) [process exited with non-zero status].http://play.golang.org/p/8u3jX26kttpackage mainimport ( "fmt" "strings")type Stats struct { totalNumberOfRequests int}type Customer struct { listOfCustomers map[string]Stats // map[customerid]Stats}type Dates struct { listOfDates map[string]Customer // map[date]Customer}var requestLog = []string{ "2011-10-05, 1234, apiquery", "2011-10-06, 1234, apiquery", "2011-10-06, 5678, apiquery", "2011-10-09, 1234, apiquery", "2011-10-12, 1234, apiquery", "2011-10-13, 1234, apiquery",}func main() { dates := new(Dates) for _, entry := range requestLog { fmt.Println("entry:", entry) fields := strings.Split(entry, "'") dates.listOfDates[fields[0]].listOfCustomers[fields[1]].totalNumberOfRequests++ }}有沒有更好的結構可以使用？或者有沒有辦法讓這個結構適合這個特定目的？
1 回答
守著星空守著你
TA貢獻1799條經驗 獲得超8個贊
如果我理解您對輸出的期望，這里有一個解決方案。但是我不喜歡“客戶是一個帶有 id 和 Stat 的地圖......我認為它應該是一個更簡單的結構，有兩個字段（cid string和stat Stats）。而且日期結構不允許在同一日期有多個客戶，所以我已更改為將單個日期映射到用戶列表。
我還添加了更多“測試場景”以涵蓋客戶在同一日期多次訪問資源的情況。
您似乎沒有使用您的示例中的“apiquery”，因此下面的代碼與它不匹配。
關于結構中指針的更改 - 請參閱此問題（如對您的問題的評論所述）
package main
import (
"fmt"
"strings"
)
type Stats struct {
totalNumberOfRequests int
}
type Customer struct {
customerWithStat map[string]*Stats // a customer with it's corresponding stats
}
type Dates struct {
listOfDates map[string][]*Customer // map[date]list of customers (for each date)
}
var requestLog = []string{
"2011-10-05, 1234, apiquery",
"2011-10-06, 5678, apiquery",
"2011-10-06, 1234, apiquery",
"2011-10-06, 1234, apiquery",
"2011-10-06, 5678, apiquery",
"2011-10-06, 1234, apiquery",
"2011-10-09, 1234, apiquery",
"2011-10-12, 1234, apiquery",
"2011-10-13, 1234, apiquery",
"2011-10-13, 1234, apiquery",
"2011-10-06, 1234, apiquery",
}
func main() {
listOfDates := make(map[string][]*Customer)
dates := Dates{listOfDates}
for _, entry := range requestLog {
fields := strings.Split(entry, ",")
curDateStr := strings.TrimSpace(fields[0])
curCustIdStr := strings.TrimSpace(fields[1])
if customersAtDate, dateExists := dates.listOfDates[curDateStr]; dateExists {
// Date already exist
for _, curCustomer := range customersAtDate {
if curStat, customerExists := curCustomer.customerWithStat[curCustIdStr]; customerExists {
// The user has already accessed this resource - just increment
curStat.totalNumberOfRequests++
} else {
// New user - set access to 1
curCustomer.customerWithStat[curCustIdStr] = &Stats{1}
}
}
} else {
// New Date
// Init the Statistic for the new customer
newCustomerData := make(map[string]*Stats)
newCustomerData[curCustIdStr] = &Stats{1}
// Create the customer itself
newCustomer := &Customer{newCustomerData}
// add to the current day list
dates.listOfDates[curDateStr] = append(dates.listOfDates[curDateStr], newCustomer)
}
}
// Print result
for date, customers := range dates.listOfDates {
fmt.Println("Date: ", date)
for _, customer := range customers {
for cid, stat := range customer.customerWithStat {
fmt.Println(" Customer: ", cid)
fmt.Println(" # Requests: ", *stat)
}
}
}
}
這將輸出：
Date: 2011-10-05
Customer: 1234
# Requests: {1}
Date: 2011-10-06
Customer: 5678
# Requests: {2}
Customer: 1234
# Requests: {4}
Date: 2011-10-09
Customer: 1234
# Requests: {1}
Date: 2011-10-12
Customer: 1234
# Requests: {1}
Date: 2011-10-13
Customer: 1234
# Requests: {2}
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